SERVICE MANUAL
Contents
1. 122 1000P ADJUST D26 4700P 62 3 07 RI35 2730 VRO3 100K q 2 29 R54 05 R55 12 R53 30V sse 1K S 79 c32 110V 220VAC asv 3001 1 50 He 20 19 18 17 16 5 13 12 A o Ey 1c o2 v 87 sav ie 3 1 g 2 3 4 5 6 7 8 9 10 2 za C87 R35 rcd Sch 22 R45 ToS A cao ght C107 R39 R42 560 3 3 50 2 46 aTo te T Tr MY W Hw ad msc zi 220V Y R40 R4 R43 RAS 2 2K 1 Der LOS 330K 10 330K 10 FM ipid FM CENTER 027 39mH 7 A FUSE 05442 cas aA SEPA T400mA e ADJUST T CONT Hit Ez 8 UE mse oso R38 R IB 46 131V 100K R46 35 550 3 3750 VOLT SELECT Rize m 3 POWER TRANS 004 R150 Q06 08 37 DS135 05442 K 254608 swo Q05 07 38 005 250400 280325 POWER Sw 250536 x3 6246 22 004 10K 1 5 9v 9 02 13 1V 89 gt t dn Q27 M E 9 98 eeu 100 16 2SA608 06 30v Avr 595 216 47 10 470 RSS ROT 12 9v J 14 1090 cos t 927 2 7K 100 10 507 y pua 104mV M 5 K 3 0 024 Li 33k 938 e a GZA2 0Z R942. 918 021 024 25 92223 26 ar 024 250536 X4 254608 x2 256536 x3 924 025 7 R103 Q28 29 7V 2 7K 2501012 x2 182V EE 17 R100 2 7K 187V Dot R98 lt BAIOC 33K R101 j 022 2 7K R99 06 33K 923 092 2 R156 940 33K 4 lt 7 ame Fare T ES or 039 TD6301AP 020 05442 Lal O31 32 I 256536 x2 PRODUCT SAFETY NOTICE R120 33 R159 1 SUR Each precaution in this manual should be followed during servicing Compo Tk 039 40 nents identified with the IEC symbo 05442 x2 in the parts list and the schematic diagram designate components which 7922 7 safety can be of special significance When replacing a component identified Zoka n neh with use only the replacement parts 3 2 designated or parts with the same ratings of resistance wattage or voltage that are designated in the parts list in this manual Leakage current or resistance measure 1 4d d d dmm TE T Telcel c ments must be made to determine that exposed parts are acceptably insulated m em DIGITRON SS from the supply circuit before returning TUNING MUTE the product to the customer M 5 1 All resistors values are indicated in 103 109 FUNCTION SW ST MUTE Signal Stereo L E D ON 2 capacitors values are indicated in 10 d The values in bracket
3. R15 js R16 c20 7 EOF OUT C18 T R12 R13 Tw R14 Q04 2 212 F1 F2 FM TUNER ALIGNMENT FM ALIGNMENT Function switch to FM STEREO Note It is almost unnecessary to adjust coil in Front End as parfectly adjusted DIAL ITEM GENERATOR SETTING INDICATOR PROCEDURE Note The FM IF circuit utillizes a non turnable ceramic filter which establishes the IF bandpass To insure symmetrical Tuning and selectivity the IF must be aligned precisely to the center of the filter bandpass rather than to 10 7 MHz as in conventional LC circuits 1 SCURVE ALIGNMENT Connect 10 7 MHz Sweep Generator Adjust FM DET TO1 so that S wave form becomes sym Position of non interference Connect gene scope input to output to 1 and ground lead to chassis Use 5 pF capacitor in series with generator lead TPOZ metrical DETECTOR ADJUST MENT MINIMUM T H D Connect FM RF gener ator to FM Antenna terminals Set generator output level to 60 dB at 98 MHz 2 kHz Front Panel DIGITAL Counter Display Set to 98 MHz Harmonic Dis tortion Analyzer to TUNER output Adjust FM DET TO2 for minimum gain and best linearity Connect DC VTVM across 2 and 4 Adjust 2 until DC VTVM reads 0 V AGC ADJUST MENT Same as above Same as above Connect DC VTVM to Front End AGC termi nal and ground lead to Chassis Adjust until DC VTVM
4. e Tuner FMT M15L f Amplifier M15 Tous 1 9 wall outlet SR SE 7 1 Cassette deck RD M15 gS SSS EEE 7 SCALAR TD6104P SIGNAL FLOW AM RF IF IC LA1245 SIGNAL FLOW IF Vec SIGNAL D 3 L OUTPUT Hi k 12 11 IF GND AGC BUF DRIVE 4 DET IFT I zs To IF Vcc 754 9 c36 m 22 16 100 16 3 R36 22 C30 470 16 T 33k 65mV 903 2 ADJUST 13 1V ROB 13V lt 100K 13 1V 1 207 44 _ Svc321x2 n 180P ERS
