TOSHIBA SD34
Circuit Diagrams

NO 5VT.
YES

No 3.3V.
YES

(TO DVD)

Is the Vcc(5.3V) sup- NO plied to Q163 Emittor?
YES

Check or Replace the D118

Is there about 3.7V NO at the IC152 pin1?
YES

Check or Replace the D111

Is the Q164 Base �H�?
YES

NO

Check the TIMER �H� signal from µ-com

Is there about 3.3V~5V NO at the IC154 pin4?
YES

Check the PWR CTL H� signal from µ-com

Check or Replace the Q163

Check the IC152 Replace

No 12VA
YES

(To Cap, Drum Motor )

No REG 12VT
YES

Is the Vcc(13V) supplied to C123?
YES

NO

Check or Replace D110.

Is the Vcc(13V) supplied NO to Q156 Collector?
YES

Check or Replace the D110.

Is the D117/D115 Normal?
YES

NO

Check the D117/D115.

Is the Vcc(13V) sup- NO plied to Q156 Base?
YES

Check the TIMER �H� signal from µ-com

Check or Replace the Cap / Drum
YES

Check the 33V Line

Check or Replace the Q156.

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