Lexmark X543 Service Manual

Diagnostic information2-27
Lexmark confidential until announce7525xxx
990.xx Ser vice
This error message indicates that an 
equipment check condition has 
occurred in the specified device, but 
the device is unable to identify the 
exact component failure. 
Note:  can be one of the 
following:
 Duplex option.

991.xx Ser vice
 CardThe specified device has detected an 
equipment check in its controller board.
Service error messages (1XX, 8XX and 9xx) (continued)
Error code Description Action 

2-28Service Manual 7525xxxLexmark confidential until announce
Fax error log codes
Fax error log codes
Error code Description Action
000No error occurred during fax
transmissionNo action needed
200 Error occurred when transmitting
training. Check line quality.
 Select a lower ‘Max Speed’.
 value under Fax Send settings
 Adjust the transmit level.
3XX Error occurred when receiving
image data. Check line quality.
 Adjust ‘Receive Threshold’.
 Select a lower ‘Max Speed’ value 
under Fax Receive settings.
4XX...

Diagnostic information2-29
Lexmark confidential until announce7525xxx
80A T5 Timeout occurred when transmitting 
image data to remote fax device. Check line quality.
 Adjust ‘Transmit Level’.
 Select a lower ‘Max Speed’value under 
Fax Send settings.
80B Too many errors when transmitting in 
ECM mode. Check line quality.
 Adjust ‘Transmit Level’.
 Select a lower ‘Max Speed’value under 
Fax Send settings.
80C Remote device failed to respond to the 
CTC command. Select a lower ‘Max Speed’ value 
under Fax...

2-30Service Manual 7525xxxLexmark confidential until announce
882 Failure to transmit training successfully 
in V17, V29 terminal modulation 
schemes. Select a lower “Max Speed” under Fax 
Send settings.
 Adjust the “Transmit Level”.
 Check line quality.
883 Failure to transmit training successfully 
in V17,V27 terminal modulation 
schemes. Select a lower “Max Speed” under Fax 
Send settings.
 Adjust the “Transmit Level”.
 Check line quality.
884 Failure to transmit training successfully 
in V29, V27...

Diagnostic information2-31
Lexmark confidential until announce7525xxx
907 Modem detected a digital line 
connection.Verify the MFP is connected to an analog 
line. See“Fax transmission service 
check” on page 2-71. 
908 Phone line was disconnected Restore phone line connection.
A00 Received request for unsupported 
function from remote fax device.No action needed.
A01 Received request for unsupported 
image width from remote fax device.No action needed.
A02 Received request for unsupported 
image...

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Service checks 
Autocompensator mechanism service check
90x.xx error
920.xx–923.xx—Fuser temperature incorrect
This service check covers fuser temperature errors, including 920.xx, 921.xx, 922.xx, and 923.xx. Step Questions / actions Yes No
1Turn the printer off, and then remove the rear 
shield. See “Rear shield removal” on 
page 4-7. Check the cable at JSP1 on the 
controller board for proper connection.
Is the cable properly connected?Go to...

Diagnostic information2-33
Lexmark confidential until announce7525xxx
925.01—Fan error service check
3Turn the printer on and check following values 
on JFUSES1.
Are the values approximately correct?Replace the fuser assembly. 
See “Fuser assembly 
removal” on page 4-19.Replace the controller 
board. See “Controller 
board removal” on 
page 4-16.
Step Questions / actions Yes No
1Turn off the printer, and remove the rear shield. 
See “Rear shield removal” on page 4-7. 
Unplug the fan cable at JFAN1 and...

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930.xx–935.xx—Printhead errors service check
936.xx, 937.xx—Transport motor 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 cables connected at JMIRR1 and 
JPH1 on the controller board. Check for 
damage.
Are the cables damaged?Replace the printhead. See 
“Printhead removal” on 
page 4-42.Go to step 2.
2Turn the printer on, and verify the...

Diagnostic information2-35
Lexmark confidential until announce7525xxx
950.xx EPROM mismatch failure 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...

2-36Service Manual 7525xxxLexmark confidential until announce
Bin full sensor service check
Step Questions / actions Yes No
1Is the input sensor dislodged or damaged? Repair or replace the 
autocompensator 
mechanism. See 
“Autocompensator 
mechanism (ACM)—
standard tray removal” on 
page 4-12. Go to step 2.
2Does the flag rotate freely and interrupt the 
sensor beam when in normal position?Go to step 3. Reposition or replace the 
flag.
3Turn the printer off, and remove the rear shield. 
See “Rear shield...