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crown Macro-Tech 2402 Manual

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1. e Patented ODEP Output Device Emulation Protection circuitry compensates for overheating and overload to keep the amplifier working when others would fail e OC Input Output Comparator circuitry immediately alerts of any distortion exceeding 0 05 providing dynamic proof of distortion free performance e PIP Programmable Input Processor connector accepts accessories that tailor the amplifier to suit specific applications e Enhanced PIP2 Programmable Input Processor connector accepts new accessory modules that further tailor the amplifier to suit specific applications including wideband load current moni toring e Two mono modes Bridge Mono and Parallel Mono for driving a wide range of load impedances e Very low harmonic and intermodulation distortion result in the best dynamic transfer function in the industry e High damping factor provides superior control over low frequency drivers for a clean accurate low end Full protection against shorted outputs mismatched loads input output DC general overheating high frequency overloads and internal faults Dedicated power supply transformers isolate channels in Stereo mode for superb crosstalk characteristics and reli ability each channel is virtually a sepa rate amplifier Balanced inputs with internal three posi tion sensitivity switch and adjustable front panel level controls Full protection from shorted open and mismatched loads gen
2. CrOULRTI Operation Manual Macro Tech 2402 Crown Y 22 mACFO TECH 2402 a s 4 P Obtaining Other Language Versions To obtain information in another language about the use of this product please contact your local Crown Distributor If you need assistance locating your local distributor please contact Crown at 574 294 8000 This manual does not include all of the details of design production or variations of the equipment Nor does it cover every possible situation which may arise during installation operation or maintenance The information provided in this manual was deemed accurate as of the publication date However updates to this information may have occurred To obtain the latest version of this manual please visit the Crown website at www crownaudio com Trademark Notice Crown Crown Audio Amcron Macro Tech and ODEP are registered trademarks of Crown International PIP and Grounded Bridge are trademarks of Crown International Other trademarks are the property of their respective owners Some models may be exported under the name Amcron 92007 by Crown Audio Inc 1718 W Mishawaka Rd Elkhart Indiana 46517 9439 U S A Telephone 574 294 8000 H A Harman International Company 127240 9 12 07 CrTOUJN Important Safety Instructions Importantes Instructions de S curit page 2 17 Read these instructions Keep these instructions Heed all warnings Follow all inst
3. ODEP Figure 7 1 Circuit Block Diagram MA 2402 Power Amplifier output stage of Channel 2 The Channel 2 balanced input error amp translators and LVAs are discon nected and no longer control the Channel 2 output stage Disconnecting the front end stages from the Channel 2 output causes the Channel 2 10C circuit to note that the input waveform which is not present does not match the output waveform which is driven by the Channel 1 input signal This activates the Channel 2 IOC indicator any time the amplifier is switched to Parallel Mono The Channel 2 output stage and protection mechanisms are also coupled through S1 and function as one In Parallel Mono mode twice the current of one channel alone can be obtained Because the Chan nel 2 ODEP circuit is coupled through S1 this gives added protection if a fault occurs in the Channel 2 output stage The ODEP circuit of Channel 2 will limit the output of both output stages by removing the drive from the Channel 1 translator stages ENABLE POWER TIMER SUPPLY CONTROL DC LF FAULT Operation Manual MA 2402 Power Amplifier 8 Specifications Operation Manual Minimum Guaranteed Power Macro Tech 2402 120 VAC 60 Hz Units Stereo mode per channel both channels driven 1 kHz with 0 1 THD Stereo 2 ohms per ch 1 050 W Stereo 4 ohms per ch 800 W Stereo 8 ohms per ch 520 W 120 VAC 60 Hz Units Bridge mono mode 1 kHz with 0 1 THD 4 ohms 2 07
4. fully counterclock wise and turn off the amplifier before wiring it as described below 3 6 1 Stereo Mode See Figure 3 6 Set the back panel stereo mono switch to Stereo INPUTS Connect input wiring to both channels OUTPUTS Maintain proper polarity on output connectors Connect Channel 1 positive speaker load to Channel 1 positive terminal of amp repeat for nega tive Repeat Channel 2 wiring as for Channel 1 3 6 2 Bridge Mono Mode See Figure 3 7 Set the back panel stereo mono switch to Bridge Mono INPUTS Connect input wiring to Channel 1 only OUTPUTS Connect the speaker across the positive terminals of each channel Do not use the nega tive terminals when the amp is being oper ated in Bridge Mono mode NOTE The Channel 2 Level control should be set fully counter clockwise when operat ing the amplifier in Bridge Mono mode CAUTION Be certain all equipment meters switches etc connected to the mono out put is balanced To prevent oscillations both sides of the line must be isolated from the input grounds page 8 Figure 3 6 Stereo Wiring Figure 3 7 Bridge Mono Wiring A MA 2402 Power Amplifier CHANNEL 2 LOUDSPEAKER oy nus CE CHANNEL 1 CHANNEL 2 MIXER CHANNEL 1 LOUDSPEAKER ou E Macro Tech Amplifier STEREO PARALLEL BRIDGE MONO mono STEREO MODE CAUTION TURN OFF AMPLIFIER BEFORE CHANGING THIS SWITCH _ ONL
5. is not identified here because it is TORS ap we identical to the FTC Continuous Average Power 800 750 785 770 specification 260 309 AL 205 1 A 1 kHz sine wave is presented to the ampli 1670 2030 fier and the output monitored for nonlinear dis 148 156 i tortion The level is increased until the THD a 308 ate reaches 0 1 At this level the average power 1000 1020 1005 per channel is reported 2050 2 sine wave is presented to the amplifier over 1590 1470 the range from 20 Hz to 20 kHz and the output 1025 1005 monitored for nonlinear distortion The level at each frequency is increased until the THD 875 reaches 0 1 At this level the average power 715 735 690 per channel is reported 500 510 505 3 A 1 KHz sine wave is presented to the ampli 1735 fier and the output monitored for nonlinear dis tortion The level is increased until the THD 1420 1475 1395 reaches 0 05 At this level the average power 1000 1020 1010 per channel is reported 1750 4 Continuous power in the context of Federal Trade Commission testing is understood to be a Parallel Mono nee ae minimum of five minutes of operation Harmonic 1010 1000 distortion is measured as the RMS sum total and given as a percentage of the fundamental output voltage This applies for all wattages greater than Figure 8 2 Macro Tech 2402 Minimum Power Matrix 0 25 watts Macro Tech 2402 Minimum Guaranteed Power Watts Stereo Mono Mode Stereo both channels driven B
6. per ch 800W 750W 8 ohm Dual per ch 520W 505W 4 ohm Bridge Mono 2 070W 1 670W 8 ohm Bridge Mono 1 585W 1 485W 1 kHz Power refers to maximum average power in watts at 1 kHz with 0 1 THD 20 Hz 20 kHz Power refers to maximum average power in watts from 20 Hz to 20 kHz with 0 1 THD Operation Manual CrOUN MACTO TECH 2402 LEVEL 1 18 12 ifs 18 21 ODEP 9 4 21 Oj 4 E Y 2 SIGNAL IOc O 2 a Dorr 27 3 27 30 CH1 CH2 0 30 ENABLE 1 Welcome Congratulations on purchasing the renowned Crown Macro Tech 2402 power amplifier It is designed to provide enormous levels of pure undistorted power in a rugged low profile package making it the choice for pro sound reinforcement It utilizes our patented ODEP protection circuitry to keep the show going long after other amplifiers have shut down And with its P P expandability the amplifier can be easily customized with one of our many optional input modules see Section 5 for a list of available PIPs Modern power amplifiers are sophisticated pieces of engineering capable of producing extremely high power levels They must be treated with respect and correctly installed if they are to provide the many years of reliable service for which they were designed In addition the Macro Tech 2402 amplifier includes a number of features which require some explanation before it can be used to its maximum advantage Please take the time to study t
7. D ALIMEN TATION RESTERA AIS MENT FONCTIONNELLE PARA DESCONECTAR COMPLETAMENTE EL EQUIPO DEL SUMINSTRO ELECTRICO DESCONECTE EL CABLE DE ALI MENTACION DE LA TOMA DE CA LAS PATAS DEL CONEC TOR DEL CABLE DE ALIMENTACION DEBERAN MANTENERSE EN BUEN ESTADO WATCH FOR THESE SYMBOLS The lightning bolt triangle is used to alert the user to the risk of electric shock The exclamation point triangle is used to alert the user to important operating or maintenance instructions REGARDEZ CES SYMBOLES La triangle avec le sigle foudre est employ e pour alerter l utilisateur au risque de d charge lectrique Le triangle avec un point d exclamation est employ e pour alerter l utilisateur d instruction importantes pour lors op rations de mainte nance ATENCION CON ESTOS S MBOLOS El tri ngulo con el s mbolo de rayo el ctrico es usado para alertar al usuario de el riesgo de un choque el ctrico El tri ngulo con el signo de admiraci n es usado para alertar al usuario de instrucciones importantes de operaci n o man tenimiento gt gt gt gt gt gt IMPORTANT The MA 2402 amplifier requires Glass 1 output wiring Lamplificateur de MA 2402 exige des c bles de sortie de classe 1 Der MA 2402 Verstarker erfordert Klasse die 1 Produktionsver A CAUTION drahtung RISK OF ELECTRIC SHOCK a ae de MA 2402 requiere de un cableado de salida DO NOT OPEN MAGNETIC FIELD AVIS RISQUE
8. The foam in place packing is molded so that there is only one correct position for your product 1 Open carton and lift center cushion leaving both end cushions in place CrTOUJN 2 Carefully place your product with the product s front panel facing the same direction as arrows indicate 3 Reset center cushion down over top of product s chassis The foam in place packing was molded to accommodate different chassis depth sizes If your product s chassis does not completely fill the foam in place cavity you may use a soft but solid packing material such as paper or bubble wrap behind the chassis 4 Enclose the completed Crown Audio Factory Service Information form or securely attach it to the outside of carton and re seal the shipping pack with a sturdy carton sealing tape 10 2 5 Estimate Approval Approval of estimate must be given within 30 days after being notified by Crown Audio Inc Units still in the pos session of Crown after 30 days of the estimate will become the property of Crown Audio Inc 10 2 6 Payment of Non Warranty Repairs Payment on out of warranty repairs must be received within 30 days of the repair date Units unclaimed after 30 days become the property of Crown Audio Inc If you have any questions please contact Crown Factory Service Crown Factory Service 1718 W Mishawaka Rd Elkhart Indiana 46517 U S A Telephone 574 294 8200 800 342 6939 North America Puerto Rico and Virgin Isla
