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Daewoo SD-7500 Service Manual Download Page 11

9

TROUBLESHOOTING

Cassette tape isnÕt inserted.

Is 5V voltage obtained at Loading

parts IC501 pin#2?

Is 14V voltage obtained at

Capstan Motor P501 pin#2?

Check at EVER 14V

Check Q850.

Connect Capstan and Loading Motor.

Check connector and Capstan Motor.

YES

NO

NO

NO

Is 13V voltage obtained at Each

parts of Loading Motor?

Replace Loading Motor.

Check D851 and POWER circuit.

D. No CASSETTE Loading

YES

YES

E. AUTO STOP in Playback mode

VCR stops automatically in

playback mode.

Check R544,C516 and P510

pin#11.

Check S603, S604 REEL Sensor.

Is D.PG/FG pulse at IC501

pin#90 normal ?

Is C. FG pulse at IC501 pin#87

normal ?

Is there REEL Pulse at IC501

pin#79, 80?

Check and replace IC501.

NO

YES

YES

YES

NO

Check C.FG(R543,C517) and

P510 pin#1.

NO

MC-Service

Summary of Contents for SD-7500

Page 1: ...SERVICE MANUAL DAEWOO SD 7500 MODEL MC Service ...

Page 2: ...S DC A23D1D DC A23D1S Caution In this 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 DAEWOO ELECTRONICS Corp July 2003 http svc dwe co kr ...

Page 3: ...1 SPECIFICATIONS 2 ADVANTAGES OF THIS PRODUCT 3 TROUBLE SHOOTING 5 WAVEFORMS 23 CIRCUIT DIAGRAM 26 PCB CIRCUIT BOARD 36 INSTRUMENT DISASSEMBLY 39 ELECTRICAL PARTSLIST 45 CONTENTS MC Service ...

Page 4: ...VIDEO output common use of DVD and VCR VIDEO output terminal 1 0 Vp p unbalanced RCA JACK SCART JACK VIDEO output DVD only RGB output 75Ω In load R 0 7Vp p G 0 7Vp p B 0 7Vp p AUDIO output common use of DVD and VCR Audio output terminal 2 kinds 5 8dBm VCR 2Vrms DVD RCA JACK AUDIO output DVD only Analogue AUDIO output 2 0Vrms Digital audio output OPTICAL COAXIAL Playable tape Very high dense tapes ...

Page 5: ...ded with Dolby Digital dts decoder Built in Dolby Digital decoder DVD Analog audio 2 channels output for DOWNMIX x1 Composite video output x1 Slow Forward Reverse playback DVD Fast Forward Reverse playback Search of title chapter and time in DVD disc and search of time and track time in VCD and CD Various TV aspect DVD 4 3 for Pan and Scan 4 3 for Letter Box and 16 9 for Wide Repeat playback title...

Page 6: ... case of SVCD or VCD it depends on the disc The number of subtitle languages depends on the software Multi Angle function DVD This function allows you to choose the viewing angle of scenes which were shot from a number of different angles The number of angles depends on the software Screen zoom function DVD VCD ...

Page 7: ... cord is ok Is 400V 200V voltage obtained at C804 Output voltage of 2nd parts is normal Check rectifier diode of 2nd parts D821 D822 D823 D826 D827 D828 D830 Switching pulse of Q801 collector is normal OK Exchange POWER CORD Check F801 Exchange rectifier diode of 2nd parts D821 D822 D823 D826 D827 D828 D830 Check Q801 NO YES YES YES YES YES NO NO NO NO ...

Page 8: ...illation at IC701pin 1 Specific GRID SEG doesnÕt function Check R588 D857 L503 L860 Exchange IC701 Check IC 701 pin 22 24 27 28 30 31 Check IC 701 pin 10 12 14 21 NO YES YES NO NO GRID output at PORT of IC701 YES SEG output at PORT of IC701 Exchange IC701 YES A LED DISPLAY NO MC Service ...

Page 9: ...s on the screen even though changing tape Re adjust the height of AC HEAD Remove the dust Check C510 R545 R547 IC 501 pin 91 92 98 NO Re adjust PATH B 1 Bad playback quality 1 YES YES YES YES Noise appears on the Full playback screen Are SW pulse and HA SW normal Recheck step B 1 Bad playback quallty 1 Check HEAD AMP connector and HEAD YES YES NO NO ENVE Wave at P502 pin 4 Check VIDEO circuit Are ...

