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YAMAHA A-1 Manual

1. 117 Total Harmonic Distortion 96 OUTPUT W EE gt _ B 2 ys 3 2 E a 55 ud 28 E 5 Cet gt 6 F 52 3 2 EE 2 6 o F 2 gt aD 5 7 2 Z f D 6 gt NOLLVANALLY 3WD10A Eg 10 ro ores Zu 20 52 29 BP 9 NOILHOLSIO DINOWHYH 1V 1OL 9 u i E gt 5 i 5 am 2 3 9 5 E Lu 2 cc 5 O uL d eee 2 S 7 o E 2 a lt lt NOILYOLSIG NOIL V IQ GOMWH3ANI O aS Ot gt e ul E gt dd 5 5 miaa Q 5 S Bis 2 5 E g Sc ne EA 04 a E t 5 2 8 s 5 a E T 5 5 I 5 si gt 5 4 a B 5 22 go 8 9 NOILHOISIG 17101 55 9 NOILHOLSIG 2INOWHYH 1
2. mr Es mG PHONG aux TUNER PHONO INPUT SELECTOR SELECTOA io 1 2 4 a ui TAPE PHONES BASS TREBLE TONE MODE MONITOR CONNECTION Connect the tuner output terminals to the A 1 TUNER input jacks on the rear panel using the pin plug cable provided Make sure to confirm that the left hand and the right hand outputs are con nected to the proper input terminals Next set the DISC switch to OFF and the TAPE MONITOR switch to OFF position To enjoy your tuner push the TUNER push but ton of the INPUT SELECTOR and operate the tuner to receive the desired AM or FM signal PIN CORD To OUTPUT VOLUME This is a spare input for any sound source you wish to connect to the A 1 When connecting a stereo source to these terminals insure the left hand and the right hand plugs are inserted in the proper terminals This input has a sensitivity of 200mV and can be used for such inputs as mic mixer amplifier 8 track tape player To listen these auxiliary sound sources first set the DISC switch to OFF and the MONITOR switch to OFF position Next push the AUX push button of the INPUT SELECTOR and oper ate the connected audio equipment PIN CORD Mic Mixer Amplifier Fig 5 ___ _ _ Connect tape recorder to the A 1 as follows A 1 Rear Panel Tape Deck Termin
3. 0 003 Output Level Impedance 17 1 8 x 4 2 x15 Power Bandwidth 80 35 watts 0 03 T H D REC OUT _ 200mV 6002 Weight 15 809 3416 1300 7 10 to 50 000Hz PREOUT __ 2V 6000 2 Specifications subject to change without notice Damping Factor 89 1kHz Signal to Noise Ratio u Better than 100 _ 854B IHA A Network Frequency Response PHONO MC 7088 IHA A Network TUNER AUX TAPE to Sp Out 80 m O B s Qd 20 to 20 000Hz 0dB 0 2 TONE OFF 10Hz 0 100kHz Os dB Noise DISC ON 112dB TONE OFF 105dB TONE ON TONE ON 10Hz 4 0 5dB 100kHz 0 DdB BLOCK DIAGRAM Shows only one channel MC Ame PHONO SELECTOR uides eS on VOLUME PHONO MM CARTRIDGE INPUT MODIE RELAY SPEAKER SELECTOR PHONO OFF TUNER OFF OFF MONO ON BASS TREBLE ON AUX PHONES pues OUT TAPE TAPE PB PRE OUT GND ji Constant voltage Power Power Transformer Source for Preamplitier Relay and Lamp AC 50 60 Hz To Main Amplifier SWITCHED UNSWITCHED SCHEMATIC DIAGRAM EET 1 NA0 7046 C701 25K 1DO Via ow HAd7044 1 2 ASW 044 272 801 0504 0522 092 0 1156855 2 960919084 1
4. If yours is a normal MM cartridge connect a car tridge load plug with 47k 2 impedance to the PHONO CARTRIDGE LOAD terminal In case of cartridges with other than 47kQ im pedance connect a 68k22 cartridge load plug or if the indicated load impedance is 100 do not connect any plug Fig 2 N SHORT PLUG WY XO CARTRIDGE LOAD PLUG Frequency Response vs Phono Impedance TE FREQUENCY 442 RESPONSE 48 KHz CONNECTING AND OPERATING THE A 1 WITH OTHER COMPONENTS Refer to page 12 as to the cartridge load plugs In case of MC moving coil cartridge connect the output cord directly to the PHONO MC terminal When connecting confirm L and R of the pin plug provided at the tip of shield wire from a player and then connect a player with MM cartridge to the PHONO MM terminal and a player with MC cartridge to the PHONO MC input terminal Fig 3 If a grounding wire is provided together with the pin plug connect it to the GND terminal on the rear panel uu EE When the PHONO MM input terminal is not used never fail to use an accessory short plug so as to prevent a click noise at PHONO SE LECTOR switching Turntable Turntable with MM cartridge with MC cartridge Fig 3 PLAYING RECORDS STRAIGHT WITH DISC 6 SWITCH PUSHED ON THE LAMP INSIDE THE SWITCH LIGHTS records 1 Check the connecting cord 2 Place the PHONO SELECTOR switch in the