9. make sure you read and observe the Important Safety Instructions at the beginning of this manual 3 2 Install Your Amplifier CAUTION Before you begin make sure your amplifier is disconnected from the power source with power switch in the off posi tion and all level controls turned completely down counterclockwise Use a standard 19 inch 48 3 cm equipment rack see Figure 3 1 for amplifier dimensions You may also stack amps without using a cabinet NOTE When transporting amplifiers should be supported at both front and back Crown MACFO TECH 2402 SIDE VIEW HAAG A Le 16 in 2 5 in 40 6 cm 6 35 cm Figure 3 1 Dimensions MA 2402 Power Amplifier 3 3 Ensure Proper Cooling When using an equipment rack mount units directly on top of each other Close any open spaces in rack with blank panels DO NOT block front or rear air vents The side walls of the rack should be a minimum of 2 inches 5 1 cm away from the ampli fier sides and the back of the rack should be a min imum of 4 inches 10 2 cm from the amplifier back panel Figure 3 2 illustrates standard amplifier airflow Figure 3 2 Airflow Operation Manual MA 2402 Power Amplifier 3 Setup A Operation Manual 3 4 Choose Input Wire and Connectors Crown recommends using pre built or profes sionally wired balanced line two conductor plus shield 22 24 g
10. refer to the block diagram in Figure 7 1 The input signal at the phone jack passes directly into the balanced gain stage U104 C and U104 D When the PIP module is used the input signal first passes through the PIP s circuitry and then to the balanced gain stage The balanced gain stage U104 C and U104 D causes balanced to single ended conversion using a difference amplifier From there gain can be controlled with a potentiometer The error amp U104 A amplifies the difference between the output signal and the input signal from the gain pot and drives the voltage trans lator stage From the error amp U104 A the voltage trans lator stage channels the signal to the Last Volt age Amplifiers LVAs depending on the signal polarity The LVA Q104 and Q105 and the LVA Q110 and Q111 with their push pull effect through the bias servo Q318 drive the fully complementary output stage The bias servo Q318 is thermally coupled to the heat sink and sets the quiescent bias cur rent in the output stage to lower the distortion in the crossover region of the output signal Depending on the polarity of the output signal D301 D302 D303 and D304 are used to remove the charge on the unused portion of the output stage With the voltage swing provided by the LVAs the signal then gains current amplification through the Darlington emitter follower output Stage page 19 CrTOUJMN 7 Theory of Operation The bridge balanced c
11. we are unable to pro vide replacement and repair is not practical or cannot be timely made If a refund is elected then you must make the defective or malfunctioning product available to us free and clear of all liens or other encumbrances The refund will be equal UNITED STATES amp CANADA to the actual purchase price not including inter est insurance closing costs and other finance charges less a reasonable depreciation on the product from the date of original purchase War ranty work can only be performed at our autho rized service centers or at the factory Warranty work for some products can only be performed at our factory We will remedy the defect and ship the product from the service center or our factory within a reasonable time after receipt of the defec tive product at our authorized service center or our factory All expenses in remedying the defect including surface shipping costs in the United States will be borne by us You must bear the expense of shipping the product between any for eign country and the port of entry in the United states including the return shipment and all taxes duties and other customs fees for such for eign shipments HOW TO OBTAIN WARRANTY SERVICE You must notify us of your need for warranty ser vice within the warranty period All components must be shipped in a factory pack which if needed may be obtained from us free of charge Corrective action will be taken within a
12. you for the information when your unit is repaired Credit card information Type of credit card O Master Card O Visa Q American Express Q Discover Type of credit card account L Personal Consumer A Business Corporate Card EX ates Card ID SSS o Card ID is located on the back of the card following the credit card in the signature area On American Express it may be located on the front of the card This number is required to process the charge to your account If you do not want to provide it at this time we will call you to obtain this number when the repair of your unit is complete Name on credit card Operation Manual page 33 CTOUJN MA 2402 Power Amplifier THIS PAGE INTENTIONALLY LEFT BLANK page 34 Operation Manual MA 2402 Power Amplifier CrTOUJN THIS PAGE INTENTIONALLY LEFT BLANK Operation Manual page 35 Cro uri H A Harman International Company
13. 0 W 8 ohms 1 585 W 16 ohms 1 035 W 120 VAC 60 Hz Units Parallel mono mode 1 kHz with 0 1 THD 1 ohm 2 080 W 2 ohms 1 605 W 4 ohms 1 035 W Performance Macro Tech 2402 Frequency Response at 1 watt 20 Hz 20 kHz 0 1 dB Phase Response at 1 watt 10 Hz 20 kHz 10 Signal to Noise Ratio below rated full bandwidth power 20 Hz to 20 kHz gt 100 dB A weighted gt 105 dB Total Harmonic Distortion THD at rated power from 20 Hz to 1 kHz lt 0 05 Total Harmonic Distortion THD at rated power at 20 kHz 0 1 Intermodulation Distortion IMD 60 Hz and 7 kHz at 4 1 lt 0 05 from 163 milliwatts to full bandwidth power Damping Factor 10 Hz to 400 Hz gt 1000 Crosstalk below rated power 20 Hz to 1 kHz gt 85 dB Controlled Slew Rate gt 13 volts microsecond Input Impedance nominal balanced unbalanced 20 k ohms 10 k ohms crown page 21 crown 8 Specifications page 22 MA 2402 Power Amplifier Performance continued Macro Tech 2402 Load Impedance Note Safe with all types of loads stereo Bridge Mono F 4 16 ohms Parallel Mono 1 4 ohms Voltage Gain at maximum level setting 6 0 775V sensitivity 38 dB 0 5 dB 1 4V sensitivity 33 dB 0 5 dB 26 dB gain 26 dB Required AC Mains 50 60 Hz 100 240VAC 10 15 Power Draw at Idle 100 watts or less Ventilation Flow through ventilation from front to side panels Cooling Internal h
14. C indicator will remain lit when operating in Parallel Mono mode page 9 CrTOUJN 3 Setup 3 7 Set Input Sensitivity The input sensitivity switch inside the amplifier is set to 0 775 volt RMS at the factory Factory setting for international models is 1 4V It can be changed to 1 4 volts or a voltage gain of 26 dB The 26 dB gain setting is equivalent to a sensitivity of 3 1 volts for the Macro Tech 2402 To change the input sensitivity 1 Turn off and unplug the amplifier from the AC source 2 Remove the input module on the back panel 3 Locate the labeled access hole for the sensitivity switch Figure 3 9 The sensitivity switch will not be visible because it is mounted below the hole Use your little finger to reach it 4 Set the switch to the desired position 5 Replace the input module SENSITIVITY SWITCH INSIDE ACCESS HOLE 1 4V 26 dB 0 77 V Figure 3 9 Input Sensitivity Switch page 10 3 8 Connect to AC Mains Connect your amplifier s power cord to the AC mains power source power outlet WARNING The third prong of this connector ground is an important safety feature Do not attempt to disable this ground connec tion by using an adapter or other methods Amplifiers don t create energy The AC mains volt age and current must be sufficient to deliver the power you expect You must operate your amplifier from an AC mains power source with not more than 10 variation above or below the
15. DE CHOC LECTRIQUE N OUVREZ PAS CAUTION Do not locate sensitive high gain equipment such as preamplifiers or tape decks directly above or below the unit Because this amplifier has a high power density it has a strong magnetic field which can induce hum into unshielded devices that are located nearby The field is strongest just above and below the unit If an equipment rack is used we recommend locating the ampli fier s in the bottom of the rack and the preamplifier or other sensi tive equipment at the top FCC COMPLIANCE NOTICE This device complies with part 15 of the FCC rules Operation is subject to the following two conditions 1 This device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired Operation CAUTION Changes or modifications not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment NOTE This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications However there is no guara
16. ECTRIC SHOCK DO NOW EXPOSE THIS EUIPMENT PARALLEL MONO TO RAIN OR MOISTURE L N L K Figure 4 2 Rear Panel Controls amp Connectors 3 ADD JUMPER 14 A GAGE OR LARGER ACROSS RED TERMINALS OUTPUT ACROSS CH 1 00 TERMINALS ONLY Operation Manual MA 2402 Power Amplifier 4 Operation Operation Manual 4 4 Indicators The amber Enable indicator is provided to show that the amplifier has been turned on or enabled and that its low voltage power supply and forced air cooling system are working It does not indicate the status of the high voltage power supplies For example the Enable indi cator will remain lit during unusual conditions that would cause the amplifier s protection sys tems to put a high voltage power supply in standby mode see Section 5 1 2 The amber ODEP indicators confirm the nor mal operation of Crown s patented Output Device Emulation Protection circuitry During normal operation they glow brightly to show the presence of reserve thermal dynamic energy They dim proportionally as the energy reserve decreases In the rare event that there is no reserve the indicators turn off and ODEP proportionally limits the drive level of the out put stages so the amplifier can continue safe operation even when conditions are severe For a more detailed description of ODEP see section 5 1 1 0 30 CH1 ODEP SIGNAL IOC The ODEP indicator for the affected channel will turn o
