SERVICE MANUAL
Contents
1. ALIGNMENT TEST POINTS i gt VReot TC10a VReo2 Ten veo Lar s m 2 D 1 4H g Me a 0 gt Dn 17 TPao 2 2 up 2 203 2 2 TPao io ALIGNMENT FM ALIGNMENT PROCEDURE NOTE Toalign set tbe signal generator level to turn tuning gang fully center carr pointer to reference mark wave and set muon aenenaron rero Answer 1 IF Trans 10 7 MHz Sweep signal is Oscilloscope is Primary and Best LF former 200kHz Sent to connected to d wave form the and ceramic capaci TPs via the tor OOF ceramic capacitor 2 107 Mtl Sweep signal is Oscilloscope is FM S curve 200kHz sentio2A connected to Discriminator via the 0 024F 2C via the Tos primary ceramic capaci 0 05 and secondary tor capacitor 3 OSC Toamenna 88MHz O S C coil Maximum 400Hz1005 terminals and Ls Modulation at output load 4 OSC 108MHz Toantenna Oscilloscope 108MHz O S C trimmer Maximum 400 Hz 100 terminals and V2. 2871 6 27 22 IN34AL Y Rey a i ds 8 gt 3 _ 28 1 6 i E Raye 474 Ns e o9 3S 28C733 Y 2 4 wa min A an 4 40 m mO E SHO A INDCATOR SV OMA F 12592 hee 2SC929 E Ry 2SC929 E 25026804 F 1241 MN 837 2808936 2506893 if Teo SELECTOR 5 aj 1 PHONO Sn SPEAKER LOF 3 8 4AB Son MONITOR 11 108 Stosa MONITOR 2 LOFE MODE Ss STEREO Scarsa LOUDNESS LON 5 HIGH FILTER Torr Se ANTENNA 1 DISTANCE 5 MUTING CAPACITOR RESISTORS WATT f oiL UNLESS OTHERWISE NOTED European type MYLAR X VOLTAGE AND CURRENT CHECK of power supply cirit TANTALUM CIRCUIT METER 1V 20K82 STYROL 0 INDICATE ONLY THE STEREO ver m CERAMIC TUNING ACT MICA nora GREEN 21 BLUE IA EJ d HEAD PHONE JACK 21177 B8 GND BK BI 86 BC BC 80 57 4 7 E L ORANGE 5 0 YELLOW O 3 UUUUUUUUUUUUUUU UU U ser 0 16
3. 12 ALIGNMENT AM ALIGNMENT PROCEDURE NOTE To aligh set AM Signal Generator level to minimum ster auon ADJUST ADJUST FoR 1 hr rm Antenna Oscilloscope Primary and Bost LF Trasfor 30kHz terminals and V T V M is secondary sides wave form mer Sweep generator connected to TPs from the Ist OSC AMugenerator Antenna Oscilloscope O S C Coil Ton Maximum terminals and V T 0 M at 400 Hz 30 load Modulation 3 OS C AM generator Antenna Oscilloscope 1400kHz O S C Trimmer Maximum 1400 kHz terminals and V T V M at TG load Modulation 4 Repeat 2and3 5 Antenna AM generator Antenna Oscilloscope 600kHz Ferrite bar Maximum circuit 600 kHz terminals and V T V M at Antenna coil 400 Hz 30 output load Modulation 6 Antenna AM generator Antenna 1400kHz Antenna Maximum circuit 1400 kHz terminals and V T V M at circuit 400 Hz 30 output load Trimmer TC Modulation 7 Repent Sands IF CHARACTERISTIC 1 CURRENT ADJUSTMENT 2 QUTPUT ADJUSTMENT SENG wither WAHTTODO NOTE STEP WHAT TO DO NOTE PESTER fences and Fu Use an am Adjust the volume meter having control to minimum 2 Set VR and 100
4. canos 18 Dan 0310400 18 an Des ooa 14 can p censos 14 Rar 20 Das 0310401 1A son estao 14 nn Te ane con sto 18 we dan 2 Gi 14 nn 2s Rar 224105 10 MW Carbon Resistor 28 La Coll 4240890 2C Ras len Micro Inductor 4900100 1 22 Ras Colt 4240410 2C Ra en vn n an 2A ma ae 200 0 8 Indicator 1032180 28 689F 10 50 WY Ceramic Capacitor 1C n 10 WY Capacnor 1C 5 50 WY Syro Capacitor 1C 0 02244 10 50 WV Capacitor 18 47606 5 50 WY Siyrol Capacitor B 50 WV Capacnor 28 nf 25 WY Capac 1C p ac 22006 5 50 WY Capacitor 2C pu x 1A BEL 14 E MD 0180 so WY WY 35 16 PRINTED CIRCUIT BOARDS AND PARTS LIST Parts No Y Lz Y z wa oe pu R won 20 Cm ooz EN 25 WV Ceramic 1 28 R 10 Ca Capacitor 3 20 en p 50 WY eripe 1 2