Page 10: ...ATA normal Is SIF Video output at TMI RF101 pin 22 24 normal Check IC 501 Check IC301 Check IC501 YES YES NO NO NO Is Video Signal input at IC501 pin 50 Is there Video output at IC501 pin 52 Check TMI RF101 Block NO Check Video Buffer Q670 Q671 C No broadcasting signal received YES YES YES ...

Page 11: ...ltage obtained at Each parts of Loading Motor Replace Loading Motor Check D851 and POWER circuit D No CASSETTE Loading YES YES E AUTO STOP in Playback mode VCR stops automatically in playback mode Check R544 C516 and P510 pin 11 Check S603 S604 REEL Sensor Is D PG FG pulse at IC501 pin 90 normal Is C FG pulse at IC501 pin 87 normal Is there REEL Pulse at IC501 pin 79 80 Check and replace IC501 NO ...

Page 12: ...oltage obtained at P501 pin 9 Check P501 Connector and Capstan Motor Check EVER 14V Q850 Check Capstan FG IC 501 pin 87 Check R541 R540 R539 R538 C518 Check R537 R536 C521 DRUM Motor stops Is 14V voltage obtained at P501 pin 8 YES NO NO NO YES YES Is DRUM PWM fit to IC 501 pin 76 Is 2 6V voltage obtained at P501 pin 12 Check Capstan Motor and DRUM Motor Check EVER 14V Q850 Check DRUM PG FG IC 501 ...

Page 13: ...Check IC501 pin 58 71 72 NO YES YES NO NO YES Is signal output from pin 65 of IC301 YES NO Check IC301 pin 62 Q V Sync Is signal input into pin 50 of IC501 YES NO Check PCB Pattern Is signal output from pin 52 of IC501 YES NO Is 5V supplied to pin 53 98 99 of IC501 Is signal output at IC301 pin 61 YES NO Check PCB Pattern Q309 Q310 Check IC 501 YES Check POWER circuit NO Is signal input at IC301 p...

Page 14: ...C301 pin 79 NO NO Same as EE MODE check Is 5V supplied at IC301 pin 91 Is SW Pulse input at IC301 pin 70 Is 5V obtained at IC301 pin 24 42 55 72 91 Check POWER 5V Check IC601 pin 18 Clean head or Replace head Check POWER 5V NO NO Check PATTERN NO YES YES YES YES YES YES NO Does X301 4 43MHz oscillate Is Y SIGNAL input at IC301 pin 43 NO Check PATTERN YES NO Replace X301 NO Check and replace IC301 ...

Page 15: ... 89 90 LP MODE 89 90 Pin SP MODE 94 95Pin Check video HEAD and Connector Is signal input into IC301 pin 48 50 52 54 56 Check POWER circuit Check IC501 pin 18 Record video signal poor Check EE MODE YES Is luminance and color signal output from IC301 pin 78 Replace IC301 NO NO YES C No recording YES Is IC301 pin 80 REC H HIGH Check IC501 pin 45 NO ...

Page 16: ...pin 52 NO Replace IC501 D No OSD On Screen Display appears YES YES NO Check IC 501 Check IC 501 NO Check PCB Pattern Check FFC CABLE DVD Module DVD Composite signal doesnÕt appear Is signal output at PD01 pin 7 Is signal at IC301 pin 56 NO E No DVD Video YES YES Remark previous 3 A Is signal at IC301 pin 61 Check IC301 NO Check RF output YES YES Check Line output ...

Page 17: ... NO Is 5V obtained at IC251 pin 40 Replace IC251 YES YES Is 12V obtained at IC251 pin 34 NO YES Check POWER circuit YES Replace IC601 Is 5V obtained at IC051 pin 1 Check Power circuit NO Is there SIF signal at IC051 pin 2 in RF mode Check RF101 NO YES Is there SIF signal out at IC051 pin 30 31 Check IC051 NO YES YES Comparing with switching table are SWA B CTL SIGNAL right at IC601 pin 9 10 NO Che...