17. IP units featur ing an edge connector first attach the ampli fier s ribbon cables to the PIP2 adapter as in Figure 5 1 Then carefully slide the PIP card edge into the adapter s edge connector Figure 5 2 Finally insert the combined units into the amplifier and screw securely into place Figure 5 2 MA 2402 Power Amplifier E im LLL A 18 PIN B 20 PIN A Figure 5 1 PIP2 Adapter Connection BA OF PIP2 AMPLIFIER pip2 ADAPTER Figure 5 2 Installing a PIP Module Operation Manual MA 2402 Power Amplifier CTOUJN 5 Advanced Features and Options For PIP2s featuring ribbon cable connectors simply locate the two connectors on the under Ae NON O sh side of the PIP circuit board then connect the 2 ki two input ribbon cables coming from the ampli fier see Figure 5 3 Both ribbon cables should run smoothly from the amplifier to the PIP card Insert the PIP and attached cables into the PIP opening in the back of the amplifier then screw securely into place WARNING Disconnect power to the A amplifier when installing or removing a PIP module 5 3 2 Cooling Fan Options Every Macro Tech amplifier has a built in high velocity fan that provides optimum cooling Two optional replacement fan blades are available for special cooling requirements Crown part C 6594 3 is a quieter low velocity fan blade that in many cases can provide adequate cooling Crown part C 6593 5 is a reverse air flow fan blade whic
18. NADA WHAT THE WARRANTOR WILL DO We will remedy any defect regardless of the rea son for failure except as excluded by repair replacement or refund We may not elect refund unless you agree or unless we are unable to pro vide replacement and repair is not practical or cannot be timely made If a refund is elected then you must make the defective or malfunctioning product available to us free and clear of all liens or other encumbrances The refund will be equal to the actual purchase price not including inter est insurance closing costs and other finance charges less a reasonable depreciation on the product from the date of original purchase War ranty work can only be performed at our autho rized service centers We will remedy the defect and ship the product from the service center within a reasonable time after receipt of the defec tive product at our authorized service center HOW TO OBTAIN WARRANTY SERVICE You must notify your local Crown importer of your need for warranty service within the warranty period All components must be shipped in the original box Corrective action will be taken within a reasonable time of the date of receipt of the defective product by our authorized service center If the repairs made by our authorized service cen ter are not satisfactory notify our authorized ser vice center immediately DISCLAIMER OF CONSEQUENTIAL AND INCIDENTAL DAMAGES YOU ARE NOT ENTITLED TO RECOVER FROM U
19. S ANY INCIDENTAL DAMAGES RESULTING FROM ANY DEFECT IN THE NEW CROWN PRODUCT THIS INCLUDES ANY DAMAGE TO ANOTHER PRODUCT OR PRODUCTS RESULTING FROM SUCH A DEFECT WARRANTY ALTERATIONS No person has the authority to enlarge amend or modify this Crown Warranty This Crown Warranty is not extended by the length of time which you are deprived of the use of the new Crown product Repairs and replacement parts provided under the terms of this Crown Warranty shall carry only the unexpired portion of this Crown Warranty DESIGN CHANGES We reserve the right to change the design of any product from time to time without notice and with no obligation to make corresponding changes in products previously manufactured LEGAL REMEDIES OF PURCHASER No action to enforce this Crown Warranty shall be commenced after expiration of the warranty period THIS STATEMENT OF WARRANTY SUPERSEDES ANY OTHERS CONTAINED IN THIS MANUAL FOR CROWN PRODUCTS 9 07 crown page 29 CTOUJN MA 2402 Power Amplifier NOTES page 30 Operation Manual MA 2402 Power Amplifier CUT ON THIS LINE Operation Manual PRODUCT REGISTRATION Crown Audio Inc A Elkhart IN 46517 9439 Phone 574 294 8000 CTOUJI Fax 574 294 8329 www crownaudio com Online registration is also available at http crownweb crownintl com webregistration Warranty is only valid within the country in which the product is purchased When this form is used to register your
20. Y USE THE CHANNEL 1 INPUTS 2 ih MIXER LOUDSPEAKER OJO DO NOT OUTPUTS USE BLACK BINDING POSTS STEREO Macro Tech Amplifier STEREO PARALLEL BRIDGE MONO MONO CAUTION TURN OFF AMPLIFIER BEFORE CHANGING THIS SWITCH Operation Manual MA 2402 Power Amplifier 3 Setup ONLY USE THE CHANNEL 1 INPUTS ADD A 14 GAUGE OR LARGER JUMPER BETWEEN THE CHANNEL 1 AND 2 RED BINDING POSTS MIXER LOUDSPEAKER Figure 3 8 Parallel Mono Wiring Macro Tech Amplifier STEREO PARALLEL BRIDGE MONO MONO CAUTION TURN OFF AMPLIFIER BEFORE CHANGING THIS SWITCH PARALLEL MONO MODE Operation Manual CrTOUJN 3 6 3 Parallel Mono Mode See Figure 3 8 Set the back panel stereo mono switch to Parallel Mono INPUTS Connect input wiring to Channel 1 only OUTPUTS Add a 14 gauge or larger jumper between the red Channel 1 and Channel 2 binding posts Connect the speaker positive lead to the Channel 1 red terminal Connect the speaker negative lead to the Channel 1 black terminal Crown provides a reference of wiring pin assign ments for commonly used connector types in the Crown Amplifier Application Guide NOTE Use only the Channel 1 level control CAUTION Parallel Mono wiring requires installation of a jumper wire Do not switch to Stereo or Bridge Mono mode until this output jumper wire is removed NOTE The Channel 2 IO
21. al information on the operating temperature of the heat sink on which the output devices are mounted should the amplifier fail in such a way that would cause DC across the output leads the DC protection circuit senses this on the negative feedback loop and shuts down the power supply until the DC is removed 7 2 2 Bridge Mono Operation By setting the back panel stereo mono switch to Bridge Mono the user can convert the Macro Tech into a bridged single channel amplifier With a sig O Vcc TRANSLATOR LVA ERROR TRANSLATOR nal applied to the Channel 1 input jack and the load connected across the red back panel 5 way binding posts twice the voltage can be output The Channel 1 output feeds the Channel 2 error amp U204 A Because there is a net inversion the channel 2 output is out of polarity with Channel 1 This produces twice as much voltage across the load Each of the channel s protection mechanisms work independently if a fault occurs 7 2 3 Parallel Mono Operation With the stereo mono switch set to Parallel Mono the output of Channel 2 is paralleled with the output of Channel 1 A suitable jumper capable of handling high current levels must be connected across the red 5 way binding posts to gain the benefits of this mode of operation The signal path for Channel 1 is the same as previ ously discussed except Channel 1 also drives the NPN LOW OUTPUT STAGE PNP LOW OUTPUT STAGE B
22. amplifier s speci fied line voltage and within the specified frequency requirements indicated on the amplifier s back panel label If you are unsure of the output voltage of your AC mains please consult your electrician 3 9 Startup Procedure Use the following procedure when first turning on your amplifier 1 Turn down the level of your audio source 2 Turn down the Level controls of the amplifier 3 Turn on the Power switch The Enable indicator next to the Power switch should glow The amber ODEP lights should also be glowing 4 Turn up the level of your audio source to an opti mum level 5 Turn up the Level controls on the amplifier until the desired loudness or power level is achieved 6 Turn down the level of your audio source to its normal range If you ever need to make any wiring or installation changes don t forget to disconnect the power cord For help with determining your system s optimum gain structure signal levels please refer to the Crown Amplifier Application Guide available online at www crownaudio com MA 2402 Power Amplifier 4 Operation 4 1 Precautions Your amplifier is protected from internal and exter nal faults but you should still take the following precautions for optimum performance and safety 1 Before use configure your amplifier for proper Operation as described in the Setup section of this manual Improper wiring can result in seri ous operating difficulties For advanc
23. ansients The four quadrant topology used in a Macro Tech s grounded output stages is called the Grounded Bridge This patented topology makes full use of the power supplies providing peak to peak voltages to the load that are twice the voltage seen by the output devices see Fig ure 7 1 As its name suggests the Grounded Bridge topology is referenced to ground Composite devices are constructed to function as gigantic NPN and PNP devices to handle currents which exceed the limits of available devices Each output stage has two composite NPN devices and two composite PNP devices The devices connected to the load are referred to as high side NPN and PNP and the devices connected to ground are referred to as low side NPN and PNP Positive current is deliv ered to the load by increasing conductance simultaneously in the high side NPN and low side PNP stage while synchronously decreas ing conductance of the high side PNP and low side NPN The two channels may be used together to dou ble the voltage Bridge Mono or the current Parallel Mono presented to the load This fea ture gives you flexibility to maximize the power available to the load A wide bandwidth multiloop design is used for State of the art compensation This produces ideal behavior and results in ultra low distor tion values Aluminum extrusions have been widely used for heat sinks in power amplifiers due to their low cost and reasonable performanc
24. auge cables and connec tors The factory installed PIP2 FXQ input mod ule accepts 3 pin male XLR connectors or TRS phone connectors Other PIP modules accept XLR phone or Phoenix connectors or bare wires Regarding the PIP2 FXQ Figure 3 3 shows con nector pin assignments for balanced wiring and Figure 3 4 shows connector pin assignments for unbalanced wiring NOTE Custom wiring should only be per formed by qualified personnel 3 5 Choose Output Wire and Con nectors Crown recommends using pre built or profes sionally wired high quality two conductor heavy gauge speaker wire Use bare wire a dual banana plug or spade lugs on the amplifier end of each speaker cable Figure 3 5 To prevent the possibility of short circuits wrap or other wise insulate exposed loudspeaker cable con nectors Using the guidelines below select the appropri ate size of wire based on the distance from amplifier to speaker Distance Wire Size up to 25 ft 16 gauge 26 40 ft 14 gauge 41 60 ft 12 gauge 61 100 ft 10 gauge 101 150 ft 8 gauge 151 250 ft 6 gauge CAUTION Never use shielded cable for output wiring BALANCED UNBALANCED SHIELD SHIELD Figure 3 3 Balanced Input Connector Wiring Figure 3 4 Unbalanced Input Connector Wiring OUTPUTS CH 2 CH 1 Figure 3 5 Output Connector Wiring crown page 7 crown 3 Setup 3 6 Wire Your System Turn down the Level controls