5. PRINTED CIRCUIT BOARDS AND PARTS LIST TONE CONTROL BLOCK lt F 1240 X Parts Nc x Y 2 Y z sun 1 ww Ra san eu p Rm ev 18 Ros wa 4796 210 50 WY ie 18 on E Rr san cm Capacitor 18 en 1 Cm saw 25 WV Electro 1A Ro on ac Capacitor 18 Cus 0024 10 50 Myler 1 ze oma Copocior 18 Ana 28 28 Tw ID tm E Tee man ae zin 2 Tim YA sun E Tee mos Ru NUM 10 KW Carbon 18 Ro 28 Rm 24 8 wan 28 un 124 28 wa xn 1A wa wr 1 Wa wan san n san n son n sen 18 Ro n an n wu 1A 18 Rw amp un Re emn 18 250XSM AN Balones Control 101040 2 Vias 100008 2 Treble Control 102004 28 100 8 2 Boss Control 102000 2A Cm 10 SD Ceramic Capacitor 2c 210 SO WY Mylar 1 Capacitor 1 E ve WY Elverolyiie 10
6. Vien Ree E Cros Car can 2000008 AC Balance Adjuster 103015 IKB DC Balance Adjustor 103049 lone E do er oz 102065 103015 10 50 WY Mylar Capacitor 25 wv 10 25 WV VA so wv Capacitor 18 saw sw 18 10 50 WY Mylar Capacitor 2A 2109 50 WV Ceramic 1 Copocior 14 4109 50 WV 1C e 21 OTHER PARTS AND THEIR POSITION ON CHASSIS aris No Y Parts Name Y x Y ran TES Rost sn 10 Carbon Resistor Fuse 220 250 043003 2 5 ee poro com 549 Me ma ded ruis AA ne Bs We ito Rus Toor 780 300 High Frequency Transformer a Roo 20 Ten 220 M AM Bor Antena 420031 m me 12 om im em oma cios 1W Metal Resistor Rora 5600 210 Ma Cota tae Via lir on 385 25W Comic Ca same Em 22005 am Copocitor m LAE E Er Co
7. ve Capacitor ev 25 WV 1 Cw Capacitor 28 20 mr 28 Cm 00015 28 Cm Y Mme 2 eser 24 Cw PRINTED CIRCUIT BOARDS AND PARTS LIST EQUALIZER AMP BLOCK F 12415 x Y Lz x Y z m 2 an on ic Ran 15 WY Tomaigne pes x 82 owe Ut Eas ie 16 Ce 15008 10 50 WY Coromie 28 je n cm E we 3 eme FE Ce 15091 210 50 wv Corome TA We sen asocio 1A we n 5 am freie 28 Rm cor Soe 18 we H un Ras 5440 210 JEW Carbon Resistor 2A 28 Motel d we san n WY Beevolyie n 28 E o 2 SEEN we en cu ws Ia we san n 10 50 WY 3 Car 0003094 2 we 24 ce asma Corner 28 gt e Car ic wa 23 n The n 2A Ther ascenso N ascori Ras won The Se 8 Self S d 2 2 1 BERRIS g Ge R620 C 5 1 8621 1 619 jm 9 2 e kz 09 1
8. T V M Modulation at output load 5 Repeat 3 amp 4 6 RF Amp To antenna Oscilloscope 90MHz Antenna Coil Maximum Circuit 400112 100 terminals and LA LR and Modulation at output load LR 7 RFAmp 106MHz To antenna Oscilloscope 106MHz Trimmer Muximum Circuit 40042 100 terminals and Mottin at output load 8 Repeat 6 ay FM IF CHARACTERISTIC FM DISCRIMINATOR CHARACTERISTIC FM MUITIPLEX ALIGNMENT PROCEDURE 1 Do not attempt to align the Multiplex Circuit unless the following equipment is available Multiplex Stereo Generator b Oscilloscope AC V T V M 4 Audio Oscillator e FM Signal Generator see mon GENERATOR FEEDSIGNAL ener MT L hohe Trap Comento _ 14 Minimum Signal 4 46 2 y la Minimum Siema Ds a Signal Gen Amena V T VM and Maximum dome Maggies Som ermes aipa st BY STEREO Tune to signal ll EM Signal Gen VT VM amd 7 Maximum Transformer terminals Oscliloseope at by STEREO Gen Tune to signal 4H s FM Signal Gen Antenna V T V M and Channel R Modumed O Minimum by STEREO Signal Tune to signal ouput ead channel
