GPX TVR950 Service Manual
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GPX TVR950 Service Manual

GPX TVR950 Service Manual

4-head recorder / hi-fi stereo / remote control
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S/M No. :
Service Manual
VIDEO CASSETTE RECORDER
4-HEAD RECORDER / Hi-Fi STEREO / REMOTE CONTROL
Model : TVR950
July .2002

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Summary of Contents for GPX TVR950

  • Page 1 S/M No. : Service Manual VIDEO CASSETTE RECORDER 4-HEAD RECORDER / Hi-Fi STEREO / REMOTE CONTROL Model : TVR950 July .2002...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS SPECIFICATION ..................WAVEFORMS .................... CIRCUIT DIAGRAM .................. POWER SUPPLY SCHEMATIC DIAGRAM ............SERVO/SYSCON SCHEMATIC DIAGRAM ............VIDEO/AUDIO SCHEMATIC DIAGRAM(4HEAD) ..........VIDEO/AUDIO SCHEMATIC DIAGRAM(Hi-Fi) ............PIF SCHEMATIC DIAGRAM(4HEAD) ..............PIF & MPX SCHEMATIC DIAGRAM(Hi-Fi) ............PCB CIRCUIT BOARD ................INSTRUMENT DISASSEMBLY ..............

  • Page 3: Specification

    SPECIFICATION 120 Volts AC 60Hz Power Input Power Consumption 17 Watts (4-head Hi-Fi) 5 degree C to 40 degree C (41 degree F to 104 degree F) Operating Temperature Storage Temperature -30 degree C to 65 degree C (-22 degree F to 149 degree F) Weight 6.6 Ibs : Net (8.8 Ibs : Gross) Dimensions...

  • Page 4: Waveforms

    WAVEFORMS 1. LUMA / CHROMA WAVEFORMS (IC301-57) 5Vp-p (IC301-57)5Vp-p (IC301-20) 520mVp-p (IC301-20) 520mVp-p 1V/2msec/cm 1V/2msec/cm 200mV/5usec/cm 200mV/5usec/cm PLAY PLAY (IC301-22) 520mVp-p (IC301-22) 520mVp-p (IC301-14) 650mVp-p (IC301-14) 450mVp-p 100mV/5usec 100mV/5usec 200mV/2msec/cm 200mV/2msec/cm PLAY PLAY(SP) VIDEO SW TRIG PLAY(SLP) VIDEO SW TRIG (IC301-36) 300mVp-p (IC301-36)300mVp-p (IC301-25) 4.6Vp-p...
  • Page 5 WAVEFORMS 2. SERVO WAVEFORMS SER VO W A VEFORMS (IC601-18) 5Vp-p (IC601-77) 5Vp-p (IC601-76) 5Vp-p (IC601-94) 3Vp-p 2V/5msec/cm sec/cm sec/cm 1V/5msec/cm REC/PLAY REC/PLAY REC/PLAY (IC601-97) 4.4Vp-p (IC601-90) 25Vp-p&5Vp-p (IC601-87) 2.5Vp-p (IC601-38) 2.6Vp-p 1V/5msec/cm 1V/5msec/cm 1V/0.2msec/cm 0.5V/0.1 sec/cm PLAY REC/PLAY REC/PLAY REC/PLAY...
  • Page 6 WAVEFORMS 3. AUDIO WAVEFORMS AUDIO W (IC301-76) 120mVp-p (IC301-10) 1.5Vp-p (IC301-9) 2.5Vp-p (IC301-2) 120mVp-p 20mV/0.5msec/cm 0.5V/0.5msec/cm 0.5V/0.5msec/cm 50mV/0.5msec/cm PLAY (Q203-C) 7.0Vp-p 10V/20 sec/cm...
  • Page 7 WAVEFORMS 4. Hi-Fi AUDIO WAVEFORMS (IC251-9) 120mVp-p (IC251-19) 250mVp-p (IC251-21) 1.4Vp-p (IC251-29) 600mVp-p 20mV/0.5msec 50mV/0.5msec 0.5V/1msec 0.2V/2msec EE/REC/PLAY EE/REC PLAY (IC251-32) 250mVp-p (IC251-57) 1.4Vp-p 50mV/0.5msec 0.5V/0.5msec EE/REC EE/REC...

  • Page 8: Circuit Diagram

    CIRCUIT DIAGRAM 1. POWER SUPPLY SCHEMATIC DIAGRAM...