5. I 57 lle 4 n 9 047 220k i See OSC R154 R14 1 R80 10K R81 mes 2 7K 13 1V ETR 017 R66 6 8K 7 2 6V 5 6K 00 I20mV R12 R15 C1 cte 4 7725 58 Q13 3mV BV 2 7K 104 2 7K 5 D18 R67 5 62 45 R10 05 RAS 1k 6 15 T 220 33K cet Ga 59 865 cne 2 76 3 R153 047 470 16 0 0 uev fis 0 047 2 0047 2 0 33K 914 33 16 33K 14 ES pU 2 25 370 D35 D36 c19 7K 470 AMIE usevi R64 F 25 22 019 vt F 8 m 20 ooi cea Riog 2 5 1 0 012 100K 035 36 e 1C 04 cec ok R169 0 01 say 0 022 100 536 5 9V Q18 Rizo 123 R166 R125 614 Rios By 0 022 T ES 0022 R168 3K 2 7K 25 44 019 24 Qs 33K 150K 0 022 R113 945 944 6 47 5 2 osi 06 R62 pog 270P LO1 470 H R165 58V 100K 1 2K Q43 anv R63 c50 R171 pier 4 1 5K 1000P 100K D14 t We ayes 4 4 B 8 8 109 R163 100K 0 022 044 4 983 100K od 29C536 0734 R162 941 X o2 50536 250734 AM pes Q20 4 2 2 2 50 02 025 8161 R110 R111 R77 10K 10K 56K 1K R130 1750 H 100K 005 ce 8 2K 2 22 23 24 25 26
6. 27 1 35 6 37 38 40 la 142 5 T 330 42v 07 Ravj svi ssv 539 6 z 2 57 1 06 c29 BY 2mv rm 22 T 4700 16 3 12 n 17 fe 5 e 0 X TAL 72MHz R89 47K 45 44 2 i x 037 38 012 5442 2 508 swot swoo Sw10 swit AUTO ST TUNING MUTE NOTES 1 All resist 2 All canac 04 220 R173 2 2K Loe 026 t MPX PLL
7. SERVICE MANUAL pm D SANYO FMT MISL EUROPE LW MW FM STEREO SYNTHESIZER TUNER NOTE The photo on the cover shows the unit with a SILVER front panel The BLUE version is identical in all respects SPECIFICATIONS FM SECTION MW LW SECTION Tuning Frequency Range 87 5 MHz to 108 MHz Tuning Frequency Range MW LW Usable Sensitivity Mono IHF 19 522 kHz to 1 611 kHz 153 kHz to 360 kHz Signal to Noise Ratio at 1 mV Usable Sensitivity 200 500 u V m Mono 75 dB Selectivity at 10 kHz 45 dB 50 dB Stereo 70 dB Image Response Ratio 40 dB 40 dB Capture Ratio 1 0 dB IF Response Ratio 60 dB 65 dB Alt Channel Selectivity DIN 70 dB Signal to Noise Ratio 55 dB 50 dB Image Response Ratio 70dB IF Response Ratio 90 dB GENERAL SECTION AM Suppression Ratio 55 dB Power Source AC 110 220 V 50 Hz Total Hormonic Distortion at 1 mV Power Consumption 12W Mono 0 1 Dimenstions W x H x D 335 x 58 x 275 mm Stereo 0 2 96 Weight 2 1 kg approx Stereo Separation at 1 kHz 45 dB CONNECTING DIAGRAM Right d Left a Turntable TP M15 b Adjustable ferrite speaker speaker bar antenna n 2207 SELECTOR
8. V 25 536 2 2 0V 25 44 0 7V 5 8V 25 1570 0 6V 6 2V 25 3068 0 6V 145mV 2SC536 2mV 0 6V 2SC536 6 4 5 9V AI 02 2SC536 1mV 5 9V 25 536 0 7V 0 2V N Bf dod T 2SC536 0 4V 172mV 25 536 0 6V 117mV s Q04 25 536 18 7V 005 RU 442 AE um 2SA608 18 2V 18 7V 2SA608 18 8 1 7 25 536 2mV 13 0V Et RIO C101 RIS 02797 126 2SA608 13 0V 0 2V 2501012 0 2 3mV 2501012 0 2V 3 923 Q B ERIST B 5 RIIS 040 R159 qug Ae RIZOSAN 039 040 DIGITRON 256536 13 1V FRONT SCHEMATIC DIAGRAM AGC 001 2SK107 FM RO2 ANT COIL LOI t ANT gt 50 gt 001 SVC2 ISP TOP VIEW FM 110 ero 410 510 7 0 810 210 Ros COIL s 003 5 215 Vt 1 5 8 11 OSC COIL lt gt d pas 2SC930E1 E2 002 25 2999 E2 OUT GND 12V
9. ds 1 0 V 1611 kHz Same as above DIGITAL Counter Display Set to 1611 kHz Same as above Adjust CVO2 until DC VTVM reads 10 V MW RF TRACKING ALIGN MENT 603 kHz AM generator to EXT AM Antenna and GND terminals Set to 603 kHz Modu late with 400 Hz 30 modulation DIGITAL Counter Display Set to 603 kHz Connect AC VTVM and Oscilloscope to TUNER output Adjust Bar Antenna MW Coil for maximum gain output 1404 kHz Change generator setting to 1404 kHz DIGITAL Counter Display Set to 1404 kHz Same as above Adjust for maximum gain output AM AUTO STOP ADJUST MENT CAUTION Change generator setting to 999 kHz and output level to 64 dB Set to 999 kHz Adjust VRO7 so that Auto Stop Function works at 999 kHz on DIGITAL Counter This precision high fidelity instrument should be serviced only by qualified personnel trained in the repair of transistor equipment and printed circuitry Perform this alignment after
