DAEWOO DVS123A
Instrukcja Serwisowa

TROUBLE SHOOTING GUIDE

E-2. PREAMP IN THE PAYBACKMODE
Is signal from heads fed to pin1 and 3 of P401?
YES NO

Check the DRUM and DECK mechanism

Is ON/OFF5V from pin76 of IC301 supplied to pin131 of IC401 at 5V?
YES

NO

Check the ON/OFF 5V

Is REC(H) from pin79 of IC501 supplied to pin11 of IC401 at 0V?
YES

NO

Check Q503, Q504 and adjacent circuit

Is V.SW pulse from pin46 of IC501 supplied to pin4 of IC401?
YES

NO

Check SERVO/SYSCON

Is the signal from pin1 and 3 of P401 fed to pin17 or 19 of IC401?
YES

NO

Change IC401

Is the signal from pin7 of IC401 fed to C416?
YES

NO

Check Q401 and adjacent circuit

TO LUMINANCE SIGNAL IN THE REC MODE

NOTE : 1) REC(H) : "HIGH" in the REC mode. "LOW" in the EE and PB mode

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