Lexmark X 850 Owners Manual

Diagnostic information2-163
7500-XXX
925.00 Fuser operating temperature failure 
927.00 PC cartridge RFID data write failure
3 Perform a print test.
Does the error continue?Replace the 
printer engine card 
assembly.
Go to “Printer 
engine card 
assembly 
removal” on 
page 4-117.Problem solved.
Step Check Yes No
1 Check the fuser unit assembly for a media jam.
Open the printer left door assembly and check it.
Is there a media jam in the fuser unit assembly?Go to the step 2. Remove the 
media.
2 Leave the...

2-164MFP Service Manual 7500-XXX
928.00 PC cartridge RFID communication failure
929.00 Sensor (ATC) failure
930.00 Laser power failure
3 Check the sensor (RFID PC cartridge) connection.
Is the sensor (RFID PC cartridge) properly connected?Replace the 
sensor (RFID PC 
cartridge). Replace the 
connection.
4 Perform a print test.
Does the error continue?Replace the 
printer engine card 
assembly.
Go to “Printer 
engine card 
assembly 
removal” on 
page 4-117.Problem solved.
Step Check Yes No
1 Check the PC...

Diagnostic information2-165
7500-XXX
932.00 Toner cartridge RFID data write failure
933.00 Toner cartridge RFID communication failure
2 Check the printhead assembly connection.
Is the printhead assembly properly connected?Replace the 
printhead. Replace the 
connection.
3 Perform a print test.
Does the error continue?Replace the 
printer engine card 
assembly.
Go to “Printer 
engine card 
assembly 
removal” on 
page 4-117.Problem solved.
4 Perform a print test.
Does the error continue?Replace the RIP...

2-166MFP Service Manual 7500-XXX
939.00 RIP card assembly communication failure
941.00 Media tray 1 lift up / no media tray failure
4 Perform a print test.
Does the error continue?Replace the 
printer engine card 
assembly.
Go to “Printer 
engine card 
assembly 
removal” on 
page 4-117.Problem solved.
Step Check Yes No
1 Perform a POR.
Does the error occur when the power is turned off/on?Go to step 2. Perform several 
print tests. 
If the problem 
remains, go to 
step 2.
2 Turn the printer off for 60...

Diagnostic information2-167
7500-XXX
4
Check the tray 1 media feed lift motor for proper operation. 
Warning: Only perform this test with the paper tray 
assembly removed from the machine, or abnormal grinding 
noises will occur.
1. Enter the Diagnostics Menu.
2. Touch MOTOR TESTS. 
3. Touch Printer Tests. 
4. Touch Tray 1 lift mtr.
Does the tray 1 media feed lift motor operate properly?Go to step 8. Go to step 5.
5 Is the tray 1 media feed lift motor properly  connected? Replace the media 
feed lift...

2-168MFP Service Manual 7500-XXX
942.00 Media tray 2 lift up / no media tray failure
Step Check Yes No
1 Check the media.
Pull out media tray 2 to visually check it. 
Is media loaded in tray 2?Go to step 2. Load media 
properly.
2 Check the media tray. 
Replace media tray 2 with media tray 1.
Is the replaced media tray lifted up?Go to step 3.  Go to step 4.
3 Check the media tray.
Are the tray lift sector gear 12T, of media tray 2, or 
surrounding parts damaged?Replace the media 
tray lift sector gear...

Diagnostic information2-169
7500-XXX
943.00 Tray 3 lift up / no tray failure
8 Check the tray 2 switch (media size) for proper connection.
Is the switch connected properly?Replace the switch 
(media size).
Go to “Switch 
(media size) 
removal” on 
page 4-19.Replace the 
connection.
8 Perform a print test.
Does the error continue?Replace the 
printer engine card 
assembly.
Go to “Printer 
engine card 
assembly 
removal” on 
page 4-117.Problem solved.
StepCheckYe sNo
1Check the media.
Pull out tray 3, and...

2-170MFP Service Manual 7500-XXX
944.00 Tray 4 lift up / no tray failure
6Check the tray 3 sensor (media level) for proper 
operation.
1. Enter the Diagnostics Menu.
2. Touch INPUT TRAY TESTS.
3. Touch Sensor Test.
4. Touch Tr a y  3 .  
5. Touch Media level.
Remove the media tray assembly, and move the pick 
roll with your finger in an up and down motion. Avoid 
touching the rubber roll surface.
Does the display on the operator panel change every 
time the sensing area of the above sensor is blocked?Go...

Diagnostic information2-171
7500-XXX
2Check the tray.
Are the tray 4 lift gear assembly or the surrounding 
parts of it damaged?Go to step 3.Replace the tray 4 
lift gear assembly or 
the obstacles.
Go to “2000-sheet 
dual input (TTM)–
tray 4 lift gear 
assembly removal” 
on page 4-272.
3Check the tray 4 media feed lift motor for proper 
operation. 
Warning: Only perform this test with the paper tray 
assembly removed from the machine, or abnormal 
grinding noises will occur.
1. Enter the Diagnostics...

2-172MFP Service Manual 7500-XXX
950.00 through 950.29 EPROM mismatch failure
9Perform a print test.
Does the error still occur?Replace the 2TM/
TTM controller card 
assembly. 
Go to “2000-sheet 
dual input (TTM)–
2TM/TTM controller 
card assembly 
removal” on 
page 4-274.
Go to step 10.Problem solved.
10Perform a print test.
Does the error still occur?Replace the printer 
engine card 
assembly.
Go to “Printer 
engine card 
assembly removal” 
on page 4-117.Problem solved.
Warning: In the event of...