Page 18: ...3 13 Check IC501 Is Audio signal output at IC251 pin 16 17 Are CLK and DATA obtained at IC251 pin 42 43 NO Is 5V obtained at IC251 pin 40 Replace IC251 YES YES Is 12V obtained at IC251 pin 34 NO YES Check POWER circuit YES Replace IC601 YES Comparing with switching table are SWA B CTL SIGNAL right at IC601 pin 9 10 NO Check Output JACK YES YES NO ...

Page 19: ...3 13 Check IC501 Is Audio signal output at IC251 pin 19 20 Are CLK and DATA obtained at IC251 pin 42 43 NO Is 5V obtained at IC251 pin 40 Replace IC251 YES YES Is 12V obtained at IC251 pin 34 NO YES Check POWER circuit YES Replace IC601 YES Comparing with switching table are SWA B CTL SIGNAL right at IC601 pin 9 10 NO Check Output JACK YES YES NO ...

Page 20: ...nal at IC601 pin 2 15 YES YES Check ICD03 NO Check DVD board NO Check POWER circuit NO Is DVD Audio signaloutput at ICD03 pin 1 7 Check ICD03 NO YES Is Audio signal output at IC601 pin 3 13 Check IC501 YES Replace IC601 Comparing with switching table are SWA B CTL SIGNAL right at IC601 pin 9 10 NO Check Output JACK YES YES NO MC Service ...

Page 21: ... 1 12 Check Input Front JACK NO Is Audio signal output at IC601 pin 3 13 Check IC501 YES Replace IC601 Comparing with switching table are SWA B CTL SIGNAL right at IC601 pin 9 10 NO Check Output JACK YES YES NO e FRONT E E No sound in Front E E mode ...

Page 22: ...3 Check IC501 Is Audio signal output at IC251 pin 16 17 Are CLK and DATA obtained at IC251 pin 42 43 NO Is 5V obtained at IC251 pin 40 Replace IC251 YES YES Is 12V obtained at IC251 pin 34 NO YES Check POWER circuit YES Replace IC601 Comparing with switching table are SWA B CTL SIGNAL right at IC601 pin 9 10 NO Check Output JACK YES YES NO ...

Page 23: ...gnal at P401 pin 2 Replace IC251 YES HEAD CLEANING YES D No NORMAL AUDIO playback PLAY MODE Is Playback Audio signal at IC301 pin 11 Replace IC251 YES NO NO Is there Playback Normal Audio signal at IC251 pin 17 18 Check A C HEAD and IC301 YES Check Output JACK YES Is there normal Audio signal at IC251 pin 17 18 NO Check power circuit NO Voltage at IC251 pin 34 is 12V Voltage at IC251 pin 40 and at...

Page 24: ...s there recording signal at IC251 pin 21 Check Input LINE1 JACK Check Input LINE2 JACK Check ICD03 DVD Check signal flow circuit YES NO NO NO Signal at IC251 pin 21 is transferred to IC301 pin 13 15 17 Collect signal at C222 is about 70Vp p at 70KHz Check IC251 YES YES Check Q203 NO Check P201 pin 2 4 8 and A C HEAD YES REC H BASE voltage at Q206 is 5V Check IC501 pin 45 NO YES ...

Page 25: ...01 43 520mVp p 100mV 5usec REC IC301 43 520mVp p 100mV 5usec PLAY IC301 21 600mVp p 200mV 2msec cm PLAY SP VIDEOSWTRIG IC301 21 350mVp p 200mV 2msec cm PLAY EP VIDEOSWTRIG IC301 67 4 6Vp p 2V 10usec cm REC PLAY IC301 67 4 6Vp p 2V 10usec cm PICTURE SEARCH IC301 65 2 2Vp p 500mV 5usec cm REC IC301 65 2 2Vp p 500mV 5usec cm PLAY IC301 28 450mVp p 200mV 0 1usec cm ...

Page 26: ...m REC IC301 100 2 3Vp p 0 5V 0 5msec cm REC 1 IC301 8 120mVp p 50mV 0 5msec cm PLAY 2 P202 2 75Vp p 10V 20µsec cm REC 3 IC251 2 80mVp p 20mV 0 5msec EE REC PLAY 4 IC251 24 200mVp p 50mV 0 5msec EE REC 5 IC251 34 1 4Vp p 0 5V 1msec REC 6 IC251 32 200mVp p 50mV 0 5msec EE REC 7 IC251 16 1 4Vp p 0 5V 0 5msec EE REC MC Service ...