25. e However measured on a watts per pound or watts per volume basis the extrusion technology doesn t perform nearly as well as the heat sink technol ogy developed for Macro Tech amplifiers Our heat sinks are fabricated from custom con voluted fin stock that provides an extremely high ratio of area to volume or area to weight All power devices are mounted directly to mas sive heat spreaders that are electrically at the Vcc potential Electrifying the heat spreaders improves thermal performance by eliminating the insulating interface underneath the power devices The chassis itself is even used as part of the thermal circuit to maximize utilization of the available cooling resources 7 2 Circuit Theory Each channel is powered by its own power transformer 1100 or T200 Both channels share a common low voltage transformer TF 1 The secondary output of 1100 is full wave rectified by D109 and is filtered by a large computer grade capacitor D104 through D107 provide boosted voltage to power LVAs and predrivers CrTOUJN A thermal switch embedded in each transformer protects it from overheating The low voltage transformer output is rectified by diodes D1 D2 D3 and D4 to generate an unregulated 24 volts Monolithic regulators U1 and U2 provide a regulated 15 volts 7 2 1 Stereo Operation For simplicity the discussion of Stereo opera tion will refer to one channel only Mono opera tion will be discussed later Please
26. e Channel 2 input should NOT be used in either Bridge Mono or Parallel Mono mode OUTPUTS CLASS 1 MA 2402 Power Amplifier L Balanced XLR Inputs The factory installed PIP2 FXQ provides a three pin female XLR connector for balanced input to each chan nel The XLR inputs are connected in parallel with the amplifiers phone jack inputs Because the PIP2 FXQ does not have any active circuitry its XLR connectors can also be used as daisy chain outputs to connect sig nals from phone jack inputs to multiple amplifiers Cau tion The Channel 2 input should NOT be used in either Bridge Mono or Parallel Mono mode M Output Jacks A pair of versatile 5 way binding posts is provided for the output of each channel The 5 way binding posts accept banana plugs spade lugs or bare wire European models do not accept banana plugs N Input Ground Lift Switch The input ground lift switch is located on the PIP2 FXQ It is used to isolate the input signal grounds from the AC chassis ground to help prevent ground loops that can result in unwanted hum and noise see the Crown Ampli fier Application Guide for more information about pre venting ground loops BRIDGE MONO WIRING A A OD TURN AMPLIFIER OFF E SET STEREO MONO SWITCH TO BRIDGE MONO OUTPUT ACROSS RED TERMINALS ONLY CH 1 IS POSITIVE PARALLEL MONO WIRING O TURN AMPLIFIER OFF SET STEREO MONO WARNING To RED CE THE RISK OF FIRE OR SWITCH TO EL
27. eat sinks with forced air cooling for rapid uniform heat dissipation Dimensions Width EIA Standard 19 inch 48 3 cm rack mount EIA RS 310 B Height 3 5 inches 8 9 cm Depth 16 inches 40 6 cm Weight Net Weight 51 Ib 12 oz 23 5 kg Shipping Weight 65 Ib 29 5 kg Operation Manual MA 2402 Power Amplifier 8 Specifications N lt gt N I oOo o lt gt Wl q International Units Stereo Mono Mode Stereo both channels driven Bridge Mono balanced output Parallel Mono Stereo both channels driven Bridge Mono balanced output Parallel Mono Operation Manual Macro Tech 2402 Maximum Power Watts Single Cycle Tone Burst At less than 0 05 THD See note TM 40 Millisecond Tone Burst At 0 05 THD RTE note 2 1675 1250 ES 1310 1270 710 510 3380 3380 2465 2175 2610 2550 1775 1590 1420 1375 1085 3145 3045 2510 1025 2145 2605 2505 1695 1580 1410 1365 1125 1020 1655 1680 1340 1080 1135 1515 1480 975 835 875 825 800 625 565 585 3390 3335 2660 2140 3055 2935 1950 1670 1675 1610 1245 3065 3085 2645 1145 2155 3040 2945 1940 1685 1655 1600 1235 Figure 8 1 Macro Tech 2402 Maximum Power Matrix 1125 CrTOUJN Maximum Power Notes All maximum power specifications are based on 0 1 regulated AC mains and an ambient room temperature of 70 F 21 C International u
28. ed setup techniques consult Crown s Amplifier Applica tion Guide available online at www crownau dio com 2 Use care when making connections selecting signal sources and controlling the output level The load you save may be your own 3 Do not short the ground lead of an output cable to the input signal ground This may forma ground loop and cause oscillations 4 Never connect the output to a power supply battery or power main Electrical shock may result 5 Tampering with the circuitry or making unau thorized circuit changes may be hazardous and invalidates all agency listings 6 Do Not operate the amplifier with the 10C LED constantly flashing bright green 7 Do Not overdrive the mixer which will cause clipped signal to be sent to the amplifier Such signals will be reproduced with extreme accu racy and loudspeaker damage may result 8 Do Not operate the amplifier with less than the rated load impedance Due to the amplifier s output protection such a configuration may result in premature clipping and speaker dam age Crown is not liable for damage that results from overdriving other system components Operation Manual MA 2402 Power Amplifier 4 Operation 4 2 Front Panel Controls and Indicators The diagram below shows the controls and indicators on the front panel of the Macro Tech 2402 A Dust Filters The dust filters remove large particles from the air drawn in by the cooling fan Chec
29. en to very high output levels Operation Manual MA 2402 Power Amplifier 7 Theory of Operation Operation Manual 7 1 Overview Your Macro Tech amplifier incorporates several advanced technological features including real time computer simulation of output transistor stress low stress output stages an advanced heat sink embodiment and the PIP2 Program mable Input Processor expansion system Custom circuitry is incorporated to limit tem perature and current to safe levels making it highly reliable and tolerant of faults Unlike many lesser amplifiers it can operate at its voltage and current limits without self destructing Real time computer simulation is used to cre ate an analogue of the junction temperature of the output transistors hereafter referred to as output devices Current is limited only when the device temperature becomes excessive and by the minimum amount required This pat ented approach is called Output Device Emula tion Protection or ODEP It maximizes the available output power and protects against overheating the major cause of device failure The amplifier is protected from all common hazards that plague high power amplifiers including shorted open or mismatched loads overloaded power supplies excessive tempera ture chain destruction phenomena input over load and high frequency blowups The unit protects loudspeakers from input and output DC as well as turn on and turn off tr
30. ended by 93 68 EEC Signed jets wad Ze Larry Coburn Title Senior Vice President of Manufacturing Date of Issue March 28 2000 Due to line current harmonics we recommend that you contact your supply authority before connection Operation Manual page 3 crown Table of Contents Important Safety Instructions 2 Declaration of Conformity 3 1 Welcome 5 EMA EE UTC SR 5 2 How to Use This Manual 5 3 Setup re 6 3 1 Unpack Your Amplifier 6 3 2 Install Your Amplifier 6 3 3 Ensure Proper Cooling 6 3 4 Choose Input Wire and Connectors 7 3 5 Choose Output Wire and Connectors 7 3 6 Wire Your System oo cesses 8 3 6 1 Stereo Mode un 8 3 6 2 Bridge Mono Mode 8 3 6 3 Parallel Mono Mode 9 3 7 Set Input Sensitivity 10 3 8 Connect to AC Mains 10 3 9 Startup Procedure ou eee 10 4 Operation 10 4 1 Precautions escoria 10 4 2 Front Panel Controls and Indicators 11 4 3 Back Panel Controls Indicators and LOMMECIONS me 12 4 4 Indicators ooo ee eeeeeeteeesteteteeeteeeeneeee 18 5 Advanced Features and Options 14 5 1 Protection Systems 14 SA TUDEP cde obese ctececpeccnes th eteees 14 pa
31. ent that you experience a problem This can greatly aid in determining the source of problems Please contact your local Crown representative or our Technical Support Group for further assistance Figure 6 1 Macro Tech ODEP and Signal IOC Indicator Status over OFF SIGNAL 10 Normal page 18 There is no power to the amplifier and all indicators are off including the Enable light Possible reasons 1 The amplifiers Enable switch is off 2 The amplifier is not plugged into the power receptacle 3 The AC circuit breaker has been tripped 4 The amplifiers low voltage power supply fuse has blown Normal operation for a channel with NO audio output Possible reasons 1 There is no input signal 2 The input signal level is very low 3 The channel s level control is turned down Normal operation for a channel with audio output The ODEP indicator will remain at full intensity to show that there is reserve thermodynamic energy and the Signal IOC indicator will flash with normal intensity to show that the channel has audio output The channel s output is exceeding 0 05 distortion The input signal level is too high and IOC is reporting either an input overload or output clipping OR Channel 2 only The amplifier is in Parallel Mono mode The channel 2 Signal IOC indicator always turns on to full brightness whenever the amplifier s stereo mono switch is set to Parallel Mono mode The amplifier channel is i
