12
TROUBLESHOOTING
B. Playback picture doesnÕt appear
YES
YES
Is Y SIGNAL output at IC301
pin#46?
Is VIDEO SIGNAL output at IC301
pin#65?
Check and Replace IC301.
PB video signal missing.
Is Envelope output from IC301
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.
MC-Service
Summary of Contents for SD-7500
Page 1: ...SERVICE MANUAL DAEWOO SD 7500 MODEL MC Service ...
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 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 58: ...686 AHYEON DONG MAPO GU SEOUL KOREA C P O BOX 8003 SEOUL KOREA DAEWOO ELECTRONICS Corp ...