Lexmark X 850 Owners Manual

							Diagnostic information2-53
7500-XXX
5Check the drive power transmission. 
Do the exit 2 media exit roll assembly and the other 
gears rotate smoothly?Go to step 6.Replace damaged 
components.
Go to “Exit 2 unit 
assembly removal” 
on page 4-315.
6Check the exit 2 drive motor for proper operation. 
1. Enter the Diagnostics Menu.
2. Touch MOTOR TESTS.
3. Touch Printer Motor Test.
4. Touch Exit2 drive mtr.
5. Touch Forward or reverse.
Does the above motor rotate normally?Go to step 8.Go to step 7.
7Check the exit 2 drive motor for proper connection.
Is the above motor connected properly?Replace the exit 2 
unit assembly.
Go to “Exit 2 unit 
assembly removal” 
on page 4-315.Replace the 
connection.
8Check the connection between the exit interface card 
assembly and the printer engine card assembly. 
Are connectors P431 and P421 connected properly?Go to step 9.Replace the 
connection.
9Check the sensor (duplex wait) for proper operation.
1. Enter the Diagnostics Menu.
2. Touch DUPLEX TESTS.
3. Touch Sensor Test.
4. Touch Duplex wait.
Open the duplex left door assembly.
Does the display on the operator panel change every 
time the sensing area of the above sensor is blocked by 
the duplex wait actuator?Go to step 11. Go to step 10.
10Check the sensor (duplex wait) for proper connection.
Is the above sensor connected properly?Replace the sensor 
(duplex wait).
Go to “Duplex 
sensor (duplex 
wait) removal” on 
page 4-307.Replace the 
connection.
11Perform a 2 sided print test.
Does the error still occur?Replace the duplex 
controller card 
assembly. 
Go to “Duplex 
controller card 
assembly removal” 
on page 4-304.
Go to step 12.Problem solved.
12Perform a 2 sided 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 
						

							2-54MFP Service Manual 7500-XXX
230.01 Sensor (duplex wait) static jam
231.00 Sensor (registration) on jam (duplex paper feed)
StepCheckYe sNo
1Check the paper position.
Open the duplex left door assembly, and visually check 
it. 
Does the paper touch the duplex wait actuator?Remove the paper.Go to step 2.
2Check the sensor (duplex wait) for proper operation.
1. Enter the Diagnostics Menu.
2. Touch DUPLEX TESTS.
3. Touch Sensor Test.
4. Touch Duplex wait.
Open the duplex left door assembly.
Does the display on the operator panel change every 
time the sensing area of the above sensor is blocked by 
the duplex wait actuator?Go to step 4.Go to step 3.
3Check the sensor (duplex wait) for proper connection.
Is the above sensor connected properly?Replace the sensor 
(duplex wait).
Go to “Duplex 
sensor (duplex 
wait) removal” on 
page 4-307.Replace the 
connection.
4Perform a 2 sided print test.
Does the error still occur?Replace the duplex 
controller card 
assembly. 
Go to “Duplex 
controller card 
assembly removal” 
on page 4-304.
Go to step 5.Problem solved.
5Perform a 2 sided 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 paper position.
Open the printer left door assembly and visually check 
it. 
Does the paper touch the sensor (registration)?Remove the paper.Go to step 2.
2Check the Duplex for proper installation.
Remove duplex unit assembly and reinstall it.
Perform a two sided print test. 
Does the error still occur?Go to step 3.Problem solved. 
						