32. er expiration of the warranty period THIS STATEMENT OF WARRANTY SUPERSEDES ANY OTHERS CONTAINED IN THIS MANUAL FOR CROWN PRODUCTS 9 07 Operation Manual MA 2402 Power Amplifier 11 Warranty NO NN fra ANN Q iie Operation Manual SUMMARY OF WARRANTY Crown International 1718 West Mishawaka Road Elkhart Indiana 46517 4095 U S A warrants to you the ORIGINAL PURCHASER and ANY SUB SEQUENT OWNER of each NEW Crown1 product for a period of three 3 years from the date of pur chase by the original purchaser the warranty period that the new Crown product is free of defects in materials and workmanship and we further warrant the new Crown product regardless of the reason for failure except as excluded in this Warranty Warranty is only valid within the country in which the product is purchased 1 Note If your unit bears the name Amcron please substitute it for the name Crown in this warranty ITEMS EXCLUDED FROM THIS CROWN WARRANTY This Crown Warranty is in effect only for failure of a new Crown product which occurred within the Warranty Period It does not cover any product which has been damaged because of any inten tional misuse accident negligence or loss which is covered under any of your insurance contracts This Crown Warranty also does not extend to the new Crown product if the serial number has been defaced altered or removed WORLDWIDE EXCEPT USA amp CA
33. er the rare conditions of trans former temperatures rising too high A thermal switch embedded in each transformer removes power to the channel if there is excessive heat The switch automatically resets when the trans former cools to a Safe temperature It is extremely unlikely that you will ever see a Macro Tech 2402 activate transformer thermal protection as long as it is operated within rated conditions see Section 8 Specifications One reason is that ODEP keeps the amplifier work ing under very severe conditions Even so higher than rated output levels excessively low impedance loads and unreasonably high input signals can generate more heat in the trans former than in the output devices These condi tions can overheat the transformer and activate its protection system The Macro Tech 2402 is designed to keep working under conditions where other amplifi ers would fail But even when the limits of the amplifier are exceeded it will still protect itself and your investment from damage Operation Manual MA 2402 Power Amplifier CrTOUJN 5 Advanced Features and Options Operation Manual 5 1 4 Fuses and Circuit Breakers The power supplies of the Macro Tech 2402 are protected by circuit breakers With rated loads and output levels the circuit breakers should only shut down the amplifier in the rare instance of a catastrophic failure Other protec tion systems like ODEP keep the amplifier operational under most
34. eral overheating DC high frequency overloads and full internal fault protection are provided by our latest protection scheme Quad Mute Efficient heat sinks and a self contained forced air cooling system dissipate heat quickly and evenly for extra amplifier protection and greater power output Extra rugged extruded aluminum front panel with ODEP and signal presence IOC indicators for each channel and an Enable indicator Mounts in a standard 19 inch 48 3 cm equipment rack units can also be stacked Three Year No Fault Fully Transferable warranty completely protects your investment and guarantees its specifica tions page 15 crown 5 Advanced Features and Options page 16 5 3 Options 5 3 1 PIP and PIP2 Modules Versatile PIP Programmable Input Processor modules provide flexible expansion features that can be added to customize the amplifier PIP modules plug into the connector inside the back panel of the amplifier PIP modules are available with a features ranging from error driven compressor limiters to remote control and monitoring via lQwic or System Architect Your amplifier is a PIP2 amplifier which means it can take advantage of the many advanced fea tures found in PIP2 modules as well as all standard PIP modules Visit the Crown website at www crownaudio com or contact Crown Customer Service for descriptions of available PIP and PIP2 modules The modules install easily For P
35. es The Macro Tech 2402 has a back panel Reset switch for each channel Each switch resets the circuit breaker that protects the channel s power supply from overload PUSH TO RESET Y Programmable Input Processor P P MODEL MACRO TECH 2402 SERIES A AC VOLTS 120 AMPS 17 60 MAXIMUM OUTPUT 900 WATTS PER CHANNEL INTO 2 OHMS AT 1 KH WITH NO MORE THAN 0 1 THD STEREO PARALLEL BRIDGE MONO II MONO REG U S PAT OPA 4 330 809 CAUTION TURN OFF AMPLIFIER 4 611 180 BEFORE CHANGING THIS SWITCH J PIP Module The standard PIP2 FXQ is included with your amplifier It provides female three pin XLR input connectors A vari ety of other PIP modules can be used in place of the PIP2 FXQ They add additional features that customize the amplifier for different applications see Section 5 3 1 for information on available PIP modules Input Sensitivity Switch not shown The three position input sensitivity switch located inside the amplifier can be set after removing the PIP module J It is set at the factory to 0 775 volts for standard 1 kHz output into 8 ohms It can also be set to 1 4 volts for standard 1 kHz output into 8 ohms or a fixed voltage gain of 26 dB see Section 3 7 K Balanced Phone Jack Inputs Balanced 1 4 inch phone jack input connectors are pro vided on the PIP2 FXQ The phone jacks can be wired for either balanced tip ring and sleeve or unbalanced tip and sleeve input signals Caution Th
36. evel Sec ond ODEP data is fed to the back panel PIP connector so advanced PIP modules like the IQ PIP USP3 can use it to monitor and control the amplifier With ODEP the show keeps going because you get the maximum power with the maximum protection 5 1 2 Standby Mode An important part of a Macro Tech amplifier s protection systems is standby mode Standby protects the amplifier during potentially cata strophic conditions It temporarily removes bias in all four output stages protecting the amplifier and its loads This advanced protec tion implementation called Quad Mute is new to the Macro Tech series amplifiers standby mode can be identified using the indi cator table in Section 6 Troubleshooting standby mode can be activated in several situa tions First if dangerous subsonic frequencies or direct current DC is detected in the ampli fier s output the unit will activate its DC low frequency protection circuitry and put the affected channels in standby This protects the loads and prevent oscillations The unit resumes normal operation as soon as the amplifier no longer detects dangerous low fre quency or DC output Although it is extremely unlikely that you will ever activate the ampli fier s DC low frequency protection system improper source materials such as subsonic Square waves or input overloads that result in excessively clipped input signals can activate this system The amplifier s fault protec
37. ff if a high voltage power supply is put in standby mode a high voltage power supply fuse or breaker blows or a transformer acti vates its thermal protection circuitry see Sec tion 5 1 3 Both ODEP indicators turn off if the amplifier loses AC power the power switch is turned off or the low voltage power supply fuse blows The green Signal 10C indicators show sig nal presence and distortion As signal presence indicators they flash with normal intensity in sync with the output audio signals As IDC Input Output Comparator indicators they flash brightly if there is any difference between the input and output signal waveforms greater than 0 05 Because transient distortion hap pens quickly a 0 1 second hold delay keeps the indicators on long enough to be easily noticed The IOC function essentially provides proof of distortion free performance Note The Channel 2 106 indicator will remain lit when running in Parallel Mono mode 30 ENABLE Figure 4 3 Indicators crown Under conditions where one of the amplifier s high voltage power supplies is temporarily put in standby mode the Signal lOC indicators will stay on with full brightness They will resume normal operation when the amplifier is no longer in standby mode page 13 CrTOUJMN 5 Advanced Features and Options page 14 5 1 Protection Systems Macro Tech amplifiers provide extensive pro tection and diagnostics capabilities Protection sy
38. ge 4 5 1 2 Standby Mode oooococcnincioomcoom 14 5 1 3 Transformer Thermal Protection 14 5 1 4 Fuses and Circuit Breakers 15 5 2 Advanced F ES 15 5 3 OC LE d ecunenergectecnntaceneauasens 16 5 3 1 PIP and PIP2 Modules 16 5 3 2 Cooling Fan Options o 17 5 3 3 Level Control Shaft LOCK 17 6 Troubleshooting 18 7 Theory of Operation 19 LON saussun 19 e COUNT THON 19 7 2 1 Stereo Operation 19 7 2 2 Bridge Mono Operation 20 7 2 3 Parallel Mono Operation 20 8 Specifications cence 21 9 AC Power Draw and Thermal Dissipation 25 10 Service aaaeaiiseeiineeiiinrrrirrrrienrrn 27 10 1 International and Canada Service 21 10 2 UG SEMICR a 2T 10 2 1 Service at a US Service Center 21 10 2 2 Factory Servite 21 10 2 3 Factory Service Shipping Instructions 27 10 2 4 Packing Instructions 21 10 2 5 Estimate Approval 21 10 2 6 Payment of Non Warranty Repairs 21 11 NAFFANIV dunes 28 Product Registration Form 31 Factory Service Information FOrM ou 33 MA 2402 Power Amplifier Operation Manual MA 2402 Power Amplifier MA 2402 po Power 2 ohm Dual per ch 1 050W 850W 4 ohm Dual
39. h changes the direction of the air flow in and out of the amplifier not recommended for the Macro Tech 2402 Important The optional replacement fan blades should only be installed by a qualified tech nician CG PIN A 5 3 3 Level Control Shaft Lock A security accessory the shaft lock can be used to secure your amplifier s level controls in situations where the front panel controls are subject to tamper Plug In CABLE B ing One is needed for each channel They can be BACK PANEL ordered through the Crown Service Parts Depart ment part number D 6932 4 For more information bd contact your local Crown dealer or Crown Technical T18 PIN 8 t Rotate PIP2 180 in O gt opposite direction gt CK PANEL ER Figure 5 4 Installing a Level Control Shaft Lock ep O yo o 20 PIN A Figure 5 3 Installing a PIP2 Module Operation Manual page 17 CrTOUJN MA 2402 Power Amplifier 6 Troubleshooting Indicator Status Amplifier Condition The table in Figure 6 1 shows the possible states for the ODEP and Signal I0C indica tors It also describes the conditions that may be associated with the different indica tor states The Enable indicator will be off with the first indicator state There is no power to the amplifier All other conditions in the table will occur with the Enable indi cator turned on It is important to note the possible states of the indicators in the rare ev