5. PHONES DISC SWITCH CARTRIDGE LOAD This is a unique switch to permit you to directly couple the superior DC equalizer and DC main amplifier of 1 by a single switch operation _ As shown in the block diagram Fig 9 when the DISC switch is ON when the lamp inside the switch lights the output signal of the equalizer has priority to other input signal TAPE PB TUNER AUX and is transmitted directly to the main amplifier over the tone control section Thanks to this the circuit is simplified enabling transmission of true signal to the speaker and at the same time ensuring simplified operation for record playing EQ Amp DISC 14 MAIN Amp INPUT om dq Y SIGNAL SERE E SPEAKER Kae E TERMINAL VOLUME DISC N SWITCH BASS TREBLE The input impedance of amplifier affects the fre quency response of MM cartridge while the most suitable load impedance of amplifier depends on the cartridge That is the frequency response changes considerably depending on the PHONO input impedance Refer to page 8 When inserting a cartridge load plug with the most suitable impedance for the cartridge into the CAR TRIDGE LOAD terminal of A 1 the most suitable response for the A 1 is obtained Also by chang ing a cartridge load plug according to your taste you can change the high frequency zone character istic Cartridge load plug Normally i
6. YAMAHA thanks congratulates you on your selection of the A 1 stereo amplifier This exciting amplifier is a great tribute to the audience by the YAMAHA engineers who are unique in that they combine the most modern electronics sound reproduction knowhow with the wisdom aquired over many years experience in the musical instrument manufacture A 1 embodies versatile functions a sophisticated circuit configuration and carefully selected parts disc switch arrangement particularly allows disc signals from the equalizer amplifier reach the power amplifier in a direct manner to achieve a new high quality in fine and delicate musical signals from disc grooves Here the A 1 justifiably claims to be a TRUE DC amplifier In order to obtain from your A 1 the long life of service it is capable of please carefully read this instruction manual Features DISC switch on the front panel allows direct transmission of all the musical signals from a disc to the speaker system When the DISC switch is on the equalizer and power amplifier are connected with the Yamaha s original film capacitor which is the only one in the signal path When the DISC switch is off it functions as a high quality stereo amplifier with the talented controls stored behind the sealing panel Careful selection of circuit elements and sophis ticated layouts contribute to the high sound quality reproduction The
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8. switch or TAPE MONITOR switch inside the sealing panel Refer to page 8 for the connection and opera tion of record player VOLUME Control This knob permits you to control the overall volume Turn it clockwise to increase the sound volume When turning ON the POWER switch always turn this switch fully counterclockwise 0 so as not to be given an indiscreetly large sound Arrangement of speaker system and furniture may affect the sound volumes of left and right speakers making them differ In such a case balance them by utilizing the front and inner parts of the knob which permit you to separately control the vol umes of left and right channels respectively RESPONSE dB Sealing Panel Switches and knobs which are not operated fre quently once they are set are put together inside this sealing panel It can be removed easily by a finger tip PHONES Jack One headphone jack is provided Plugging the headphone in does not mute the speakers so push the SPEAKER switch 5 5 Controi The zero position the center 0 is the flat con dition point This enables you to emphasize low frequency sounds rhythm section etc or to reduce them if your speakers sound boomy Turning to the right increases the bass response and turning to the left reduces it Refer to the Performance Graph below F
9. 101 SPECIFICATIONS Output Power _ Continuous rrns power 20 to 20 000Hz Q 0 2dB i ee MMP UPMM ULM MM UM oi Channel Separation at TUNER 709 5 1 Input 20 to 20 000Hz 89 70 70 watts at 0 0296 T H D Input Sensitivity Impedance 42 80 80 watts 0 05 THD _ PHONO MM 2 5mV 47k2 PHONO MM to Sp Out 7588 5 TKO Input 3088 PHONO to Sp Out 75dB shorted Vol 30dB 7 PHONO MC 6O0uV 102 N D C R PHONO MM to Sp Out 0 1 THD TUNER AUX TAPE 200mV 47k2 a M M Vo 20dB IHF A Network PHONO to REC OUT 20Hz 20kHz 8V output Maximum Input Levels at 1kHz 6mW to 70W er MU A PHONO MM 0 01 Headphone Output 39mW 8 rated power PHONO MC to REC OUT 20Hz 20kHz 2V output 230nmvV r m s AC Outlets 001 PHONO MC 0 01 T H D i SWITCHED 2 100W Max Totaly TUNER to Sp Out 20H2 20kHz 35 watts 7 _ UNSWITCHED 1 100W 0 01 Tone Control Characteristics Power Supplies 120V AC 60Hz IM Distortion Ratio 60Hz 7kHz 4 1 BASS 350Hz 10dB at 20Hz Dimensions WxHxD TUNER to Sp Out 89 35 watts TREBLE 3 5kHz 10dB at20kHz 435 x 117 x 381mm E
