Lexmark X748dte - Dead Printer Service Check

Diagnostic information 2-149
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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.
Warning: Observe all necessary ESD precautions when removing and handling the system board or any
installed option cards or assemblies. See “Handling ESD-sensitive parts” on page 4-1.
Remove any input and output paper handling options from the printer.
Step Questions / actions Yes No
1 Check the AC line voltage.
Is the line voltage correct?
Go to step 2. Inform the customer.
2
Is the AC line cord damaged? Replace the line cord. Go to step 3.
3
Check the system board for +5 V dc between
JLVPS2 pin 1 and ground.
Is the voltage correct?
Replace the system board.
See “System board
removal” on page 4-165.
Go to step 4.
4
Is the JLVPS2 cable correctly installed at
JLVPS2 on the system board?
Go to step 5. Reseat the JLVPS2 cable.
5
1. Turn the printer off.
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?
Go to step 6. Replace the LVPS. See
“Low-voltage power
supply (LVPS) removal”
on page 4-123.
6
1. Turn the printer off.
2. Disconnect cables J5, JCARTS1.
JCARTS2, JDVR1, JFDPCK1, JFUSER1,
JINT1, JOPT1, and JTLB%1.
3. Connect the JLVPS2 cable to the system
board. Remove one option/feature at a
time, and then turn the printer on to isolate
the failing part.
Warning: Observe all the ESD precautions
(see “Handling ESD-sensitive parts” on
page 4-1) and turn the printer off before any
feature or option cards are removed or
replaced.
Is a failing part found?
Contact your next level of
support. Replace the faulty
part.
Go to step 7.
7
Connect one cable at a time and POR the
printer.
Is the printer still dead?
The part connect to that
cable is faulty. Replace the
failing part.
Connect another cable,
and then continue with this
step.
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.