Page 27: ...9 IC601 77 5Vp p 2V 5µsec cm REC PLAY 0 IC601 76 5Vp p 2V 5µsec cm REC PLAY IC601 94 3Vp p 1V 5msec cm REC IC601 97 4 4Vp p 1V 5msec cm PLAY IC601 90 25Vp p 5Vp p 1V 5msec cm REC PLAY IC601 87 2 5Vp p 1V 0 2msec cm REC PLAY Q IC601 38 2 6Vp p 0 5V 0 1µsec cm REC PLAY ...

Page 28: ...26 CIRCUIT DIAGRAM 1 POWER SUPPLY CIRCUIT DIAGRAM MC Service ...

Page 29: ...27 CIRCUIT DIAGRAM 2 SERVO SYSCON CIRCUIT DIAGRAM VCR AM REC COPY C dts T DVD MC Service ...

Page 30: ...28 CIRCUIT DIAGRAM 3 VIDEO AUDIO CIRCUIT DIAGRAM MC Service ...

Page 31: ...29 4 HiFi SW INPUT CIRCUIT DIAGRAM CIRCUIT DIAGRAM MC Service ...

Page 32: ...30 CIRCUIT DIAGRAM 5 PIF CIRCUIT DIAGRAM MC Service ...

Page 33: ...31 CIRCUIT DIAGRAM 6 DVD CIRCUIT DIAGRAM MC Service ...

Page 34: ...32 CIRCUIT DIAGRAM MC Service ...

Page 35: ...33 CIRCUIT DIAGRAM MC Service ...

Page 36: ...34 CIRCUIT DIAGRAM MC Service ...

Page 37: ...35 CIRCUIT DIAGRAM MC Service ...

Page 38: ...36 PCB CIRCUIT BOARD 1 1 VCR MAIN MC Service ...

Page 39: ...37 PCB CIRCUIT BOARD 1 2 POWER MC Service ...

Page 40: ...38 PCB CIRCUIT BOARD 1 3 DVD MAIN MC Service ...

Page 41: ... all disassembly procedures in the order presented When reassembling use the reverse procedure Make sure that all leads wiring are routed correctly when reassembling FIG 1 A TOP COVER REMOVAL Remove two screws Remove three screws Remove two screws 39 ...

Page 42: ...FRONT DISASSEMBLY C LOGIC PCB DISASSEMBLY FIG 2 FIG 3 Remove 3 Hooks at bottom Remove 2 Hooks at left and right sides Simultaneously remove panel Remove 2 screws then remove Logic INSTRUMENT DISASSEMBLY MC Service ...

Page 43: ...41 INSTRUMENT DISASSEMBLY FIG 4 D DECK AND MAIN PARTS DISASSEMBLY Remove 6 screws then remove DECK Remove 4 screws then remove LOADER Remove 3 screws then remove POWER PCB ...

Page 44: ...42 INSTRUMENT DISASSEMBLY FIG 5 E MAIN PCB DISASSEMBLY Remove 2 screws then remove MAIN PCB Remove 2 screws MC Service ...

Page 45: ...43 INSTRUMENT DISASSEMBLY F MAIN CHASSIS DISASSEMBLY FIG 6 Remove 4 screws then remove MAIN ...

Page 46: ...44 INSTRUMENT DISASSEMBLY G Explode view MC Service ...

Page 47: ... CCHIPCERA 25VY5V0 1MFZ1608 C058 HCFH104ZBA CCHIPCERA 25VY5V0 1MFZ1608 C060 HCFH104ZBA CCHIPCERA 25VY5V0 1MFZ1608 C062 HCFH104ZBA CCHIPCERA 25VY5V0 1MFZ1608 C067 HCFH104ZBA CCHIPCERA 25VY5V0 1MFZ1608 C153 HCBK103KBA CCHIPCERA 50VX7R0 01MFK1608 C157 HCBK563KBA CCHIPCERA 50VX7R0 056MFK1608 C159 HCBK103KBA CCHIPCERA 50VX7R0 01MFK1608 C161 HCQK220JBA CCHIPCERA 50VCH22PFJ1608 C202 HCBK152KBA CCHIPCERA ...