9. 093 19 LIPPLE FILTER BLOCK F 12465 x Y Lz 210 3w Conen temor 18 Wo 210 MW Cottae 18 Row n 2105 Jew Sota tenor 18 Wu ana 1 1 Ro ein 210 KW Corben tenor we Im on 1 16 WY pm M E Cmon Ce ens Co 26 WY m Cm Ge fr so wy Coane Co 330pf Electrolytic 100p Capacitor 1A tren 0 18 Tien 2300710 6053 1 14 co 14 D oor too 330 pas n 330 zow men ose 18 POWER BLOCK F 12515 x Y z Roo 108 MW Carbon Resistor 1A 0 0047 10 amp 00WY Oil Capacitor 1A 8 Cm 2 75 Electrolytic Capacitor 10 WY Electrolytic 18 Cm SOOWV Ceramic 1 Capacitor Ther 250627 13 020558 1 2 Der 0062 031080 Dom 01080 1 Dos 10005 0310880 PRINTED CIRCUIT BOARDS AND PARTS LIST Parts No FM MPX BLOCK lt F 1239 1E x Y z Y z m n Te 16 emo 28 Ren 1 Theo 0305732 3 28 Reve 1 Trees 250733 0305371 28 Ras 1 25 735 Y 0305640 1 1 28 E Rar
10. 8 20 Roos san 10 ee 25 WY Ceramic 28 Cw 20 Cm 210 o WY Cerone 00013 Re nn Cm mer 10 WY 2A Ran m ac Copocitor m e A Cm omes Car tm a poster mn Cm Lr 10 16 WY Bene 10 Ras an Copacitor Rar nn Cm 10 Raw Cus 5 1 Cm 002 an Car 210 ic Rar 108 KW Carton Cm ET Em ic wa 2 Cm n 24 20 m Ras nn TN Re 1 Rm own 1A n Cm 1A in s0 WY 1 Ren on Cose Ran aue gw NO RA zn Rm e 2508290 20 n Tem 20 mA Tha 250820 Rm 250820 Mac n Tem 258020 jan Row ann Tio 28CB20 C 18 Sea Ts vA o 1C Visi tina 10302 18 088 1008 Mating Adpar 103034 neo Das osan Cm 10 m mur ED oe 10 m unsa 3 NA 2 Tm 28 AB as wv E Ta On
11. C motor source Install an outdoor antenna and Natural phenomena such as ground the amplifier to raise the atmospherics statics Signal to noise ratio aoe Reverse the power cord plug Insufficient antenna input receptacle connections due to ferroconcrete wall the noise occurs at a cert long distance from the a station S m inch wave trap to the Wave interference from Keep the set other electrical appliances from other electrical appliances Receiver is located in Place the set to receive m weak signal area signal strength Regional difference in field The unit is not at fault meter diverges much intensity reception A Noise heard at a Due to the nature of AM Install the antenna for maximum particular time of a broadcasts antenna efficiency See ANTEN day in a certain area in the operating epo over part of dial In some cases the noise can eliminated by grounding the ps fier or reversing power cord plug receptacle connections B High frequency noise Adjacent lt hannel interfer Although such noise cannot be ence or beat interference eliminated by the amplifier itis ivisable to adjust the doeet 109 close to audio from midpoint o left and Switch on the HIGH FILTER Keep the TV set at a proper distance from the audio sy
12. NG switch on It reduces the sensitivity and therefore it should be used sparingly Install the antenna for maximum antenna input Switch on the HIGH FILTER and or turn the TREBLE control from mid point left blinks on and off even though stereo station is not received B Clearness of channel Excess heat Circulation of air important to the Separation isdecreased amplifier Be sure that air owing during reception tinder the amplifier C The stereo indicator Interference The indicator is not at fault Adjust blinks on and Vir D The stereo indicator Interference The indicator is not at fault Adjust Record playing or tape playback A Hum or howling Record player placed direct on speaker Wire other than shielded wire used Loose terminal contact Shielded wire too close to line cord fluorescent lamp other electrical appli Nearby amateur radio sta tion or TV transmission antenna Place a cushion between the player amd the speaker box or place them away from each other The connecting shielded wire should be as shord as possible Turn the BASS control from midpoint toleft Consult the authorized SANSUI Service Station B Surface noise Worn or old record Worn stylus Stylus dusty Improper stylus pressure Worn playback head Switch on the HIGH FILTER and turn the TREBLE control from mid
