Lexmark X 850 Owners Manual

Diagnostic information2-83
7500-XXX
2Check the media size setup.
Does the media size in use match the size set for 
tray 4?Go to step 3.Replace the media 
or change the media 
size setup.
3Check the tray 4 rolls.
Pull out tray 4, and check it.
Are the feed roll, separation roll, and pick roll for 
transport free of excess wear and contamination?Go to step 4.Clean or replace the 
feed roll, separation 
roll, and pick roll.
Go to “2000-sheet 
dual input (TTM)–
feed roll removal” 
on page 4-259,...

2-84MFP Service Manual 7500-XXX
244.05 Sensor (tray 4 feed-out) static jam 
10Check the tray 4 media feed lift motor for proper 
operation. 
Replace the media feed lift motor for tray 4 with that for 
tray 3. 
1. Enter the Diagnostics Menu.
2. Touch MOTOR TESTS.
3. Touch Printer Motor Test.
4. Touch Tray 4 feed mtr.
Does the above motor rotate normally?Reinstall the media 
feed lift motor for 
tray 3 as it 
previously was, and 
then replace the 
media feed lift motor 
for tray 4 with a new 
one.
Go to...

Diagnostic information2-85
7500-XXX
250.00 Sensor (registration) on jam (MPF pick) 
3Check the sensor (tray 4 feed-out) for proper 
connection.
Is the above sensor connected properly?Replace the sensor 
(tray 4 feed-out).
Go to “2000-sheet 
dual input (TTM)–
sensor (tray 4 feed-
out) removal” on 
page 4-241.Replace the 
connection.
4Perform 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...

2-86MFP Service Manual 7500-XXX
6 Check the roll. 
Remove the MPF pick unit asm.
Is the MPF feed roll assembly free of excess wear and 
contamination?Go to step 7. Clean or replace 
the MPF feed roll 
assembly.
Go to “MPF feed 
unit assembly 
removal” on 
page 4-54.
7 Check the roll.
Remove the MPF feed unit assembly.
Is the MPF feed roll assembly free of excess wear and 
contamination?Go to step 8. Clean or replace 
the MPF feed roll 
assembly.
Go to “MPF feed 
unit assembly 
removal” on 
page 4-54.
8...

Diagnostic information2-87
7500-XXX
290.00 Switch (sheet through) static jam
290.01 Sensor (sheet through) on jam
Step Check Yes No
1 Check the sensor (sheet through).
Is the feed media path free of media or media fragments?Go to step 2. Remove any 
media or media 
fragments.
2 Check the sensor (sheet through) for operation. 
Perform the sensor (sheet through) test.
Open the ADF left cover assembly.
Remove the ADF rear cover. Go to “ADF rear cover 
removal” on page 4-165.
1. Enter the Diagnostics Menu....

2-88MFP Service Manual 7500-XXX
2 Check the ADF rolls for wear.
Is the ADF feed/pick roll assembly or the ADF separation roll 
assembly free of excess wear?Go to step 3. Clean or replace 
the ADF feed/pick 
roll assembly or 
the ADF 
separation roll 
guide assembly.
Go to “ADF feed/
pick roll 
assembly 
removal” on 
page 4-178 or 
“ADF separation 
roll guide 
assembly” on 
page 4-195.
3 Check the media path for contaminates.
Is the media path free of excess media dust and foreign 
objects such as paper...

Diagnostic information2-89
7500-XXX
7 Check the feed drive motor connection.
Is the above motor connected properly?Replace the ADF 
feed drive motor 
assembly.
Go to “ADF feed 
drive motor 
assembly 
removal” on 
page 4-172.Replace the 
connection.
8 Check the sensor (sheet through) for operation. 
Perform the sensor (sheet through) test.
Open the ADF left cover assembly.
Remove the ADF rear cover. Go to “ADF rear cover 
removal” on page 4-165.
1. Enter the Diagnostics Menu.
2. Touch SCANNER TESTS.
3....

2-90MFP Service Manual 7500-XXX
290.02 Sensor (ADF pre-registration) on jam ADF simplex side 1
Step Check Yes No
1 Check the original document condition.
Is the original document free of paper clips and staples as 
well as damage such as creases, tears, holes or excessive 
wear?Go to step 2. Remove damaged 
original document 
and replace with a 
new undamaged 
original document. 
Perform a ADF 
test. If the 
problem remains, 
go to step 2.
2 Open the ADF left cover assembly and inspect the 
document set...

Diagnostic information2-91
7500-XXX
5 Check the sensor (ADF pre registration) for operation.
Perform the sensor (ADF pre registration) test.
Open the ADF left cover assembly.
1. Enter the Diagnostics Menu.
2. Touch SCANNER TESTS.
3. Touch Sensor Tests.
4. Touch ADF pre registration.
Operate the actuator of the sensor (ADF pre registration).
Does the display on the operator panel change every time 
the sensing area of the above sensor is blocked?Go to step 7. Go to step 6.
6 Check the sensor (ADF...

2-92MFP Service Manual 7500-XXX
290.03 Sensor (ADF pre-registration) off jam
Step Check Yes No
1 Check the original document condition.
Is the original document free of paper clips and staples as 
well as damage such as creases, tears, holes or excessive 
wear?Go to step 2. Remove damaged 
original document 
and replace with a 
new undamaged 
original document. 
Perform a ADF 
test. If the problem 
remains, go to 
step 2.
2 Check the ADF rolls for wear.
Is the ADF feed/pick roll assembly or the ADF...