  • Page 9: Servo/Syscon Schematic Diagram

    CIRCUIT DIAGRAM 2. SERVO/SYSCON SCHEMATIC DIAGRAM...

  • Page 10: Video/Audio Schematic Diagram(4Head)

    CIRCUIT DIAGRAM 3. VIDEO/AUDIO SCHEMATIC DIAGRAM( 4HEAD )

  • Page 11: Video/Audio Schematic Diagram(Hi-Fi)

    CIRCUIT DIAGRAM 4. VIDEO / AUDIO SCHEMATIC DIAGRAM (HI FI)

  • Page 12: Pif Schematic Diagram(4Head)

    CIRCUIT DIAGRAM 5. PIF SCHEMATIC DIAGRAM( 4HEAD )

  • Page 13: Pif & Mpx Schematic Diagram(Hi-Fi)

    CIRCUIT DIAGRAM 6. PIF & MPX SCHEMATIC DIAGRAM ( HI - FI)

  • Page 14: Pcb Circuit Board

    PCB CIRCUIT BOARD MAIN PCB...

  • Page 15: Instrument Disassembly

    INSTRUMENT DISASSEMBLY Perform all disassembly procedures in the order presented. When reassembling, use the reverse procedure. Make sure that all leads/wiring are routed correctly when reassembling. 1. Top Cover Removal (Fig. 1) 1) Remove two(2) screws Holding the top cover. 2) Carefully lift the back of top cover and slide it to the rear to remove it.
  • Page 16 INSTRUMENT DISASSEMBLY 2. Front Panel Removal (Fig. 2) 1) Continued from (Fig. 1). 2) Release seven(7) tabs holding the front panel. (Release bottom tabs first) 3) Remove the front panel.
  • Page 17 INSTRUMENT DISASSEMBLY 3. Deck Assembly Removal (Fig. 3) 1) Remove the top cover, the front panel 2) Disconnect the FPC 3) Remove five(5) screws (A) (B) (C) (D) (E). 4) Remove one(1) screw (F). 5) Pull out the Deck Assembly in the direction of the arrow.
  • Page 18 INSTRUMENT DISASSEMBLY 4. Main PCB Assembly Removal (Fig. 4) 1) Remove the top cover, the front panel, the bottom cover and the deck assembly. 2) Remove two(2) screws. 3) Release three(3) tabs (A) and lift out the Main PCB in the direction of the arrow.
  • Page 19 INSTRUMENT DISASSEMBLY 5. F/L Door Removal(Fig.5) 1) Open the F/L door 90 degrees. 2) Remove the F/L door in the direction of the arrow.