13. SERVICE MANUAL SOLID STATE AM FM STEREO TUNER AMPLIFIER SANSUI ELECTRIC CO LTD CONTENTS GENERAL TROUBLESHOOTING CHART CUSTOM MOUNTING DISASSEMBLY PROCEDURE BLOCK DIAGRAM ALIGNMENT SCHEMATIC DIA PRINTED CIRCUIT BOARDS AND PARTS LIST 17 18 19 20 21 22 23 24 25 26 27 28 PARTS AND THEIR POSITION ON CHASSIS 9 10 11 12 13 14 15 16 29 30 GENERAL TROUBLESHOOTING CHART If the amplifier is otherwise operating satisfactorily the ponent be sure to read the manufacturer s instructions more common causes of trouble may generally be at 3 Improper location of audio components The proper tributed to the following positioning of components such as speakers and turn 1 Incorrect connections or loose terminal contacts Check table is vital to stereo the speakers record player tape recorder antenna and 4 Defective audio components line cord The following are some other common causes of mal 2 Improper operation Before operating any audio com function and what to do about them PROGRAM SYMPTOM PROBABLE CAUSE WHAT DO AM EMorMPX A Constant or intermit Discharge or oscillation Attach a noise limiter to the electri reception tent noise heard at caused by electrical appli cal appliance causing the noise or times or in a certain ances such as fluorescent attach it to the amplifier s power area lamp TV set D
14. cor 1070 2A Tua PM Mater Trontormer son 18 Cw sm as wv cum 2 Care nc 12 PRINTED CIRCUIT BOARDS AND PARTS LIST AM IF BLOCK F 12592 x x Y z x Y z ron 120 Cm 25 WV Coronie Capacitor sen 1 16 WV 28 2c Capacitor we 2 Cm der 200 509 Come 28 6 ta 28 0 Copoctor Rer Tim 0 020972473 1 we ann 256929 0 0208722 2 wo ma 25929 C 20821 2 18 we ann ze asc CD 03057243 1 wn A Taws 26 7 020507 2A Mm 2804 410 JEW Cortontesitor 18 we ama De 124 De 24 me we m u Tw cara si e 423090 1C Fe A aan 18 ET 423020 1 ann 1 me as AM IFT assi 1 wa 1 anna 28 Co oo 10 0 WY Mylar Copactor con fix as wv on 10 WY Cm Cm Mw Cm 10 so wv Cw E as wv 118 Ow Copecitor 1 28 Cm 16 WV tea
15. or to minimum range 2 Set an oscillator to The oscillator used 1 000Hz and connect should have the oscil E Set and it to the LEFT AUX lation frequency of 20 VOLUME to mini input to 20 0002 and the mum output voltage of more than 200mV 4 Push the POWER Be sure to switch ON switch on Ist Set other controls and and then con Switch to AUX switches as follows 5 100mA Connect the ammeter ncet the am range 10 Fun as illustrated meter in Fig 1 6 Turn clock wise and adjust cur rent to 15mA 7 100mA Push be POWER switch OFF and at 4 tach Foo in place capacitor of Push the POWER than 50 watts to the Switch ON and con LEFT SPEAKER nect the ammeter output illustrated in 8 scope to th 9 ER terminal wise and adjust cur rent to 15 6 Push the POWER switch on and ad 10 Attach Fes in place volume little Check the the terminal ms of the oscilloscope 7 Adjust VRan so that ibe fronts of sine wave are clipped sim ultancously Adios the right chan nel as above In Step TE 7 adjust SCHEMATIC DIAGRAM mur umm EOD u pe 12052 14771 he m TR 001 me Bj 7525082900 25082860 25082910 IN34Ax2 2SCTH Q s CN i ro ry 5
