5 Troubleshooting
720C/920C 5-7
5-1-12 V Size or Pos. Variation Failure
IC261 Pin 23 output varies with
different DAC values?
Yes
Check some parts around IC301.
Check bias voltage.
Check and replace IC261 and IC301.
No
5-1-13 High Voltage Failure
Q524 gate driving pulse exist?
Check +12 V line.
Check and replace Q521, Q522, Q523,
Q524 and IC501.
Yes
No
Done
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