Lexmark 1020 manual Parallel Port Service Check, Power Service Check

4078-00X

Parallel Port 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 . If the test
		fails, replace the system board.
Power Service Check

	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	Turn off the printer. Disconnect one of the
	Carrier Home	printhead cables and turn on the printer. Look for a
	Sensor	symptom change. Check the failing part for shorts
	Parallel Cable	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.

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