  • Page 20: Electrical Parts List

    ELECTRICAL PARTS LIST CAUTION : In this Service Manual, some parts can be changed for improving their performance without notice in the parts list. So, if you need the latest parts information, please refer to PPL(Parts Price List)in Service information Center(“http://svc.dwe.co.kr”) “...
  • Page 21 ELECTRICAL PARTS LIST Loc. Parts_code Parts_name Parts_description Buyer Model Remark C252 CEXF1C100A C ELECTRO 16V RSM 10MF 5X7 DV-T8DN, DV-T87N, DV-PT7N C253 CEXF1H479A C ELECTRO 50V RSM 4.7MF 4X7 DV-T8DN, DV-T87N, DV-PT7N C254 CEXF1C100A C ELECTRO 16V RSM 10MF 5X7 DV-T8DN, DV-T87N, DV-PT7N C255 CEXF1H479A...
  • Page 22 ELECTRICAL PARTS LIST Loc. Parts_code Parts_name Parts_description Buyer Model Remark C312 CEXF1C100A C ELECTRO 16V RSM 10MF 5X7 DV-T8DN, DV-T5DN, DV-T3DN, DV-T87N, DV-T47N, DV-T27N, DV-PT7N, DV-PT4N, DV-PT2N C313 CEXF1C100A C ELECTRO 16V RSM 10MF 5X7 DV-T8DN, DV-T5DN, DV-T3DN, DV-T87N, DV-T47N, DV-T27N, DV-PT7N, DV-PT4N, DV-PT2N C314 CEXF1H109A C ELECTRO...
  • Page 23 ELECTRICAL PARTS LIST Loc. Parts_code Parts_name Parts_description Buyer Model Remark C616 CCZB1H471K C CERA 50V B 470PF K (AXIAL) DV-T8DN, DV-T5DN, DV-T3DN, DV-T87N, DV-T47N, DV-T27N, DV-PT7N, DV-PT4N, DV-PT2N C617 CCZF1H104Z C CERA HIKF 50V 0.1MF Z AXIAL DV-T8DN, DV-T5DN, DV-T3DN, DV-T87N, DV-T47N, DV-T27N, DV-PT7N, DV-PT4N, DV-PT2N C628 HCQK180JBA C CHIP CERA...
  • Page 24 ELECTRICAL PARTS LIST Loc. Parts_code Parts_name Parts_description Buyer Model Remark D712 DZN4148--- DIODE 1N4148 AUTO 52MM DV-T8DN, DV-T5DN, DV-T3DN, DV-T87N, DV-T47N, DV-T27N, DV-PT7N, DV-PT4N, DV-PT2N D713 DZN4148--- DIODE 1N4148 AUTO 52MM DV-T8DN, DV-T5DN, DV-T3DN, DV-T87N, DV-T47N, DV-T27N, DV-PT7N, DV-PT4N, DV-PT2N D714 DZN4148--- DIODE...
  • Page 25 ELECTRICAL PARTS LIST Loc. Parts_code Parts_name Parts_description Buyer Model Remark L804 56C220K686 COIL CHOKE 22UH K 27.5X0.4D DV-T8DN, DV-T5DN, DV-T3DN, DV-T87N, DV-T47N, DV-T27N, DV-PT7N, DV-PT4N, DV-PT2N L805 5PB13857-- COIL BEAD BI3857(AXIAL) DV-T8DN, DV-T5DN, DV-T3DN, DV-T87N, DV-T47N, DV-T27N, DV-PT7N, DV-PT4N, DV-PT2N L806 5CPZ680K04 COIL PEAKING...
  • Page 26 ELECTRICAL PARTS LIST Loc. Parts_code Parts_name Parts_description Buyer Model Remark R112 RD-AZ102J- R CARBON FILM 1/6 1K OHM J DV-T8DN, DV-T5DN, DV-T3DN, DV-T87N, DV-T47N, DV-T27N, DV-PT7N, DV-PT4N, DV-PT2N R115 HRFS272JBA R CHIP 1/16 2.7K OHM J 1608 DV-T5DN, DV-T3DN, DV-T47N, DV-T27N, DV-PT4N, DV-PT2N R116 RD-AZ122J- R CARBON FILM...
  • Page 27 ELECTRICAL PARTS LIST Loc. Parts_code Parts_name Parts_description Buyer Model Remark R304 RD-AZ101J- R CARBON FILM 1/6 100 OHM J DV-T8DN, DV-T5DN, DV-T3DN, DV-T87N, DV-T47N, DV-T27N, DV-PT7N, DV-PT4N, DV-PT2N R305 HRFS104JBA R CHIP 1/16 100K OHM J 1608 DV-T8DN, DV-T5DN, DV-T3DN, DV-T87N, DV-T47N, DV-T27N, DV-PT7N, DV-PT4N, DV-PT2N R306 RD-AZ823J- R CARBON FILM...
  • Page 28 ELECTRICAL PARTS LIST Loc. Parts_code Parts_name Parts_description Buyer Model Remark R610 RD-AZ105J- R CARBON FILM 1/6 1M OHM J DV-T8DN, DV-T5DN, DV-T3DN, DV-T87N, DV-T47N, DV-T27N, DV-PT7N, DV-PT4N, DV-PT2N R611 RD-AZ102J- R CARBON FILM 1/6 1K OHM J DV-T8DN, DV-T5DN, DV-T3DN, DV-T87N, DV-T47N, DV-T27N, DV-PT7N, DV-PT4N, DV-PT2N R613 RD-AZ472J- R CARBON FILM...
