Dead Printer Service Check - Lexmark C734dn Service Manual

5026

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?
A
Turn the printer off. Disconnect the JLVPS2
5
cable from the system board. Turn the printer
on, and then measure the voltage between
the JLVPS2 cable pin 1 and the JLVPS2
pin 14 (black wire).
Does this measure approximately +5 V dc?
1. Turn the printer off.
6
2. Disconnect the cables in J5, JCARTS1,
JCARTS2, JDVR1, JFDPCK1, JFUSER1,
JINT1, JOPT1, and JTLBT1.
3. Connect the JLVPS2 cable to the system
board.
4. POR the printer.
Does the printer still appear dead?
1. Connect one cable at a time, and POR the
7
printer.
2. Is the printer dead?
Service Manual
2-126
"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
Go to step 5.
1 JFUSER1 1 1 JHVPS1 1 JBLW1 1
1 JBIN1
1 1 1
JSB1 JFAN1 JBOR1 JMIRR1 JOPP1
1
JCVR1
F5
F6 JT1
JLVPS2
1
JCARTP1 F7
J49
1
JCARTS1
1
1
JBOOT1
JUSB1
JDIMM1 1
F9
J10
JCARTS2
1
JTLBT1
JCARTP2 1 1
1 JTWF1 JFMUSB1
1
F10
JDVR1 JTDBUG1
1 1
JTPS1
1
JOPT1 J5
1 JDX1
1 F13 1
1 JFDS1
F12
JINT1 F14
1
JFDPCK1 JTRAY1 JSEC1 JPH1
1 1 JT12
Go to step 6.
Contact your next level of
support.
The part connected to that
cable is faulty. Replace the
failing part.
4-2.
No
Inform the customer.
Go to step 3.
Go to step 4.
4-153.
Reseat the JLVPS1 cable.
Replace the LVPS. See
"Low-voltage power
supply (LVPS) removal"
on page 4-112.
Go to step 7.
Connect another cable and
continue with this step.
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