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Manual - Maintenance Electronique / Monitors Service Center

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7 Troubleshooting<br />

7-1-14 ABL Failure<br />

46<br />

Input full white pattern to monitor.<br />

Does the IC104 Pin 15 input<br />

vary with different patterns?<br />

(Crosshatch)<br />

No<br />

Check CN101 Pin 23 and<br />

CN221 Pin 23.<br />

Is the T502 Pin 8 waveform<br />

correct?<br />

Yes<br />

Does the IC221 Pin 23 output<br />

level vary with different pattern?<br />

(Crosshatch)<br />

Yes<br />

Check and replace Q201,<br />

Q202 and +12 V line.<br />

Yes<br />

No<br />

No<br />

Check and replace IC104.<br />

Check and replace T502.<br />

Check and replace IC201.<br />

WAVEFORMS<br />

46<br />

3.62 V (T502, #8)<br />

CH1 P-P = 3.62 V CH1 RMS = 3.330 V<br />

7-8 SyncMaster 1000s (CGP1607L)

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