Xerox Phaser 8400 Service Manual page 119

8400 PEST Description
37,049.40: Power supply -12 volt over limit.
37,050.41: Power supply -12 volt under limit.
37,051.42: Power supply current over limit.
37,052.43: Power supply current under limit.
37,053.44: Power supply +50 volt over limit.
37,054.45: Power supply +50 volt under limit.
37,055.46: Power supply -50 volt over limit.
37,056.47: Power supply -50 volt under limit.
37,057.48: Power supply +15 volt over limit.
37,058.40: Power supply +15 volt under limit.
37,059.41: Power supply -15 volt over limit.
37,060.42: Power supply -15 volt under limit.
37,061.43: Power supply high switch will not
activate. 12, 15, and 50 volt missing.
This may be due to a short or
disconnected power supply reset line.
37,062.44: Vss measurement too low. The
printhead power cable may be
disconnected.
37,063.45: Vpp measurement too low. The
printhead power cable may be
disconnected.
37,064.46:
37,065.47:
37,066.48:
Service Manual
8500/8550 PEST description
Power supply -12 volt over limit.
Power supply -12 volt under limit.
Power supply current over limit.
Power supply current under limit.
Power supply +50 volt over limit.
Power supply +50 volt under limit.
Power supply -50 volt over limit.
Power supply -50 volt under limit.
Power supply +15 volt over limit.
Power supply +15 volt under limit.
Power supply -15 volt over limit.
Power supply -15 volt under limit.
Power supply +5 volt over limit.
Power supply +5 volt under limit.
Power supply high switch will not
activate. 12, 15, and 50 volt missing.
This may be due to a short or
disconnected power supply reset line.
Vss measurement too low. The
printhead power cable may be
disconnected.
Vpp measurement too low, head
power cable may be disconnected.
Wave amp drive cable may be
damaged or disconnected at head
driver board or wave amp board.
The wave amp appears to be
shorted. It is drawing to much power.
Check for bad wave amp drive cable
(lifted ends of conductors).
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