Lexmark X 850 Owners Manual

Diagnostic information2-73
7500-XXX
243.04 Sensor (tray 3 feed-out) static jam 
9Check the sensor (tray 3 feed-out) for proper 
connection.
Is the above sensor connected properly?Replace the sensor 
(tray 3 feed-out).
Go to “2000-sheet 
dual input (TTM)–
sensor (tray 3 feed-
out) removal” on 
page 4-247.Replace the 
connection.
10Check the connection between the 2TM/TTM controller 
card assembly and the printer engine card assembly.
Are the above boards connected properly?Go to step 11.Replace the...

2-74MFP Service Manual 7500-XXX
244.00 Sensor (tray 4 feed-out) on jam (tray 4 media feed)
3Check the sensor (tray 3 feed-out) for proper 
connection.
Is the above sensor connected properly?Replace the sensor 
(tray 3 feed-out).
Go to “2000-sheet 
dual input (TTM)–
sensor (tray 3 feed-
out) removal” on 
page 4-247.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...

Diagnostic information2-75
7500-XXX
5Check the tray 4 sensor (pre-feed) for proper operation.
1. Enter the Diagnostics Menu.
2. Touch INPUT TRAY TESTS.
3. Touch Sensor Test.
4. Touch Tr a y  4 .  
5. Touch Feed-out.
Remove the media tray assembly.
Does the display on the operator panel change every 
time a white piece of paper is placed over the sensing 
area of the above sensor?Go to step 7.Go to step 6.
6Check the tray 4 sensor (pre-feed) for proper 
connection.
Is the above sensor connected...

2-76MFP Service Manual 7500-XXX
10Remove the tray 4 media transport assembly from the 
TTM. 
Go to “2000-sheet dual input (TTM)–tray 4 media 
transport assembly removal” on page 4-229.
Inspect the metal tab on the tray 4 media transport 
assembly as shown in the graphic below.
Is the metal tab on the tray 4 media transport assembly 
bent?Staighten the metal 
tab with needle nose 
plyiers or replace the 
tray 4 media 
transport assembly.
Go to “2000-sheet 
dual input (TTM)–
tray 4 media 
transport...

Diagnostic information2-77
7500-XXX
244.01 Sensor (tray 3 feed-out) on jam (tray 4 media feed)
StepCheckYe sNo
1Check the media condition.
Is the media in the tray crumpled or damaged?Replace the media.Go to step 2.
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...

2-78MFP Service Manual 7500-XXX
8Check the sensor (tray 3 feed-out) 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 Feed-out.
Open the 2TM/TTM left door assembly, and visually 
check it.
Does the display on the operator panel change every 
time the actuator on the above sensor operates?Go to step 10.Go to step 9.
9Check the sensor (tray 3 feed-out) for proper 
connection.
Is the above sensor connected properly?Replace...

Diagnostic information2-79
7500-XXX
244.02 Sensor (tray 2 feed-out) on jam (tray 4 media feed) 
11Perform 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 12.Problem solved.
12Perform 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.
StepCheckYe...

2-80MFP Service Manual 7500-XXX
6Check the sensor (tray 2 feed-out) for proper operation.
1. Enter the Diagnostics Menu.
2. Touch INPUT TRAY TESTS.
3. Touch Sensor Test.
4. Touch Tr a y  2 .  
5. Touch Feed-out.
Open the printer left lower door assembly, and visually 
check it.
Does the display on the operator panel change every 
time a white piece of paper is placed over the sensing 
area of the above sensor?Go to step 8.Go to step 7.
7Check the sensor (tray 2 feed-out) for proper 
connection.
Is the...

Diagnostic information2-81
7500-XXX
244.03 Sensor (registration) on jam (tray 4 media feed)
12Perform 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.
StepCheckYe sNo
1Check the media condition.
Is the media in the tray crumpled or damaged?Replace the media.Go to step 2.
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...

2-82MFP Service Manual 7500-XXX
244.04 Sensor (pre-feed) on jam (tray 4 media feed)
7Check the sensor (registration) for proper connection.
Is the above sensor connected properly?Replace the sensor 
(registration).
Go to “Sensor 
(registration) 
removal” on 
page 4-81.Replace the 
connection.
8Check the sensor (tray 4 feed-out) for proper operation.
1. Enter the Diagnostics Menu.
2. Touch INPUT TRAY TESTS.
3. Touch Sensor Test.
4. Touch Tr a y  4 .
5. Touch Feed-out.
Open the 2TM/TTM left door assembly,...