10. MM or MC position according to your cartridge f yours is MM cartridge insert a cartridge 5 load plug into the CARTRIDGE LOAD PLAYING RECORDS UTILIZING TONE terminal on the rear panel considering the CONTROL CIRCUIT BY TURNING OFF 6 most suitable load impedance of your car DISC SWITCH tridge or according to your taste You can obtain your desired tone matched 7 3 Push the POWER switch to supply power with your room the amplifier 1 Check the connecting cord Before turning ON the power switch turn 2 Place the PHONO SELECTOR switch in the the VOLUME control knob fully counter MM or MC position according to your cartridge 8 clockwise to the position f yours is MM cartridge insert a cartridge 9 4 Push the DISC and SPEAKER switches and load plug into the CARTRIDGE LOAD the lamps inside the switches will light terminal on the rear panel considering the 5 Start record play most suitable load impedance of your 10 SPEAKER SWITCH MC i 9 i MAIN AMP CARTRIGE SW O SPEAKER 11 E gt Te dep TUNER Q o Wien 7 T ADR Luo oe PRE OUT na UR id SP PROTECTION CIRCUIT PB You can enjoy high fidelity reproduction of 7 Gradually turn the VOLUME control knob clockwise to obtain an appropriate sound vol 3 ume When you wish to stop the record play turn the VOLUME control knob fully cou
11. with a program source according to the table below INPUT SELECTOR PROGRAM SWITCH SOURCE PHONO Record Audition TUNER Broadcasting Reception Playback from an equipment con nected to the AUX terminal PHONO SELECTOR Switch This permits you to match the A 1 with the car tridge of your record player Place it in the MM i position in case of MM moving magnet car tridge and in the MC a position in case of MC moving coil cartridge 1 First fully slacken the speaker terminal knobs by rotating fully to the left Strip about one half inch of insulation from the speaker leads and twist them together to eliminate stray ends preferably soldering them togeth er Fhen insert into the hole and screw the terminal knob tight 2 Make sure that you connect the terminal on the A 1 to the terminal on the speaker and the terminal on the A 1 to the terminal on the speaker A mistake here will result in poor bass response and ill defined stereo im age Also make sure that you connect the left hand speaker viewed from the listening posi tion to the left hand channel and the right hand speaker similarly to the right hand chan nel 3 Speaker system operates by the SPEAKER switch on the front panel s Tighten SPEAKER CORD Two PHONO input terminals are provided for MM and MC cartridges Connect a record player with MM moving magnet cartridge to the PHONO MM terminal
12. 35W output refer to Frequency vs Total Harmonic Distortion and damping factor over 100 1kHz 892 4 MC HEAD AMPLIFIER 1 has a built in MC amplifier which makes possible direct MC cartridge sound reproduction It presents as high low noise characteristics as 70dB or more at 60uV and a superior distortion factor of 0 0196 2V or less at 20Hz to 20kHz 5 TONE CONTROL CIRCUIT The tone control circuit comprises two stages the first of which is a FET differential amplifier i e the NF CR type amplifier featuring flat con trol characteristics The tone amplifier also acts as 10Hz 12dB oct subsonic filter This means that the TONE switch in OFF position permits by passing the control circuit and that even when the switch is in ON position flat charac teristics are available with the BASS and TREBLE controls in their center position The TONE switch accordingly allows subsonic filter s ON OFF 6 POWER CIRCUIT Two large capacity transformers are so arranged as to cancel each other s leakage flux in parallel connection Two units of large capacity electro lytic capacitors 18 000 carefully selected from a standpoint of sound quality are used for the power section Metalized Mylar capacitors 2 2uF in parallel connection efficiently check impedance increase in the high frequency range printed circuit board subject to a high current adopts 70 microns copper foil two times thicker than th