Page 48: ...HCBK102KBA CCHIPCERA 50VX7R1000PFK1608 C698 HCQK330JBA CCHIPCERA 50VCH33PFJ1608 C699 HCQK330JBA CCHIPCERA 50VCH33PFJ1608 C888 HCFH223ZBA CCHIPCERA 25VY5V0 022MFZ1608 CD06 HCBK471KBA CCHIPCERA 50VX7R470PFK1608 CD09 HCQK221JBA CCHIPCERA 50VCH220PFJ1608 LOC PARTS_CODE PARTS_NAME PARTS_DESCR REMARK CD10 HCBK471KBA CCHIPCERA 50VX7R470PFK1608 CD21 HCQK221JBA CCHIPCERA 50VCH220PFJ1608 CD53 HCFH104ZBA CCH...

Page 49: ...11 HRFS103JBA RCHIP 1 16 10KOHMJ1608 R515 HRFS222JBA RCHIP 1 16 2 2KOHMJ1608 R516 HRFS103JBA RCHIP 1 16 10KOHMJ1608 LOC PARTS_CODE PARTS_NAME PARTS_DESCR REMARK R517 HRFS102JBA RCHIP 1 16 1KOHMJ1608 R518 HRFS182JBA RCHIP 1 16 1 8KOHMJ1608 R520 HRFS561JBA RCHIP 1 16 560OHMJ1608 R521 HRFS561JBA RCHIP 1 16 560OHMJ1608 R523 HRFS472JBA RCHIP 1 16 4 7KOHMJ1608 R524 HCFH104ZBA CCHIPCERA 25VY5V0 1MFZ1608 ...

Page 50: ... 5X7 TP LOC PARTS_CODE PARTS_NAME PARTS_DESCR REMARK C208 CEXF1H479A CELECTRO 50VRSM4 7MF4X7 C210 CEXF1C220A CELECTRO 16VRSM22MF 5X7 C213 CEXF1H478A CELECTRO 50VRSM0 47MF4X7 C214 CEXF1C330A CELECTRO 16VRSM33MF 6 3X7 TP C219 CEXF1C470A CELECTRO 16VRSM47MF 5X7 TP C222 CMXM2A153J CMYLAR 100V0 015MFJ TP C223 CEXF1H479A CELECTRO 50VRSM4 7MF4X7 C225 CMXM2A333J CMYLAR 100V0 033MFJ TP C261 CEXF1C100A CELE...

Page 51: ... COILPEAKING 100UH BRN BRN LD51 5CPX100J2T COILPEAKING 10UH BRN BLK Q201 TZTC3198Y TRANSISTOR KTC3198Y 1815Y AUTO Q203 TZTC3202Y TR KTC3202Y AUTO 1959Y LOC PARTS_CODE PARTS_NAME PARTS_DESCR REMARK Q204 TZTC3198Y TRANSISTOR KTC3198Y 1815Y AUTO Q205 TZTC3198Y TRANSISTOR KTC3198Y 1815Y AUTO Q206 TZTA1266Y TR KTA1266Y AUTO 1015Y Q207 TZTA1266Y TR KTA1266Y AUTO 1015Y Q208 TZTC3198Y TRANSISTOR KTC3198Y ...

Page 52: ...3 5MM L342 5CPZ229K02 COILPEAKING 2 2UHK AXIAL 3 5MM L526 5CPZ100K02 COILPEAKING 10UHK AXIAL3 5MM LOC PARTS_CODE PARTS_NAME PARTS_DESCR REMARK L602 5CPZ229K02 COILPEAKING 2 2UHK AXIAL 3 5MM L604 5CPZ229K02 COILPEAKING 2 2UHK AXIAL 3 5MM L605 5CPZ229K02 COILPEAKING 2 2UHK AXIAL 3 5MM L606 5CPZ229K02 COILPEAKING 2 2UHK AXIAL 3 5MM L612 5CPZ229K02 COILPEAKING 2 2UHK AXIAL 3 5MM L613 5CPZ229K02 COILPE...