40. he data presented in Figure 9 1 Total output power with all Duty AC Mains Power _ Channels driven watts Cycle Quiescent Power Draw watts Amplifier Efficiency 65 Draw watts The quiescent power draw of 90 watts is a maximum value and includes power drawn by the fan The following equation converts power draw in watts to current draw in amperes AC Mains Power Current Draw _ __ Draw watts amperes AC Mains Power Voltage Factor 83 The power factor of 0 83 is needed to compensate for the difference in phase between the AC mains voltage and current The following equa tion is used to calculate thermal dissipation Dissipation Thermal Total output power with all Duty btu hr Draw watts Amplifier Efficiency 65 The constant 0 35 is inefficiency 1 00 0 65 and the factor 3 415 converts watts to btu hr Thermal dissipation in btu is divided by the constant 3 968 to get kcal If you plan to measure output power under real world conditions the following equation may also be helpful Thermal Total measured output power 35 Guiesceht Powe Dissipation from all channels watts Draw waite X 3 415 btu hr Amplifier Efficiency 65 channels driven watts Cycle x 35 Quiescent P x 3 415 page 25 Croup MA 2402 Power Amplifier 9 AC Power Draw and Thermal Dissipation Macro Tech 2402 8 Ohm Stereo 4 Ohm Stereo 8 Ohm Bridge Mono 2 Ohm Parallel Mono 2 Ohm Stereo 4 Ohm Br
41. his manual so that you can obtain the best possible service from your amplifier 1 1 Features e Crown s Groundea Bridge design deliv ers large voltage swings without using easily stressed output transistor configu rations like conventional amplifiers The results are lower distortion and superior reliability e Patented ODEP Output Device Emulation Protection circuitry compensates for overheating and overload to keep the amplifier working when others would fail Complete protection against shorted open and mismatched loads overheating DC high frequency overload and full internal fault protection provided by our latest protection scheme Quad Mute Two mono modes Bridge Mono and Parallel Mono for driving a wide range of load impedances Dedicated power supply transformers iso late channels in Stereo mode for superb crosstalk characteristics and reliability each channel is virtually a separate amplifier High damping factor provides superior control over low frequency drivers for a clean accurate low end PIP Programmable Input Processor con nector accepts accessories that tailor the amplifier to suit specific applications Enhanced P P2 Programmable Input Processor connector accepts new acces sory modules that further tailor the ampli fier to Suit specific applications including wideband load current monitoring Backed by the industry s ONLY three year no fault fully transfe
42. idge Mono 1 Ohm Parallel Mono AC Mains Current Draw Amps Thermal Dissipation AC Mains Current Draw Amps Thermal Dissipation AC Mains Current Draw Amps Thermal Dissipation Figure 9 1 Macro Tech 2402 ee Boe i raw raw raw Power Draw Current Draw Watts 100 120V 220 240V btu hr kcal Watts 100 120 V 220 240 V btu hr kcal watts 100 120V 220 240 V btu hr and Thermal Dissipation at Various Duty Cycles page 26 Operation Manual MA 2402 Power Amplifier 10 Service Crown amplifiers are quality units that rarely require ser vicing Before returning your unit for service please con tact Crown Technical Support to verify the need for Servicing This unit has very sophisticated circuitry which should only be serviced by a fully trained technician This is one reason why each unit bears the following label CAUTION To prevent electric shock do not remove covers No user serviceable parts inside Refer servicing to a qualified technician Complete the Crown Audio Factory Service Information form in the back of this manual when returning a Crown product to the factory or authorized service center The form must be included with your product inside the box or in a packing slip envelope securely attached to the outside of the shipping carton Do not send this form separately Warranty is only valid within the country in which the product is pu
43. ircuit U104 B receives a signal from the output of the amplifier and differ ences it with the signal at the Vcc supply The bridge balanced circuit then develops a voltage to drive the bridge balanced output stage This results in the Vcc supply having exactly one half of the out put voltage added to their quiescent voltage D309 D310 D311 and a trimmer resistor set the quiescent current point for the bridge balanced output stage The protection mechanisms that affect the signal path are implemented to protect the amplifier under real world conditions These conditions are high instantaneous current excessive temperature and output device operation outside safe conditions Q107 and Q108 sense current in the output stage and act as a conventional current limiter When cur rent at any one instant exceeds the design criteria the limiters remove the drive from the LVAs thus limiting current in the output stage to a safe level BALANCE INPUT STAGE gt A XLR en Es CURRENT INPUTS N 1 4 PHONE DISPLAY ONLY ONE CHANNEL SHOWN page 20 To further protect the output stages the patented ODEP circuitry is used It produces an analog out put proportional to the always changing safe oper ating area of the output transistor This output controls the translator stage previously mentioned removing any further drive that may exceed the safe operating area of the output stage Thermal sensor S100 gives the ODEP circuits vit
44. k the filters regularly to prevent clogging The filter ele ments can be easily removed for cleaning by gently pulling them away from the front panel B Level Controls The output level for each channel is set with these convenient Level controls mounted on the front panel Each level control has 31 detents for precise adjustment A security option is available to prevent tampering see section 5 3 3 C Signal 10C Indicators These green multifunction indicators show sig nal presence and distortion for each channel As signal presence indicators they flash syn chronously with the output audio signals to show their presence As IOC Input Output Comparator indicators they flash brightly with a 0 1 second hold delay if there is a difference of 0 05 or more between the input and output signal waveforms This provides proof of dis tortion free performance Note The Channel 2 IOC indicator stays on in Parallel Mono mode see Section 3 6 3 D ODEP Indicators During normal operation of the ODEP Output Device Emulation Protection circuitry these amber indicators glow brightly to show the presence of reserve thermal dynamic energy crown They dim proportionally as energy reserves decrease In the rare event that energy reserves are depleted the indicators turn off and ODEP proportionally limits output drive so the ampli fier can safely continue operating even under severe conditions These indicators can also he
45. lp identify more unusual operating condi tions see Section 5 1 1 E Enable Indicator This indicator lights when the amplifier has been enabled or turned on and AC power is available F Enable Switch This push button is used to turn the amplifier on and off When turned on the output is muted for approximately four seconds to pro tect your system from start up transients This delay can be changed Contact Crown s Techni cal Support Group for details MACrO TECH 2402 NS ae SS VE VE EA EE E A B C D D C B E F Figure 4 1 Front Panel Controls 8 Indicators Operation Manual page 11 CrTOUJN 4 Operation page 12 4 3 Back Panel Controls Indicators and Connec tors G Power Cord The power cord has an appropriate plug for the required voltage 120 VAC 60 Hz North American Macro Tech 2402s have 12 AWG line cords and NEMA 5 20P plugs International units are shipped with an appropriate line cord and plug See Section 7 for AC power usage H Stereo Mono Switch The three operating modes of a Macro Tech amplifier are controlled by this switch Stereo mode is used for nor mal two channel operation Bridge Mono mode is used to drive a single channel with a load impedance of at least 4 ohms and Parallel Mono mode is used to drive a single channel with an impedance less than 4 ohms Important Turn off the amplifier before changing the stereo mono switch see Sections 3 6 2 and 3 6 3 l Reset Switch
46. n standby mode Possible reasons 1 A PIP module like an IQ PIP Lite has turned off the channels high voltage power supply 2 The amplifier has just been turned on and is still in the four second turn on delay 3 The DC low frequency protection circuitry has been activated 4 The fault protection circuitry has been activated 5 The transformer thermal protection circuitry has been activated OR A channel s fuse has blown or breaker has tripped Transformer overload can cause a channel s internal fuse to blow or can cause the channels circuit breaker to trip OR ODEP limiting has been activated Possible reasons 1 The amplifier s air filters are blocked and need to be cleaned 2 There is insufficient cooling because of inadequate air flow or air that is too hot 3 The load impedance for the channel is too low because the output is shorted or the amplifier is driving too many loudspeakers for the selected stereo mono mode 4 The amplifier channel is continuously being driven to very high output levels ODEP limiting is about to begin Possible reasons 1 The amplifier s air filters are blocked and need to be cleaned 2 There is insufficient cooling because of inadequate air flow or air that is too hot 3 The load impedance for the channel is too low because the output is shorted or the amplifier is driving too many loudspeakers for the selected stereo mono mode 4 The amplifier channel is continuously being driv
47. nds only Facsimile 574 294 8301 Technical Support 574 294 8124 Factory Service Internet htto www crownaudio com page 27 crown 11 Warranty ej A Ad Ze dd Zs 7 page 28 SUMMARY OF WARRANTY Crown International 1718 West Mishawaka Road Elkhart Indiana 46517 4095 U S A warrants to you the ORIGINAL PURCHASER and ANY SUB SEQUENT OWNER of each NEW Crown product for a period of three 3 years from the date of purchase by the original purchaser the warranty period that the new Crown product is free of defects in materials and workmanship We further warrant the new Crown product regardless of the reason for failure except as excluded in this War ranty Warranty is only valid within the country in which the product was purchased ITEMS EXCLUDED FROM THIS CROWN WARRANTY This Crown Warranty is in effect only for failure of a new Crown product which occurred within the Warranty Period It does not cover any product which has been damaged because of any inten tional misuse accident negligence or loss which is covered under any of your insurance contracts This Crown Warranty also does not extend to the new Crown product if the serial number has been defaced altered or removed WHAT THE WARRANTOR WILL DO We will remedy any defect regardless of the rea son for failure except as excluded by repair replacement or refund We may not elect refund unless you agree or unless