  • Page 29 ELECTRICAL PARTS LIST Loc. Parts_code Parts_name Parts_description Buyer Model Remark RJ002 HRFS000-BA R CHIP 1/16 0 OHM 1608 DV-T8DN, DV-T5DN, DV-T3DN, DV-T87N, DV-T47N, DV-T27N, DV-PT7N, DV-PT4N, DV-PT2N RS02 HRFS102JBA R CHIP 1/16 1K OHM J 1608 DV-T8DN, DV-T5DN, DV-T3DN, DV-T87N, DV-T47N, DV-T27N, DV-PT7N, DV-PT4N, DV-PT2N RS03 HRFS222JBA R CHIP...
  • Page 30 ELECTRICAL PARTS LIST 2. VCR MODEL PARTSLIST( FOR MEXICO ) Loc. Parts_code Parts_name Parts_description Buyer Model Remark A001 97P0611100 CHASSIS MAIN HIPS(HB) DVST8WN, DVST8MN, DVST5WN, DVST5MN, DVST5TN A0011 97P0800602 PLASTOMER DVST8WN, DVST8MN, DVST5WN, DVST5MN, DVST5TN A017 97P0919100 PLATE EARTH AB SUS 304 CSP T=0.2 DVST8WN, DVST8MN, DVST5WN, DVST5MN, DVST5TN A040...
  • Page 31 ELECTRICAL PARTS LIST Loc. Parts_code Parts_name Parts_description Buyer Model Remark C259 CEXF1C220A C ELECTRO 16V RSM 22MF (5X7) DVST8WN, DVST8MN C260 CCZB1H153K C CERA 50V HIKB 0.015MF K AXL 52 DVST8WN, DVST8MN C261 CBZP1C103M C CERA SEMI 16V Y5S 0.01MF M (AXIAL) DVST8WN, DVST8MN C262 HCBK103KBA...
  • Page 32 ELECTRICAL PARTS LIST Loc. Parts_code Parts_name Parts_description Buyer Model Remark C319 HCBK103KBA C CHIP CERA 50V X7R 0.01MF K 1608 DVST8WN, DVST8MN, DVST5WN, DVST5MN, DVST5TN C322 CEXP1A101A C ELECTRO 10V REM 100MF 6.3X5 5T DVST8WN, DVST8MN, DVST5WN, DVST5MN, DVST5TN C323 CEXF1H109A C ELECTRO 50V RSM 1MF (4X7) TP...
  • Page 33 ELECTRICAL PARTS LIST Loc. Parts_code Parts_name Parts_description Buyer Model Remark C644 HCFH223ZBA C CHIP CERA 25V Y5V 0.022MF Z 1608 DVST8WN, DVST8MN, DVST5WN, DVST5MN, DVST5TN C701 CEXF1C100A C ELECTRO 16V RSM 10MF 5X7 DVST8WN, DVST8MN, DVST5WN, DVST5MN, DVST5TN C703 HCBK103KBA C CHIP CERA 50V X7R 0.01MF K 1608 DVST8WN, DVST8MN, DVST5WN, DVST5MN, DVST5TN...
  • Page 34 ELECTRICAL PARTS LIST Loc. Parts_code Parts_name Parts_description Buyer Model Remark D802 DZN4004--- DIODE 1N4004(AUTO) DVST8WN, DVST8MN, DVST5WN, DVST5MN, DVST5TN D803 DZN4004--- DIODE 1N4004(AUTO) DVST8WN, DVST8MN, DVST5WN, DVST5MN, DVST5TN D804 DZN4004--- DIODE 1N4004(AUTO) DVST8WN, DVST8MN, DVST5WN, DVST5MN, DVST5TN D805 DZEG01C--- DIODE EG01C DVST8WN, DVST8MN, DVST5WN, DVST5MN, DVST5TN D806...
  • Page 35 ELECTRICAL PARTS LIST Loc. Parts_code Parts_name Parts_description Buyer Model Remark M01B 7174301011 SCREW TAPPTITE TT2 RND 3X10 MFZN DVST8WN, DVST8MN, DVST5WN, DVST5MN, DVST5TN M021 7173401211 SCREW TAPPTITE TT2 BIN 4X12 MFZN DVST8WN, DVST8MN, DVST5WN, DVST5MN, DVST5TN P201 97P62Y1318 CONN WAFER DVW250 PLUG 2.5MM 8P DVST8WN, DVST8MN, DVST5WN, DVST5MN, DVST5TN P202...
  • Page 36 ELECTRICAL PARTS LIST Loc. Parts_code Parts_name Parts_description Buyer Model Remark R212 HRFS473JBA R CHIP 1/16 47K OHM J 1608 DVST5WN, DVST5MN, DVST5TN R213 RD-AZ103J- R CARBON FILM 1/6 10K OHM J DVST8WN, DVST8MN R213 RD-AZ752J- R CARBON FILM 1/6 7.5K OHM J DVST5WN, DVST5MN, DVST5TN R220 HRFS223JBA...
  • Page 37 ELECTRICAL PARTS LIST Loc. Parts_code Parts_name Parts_description Buyer Model Remark R320 RD-AZ183J- R CARBON FILM 1/6 18K OHM J DVST8WN, DVST8MN, DVST5WN, DVST5MN, DVST5TN R322 HRFS152JBA R CHIP 1/16 1.5K OHM J 1608 DVST8WN, DVST8MN R322 HRFS162JBA R CHIP 1/16 1.6K OHM J 1608 DVST5WN, DVST5MN, DVST5TN R324 RD-AZ473J-...
  • Page 38 ELECTRICAL PARTS LIST Loc. Parts_code Parts_name Parts_description Buyer Model Remark R649 RD-AZ102J- R CARBON FILM 1/6 1K OHM J DVST8WN, DVST8MN, DVST5WN, DVST5MN, DVST5TN R650 RD-AZ101J- R CARBON FILM 1/6 100 OHM J DVST8WN, DVST8MN, DVST5WN, DVST5MN, DVST5TN R661 RD-AZ203J- R CARBON FILM 1/6 20K OHM J DVST8WN, DVST8MN, DVST5WN, DVST5MN, DVST5TN...