13. 7 2561777 TR2OA 25464402 TARZI TR213 28C198 EA 0 TAZIZ 28CH2IS TR IA 22AS673A TREIS 90529 0201 0202 151865 9202 0204 0205 i gt 0206 0206 0207 vni2iz Symptom Power is not supplied though the POWER switch is turned ON No reproduced sound is given though the INPUT SELECTOR switch is operated Sound through MC cartridge is low Turning the BASS or TREBLE knob does not effect tone control No sound is given through both or either of left and right speakers TROUBLE SHOOTING Cause Plug it securely The power plug is not securely inserted into the mains receptacle A fuse is gone Consult with an authorized Yamaha audio engineer The TAPE MONITOR switch is placed in the ON s position this case no program source other than tape playback is ef fected Therefore place the TAPE MONITOR switch in the OFF position except for tape playback The DISC switch lights ON condition this case no program source other than disc play is effected Therefore push the DISC switch OFF except when playing disc Sound fails suddenly during reproduction Reproduction lacks low sound and is un natural while the sound image is unstable The SPEAKER switch is not pushed ON The speaker system is not connected completely Push the SPEAKER swi
14. REQUENCY Hz Q TREBLE Tone Control The zero position in the center 0 is the flat dition point This works similarly for the high frequencies Sometimes turning slightly to the left to reduce high frequency response can cut out unwanted hiss noise or record scratch although turning too far will give an unnatural or muffled sound Turn ing to the right increases high frequency response to compensate for absorption by soft furnishings curtains etc Refer to the Performance Graph below left TONE Switch This enables you to cancel the tone control circuit With the switch pushed OFF the BASS and TREBLE knobs do not affect the tone control circuit Place the switch in the ON position to operate the tone control circuit MODE Switch This is a stereo monaural changeover switch The monaural mode is obtained in the MONO position and the stereo mode in the STEREO position This MODE switch does not function when the DISC switch is ON TAPE MONITOR Switch This permits you to monitor the playback signals of a connected tape deck In the ON position the playback from a tape deck can be made Place it in the OFF position except when playing back The tape playback can not be made when the DISC switch is depressed and the inside lamp lights B INPUT SELECTOR Switch This is a switch for selection of connected program sources Push a switch matched
15. als PB 4 LINEOUT RECOUT LINE IN REAR PANEL TAPE REC OUT To LINE IN To LINEOUT e P CECI E Tape Deck Push the TAPE MONITOR switch on the front panel to ON and the DISC switch to OFF switch lamp goes out To listen tape sound use the tape deck playback operation When you wish to make a recording push the INPUT SELECTOR push button AUX TUNER or PHONO of the desired program source and use the tape deck recording operation TAPE TAPE PB REC QUT To LINEOUT To LINE IN 2 4 GOO DECK 2 TAP PLAYBACK OPERATION RECORDING OPERATION Fig 7 TO TAPE DUBBING For tape to tape dubbing you will need two decks Connect recording tape deck LINE IN to the PRE OUT terminals of the A 1 rear panel and set the TAPE MONITOR switch to ON the DISC switch to OFF Note You can not copy to tape deck 1 from tape deck 2 Note The signals from the PRE OUT terminals which are recorded by your tape deck are influenced at VOLUME control of the A 1 Plug the headphone into the headphone PHONES terminal in the sealing panel Please notice that the headphone s left and right are rightly on your ears when using it Fig 8 If you wish to cut out the speaker sound simply press the SPEAKER switch
16. built in high performance MC amplifier consisting of Yamaha s original super low noise elements High operating characteristics backed by the design considerations which attach importance to N D C R characteristics under practical operating conditions Adoption of two massive power transformers so arranged as to cancels each other s leakage flux and of an also large capacity 18 000uF electrolytic capacitor The stable power supply section assures high sound quality due to careful design considerations The slim and elegant appearance combined with high operationability Contents Caution Read this Before Operating e ate 3 Connection Diagram 4 he Names and Functions of the 5 5 Connecting and Operating the A 1 with other Components 8 Disc Switch and Cartridge Load 12 ee 13 Circuit 13 Performance Graphs 15 ie aes 16 Block DiagraM ves 2 17 P 18 Trouble Shooting 19 IMPORTANT Please record the serial number of your unit in the space below Model Name 1 Serial No The serial number is located on the rear of the chassis Retain this Owner s Manual in a safe place for future reference CAUTION READ THIS BEFORE OPERATING YOUR 1 dH The 1 is a high performance integrated a
