Power Service Check - Lexmark Forms Printer 2400 Service Manual

24xx

Power Service Check

FRU
1 Power Supply
2 Operator Panel
Operator Panel
Cable
3 Carrier Motor
4 Paper Feed Motor
5 Printhead
Printhead Cables
Action
If the carrier does not move to the left after
turning the printer off and then 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 in the printhead; replace the
printhead and the fuse before powering on
again.
• Be sure the power supply cable from the
power supply to the logic board is not
damaged and correctly installed.
If there is still a power LED problem, check the
operator panel cable continuity and replace the
cable or the operator panel.
Disconnect the carrier motor from logic board
CN2 and turn the printer off and then on. If the
power LED lights correctly only with the carrier
motor disconnected, replace the carrier motor.
Disconnect the paper feed motor from logic
board CN1 and turn the printer off and then on.
If the power LED lights correctly only with the
paper feed motor disconnected, replace the
paper feed motor.
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 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.
Diagnostic Information
2-27