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4078-00X
Parallel Port Service Check
Power Service Check
FRU Action
1 Parallel Port Run a test page to be sure the printer can print.
Run the “Parallel Port Test” on page 3-4.Ifthetest
fails, replace the system board.
FRU Action
1 Power Supply Disconnect CN7 from the system board and check
the following voltages on the power supply cable:
• CN7-1 to GND = +5 V dc
• CN7-4 to GND = +24 V dc
If you do not have correct voltage, replace the
power supply. Be sure to unplug the machine
before you reconnect the power supply to the
system board.
2 Printhead Cable
Carrier Home
Sensor
Parallel Cable
Turn off the printer. Disconnect one of the
printhead cables and turn on 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
and parallel cable.
3 System Board If the symptom has not changed, replace the
system board.