17. e ordinary boards greatly contributing to sound quality improvement 7 IMPROVED ACTUAL USE CHARACTERISTICS Improvements were achieved in overall charac teristics in actual use i e speaker reproduction of DISC FM and Noise distortion Clear ance Range N D C R is rated at 6mW 7OW 0 196 distortion VoL 20dB 1HF A Net Work from PHONO to SPEAKER OUT Refer to N D C R characteristics Rejection ratio of ex ternal noise is also superior PRE OUT and REC OUT terminals are designed for low impedance of 60022 which is advantageous when long shield ed cables are used Elimination of a balance volume has contributed to decreased volume impedance resultantly improved noise and distortion characteristics in actual use N D C R is an abbreviation of Noise Distortion Clearance Range N D C R presents overall characteristics covering from PHONO inputs to SP OUT terminals at maximum volume through 40dB with 1kHz signals The measured values reveal that distortion and noise components have been eliminated in actual use for example reproduction at VOL gt 30dB and at 5 70W output such components are rated at merely less than 0 002 PHONO MM SP OUT DISC ON 1kHz A network FRSA SUE M Li i I MBE DIL S ar n
18. iginal super low noise dual FETs in current mirror differential amplification and its output stage uses a transistorized Class SEPP in a DC amplifier where no capacitor is used in the input circuit nor electrolytic capacitor in the NF circuit This equalizer exhibits low noise ability of 85dB SN ratio 2 5mV and low distortion factor of 0 00596 or less REC OUT at 20Hz to 20kHz What s more its distortion factor remains superior against impedance increase in the high frequency range of a cartridge connected to Input The CARTRIDGE LOAD plug further permits to set the optimum impedance for each cartridge to use Refer to P 8 3 MAIN AMPLIFIER The A 1 s main amplifier is designed for input sensitivity of 200mV higher in gain than ordinary amplifiers It s circuit configuration consists of Yamaha s original low noise dual FET differential amplifier circuit in the first stage gt Pre drive stage of current mirror load differential amplifier circuit gt Emitter follower buffer amplifier gt Darlington connection SEPP OCL DC amplifier The combination of carefully selected dual FETs with the sophisticated circuit configuration parts and parts arrangement has reduced thermal and time drift to a possibly minimum at medium voltage which is an important problem a DC amplifier has to cope with Its characteristics are so excellent as residual noise 5 or less DISC distortion factor 0 01 or 1655 20 2 to 20kHz
19. ing panel func tions similarly to the DISC switch But while the DISC switch effects a priority of record play to other program the TONE switch cuts off the tone control section making the circuit simplified when the DISC switch is OFF Fig 11 When tone control is required place this switch in DISC SWITCH e e n A ES SPEAKER uS TERMINAL pP 1 E 3 INPUT SELECTORS g MOPE PHONO SWITCH OFF 7 4 H ST MA ALPINE ertet LEE TUNER AUX 6 9 RECOUT TAPE BASS TREBLE Fig 11 CIRCUIT EXPLANATION 1 CIRCUIT CONFIGURATION The DISC ON circuit configuration is such that the equalizer amplifier directly connects with the main amplifier i e Low noise MC head amplifier DC equalizer amplifier gt DC high gain main amplifier And when DISC switch is OFF Low noise MC head amplifier DC equal izer amplifier gt Tone control amplifier gt DC high gain main amplifier Not only each amplifier unit is bestowed with improved characteristics in all distortion ratio crosstalk SN ratio and transient characteristics but also the overall char acteristics of the whole amplifier is upgraded to a large extent as is obvious in its RIAA deviation characteristics and N D C R characteristics 2 EQUALIZER AMPLIFIER The equalizer amplifier adopts Yamaha s or