Page 53: ...C PARTS_CODE PARTS_NAME PARTS_DESCR REMARK RD21 RD AZ302J RCARBONFILM 1 63KOHMJ RD22 RD AZ221J RCARBONFILM 1 6220OHMJ RD26 RD AZ303J RCARBONFILM 1 630KOHMJ RD27 RD AZ104J RCARBONFILM 1 6100KOHMJ RD28 RD AZ303J RCARBONFILM 1 630KOHMJ RD29 RD AZ104J RCARBONFILM 1 6100KOHMJ RD31 RD AZ103J RCARBONFILM 1 610KOHMJ RD32 RD AZ103J RCARBONFILM 1 610KOHMJ RD50 RD AZ221J RCARBONFILM 1 6220OHMJ RD51 RD AZ221J...

Page 54: ...5V0 1MFZ1608 CC42 HCFH104ZBA CCHIPCERA 25VY5V0 1MFZ1608 CC43 HCFH104ZBA CCHIPCERA 25VY5V0 1MFZ1608 LOC PARTS_CODE PARTS_NAME PARTS_DESCR REMARK CC44 HCFH104ZBA CCHIPCERA 25VY5V0 1MFZ1608 CC45 HCFH104ZBA CCHIPCERA 25VY5V0 1MFZ1608 CC46 HCFH104ZBA CCHIPCERA 25VY5V0 1MFZ1608 CC47 HCFH104ZBA CCHIPCERA 25VY5V0 1MFZ1608 CC48 HCFH104ZBA CCHIPCERA 25VY5V0 1MFZ1608 CC50 HCQK180JBA CCHIPCERA 50VCH18PFJ1608 ...

Page 55: ...1 16 1KOHMJ1608 RA18 HRFS220JBA RCHIP 1 16W22OHMJ1608 RA20 HRFS512JBA RCHIP 1 16 5 1KOHMJ1608 RA22 HRFS000 BA RCHIP 1 16 0OHM1608 RA23 HRFS000 BA RCHIP 1 16 0OHM1608 LOC PARTS_CODE PARTS_NAME PARTS_DESCR REMARK RA24 HRFS123JBA RCHIP 1 16 12KOHMJ1608 RA26 HRFS103JBA RCHIP 1 16 10KOHMJ1608 RA27 HRFS474JBA RCHIP 1 16 470KOHMJ1608 RA28 HRFS563JBA RCHIP 1 16 56KOHMJ1608 RA30 HRFS103JBA RCHIP 1 16 10KOH...

Page 56: ...CHIP 1 16 6 8OHMJ1608 LOC PARTS_CODE PARTS_NAME PARTS_DESCR REMARK RP03 HRFS689JBA RCHIP 1 16 6 8OHMJ1608 RP04 HRFS689JBA RCHIP 1 16 6 8OHMJ1608 UL01 97Q65288DA PCBDVD 245X246X1 6T 4 CEM 3 Z0012 PVMGJRDA00 PCBMPEGRADIALAS DQL 1003BAGIC 2CH CA41 CEXF1A101A CELECTRO 10VRSM100MF6 3X7 CA42 CEXF1A101A CELECTRO 10VRSM100MF6 3X7 CA44 CEXF1C101A CELECTRO 16VRSM100MF 6 3X7 TP CB13 CEXF1A101A CELECTRO 10VRS...

Page 57: ...805 5PB13857Ñ COILBEAD BI3857 AXIAL R803 RD 4Z394JS RCARBONFILM 1 4390KOHMJSMALL R804 RD 4Z394JS RCARBONFILM 1 4390KOHMJSMALL R805 RD AZ103J RCARBONFILM 1 610KOHMJ R807 RD 2Z820JS RCARBONFILM 1 282OHMJSMALL R808 RD 2Z560JS RCARBONFILM 1 256OHMJSMALL R809 RD AZ681J RCARBONFILM 1 6680OHMJ R810 RC 2Z565KP RCARBONCOMP 1 25 6MOHMK R821 RD AZ470J RCARBONFILM 1 647OHMJ R822 RN AZ182F RMETALFILM 1 61 8KOH...

Page 58: ...686 AHYEON DONG MAPO GU SEOUL KOREA C P O BOX 8003 SEOUL KOREA DAEWOO ELECTRONICS Corp ...

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