19
TROUBLE SHOOTING GUIDE
E-2. PREAMP IN THE PAYBACKMODE
NOTE : 1) REC(H) : "HIGH" in the REC mode.
"LOW" in the EE and PB mode
Is signal from heads fed to
pin1 and 3 of P401?
NO
Check the DRUM and
DECK mechanism
YES
Is ON/OFF5V from pin76
of IC301 supplied to
pin131 of IC401 at 5V?
NO
Check the ON/OFF 5V
YES
Is REC(H) from pin79 of
IC501 supplied to pin11
of IC401 at 0V?
NO
Check Q503, Q504 and
adjacent circuit
YES
Is V.SW pulse from pin46
of IC501 supplied to
pin4 of IC401?
NO
Check SERVO/SYSCON
YES
Is the signal from pin1 and
3 of P401 fed to pin17
or 19 of IC401?
NO
Change IC401
YES
Is the signal from pin7 of
IC401 fed to C416?
NO
Check Q401 and adjacent
circuit
YES
TO LUMINANCE
SIGNAL IN THE REC
MODE
All manuals and user guides at all-guides.com
Summary of Contents for DV-S123W Series
Page 33: ...32 PRINTED CIRCUIT BOARD 1 PCB MAIN All manuals and user guides at all guides com...
Page 34: ...33 PRINTED CIRCUIT BOARD 2 PCB POWER SMPS All manuals and user guides at all guides com...
Page 40: ...39 EXPLODING VIEWS PARTS LIST 1 PACKING AS All manuals and user guides at all guides com...