16. point to left Clean or replace the stylus Replace the playback head stereo Programs S alid wies sel Fide Sound comes from left and right channels Itis important to adjust for equal sound from both channels It should not always be set to the mid point Set the MODE switch to MONO and then set the BALANCE control io a position where equal sound comes from both channels CUSTOM MOUNTING How to Install the Amplifier in a Wooden Cabinet 1 Make a cabinet window of 392mm or 1577 in width and 110mm or 4 Ju in height 2 Place two square pieces of wood 20x 20x 210mm x s x 874 for supporting the amplifier in the bottom board of the cabinet 3 Cut two holes four attachment bolts in the bottom board of the cabinet 4 Remove the amplifier from the wood case Refer to the section entitled DISASSEMBLY PROCEDURE 5 Place the amplifier in position through the cabinet window 6 Make sure the amplifier is in position then put the washers in butterfly bolts 4x 40mm and the amplifier to the cabinet with the butterfly bolts Note When the amplifier is built into the custom cabinet the wood case assembly including screws and washers is not used Retain it for future use DISASSEMBLY PROCEDURE REMOVING THE FRONT PANEL WOOD CASE AND BOTTOM PLATE BLOCK DIAGRAM
17. se 28 ERB 25 WY Cerone 28 16 WY Emol 28 Capacitor Cos ER WV Ceramic Capacitor Cue 10 WV mylar Capaiter 18 Ov oo am Qu Soeur SBN 25 WW come 114 18 Cw oo etos er Con 14 389 sov Ceramic Cm ERa 25 WV Capacitor Ecole 2A Capacitor 2 PRINTED CIRCUIT BOARDS AND PARTS LIST DRIVER AMP BLOCK F 11804 ts Name 2 Position of Parts x Y 2 x Y m EET m 1a mw 116 1 saw lec san n Wu mw In Yan n Cm emot Hyer Cope 26 aa oo n te EIE KW Coton tuii cu m 50 WY Ceramic san m 26 va E ERE 5 as EE Pn EA cuota rm PEN 2 tenet 24 0 EN an 198 Kw EN Tes m A zan vac To mano xs rac terete me aake eneattaa 26 sun p ina po van mon mn TER Popp Corton he
18. ss 0 0047 pF one Com 0 068 pF Wem M Coo 0 068 pur EWERAN Tunas m poor PE FE necne me Se Speaker Selector Switch Y 1 4 4 110121 Be ie Been pend 8 fue M rta 8 nang he es inne cani won o pes pu P rimas pem Sous 29 Design and specifications subject to change without notice for ou 2 PLoos PLoor PLoo PLooa PLoio Rog os2 Foos Coss PUooi Fooi
19. stem FM reception A Noisy Poor noise limiter effect or Install the antenna supplied for too low S N ratio due to maximum signal strength insufficient antenna input If this does mot prove effective use an outdoor antenna designed Note FM reception is affected considerably by exclusively for FM When you use transmission conditions of stations power and TV antenna for both TV and FM antenna efficiency As a result you may receive with a splitter make sure TV recep station quite well while receiving another tion is not affected poorly An excessively Jong antenna may cause noise PROGRAM SYMPTOM PROBABLE CAUSE WHAT DO FM reception contd reception B A series of pops is heard tion noise caused by an automobile engine Install the antenna and its wire im proper distance from the Toad or raise the antenna input as described above C Tuning noise between stations Noise heard during reception while not heard during FM mono reception This results from the nature of the FM reception As the station signal becomes weak the noise limiter effect isdecreased and the amplifi cation of the limiter in turn enlarged generating noise Weaker signal because the service area of the FM MPX broadcast is only half that of the FM mono broad cast Turn the MUTI
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