Lexmark 25**-100, Service Manual

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2-30
Service Manual
25XX-100, -110
Power service check
FRU Action
1 Power supply If the carrier does not move to the left after
turning the printer off and then back on, be
sure the line cord voltage to the power supply
is correct and the power supply outputs are
+40 V dc at CN12-1, +40 V dc at CN12-2 and
+5 V dc at CN12-6.
If the voltages are incorrect:
• Check the internal fuse before replacing the
power supply. Generally if F1 is blown, it is
due to a short-circuit in the printhead;
replace the printhead and the fuse before
turning the power on again.
• Be sure the power supply cable from the
power supply to the logic board is not
damaged and is correctly installed.
2 Operator panel
Operator panel
cable If there is still a Power LED problem, check the
operator panel cable continuity and replace the
cable or the operator panel.
3 Carrier motor Disconnect the carrier motor from logic board
CN2, and turn the printer off and then back on.
If the Power LED lights correctly only with the
carrier motor disconnected, replace the carrier
motor.
4 Paper feed motor Disconnect the paper feed motor from logic
board CN1, and turn the printer off and then
back on. If the Power LED lights correctly only
with the paper feed motor disconnected,
replace the paper feed motor.
5 Printhead
Printhead cables Disconnect the printhead cable from the logic
board, and turn the printer on. If the Power
LED lights correctly only with the printhead
cables disconnected from the logic board,
there is a short-circuit in the printhead or
printhead cables.
Disconnect the printhead cable from the logic
board, and be sure none of the leads on the
cable are shorted to ground.