Lexmark 4076-0XX manual Power Service Check, Fru Or Procedure, Action, Diagnostic Information

4076-0XX

Power Service Check

	FRU OR PROCEDURE	ACTION
1	Power Supply	Disconnect J11 from the system
		board and check the following volt-
		ages on the power supply cable:
		J11-1 to GND = +5V dc
		J11-3 to GND = +24 V dc
		If you do not have correct voltage,
		replace the power supply. Be sure to
		unplug the machine before you recon-
		nect the power supply to the system
		board.
2	Operator Panel	With the power button depressed,
		check for 0 ohms at J10-11 on the
		front of the operator panel connector.
		If the reading is incorrect, check the
		operator panel cable for continuity. If
		the cable has continuity, replace the
		operator panel.
3	Print Head Cable	Turn off the printer. Disconnect one of
	Simm Card	the listed components and turn on the
	Parallel Cable	printer. Look for a symptom change.
		Check the failing part for shorts and
		replace as necessary. Repeat this
		procedure for the remaining listed
		parts.
4	System Board	If the symptom has not changed,
		replace the system board.

Diagnostic Information 19