							Diagnostic information2-55
7500-XXX
3Check the roll. 
Open the duplex left door assembly.
Is the duplex media transport roll assembly free of 
excess wear and contamination?Go to step 4.Clean or replace the 
duplex media 
transport roll 
assembly.
Go to “Duplex 
media transport 
rolls removal” on 
page 4-313.
4Check the drive power transmission. 
Open the duplex left door assembly. 
Do the duplex media transport roll assembly and the 
other gears rotate smoothly?Go to step 5.Replace damaged 
components.
Go to “Duplex 
media transport 
rolls removal” on 
page 4-313.
5Check the roll. 
Open the duplex left door assembly.
Is the duplex media transport center roll assembly free 
of excess wear and contamination?Go to step 6.Clean or replace the 
duplex media 
transport center roll 
assembly.
Go to “Duplex 
media center 
transport roll 
removal” on 
page 4-314.
6Check the drive power transmission.
Open the duplex left door assembly.
Do the duplex media transport center roll assembly and 
the other gears rotate smoothly?Go to step 7.Replace damaged 
components.
Go to “Duplex 
media center 
transport roll 
removal” on 
page 4-314.
7Check the duplex drive motor for proper operation.
1. Enter the Diagnostics Menu.
2. Touch MOTOR TESTS.
3. Touch Printer Motor Test.
4. Touch Duplex drv mtr.
Open the duplex left cover assembly.
Does the above motor rotate properly?Go to step 9.Go to step 8.
8Check the duplex drive motor for proper connection.
Is the above motor connected properly?Go to step 9.Replace the 
connection.
9Check the duplex controller card assembly and printer 
engine card assembly for proper connection.
Are the connections on the duplex controller card 
assembly and the connector P417 on the printer engine 
card assembly connected?Go to step 10.Replace the 
connection.
10Perform a 2 sided print test.
Does the error still occur?Replace the duplex 
controller card 
assembly. 
Go to “Duplex 
controller card 
assembly removal” 
on page 4-304.
Go to step 14Problem solved.
StepCheckYe sNo 
						

							2-56MFP Service Manual 7500-XXX
231.01 Sensor (registration) on jam (duplex paper feed)
14Perform a 2 sided 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 paper position.
Open the printer left door assembly, and visually check 
it. 
Does the paper touch the sensor (registration)?Remove the paper.Go to step 2.
2Check the paper position.
Open the duplex left door assembly and visually check 
it. 
Does the paper touch the duplex wait actuator?Remove the paper.Go to step 3.
3Check the duplex unit for proper installation.
Remove the duplex unit assembly and reinstall it.
Perform a two sided print test. 
Does the error still occur?Go to step 4.Problem solved.
4Check the roll. 
Open the duplex left door assembly.
Is the roll of the duplex media transport roll assembly 
free of excess wear and contamination?Go to step 5.Clean or replace the 
duplex media 
transport roll 
assembly.
Go to “Duplex 
media transport 
rolls removal” on 
page 4-313.
5Check the drive power transmission. 
Open the duplex left door assembly.
Do the duplex media transport roll assembly and the 
other gears rotate smoothly?Go to step 6.Replace damaged 
components.
Go to “Duplex 
media transport 
rolls removal” on 
page 4-313.
6Check the roll.
Open the duplex left door assembly.
Is the roll of the duplex media center transport roll 
assembly free of excess wear and contamination?Go to step 7.Clean or replace the 
duplex media center 
transport roll 
assembly.
Go to “Duplex 
media center 
transport roll 
removal” on 
page 4-314.
StepCheckYe sNo 
						

							Diagnostic information2-57
7500-XXX
7Check the drive power transmission. 
Open the duplex left door assembly.
Do the duplex media center transport roll assembly and 
the other gears rotate smoothly?Go to step 8.Replace damaged 
components.
Go to “Duplex 
media center 
transport roll 
removal” on 
page 4-314.
8Check the sensor (duplex wait) for proper operation.
1. Enter the Diagnostics Menu.
2. Touch DUPLEX TESTS.
3. Touch Sensor Test.
4. Touch Duplex wait.
Open the duplex left door assembly.
Does the display on the operator panel change every 
time the sensing area of the above sensor is blocked by 
the duplex wait actuator?Go to step 10.Go to step 9.
9Check the sensor (duplex wait) for proper connection.
Is the above sensor connected properly?Go to step 10.Replace the 
connection.
10Check the duplex drive motor for proper operation.
1. Enter the Diagnostics Menu.
2. Touch MOTOR TESTS.
3. Touch Printer Motor Test.
4. Touch Duplex drv mtr.
Open the duplex left cover assembly.
Does the above motor rotate properly?Go to step 12.Go to step 11.
11Check the duplex drive motor assembly for proper 
connection.
Is the above motor connected properly?Replace the duplex 
drive motor.
Go to “Duplex drive 
motor assembly 
removal” on 
page 4-301.Replace the 
connection.
12Check the duplex controller card assembly and printer 
engine card assembly for proper connection.
Are the connections on the duplex controller card 
assembly and the connector P417 on the printer engine 
card assembly connected?Go to step 13.Replace the 
connection.
13Perform a 2 sided print test.
Does the error still occur?Replace the duplex 
controller card 
assembly.
Go to “Duplex 
controller card 
assembly removal” 
on page 4-304.
Go to step 14.Problem solved.
14Perform a 2 sided 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 
						

