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4091-001
Power Service Check
FRU
1
External Power
Supply
2
DC/DC Converter
3
Printhead Cable
Carrier Home
Sensor
Parallel Cable
Paper feed motor
Carrier transport
motor
4
System Board
Action
Disconnect the power supply from the DC/DC
converter. Plug the external power supply into an
outlet. Check for + 24 V dc. If you do not have
correct voltage, replace the external power supply.
Disconnect CN8 from the system board and check
the following voltages on the DC/DC Converter
cable:
• CN8-2 to GND = +24 V dc
• CN8-4 to GND = + 5 V dc
If you do not have correct voltage, replace the
DC/DC Converter. Be sure to unplug the machine
before you reconnect the DC/DC Converter to the
system board.
Unplug the printer. Disconnect one of the
printhead cables and plug in the printer. Look for a
symptom change. Check the failing part for shorts
and replace as necessary.
Repeat this procedure for the carrier home sensor,
parallel cable, carrier transport motor and paper
feed motor.
If the symptom has not changed, replace the
system board.
Diagnostic Information 2-9
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