10. read 100 mV Repeat steps 1 and 2 until optimum alignment is reached FM MUTING LEVEL ADJUST MENT Set generator to 98 MHz Adjust ATT output for 8 uV 18 dB Same as above Scope vertical input to TUNER output Set Function Switch to FM ST MUTE and adjust until the received wave form becomes half of the maximum form Note Decrease the output level of ATT and confirm that the wave form disappears Increase the output level of ATT again and confirm that the input level meets the specifications sufficiently when the wave form has appeared 6 PLL IC FREE RUN FREQ CONT ADJUST MENT 19 kHz Set generator to 98 MHz Adjust ATT output for 60 dB Front Panel DIGITAL Counter Display Set to 98 MHz Connect Frequ ency counter to TPO5 and ground lead to chassis Adjust in multiplex circuit to obtain 19 kHz 50 Hz on Frequency Counter FM STEREO SIGNAL SEPARA TION CONTROL Connect FM stereo SG to FM Antenna terminals 19 kHz sig nal ON Main channel sub channel signal ON Apply 1000 Hz signal from LEFT channel Same as above for RIGHT channel Scope and AC VTVM to RIGHT TUNER output jack Scope and AC VTVM to LEFT TUNER output jack Adjust 4 for minimum output AM ALIGNMENT FUNCTION switch to MW LW position Note Maintain generator outpu
11. s show those obtained with FUNCTION 3 All voltages indicated on the schematics are measured under the SW set to MW following conditions e AC input at 220 volts 50 Hz a Usea V T V M 4 This is a basic schematic diagram b voltages 1096 with respect to chassis ground Ll 874 AB VROI jum 2 1215 Marc 882 163 ms M Zn Rer 042 RI60 um BiG aps 041 IC PIN NUMBERS DC VOLTAGES T 2 3 5 6 7 8 14 15 16 17 18 19 20 24v 21v 24V sev ov 1240 46V 46V 02v 3mv 45V 26v 24v 23v 25 25v 25 05mV ogv ov 12v 16V 13v 13v 5mv ov TRANSISTOR VOLTAGES SYMBOL No DEVICE B 001 250325 14 1V 18 9V 002 250400 6 5 13 1 003 25 536 65mV 13V O04 2SA608 13 1V TIMY 005 25 536 1 13 1V 006 25 608 1 3V 007 25 536 0 6V 104mV 008 2SA608 12 3V 009 25 930 1 5 11 9V R 25 536 123mV 8 3V 25 536 6 2 5 6V 2SA608 1mV 96m
12. t as low as possible for suitable indications FM Tuner Alignment GENERATOR Connect 450 kHz genescope output to Pin No 14 and Pin No 11 DIAL SETTING Position of non interference INDICATOR Connect gene scope input to Connect ground lead to Chassis PROCEDURE Adjust AM IFT T04 for maximum gain and best symmetry LW RF TRACKING ALIGN MENT 153 kHz Do not connect gene rator Front Panel DIGITAL Counter Display Set to 153 kHz Connect DC VTVM to B2 Terminal of FM Front End Adjust LW OSC Coil 08 until DC VTVM reads 1 2V 360 kHz Same as above DIGITAL Counter Display Set to 360 kHz Same as above Adjust 4 until DC VTVM reads 8 0V LW RF TRACKING ALIGN MENT 160 kHz AM generator to EXT AM Antenna and GND terminals Set to 160 kHz Modu late with 400 Hz 30 96 modulation DIGITAL Counter Display Set to 160 kHz Connect AC VTVM and Oscilloscope to TUNER output Adjust Bar Antenna LW Coil for maximum gain output 350 kHz Change generator setting to 350 kHz DIGITAL Counter Display Set to 350 kHz Same as above Adjust CVO1 for maximum gain output MW RF TRACKING ALIGN MENT 522 kHz Do not connect generator Front Panel DIGITAL Counter Display Set to 522 kHz Connect DC VTVM to B2 Terminal of FM Front End Adjust MW OSC Coil TO3 until DC VTVM rea
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