Lexmark X543 Service Manual

Diagnostic information2-37
Lexmark confidential until announce7525xxx
Dead printer service check
A dead printer is a condition where the display is blank, the LED on the operator panel is off, the fan does not 
turn, no motors turn, and the fuser does not heat.
If a 650-sheet Duo Drawer is installed, remove the option and check the base printer for correct operation. If the 
base printer operates correctly, replace the 650-sheet Duo Drawer.
Warning:Observe all necessary ESD precautions when removing and...

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Duplex/manual feed sensor (S1) service check
Note:  Before performing this service check, ensure that the printer is on a hard level surface.
Step Questions / actions Yes No
1Enter Diagnostics Menu (turn the printer off, 
press and hold   and  , turn the printer on, 
and then release the buttons when the 
installed memory and processor speed 
displays).
Perform the Base Sensor Test. See “Base 
Sensor Test” on page 3-18. 
1. Select Base Sensor...

Diagnostic information2-39
Lexmark confidential until announce7525xxx
Front door sensor or switches service check
Step Questions / actions Yes No
1Enter Diagnostics Menu (turn the printer off, press 
and hold   and  , turn the printer on, and then 
release the buttons when the installed memory and 
processor speed displays).
Perform the Base Sensor Test. See “Base Sensor 
Test” on page 3-18. 
1. Select Base Sensor Test, and press Select 
().
2. Select Front Door, and press Select ().
3. Open and close...

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Fuser exit sensor service check
Step Questions / actions Yes No
1Enter Diagnostics Menu (turn the printer off, 
press and hold   and  , turn the printer on, 
and then release the buttons when the 
installed memory and processor speed 
displays).
Perform the Base Sensor Test. See “Base 
Sensor Test” on page 3-18. 
1. Select Base Sensor Test, and press 
Select ().
2. Select Fuser Exit Sensor, and press 
Select ().
3. Open and close the front...

Diagnostic information2-41
Lexmark confidential until announce7525xxx
Fuser service check
Step Questions / actions Yes No
1Some low-voltage power supply FRUs have a 
voltage selector switch. If it does, the switch 
needs to be set to the correct voltage for your 
area
Has the LVPS been changed?Check the switch on the side 
of the LVPS to verify the 
correct voltage is set.Go to step 2.
2Turn the printer off, and remove the rear shield. 
See “Rear shield removal” on page 4-7. 
Check the cable at JFUSES1...

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Input sensor (S2) service check
The Input sensor (S2) is part of the ACM FRU.
Step Questions / actions Yes No
1Enter Diagnostics Menu (turn the printer off, 
press and hold   and  , turn the printer on, 
and then release the buttons when the 
installed memory and processor speed 
displays).
Perform the Base Sensor Test. See “Base 
Sensor Test” on page 3-18. 
1. Select Base Sensor Test, and press 
Select ().
2. Select S2, and press Select ()....

Diagnostic information2-43
Lexmark confidential until announce7525xxx
Main drive gear assembly (EP drive) service check
Step Questions / actions Yes No
1Turn the printer off, and remove the rear shield. 
See “Rear shield removal” on page 4-7. 
Check the cable at JCARTB1 for proper 
connection to the controller board, the cable for 
pinch points, and the cable or connector for 
any other damage.
Is the cable damaged?Replace the JCARTB1 
cable.Go to step 2.
2Disconnect the cable at JCARTB1 on the...

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Operator panel service check
Warning:Replace one of the following components, and perform a POR before replacing a second 
component. Never replace both of the components without performing a POR after installing each 
one, or the printer will be rendered inoperable:
Operator panel assembly
Controller board
Warning:Never install and remove components listed above as a method of troubleshooting components. 
Once a component has been installed...

Diagnostic information2-45
Lexmark confidential until announce7525xxx
Operator panel display blank, printer beeps five times and pauses
2Turn the printer off, and remove the rear shield. 
See “Rear shield removal” on page 4-7. 
Disconnect the operator panel assembly cable 
at JOPP1 on the controller board. Turn on the 
printer, and verify the following voltages:
Are the voltage values approximately correct?Go to step 3. Replace the controller 
board. See “Controller 
board removal” on 
page 4-16. 
3Check...

2-46Service Manual 7525xxxLexmark confidential until announce
Operator panel displays all diamonds, no beeps
Operator panel displays all diamonds, five beeps
Step Questions / actions Yes No
1Turn off the printer, and remove the rear shield. 
See “Rear shield removal” on page 4-7. 
Disconnect the cable at JOPP1 on the 
controller board. Verify the following values:
Are all these values approximately correct?Go to step 2. Replace the controller 
board. See “Controller 
board removal” on 
page 4-16.
2Check...