20. mplifier with low distortion and high out put power This manual is required reading if you are to get the best from its special features and controls Do not drop or otherwise jar the A 1 which Is a precision electronic instrument Do not place the A 1 where it will be ex posed to direct sunlight excessive heat for instance over a radiator cold moisture or dust Do not use chemical solvents such as ben zene or alcohol to remove traces of dirt Wipe only with a soft slightly damp cloth Do not attempt to carry out internal adjust ments or repairs Leave these to your local service representative Do not assume your is faulty before checking the Trouble Shooting list on page 19 for common operating errors Operate all switches and knobs in accordance with the instructions Avoid applying undue force which should never be necessary and do not attempt to use intermediate settings Note that the muting circuit keeps the A 1 silent for several seconds after switching ON to prevent the pops and clicks that can oc Cur Do not connect other audio equipment to the spare AC outlet sockets on the rear panel if they will require more power than the out lets are rated to provide Keep this manual in a safe place for future reference and refer to it frequently until you are perfectly familiar with all A 1 con trols and functions CONNECTION DIAGRAM Speaker System When co
21. nnecting make sure of the right and left channels as well as and polarities Other audio equipment EARTH BPEAXERS 4 100 4 Other audio equipment Connect a cartridge load plug when using cartridge BIVER To AC Socket To LINE OUT mi tma D 7 i SORTII AMAHA i SM OOO Turntabie Turntable with MM cartridge with MC cartridge SOON DEM e a dpa Mic Mixer Amplifier Tape Deck Power Amplifier Another Tape Deck THE NAMES AND FUNCTIONS OF THE PARTS 20 YAMAHA 5 120VOLTS 450VA 60Hz HAMAMATSU JAPAN Ground GND Terminals This GND terminal is provided for grounding turn table units etc Please make sure that all such units are firmly grounded failure to connect the ground leads can result in unpleasant hum Refer to page 8 for connection PHONO CARTRIDGE LOAD Terminals These terminals are provided for connecting an accessory cartridge load plug which is matched with the impedance of your MM cartridge Refer to 8 for connection PHONG M lt v Terminals These terminals are for connecting turntables using MM moving magnet cartridges PHONO MC Terminals These terminals are for connecting a turntable using an MC moving coil cartridge The upper terminal is for the lef
22. nsert 47kQ2 plug In this case the input impedance of amplifier becomes 47kQ When 68k amp 2 plug is inserted the input imped ance of amplifier becomes 68 O When no plug is connected to the CARTRIDGE LOAD terminal the input impedance of am plifier becomes 100k22 If you want to set an input impedance other than 47kQ 68kQ2 and 100k 2 you can cal culate the impedance of cartridge load plug from the following formula and the graph shown in Fig 10 Impedance to be applied 100 x desired input impedance 100 desired input impedance Unit k amp Example If 33k 2 input impedance is desired 100 x 33 100 33 49 3 0 Use a resistor with an approximate value to the calculated If the most suitable load impedance is 1QOk 2 the cartridge 1088 impedance is infinite of desired cartridge m 2 e 9 m a u 2 en gt Cartridge load impedance k 2 SWITCH the ON position and control the tones of low and high sound zones by turning the BASS and TREBLE knobs Also the tone control section has a built in subsonic filter If a warped disc or other causes an unsteadiness of a cone paper of spaker in the ultra low frequency place this switch in the ON position and the BASS knob in the O position and the tone control section will oper ate as a subsonic filter The TONE switch inside the seal
23. nter clockwise to the position and stop the record player switch to turn OFF power BENE Record playback signal when the DISC switch is pushed ON E Record playback signal when the tone control circuit is used before pushing the POWER 4 tridge or according to your taste Push the POWER switch to supply power for the amplifier Before pushing ON the POWER switch turn the VOLUME control knob fully counterclockwise to the O position Push the PHONO button of the INPUT SELEC TOR switch Make sure the TAPE MONITOR switch is placed in the OFF B position Push the SPEAKER switch and the lamp in side the switch will light Place the MODE switch in the STEREO I1 position when playing a stereo record and in the position when playing a monaural record Start record play Gradually turn the VOLUME control knob clockwise to obtain an appropriate sound vol ume Make sure the TONE switch is placed in the position With the TONE switch placed in the OFF position the BASS and TREBLE control knobs do not function Turn the BASS and TREBLE control knobs to obtain your desired tone The characteristic is flat in the position When you stop the record play turn the VOLUME control knob fully counterclockwise to the position and stop the record player before pushing the POWER switch to turn OFF power POWER GPEAKER d Li E
