13
TROUBLESHOOTING
B. Playback picture doesn’t appear
YES
YES
Is Y signal output at IC301
pin#46?
Is Y signal input at IC301
pin#43?
Is Video signal output at IC302
pin#3?
Check and Replace IC301.
Check PCB Pattern.
Playback picture doesn’t
appear.
Is Envelope output at IC301
pin#79?
NO
NO
YES
Is Video signal input at IC601
pin#50?
Is 5V obtained at IC301
pin#91?
Is SW Pulse input at IC301
pin#70?
Is 5V obtained at IC301
pin#24,42,55,64?
Check POWER 5V.
Check IC601 pin#18.
Check and Replace HEAD.
Check POWER 5V.
YES
NO
NO
Does X301(4.43MHz) oscillate?
Check Pattern.
NO
NO
NO
YES
NO
NO
YES
YES
YES
YES
Replace X301.
Is Video signal output at IC301
pin#65?
Check IC301 pin# 62.68,69,70.
NO
YES
Check PCB pattern
NO
IC302 pin#9,10,11(control
DC), 16(Vcc)
NO
Check
Pattern.
Check IC604 PIN#3(C sync)
YES
Summary of Contents for DV6T712D
Page 27: ...26 WAVEFORMS 15 9 P201 2 2 AUDIO 2 1 AUDIO Mono...
Page 29: ...28 CIRCUIT DIAGRAM 1 POWER SUPPLY SCHEMATIC DIAGRAM PAL COMBO...
Page 30: ...29 CIRCUIT DIAGRAM 2 AV CIRCUIT DIAGRAM...
Page 31: ...30 3 SERVO SYSCON SCHEMATIC DIAGRAM CIRCUIT DIAGRAM...
Page 32: ...31 4 DIGITAL AUDIO SCHEMATIC DIAGRAM CIRCUIT DIAGRAM...
Page 33: ...32 5 HI FI SW CIRCUIT DIAGRAM CIRCUIT DIAGRAM...
Page 34: ...33 CIRCUIT DIAGRAM 6 IF MPX PDC INPUT OUTPUT SCHEMATIC DIAGRAM...
Page 35: ...34 PCB CIRCUIT BOARD 1 1 VCR MAIN...
Page 36: ...35 PCB CIRCUIT BOARD 1 2 POWER...
Page 37: ...36 PCB CIRCUIT BOARD 1 3 LOGIC...
Page 39: ...38 INSTRUMENT DISASSEMBLY FIG 3 C PANEL FRONT DISASSEMBLY...
Page 40: ...39 INSTRUMENT DISASSEMBLY FIG 4 D LOGIC PCB DISASSEMBLY...
Page 41: ...40 INSTRUMENT DISASSEMBLY FIG 5 E DECK AND MAIN PARTS DISASSEMBLY...
Page 42: ...41 INSTRUMENT DISASSEMBLY FIG 6 F MAIN PCB DISASSEMBLY...
Page 43: ...42 INSTRUMENT DISASSEMBLY FIG 7 G MAIN CHASSIS DISASSEMBLY...
