Oki B4100 User Manual

Page 260

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40055101TH Rev.4

260 /

(5) No –8 V output

Yes

Yes

Yes

No

No

No

Replacement

Replacement

Replacement

1. Q1 short circuit
2. Q3 short circuit
3. R9 open circuit
4. D8, D9 or D10 short circuit

1. D10 open circuit
2. R23 short circuit

1. IC2 fault
2. C20 short circuit
3. Short circuit on load side

Is there oscillation

waveform at VCE of Q1?

Start

Is the output voltage

of C20 at -8V.

End

Is the voltage across

C19 at 9 V or more?

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