  • Page 39: Model List & Option Table

    ELECTRICAL PARTS LIST 3. MODEL LIST & OPTION TABLE MODEL NAME BUYER BUYER MODEL BRAND COUNTRY GRADE FACTORY DISPLAY F/ AV BATTERY DLC AHC REMOTE DV-T7D5N-QJ TARGET DV-T8DN DAEWOO Hi-Fi GUMI VR-F2TD (A0) DV-T4D5N-QJ TARGET DV-T5DN DAEWOO GUMI VR-F2TD (A0) DV-T2D5N-QJ TARGET DV-T3DN...

  • Page 40: Appendix

    TROUBLESHOOTING GUIDES Appendix 1. POWER CIRCUIT Caution : When checking the primary circuit, be sure to use an isolation transformer. NO OUTPUT Voltage Is the AC power cord Change AC CORD. check OK? Is 140V Supplied to + Check F801/L801/D801/D802 of C806? D803/D804/C806.

  • Page 41: Servo/Syscon/Logic Circuit

    TROUBLESHOOTING GUIDES Appendix 2. SERVO / SYSCON / LOGIC CIRCUIT LED does not operate Is+5V supplied to Check D809. pin 37 of IC601? Is pulse applied Check IC601. to pin 1~5 of LD701? Is pulse applied Check IC601. to 6~13 of LD701? Check LD701...
  • Page 42 TROUBLESHOOTING GUIDES Appendix LED Array is lit but keys do not operate. Is each key pulse Check key matrix applied to pin11,12 circuit. of IC601? Check IC601 1 minute back up timer does not operate. When disconnecting the power cord,Is 5.0V Check D601.
  • Page 43 TROUBLESHOOTING GUIDES Appendix When change the channel broadcast signal is not received. Is the output of pin 71, 72 of IC601 Check IC601 Check the Video normal? output Buffer Q101. Check the Video, Check the video output Check the video signal Audio output signal of signal pin 26 of IC301.
  • Page 44 TROUBLESHOOTING GUIDES Appendix Playback picture is not good. Are SW pulse and Is SW pulse supplied Check D.PG input from pin 18 of IC601? (IC601 pin 90) HA SW applied to VIDEO circuit? and connector (P502) Check PCB pattern Is Enve.waveform supplied to at pin 4 of PT01? Check connector.
  • Page 45 TROUBLESHOOTING GUIDES Appendix Drum Motor dose not rotate. Is 12V supplied to P502 Check power circuit. pin 4? Is D.PWM (pin 76) Check IC601 and D.FG. of IC601 correct? Is the voltage of P502 pin 1 Check R508, R509 and C514. 1.2V? Check connector (P502) and DRUM Motor.
  • Page 46 TROUBLESHOOTING GUIDES Appendix LED Array(or VFD) shows "Err" Is CAM SW DATA Check CAM SW. (SW501 pin 1,2,3,4) correct? Is CAM DATA Check R626~R629, (IC601 pin 61,62,65,66) correct? C660~C663. Check IC601...
  • Page 47 TROUBLESHOOTING GUIDES Appendix Cassette loading inoperative. Is 12V applied to Pin 7 Check power circuit. of IC604? Is 5V applied to pin 81 of Check IC601. IC601 when CST IN? Is 5V applied to pin 3 of Check motor drive circuit P201 when CST IN? Check connector (P201 pin 1 and 3) and loading...

