6-6
Phaser 600 Color Printer
6
Troubleshooting
Testing for a shorted DC supply
1.
Turn the printer off.
2.
Disconnect the two wiring harness, CN3 and CN4, connecting the
power supply to the engine control board.
3.
Turn the power supply back on.
4.
Measure the DC output test points. If the DC voltages measure OK,
the power supply is being shorted out, proceed to the next procedure,
“Testing for a shorted motor”. If the DC voltages are incorrect, then
the power supply has failed; replace the power supply.
Testing for a shorted motor
An over-current condition in the +12 volt or +5 volt supplies will shut all DC
outputs. An over-current in the HV+, HV-, -12 volt or +40 volt supplies only
shuts down the affected supply.
Note
A short-circuited DC output will shut down the power supply for 5
minutes. It will not start until 5 minutes have elapsed.
1.
Turn the printer off.
2.
Reconnect the wiring harnesses removed in the previous procedure.
3.
Disconnect the AC motors: Y-axis motor, X-axis motor, and fuser
motor by disconnecting J112 from the engine control board.
4.
Disconnect the stepper motors: exit motor, head maintenance cam
gear motor, head to media motor and the ink loader motor by
disconnecting their individual wiring harnesses from the junction
boards. The wiring diagrams in Appendix C show this connections.
5.
Turn on the printer again to see if it does not overload now that the
motors are disconnected from the power supply. The cooling fans will
rotate if the +5 and +12 volt supplies are operating correctly.
If the power supply is functional, move to the procedure, “Testing motor and
solenoid resistances” on page 6-7.
If the motors, fans and solenoids are working properly, but the power supply
still does not function, replace it. Refer to the Chapter 8 topic, “Power supply”
on page 8-55.
Measure for a +5 volt short at J101 pins 1 and 3. If a short is found, replace the
engine control board.
Measure for a +12 volt short at J101 pins 1 and 6. If a short is found, replace the
cooling fan.
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