48. nits with multi tap transformers are specified for the best case transformer tap normally 240 VAC 60 Hz Although it is an unusual condition your amplifier can function well with AC mains volt ages up to 10 over the specified line voltage With overvoltage conditions your amplifier may be capable of delivering instantaneous power levels up to 20 greater than the specifications in the matrix 1 A single cycle sine wave is presented to the amplifier and monitored for nonlinear distortion The average power during the burst is reported Loudspeakers must be able to withstand this level if they are to be safely used with this ampli fier 2 A 40 millisecond sine wave burst 10 duty cycle is presented to the amplifier and moni tored for nonlinear distortion The average power during the burst is reported This power level is a measurement of the amplifiers maximum tran sient power than can be perceived by the human ear page 23 CrTOUJN MA 2402 Power Amplifier 8 Specifications Minimum Power Notes All minimum power specifications are based on Maximum Average FTC Continuous Average 0 1 regulated AC mains and an ambient room At 0 1 THD At0 1 THD At0 05 THD At 0 1 THD epee OE AS lala See note 1 See note 2 See note 3 See note 4 with multi tap transformers are specified for the worst case transformer tap normally 100 VAC 1 kHz 20Hz 20kHz 20Hz 20kHz 50 Hz The standard EIA power measurement RS 490
49. ntee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or televi sion reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures e Reorient or relocate the receiving antenna e Increase the separation between the equipment and receiver e Connect the equipment into an outlet on a circuit different from that to which the receiver is connected e Consult the dealer or an experienced radio TV technician for help Operation Manual MA 2402 Power Amplifier CrTOUJN Crown Audio Inc DECLARATION of CONFORMITY TCF Technical Certificate No P4300CRI1 IWS Technical Construction File Route Issued By Crown Audio Inc FOR COMPLIANCE QUESTIONS ONLY Sue Whitfield 1718 W Mishawaka Road 574 294 8289 Elkhart Indiana 46517 U S A Swhitfield crownintl com Competent Body s Name and Address European Representative s Name and Address Technology International Europe Limited David Budge 41 42 Shrivenham Hundred Business Park 10 Harvest Close Shrivenham Swindon Wilts SN6 8TZ Yateley GU46 6YS ia United Kingdom Equipment Type Commercial Audio Power Amplifiers Family Name Macro Tech Model Names Macro Tech 2402 EMC Standards EN 55103 1 1995 Electromagnetic Compatibility Product Family Standard for Audio Video Audio Visual and Entertainment Lighting C
50. ontrol Apparatus for Professional Use Part 1 Emissions EN 55103 1 1995 Magnetic Field Emissions Annex 10 cm and 1 M EN 61000 3 2 1995 A14 2000 Limits for Harmonic Current Emissions equipment input current lt 16A per phase EN 61000 3 3 1995 Limitation of Voltage Fluctuations and Flicker in Low Voltage Supply Systems Rated Current lt 16A EN 55022 1992 A1 1995 amp A2 1997 Limits and Methods of Measurement of Radio Disturbance Characteristics of ITE Radiated Class B Limits Conducted Class B EN 55103 2 1996 Electromagnetic Compatibility Product Family Standard for Audio Video Audio Visual and Entertainment Lighting Control Apparatus for Professional Use Part 2 Immunity EN 61000 4 2 1995 Electrostatic Discharge Immunity Environment E2 Criteria B 4k V Contact 8k V Air Discharge EN 61000 4 3 1996 Radiated Radio Frequency Electromagnetic Immunity Environment E2 criteria A EN 61000 4 4 1995 Electrical Fast Transient Burst Immunity Criteria B EN 61000 4 5 1995 Surge Immunity Criteria B EN 61000 4 6 1996 Immunity to Conducted Disturbances Induced by Radio Frequency Fields Criteria A EN 61000 4 11 1994 Voltage Dips Short Interruptions and Voltage Variation Safety Standard EN 60065 1998 Safety Requirements Audio Video and Similar Electronic Apparatus certify that the product identified above conforms to the requirements of the EMC Council Directive 89 336 EEC as amended by 92 31 EEC and the Low Voltage Directive 73 23 EES as am
51. other severe condi tions The circuit breakers can also shut down the amplifier in cases where extremely low impedance loads and high output levels result in current draw that exceeds their rating Again this should only be possible when operating outside rated conditions such as when the amplifier is used to drive a 1 ohm load in Ste reo mode or when a signal overloads the input and is clipped severely The Macro Tech 2402 has a separate fuse for the low voltage power supply and breakers for the high voltage power supplies The Macro Tech 2402 does not blow its fuse or trip its breakers unless something is wrong In the rare event that an internal fuse blows please refer the unit to a qualified technician If a breaker trips try to identify and correct the problem before resetting the breakers with the back panel Reset switches If the problem per sists refer the unit to a qualified technician 5 2 Advanced Features The Macro Tech 2402 uses cutting edge tech nology to deliver the ultimate in power and value for its size weight and price It offers numerous advantages over conventional designs and provide benefits you can t get in amplifiers from any other manufacturer Here are some of its many features e Crown s Grounded Bridge design deliv ers large voltage swings without using easily stressed output transistor config urations like conventional amplifiers The results are lower distortion and superior reliability
52. product it may be mailed or faxed Crown Audio Inc Fax 574 294 8329 1718 W Mishawaka Rd Elkhart IN 46517 Please note that some information is required Incomplete registrations will not be processed Indicates required information OWNER S INFORMATION PLEASE PRINT First name Middle initial Last name Company Mailing address City State Zip Code Country E mail address Phone include area code Fax PRODUCT INFORMATION MODEL SERIAL PURCHASE DATE e g IT8000 CDi1000 PCC 160 e g 8000000000 mo day yr _ A A A A A SR A AA AA Product purchased from Business Individual Country Comments Y J 1718 W Mishawaka Rd croun page 31 THIS PAGE INTENTIONALLY LEFT BLANK MA 2402 Power Amplifier CrTOUJN Crown Factory Service Information Shipping Address Crown Factory Service 1718 W Mishawaka Rd Elkhart IN 46517 PLEASE PRINT CLEARLY SRA If sending product to Crown factory service Model Serial Number Purchase Date PRODUCT RETURN INFORMATION Individual or Business Name If warranty is expired please provide method of payment Proof of purchase may be required to validate warranty PAYMENT OPTIONS have open account payment terms Purchase order required PO _ _ _ o o o Y o Y Y AR A Q COD Credit Card Information below is required however if you do not want to provide this information at this time we will contact
53. rable warranty CrTOUJN 2 How to Use This Manual This manual provides you with the necessary information to safely and correctly set up and operate your amplifier It does not cover every aspect of installation setup or operation that might occur under every condition For addi tional information please consult Crown s Amplifier Application Guide available online at www crownaudio com Crown Technical Sup port your system installer or retailer We strongly recommend you read all instruc tions warnings and cautions contained in this manual Also for your protection please send in your warranty registration card today And save your bill of sale it s your official proof of purchase page 5 page 6 3 1 Unpack Your Amplifier Please unpack and inspect your amplifier for any damage that may have occurred during transit If damage is found notify the transportation company immediately Only you can initiate a claim for ship ping damage Crown will be happy to help as needed Save the shipping carton as evidence of damage for the shipper s inspection We also recommend that you save all packing mate rials so you will have them if you ever need to trans port the unit Never ship the unit without the factory pack YOU WILL NEED not supplied e Input wiring cables e Output wiring cables Rack for mounting amplifier or a stable surface for stacking WARNING Before you start to set up your amplifier
54. rchased 10 1 International and Canada Service Service may be obtained from an authorized service cen ter Contact your local Crown Amcron representative or our office for a list of authorized service centers To obtain service simply present the bill of sale as proof of purchase along with the defective unit to an authorized service center They will handle the necessary paperwork and repair Remember to transport your unit in the original factory pack 10 2 US Service Service may be obtained in one of two ways from an authorized service center or from the factory You may choose either It is important that you have your copy of the bill of sale as your proof of purchase 10 2 1 Service at a US Service Center This method usually saves the most time and effort Sim ply present your bill of sale along with the defective unit to an authorized service center to obtain service They will handle the necessary paperwork and repair Remem ber to transport the unit in the original factory pack A list Operation Manual of authorized service centers in your area can be obtained from Crown Factory Service or online from http www crownaudio com support servcent htm 10 2 2 Factory Service Crown accepts no responsibility for non serviceable product that is sent to us for factory repair It is the owner s responsibility to ensure that their product is ser viceable prior to sending it to the factory Serviceable product lis