24. t channel the WARNING TO PREVENT FIRE OR SHOCK HAZARD DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE CAUTION DO NOT REMOVE THESE SCREWS SEE BOTTOM CAUTION PAS ENLEVER LES VIS LIRE LES INSTRUCTIONS DESSOUS DE L APPAREIL PRE OUT SPEAKERS 4 36 SPEAKER 4 18 HAUT PARLEUA APE REC DUT 9 lower for the right The same is true for all the other pairs of terminals Refer to page 8 for connection TUNER Terminals These terminals are for connecting AM FM tuner Refer to page 10 for connection AUX Terminals Use these terminals for connecting an 8 track tape player mic mixer amplifier or other item of audio equipment etc TAPE PB 5 REC OUT Terminals Connect the TAPE PB terminals to the tape deck LINE OUT terminals and connect the REC OUT terminals to the tape deck LINE IN terminals Refer to page 11 for connection PRE OUT Terminals These terminals are for connecting the signal out put of A 1 to another power amplifier or tape deck AC QUTLETS LANSWITCHED SWITCHED 180v 190W MAX e 120 80Hz COW MAX TOTAL 7 AT i Q SPEAKERS Terminals These terminals are for connecting one set of speaker system Refer to page 8 for connection AC OUTLETS You can plug in other items of audio equipment Two sockets are switched by the A 1 POWER switch They are suitable for tuners and other low power
25. tch ON Connect the speaker system securely The pin plug of input terminal is not inserted securely Plug it securely Connect it to MC terminal If the DISC switch lights the tone control circuit does not func tion Therefore turn OFF the DISC switch Place the TONE switch the R position The output cord of MC cartridge is connected to MM terminal The DISC switch lights ON condition The TONE switch is placed in the OFF a position Make sure of the secure connection Push the SPEAKER switch to light the lamp inside the switch Set the indexes of the front for left speaker and the inner for right speaker of the VOLUME control knob correctiy Connection of speaker cord s is imcomplete The SPEAKER switch is not pushed ON The L and R of VOLUME control knob is displaced An alternate current of over 2V flows to the speaker output terminal making the speaker protection circuit function Upon the voltage becoming OV a relay operates to connect the sound circuit Turn OFF the POWER switch and turn it ON again after a while Consuit with an authorized Yamaha audio engineer Re connect matching the phases amp correctly The power fuse is gone Phases amp of speaker are incorrect YAMAHA NIPPON GAKKI LTD HAMAMATSU JAPAN
26. units requiring up to 100 watts The other one is unswitched and can only deliver a total of 100 watts Do not exceed the maximum ratings AC Power Cord Plug the A 1 power cord into a mains power supply wall outlet socket 5 5 PHONES POWER Switch Push this switch and the A 1 will be supplied with main power and a lamp inside the switch will light Push again to turn OFF power The speaker does not sound for a few seconds after the switch is turned ON This is because a speaker protection circuit functions to eliminate poping noises which may be given when the switch is turned ON Before pushing ON the POWER switch always place the VOLUME knob in the minimum posi tion fully counterclockwise 0 so as not to be gain an indiscreetly large sound SPEAKER Switch Push this switch and a lamp inside the switch will gt E E om OFF i a E STEREO MONQ TAP MO TOR LU PHONG TU MODE INPUT SE LECTOR o light and connected speakers will operate Push again to switch OFF the speakers DISC Switch This switch permits you to give a priority of disc play Push the switch and a lamp inside it will light and the A 1 will reproduce output signals of a connected record player prior to those of other program Push it again and the A 1 will return to reproduce the program selected by the INPUT SELECTOR

YAMAHA A-1 Manual

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