Low Voltage Power Supply Service Check - Lexmark Optra E 4026-0XX Service Manual

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
1 Line Voltage
LVPS
2
3 Engine Board
4 Controller
Board
2-22
Action
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.
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.
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.
Reinstall the controller board. Check for +5 V dc
at CN7-4. If incorrect, replace the controller
board.