Lexmark 4026-0XX manual Low Voltage Power Supply Service Check, Dead Printer, 2-22

4026-0XX

Low Voltage Power Supply Service Check

Note: The controller board, HVPS and printhead assembly receive power from the LVPS through the engine board.

If the machine is dead, be sure the controller board is correctly seated in the engine board connector.

Check and reseat all cables.

Dead Printer

	FRU	Action
1	Line Voltage	Check the AC line voltage. The voltages should
		be within the following limits:
		100 V ac (90 V ac - 110 V ac) Japan
		120 V ac (108 V ac - 132 V ac) U.S.
		220/230 V ac (207 V ac - 253 V ac) W.T.
2	LVPS	The voltage measures approximately +5 V dc
		between CN7-4 and ground on the engine
		board. If incorrect, disconnect CN7 on the
		engine board and measure the voltage between
		CN7-4 (+5 V dc) and CN7-3 (+5 V ground). The
		reading should measure approximately +5 V dc.
		If +5 V dc is not present, unplug the printer line
		cord and check fuse F1. If the fuse is open,
		replace the fuse. If the fuse is not open, replace
		the LVPS.
3	Engine Board	If +5 V dc is present when CN7 is disconnected
		then disconnect CN2, CN4, CN5, CN9 and
		CN10 from the engine board. Also disconnect
		the controller board and remove the ROM SIMM
		and any optional memory SIMMs. Reconnect
		CN7 and check for +5 V dc. If incorrect, replace
		the engine board.
4	Controller	Reinstall the controller board. Check for +5 V dc
	Board	at CN7-4. If incorrect, replace the controller
		board.

2-22