55. reason able time of the date of receipt of the defective product by us or our authorized service center If the repairs made by us or our authorized service center are not satisfactory notify us or our autho rized service center immediately DISCLAIMER OF CONSEQUENTIAL AND INCIDENTAL DAMAGES YOU ARE NOT ENTITLED TO RECOVER FROM US ANY INCIDENTAL DAMAGES RESULTING FROM ANY DEFECT IN THE NEW CROWN MA 2402 Power Amplifier PRODUCT THIS INCLUDES ANY DAMAGE T0 ANOTHER PRODUCT OR PRODUCTS RESULT ING FROM SUCH A DEFECT SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATIONS OF INCIDENTAL OR CONSEQUENTIAL DAM AGES SO THE ABOVE LIMITATION OR EXCLU SION MAY NOT APPLY TO YOU WARRANTY ALTERATIONS No person has the authority to enlarge amend or modify this Crown Warranty This Crown War ranty is not extended by the length of time which you are deprived of the use of the new Crown product Repairs and replacement parts provided under the terms of this Crown Warranty shall carry only the unexpired portion of this Crown Warranty DESIGN CHANGES We reserve the right to change the design of any product from time to time without notice and with no obligation to make corresponding changes in products previously manufactured LEGAL REMEDIES OF PURCHASER THIS CROWN WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS YOU MAY ALSO HAVE OTHER RIGHTS WHICH VARY FROM STATE TO STATE No action to enforce this Crown Warranty shall be commenced aft
56. ridge Mono balanced output on 5 N o o lt gt N yq Parallel Mono Stereo both channels driven Bridge Mono balanced output International Units page 24 Operation Manual MA 2402 Power Amplifier 9 AC Power Draw and Thermal Dissipation Operation Manual This section provides detailed information about the amount of power and current drawn from the AC mains by the Macro Tech 2402 amplifier and the amount of heat produced under various conditions The calcula tions presented here are intended to provide a realistic and reliable depiction of the amplifier The following assumptions or approximations were made e The amplifiers available channels are loaded and full power is being delivered e Amplifier efficiency at standard 1 kHz power is estimated to be 65 e Quiescent power draw is 90 watts an almost negligible amount for full power calculations e Quiescent thermal dissipation equals 105btu hr at 90 watts e The estimated duty cycles take into account the typical crest factor for each type of source material e Duty cycle of pink noise is 50 e Duty cycle of highly compressed rock n roll midrange is 40 e Duty cycle of rock n roll is 30 e Duty cycle of background music is 20 e Duty cycle of continuous speech is 10 e Duty cycle of infrequent short duration paging is 1 CrTOUJN Here are the equations used to calculate t
57. ructions Do not use this apparatus near water Clean only with a dry cloth Do not block any ventilation openings Install in accordance with the manufacturer s instructions Do not install near any heat sources such as radiators heat reg isters stoves or other apparatus including amplifiers that produce heat Do not defeat the safety purpose of the polarized or grounding type plug A polarized plug has two blades with one wider than the other A grounding type plug has two blades and a third grounding prong The wide blade or the third prong is provided for your Safety If the provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet Protect the power cord from being walked on or pinched par ticularly at plugs convenience receptacles and the point where they exit from the apparatus Only use attachments accessories specified by the manufac turer Use only with a cart stand tripod bracket or table specified by the manufacturer or sold with the apparatus When a cart is used use caution when moving the cart apparatus combination to avoid injury from tip over Unplug this apparatus during lightning storms or when unused for long periods of time Refer all servicing to qualified service personnel Servicing is required when the apparatus has been damaged in any way such as power supply cord or plug is damaged liquid has been spilled or objects have fallen into the apparatu
58. s the apparatus has been exposed to rain or moisture does not operate nor mally or has been dropped Use the mains plug to disconnect the apparatus from the mains WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS APPARATUS TO RAIN OR MOISTURE DO NOT EXPOSE THIS EQUIPMENT TO DRIPPING OR SPLASHING AND ENSURE THAT NO OBJECTS FILLED WITH LIQUIDS SUCH AS VASES ARE PLACED ON THE EQUIP MENT THE MAINS PLUG OF THE POWER SUPPLY CORD SHALL REMAIN READILY OPERABLE MA 2402 Power Amplifier Wichtige Sicherheitsinstruktionen Instrucciones de Seguridad Importantes TO PREVENT ELECTRIC SHOCK DO NOT REMOVE TOP OR BOTTOM COVERS NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL A PR VENIR LE CHOC LECTRIQUE N ENLEVEZ PAS LES _ COUVERCLES IL N Y A PAS DES PARTIES SERVICEABLE A L INT RIEUR TOUS REPARATIONS DOIT ETRE FAIRE PAR PERSONNEL QUALIFIE SEULMENT PARA PREVENIR UN CHOQUE ELECTRICO NO RETIRE LAS CUBIERTAS SUPERIOR O INFERIOR NO EXISTEN PARTES QUE PUEDAN SER REPARADAS POR EL USUARIO AL INTE RIOR REMITA EL SERVICICO AL PERSONAL TECHNICAL CALIFICADO TO COMPLETELY DISCONNECT THIS EQUIPMENT FROM THE AC MAINS DISCONNECT THE POWER SUPPLY CORD PLUG FROM THE AC RECEPTACLE THE MAINS PLUG OF THE POWER SUPPLY CORD SHALL REMAIN READILY OPERABLE POUR DEMONTER COMPLETEMENT L QUIPEMENT DE L ALIMENTATION GENERALE DEMONTER LE CABLE D ALI MENTATION DE SON RECEPTACLE LA PRISE
59. stems include ODEP standby mode fuses or breakers and special thermal protection for the unit s transformers 5 1 1 ODEP Crown invented ODEP to solve two long stand ing problems in amplifier design to prevent amplifier shutdown during demanding opera tion and to increase the efficiency of the output circuitry To do this Crown established a rigorous pro gram to measure the safe operating area SOA of each output transistor before installing it in an amplifier Next Crown designed intelligent circuitry to simulate the instantaneous operat ing conditions of those output transistors Its name describes what it does Output Device Emulation Protection or ODEP In addition to simulating the operating conditions of the out put transistors it also compares their operation to their known SOA If it sees that more power is about to be asked of them than they are capa ble of delivering under the present conditions ODEP immediately limits the drive level until it falls within the SOA Limiting is proportional and kept to an absolute minimum only what is required to prevent output transistor damage This level of protection enables Crown to increase output efficiency to never before achieved levels while greatly increasing ampli fier reliability The on board intelligence is monitored in two ways First the front panel ODEP indicators show whether the amplifier is functioning cor rectly or if ODEP is limiting the drive l
60. t is available at http crownweb crownintl com crownrma For more information please contact us direct A Service Return Authorization SRA is required for product being sent to the factory for repair An SRA can be completed online at www crownaudio com support factserv htm If you do not have access to the web please call Crown s Customer Service at 574 294 8200 or 800 342 6939 extension 8205 For warranty service we will pay for ground shipping both ways in the United States Contact Crown Customer Service to obtain prepaid shipping labels prior to send ing the unit Or if you prefer you may prepay the cost of shipping and Crown will reimburse you Send copies of the shipping receipts to Crown to receive reimbursement Your repaired unit will be returned via UPS ground Please contact us if other arrangements are required 10 2 3 Factory Service Shipping Instruc tions 1 Service Return Authorization SRA is required for product being sent to the factory for service Please complete the SRA by going to www crownaudio com support factserv htm If you do not have access to our website call 1 800 342 6939 extension 8205 and we ll create the SRA for you 2 See packing instructions that follow 3 Ship product to CROWN AUDIO FACTORY SERVICE 1718 W MISHAWKA RD ELKHART IN 46517 4 Use a bold black marker and write the SRA number on three sides of the box 5 Record the SRA number for future reference The SRA n
61. tion system will put an amplifier channel in standby mode in rare situations where heavy common mode current is detected in the channel s output The ampli fier should never output heavy common mode current unless its circuitry is damaged in some way and putting a channel in standby mode helps to prevent further damage The amplifier s transformer thermal protection circuitry is activated in very unusual circum stances where the unit s transformer tempera ture rises to unsafe levels Under these abnormal conditions the amplifier will put the channel of the affected transformer in standby mode The amplifier will return to normal oper ation after the transformer cools to a safe tem perature For more information on transformer thermal protection refer to section 5 1 3 MA 2402 Power Amplifier An IQ PIP module may also temporarily place the amplifier in standby mode typically for power conservation The standby mode status can be triggered manually The auto standby can be triggered via the control software in which case the standby status will be automati cally cancelled when the defined level of input signal is detected If the unit has been placed into a standby state not auto standby this sta tus must be manually cleared using either lQwic or System Architect control software 5 1 3 Transformer Thermal Protec tion The Macro Tech 2402 has transformer thermal protection It protects the power supplies from damage und
62. umber can be used to check the repair status 10 2 4 Packing Instructions Important These instructions must be followed If they are not followed Crown Audio Inc assumes no respon sibility for damaged goods and or accessories that are sent with your unit 1 Fill out and include the Crown Audio Factory Ser vice Information sheet in the back of this manual 2 Donot ship any accessories manuals cords hard ware etc with your unit These items are not needed to service your product We will not be responsibility for these items 3 When shipping your Crown product it is important that it has adequate protection We recommend you use the original pack material when returning the product for repair If you do not have the original box please call Crown at 800 342 6939 or 574 294 8210 and order new pack material See instructions for foam in place shipping pack Do not ship your unit in a wood or metal cabinet 4 If you provide your own shipping pack the mini mum recommended requirements for materials are as follows a 275 PSI burst test Double Wall carton that allows for 2 inch solid Styrofoam on all six sides of unit or 3 inches of plastic bubble wrap on all six sides of unit b Securely seal the package with an adequate carton sealing tape c Donot use light boxes or peanuts Damage caused by poor packaging will not be covered under war ranty Using your foam in place shipping pack Note

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