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4078-00X
Parallel Port Service Check
FRU
1
Parallel Port
Power Service Check
FRU
1
Power Supply
2
Printhead Cable
Carrier Home
Sensor
Parallel Cable
3
System Board
2-12
Action
Run a test page to be sure the printer can print.
Run the
"Parallel Port Test" on page
fails, replace the system board.
Action
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.
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.
If the symptom has not changed, replace the
system board.
3-4. If the test
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