Dead Printer Service Check - Lexmark X734de Service Manual

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Dead printer service check

A dead printer is a condition where the display is blank, the LED on the operator panel is off, no fans turn, no
motors turn, and the fuser lamp does not come on.
If a 550-sheet option assembly is installed, remove the option, and check the base printer for correct operation.
If the base printer operates correctly, replace the 550-sheet option assembly.
Observe all necessary ESD precautions when removing and handling the system board or any
Warning:
installed option cards or assemblies. See
CAUTION
When you see this symbol, there is a danger from hazardous voltage in the area of the product
where you are working. Unplug the product before you begin, or use caution if the product
must receive power in order to perform the task.
Remove any input and output paper handling options from the printer.
Step Questions / actions
Check the AC line voltage.
1
Is the line voltage correct?
Is the AC line cord damaged?
2
Check the system board for +5 V dc between
3
JLVPS2 pin 1 and ground.
Is the voltage correct?
Is the JLVPS2 cable correctly installed at
4
JLVPS2 on the system board?
1. Turn the printer off.
5
2. Disconnect the JLVPS2 cable from the
system board.
3. Turn the printer on.
4. Measure the voltage between the JLVPS2
cable pin 1 and the JLVPS2 pin 14 (black
wire).
Does this measure approximately +5 V dc?
Service Manual
2-144
"Handling ESD-sensitive parts" on page
Yes
Go to step 2.
Replace the line cord.
Replace the system board.
See
"System board
removal" on page 4-165.
Go to step 5.
Go to step 6.
4-2.
No
Inform the customer.
Go to step 3.
Go to step 4.
Reseat the JLVPS2 cable.
Replace the LVPS. See
"Low-voltage power
supply (LVPS) removal"
on page 4-124.
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