  • Page 48: Video Circuit

    TROUBLESHOOTING GUIDES Appendix 3. VIDEO CIRCUIT EE MODE Picture NG Is video signal input into pin Check PIF circuit and 28,30,32 of IC301? LINE IN JACK. Is 5V supplied at pin 23,24,45, Check power circuit. 52 of IC301? IS C.S .. DATA CLOCK signal Check IC 601pin 70,71,72 input pin 53,54,55 of IC 301? Is signal output from pin 26...
  • Page 49 TROUBLESHOOTING GUIDES Appendix PB video signal missing. Is C.S.. DATA CLOCK signal Check C801 pin input pin 53,54,55 of IC301? 70,72,74? Is envelope output from Is 5V supplied at Check power IC301 pin 14 ? IC301 pin 68 ? circuit. Is SW pulse input into Check IC601 pin 18...
  • Page 50 TROUBLESHOOTING GUIDES Appendix Record video signal poor. Check EE mode. Is Iuminance and color Is signal input into signal output from IC301 pin 28,30,32? IC301 pin 46,58 ? Is +5V supplied at Check power circuit IC301 pin 68 ? Is REC signal output from IC301 pin 66,73? Change IC301.
  • Page 51 TROUBLESHOOTING GUIDES Appendix OSD Character Incorrect. Is 5V supplied at IC601 pin 53,98,99? Check power circuit. Does oscillate at IC 601 Pin 44,45? Check RS01,LS01,CS01,CS02. Change IC601.

  • Page 52: Audio Circuit (Hi-Fi Model)

    TROUBLESHOOTING GUIDES Appendix 4. AUDIO CIRCUIT (Hi-Fi MODEL) No sound in the E-E mode Is -12V supplied to pin 58 of IC251? Check power circuit. Is 5V supplied to pin 25,40 of IC251 and pin 77 of IC301? Is signal input pin 9,14 Check INPUT JACK of IC251 in line 1 mode? Is 0V supplied to pin 36...
  • Page 53 TROUBLESHOOTING GUIDES Appendix No Hi-Fi sound in playback mode of Hi-Fi recorded tape. Is the ENVE level of IC251 pin 29,30 Check the PRE-AMP circuit more than 200mVp-p? Is A.SW PULSE input into Check IC601 pin 27 of IC251? Is the voltage of IC251 pin 28 Change IC251 above 5V ? Check IC601...
  • Page 54 TROUBLESHOOTING GUIDES Appendix No Hi-Fi sound in the playback mode after Hi-Fi recording. Check the following procedure in RECORD mode Is the signal supplied to Check RF101. pin 48 of IC251? Is 5V Base of Q205? Check IC601. Is there output at Check IC251.
  • Page 55 TROUBLESHOOTING GUIDES Appendix No sound in the linear playback mode Is the output at pin Is 12V supplied pin Check Power circuit 53,57 of IC251? 58 of IC251? Is 5V supplied to pin 25,40 Check Power circuit of IC251 and pin 77 of IC301? Is there Audio signal Check A/C head...
  • Page 56 TROUBLESHOOTING GUIDES Appendix No linear sound in the playback mode after linear recording. Check the following procedure in RECORD mode. Is the signal supplied to pin 9,14 Check INPUT JACK. of IC251 and pin 76 of IC301? Check IC601. Is 5V Base of Q205? Is there output at pin Check IC301.

  • Page 57: Audio Circuit (4Head Model)

    TROUBLESHOOTING GUIDES Appendix 5. AUDIO CIRCUIT ( 4 HEAD MODEL) No sound in the E-E mode Is 5V supplied to pin 77 Check power circuit. of IC301? Is signal input pin 76 Check INPUT JACK of IC301 in line mode? Is 0V supplied to pin 58 Check SYSCON circuit of IC301?
  • Page 58 TROUBLESHOOTING GUIDES Appendix No sound in the playback mode Is the output at pin 23 Is 5V applied to pin 73 Check power circuit. of IC301? of IC301? Is 0V supplied to pin 58 Check R252, R270, C297. Check IC601. of IC301? Check Q203, Q204, Q205.
  • Page 59 TROUBLESHOOTING GUIDES Appendix No sound in the playback mode after recording. Check the following procedure in RECORD mode Is the signal applied to Check INPUT JACK. pin 76 of IC301? Is pin 58 of IC301 0V? Check IC601. Is there output at Check IC301.

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