18
TROUBLESHOOTING
Is there Audio at IC252
pin#1,12?
IC601 pin#27
A.Mute is L or
H?
NO
Check signal flow circuit from
IC251 to IC252.
Is 12V obtained at IC252
pin#16?
Is AV2 Audio signal output at
IC252 pin#3,13?
Check POWER circuit.
NO
YES
NO
IC601 pin#31 is L?
pin# 21 is L?
Is about 3.5V obtained at
IC252 pin#9?
Is about 3.5V obtained at IC252
pin#10 ?
Replace IC252.
Check IC601.
Check R646, R647, R911,
R913
NO
NO
C at Q904 is L or H?
YES
Check
IC601.
Check Output JACK.
Check Q904,
Q905,R937,R938,
R939
H
H
L
L
YES
YES
YES
A. c. AV2 E-E
No sound in AV2 E-E
mode.
Is 12V obtained at IC251
pin#34?
NO
Is 5V obtained at IC251
pin#40?
Check POWER circuit.
YES
NO
Are CLK and DATA obtained at IC251
pin#42, 43?
Check Input JACK.
(Scart AV2)
Replace IC251.
NO
Is AV2 Audio signal output at
IC251 pin#16, 17?
Is there Audio at IC251
pin#8,9 in AV2 mode?
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...