							2-58MFP Service Manual 7500-XXX
241.00 Sensor (pre-feed) on jam (tray 1 feed)
Step Check Yes No
1Check the media condition. 
Is the media in the tray crumpled or damaged? Replace the 
damaged media 
with new.Go to step 2.
2
Check the media size setup. 
Does the media size, in use, match the size set for tray 1?Go to step 3. Replace the 
media, or change 
the media size 
setup. 
3
Check the rolls for tray 1.
Remove tray 1, check it over. 
Are the feed roll, separation roll, and pick roll free of excess 
wear and contamination?Go to step 4. Clean or replace 
the feed roll, 
separating roll, or 
pick roll.
Go to “Feed roll 
removal” on 
page 4-45, 
“Separation roll 
removal” on 
page 4-49, and 
“Pick roll 
removal” on 
page 4-51.
4
Check the media position.
Open the printer left door assembly and visually check it.
Does the media touch the sensor (pre-feed) in tray 1 media 
feed unit assembly?Remove the 
media.Go to step 5
5
Check the sensor (pre-feed) for proper operation in tray 1.
1. Enter the Diagnostics Menu.
2. Touch INPUT TRAY TESTS.
3. Touch Sensor test.
4. Touch Tr a y  1 .
5. Touch Pre-feed.
Remove the media tray assembly and check it.
Does the display, on the operator panel, change every time 
a white piece of paper is placed over the sensing area? Ensure the media 
feed unit front 
guide is installed 
properly. 
Go to step 7. Go to step 6.
6
Check the sensor (pre-feed) connection.
Is the sensor (pre-feed) properly connected?Replace the 
sensor (pre-feed).Replace the 
connection. 
7
Check the media feed lift motor in tray 1 for proper 
operation. 
1. Enter the Diagnostics Menu.
2. Touch MOTOR TESTS.
3. Touch Printer motor tests.
4. Touch Tray 1 feed mtr.
Pull out tray 1, and check it.
Does the media feed lift motor rotate normally?Go to step 10. Skip to step 9. 
8 Check the media feed lift motor connection.
Is the media feed lift motor properly connected? Go to step 9. Replace the 
connection.  
						

							Diagnostic information2-59
7500-XXX
241.01 Sensor (registration) on jam (tray 1 feed) 
9Check the media feed lift motor for proper operation of 
tray 1. 
Replace the media feed lift motor for tray 1 with one from 
tray 2. 
1. Enter the Diagnostics Menu.
2. Touch MOTOR TESTS.
3. Touch Printer Motor Test.
4. Touch Tray 1 feed mtr.
Does the motor rotate normally?Re-install the 
media feed lift 
motor for tray 2 as 
it previously was 
and replace the 
tray 1 motor with a 
new one.
Go to “Media feed 
lift motor 
removal” on 
page 4-33.Go to step 10.
10
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 media condition. 
Is the media in the tray crumpled or damaged?Replace with new 
media; ensure it is 
dry.Go to step 2.
2 Check the media size setup. 
Does the size of media in use match the size set for tray 1?Go to step 3. Replace the media 
or change the 
media size setup.
3 Check the rolls for tray 1. 
Remove and check tray 1.
Are the feed roll, separation roll, and pick roll free of excess 
wear and contamination?Go to step 4. Clean or replace 
the feed roll, 
separation roll, 
and pick roll.
Go to “Feed roll 
removal” on 
page 4-45, 
“Separation roll 
removal” on 
page 4-49, and 
“Pick roll 
removal” on 
page 4-51.
4 Check the media position. 
Open the printer left door assembly, and visually check it. 
Does the media touch the sensor (registration) or the 
sensor (pre-feed) in tray 1 media feed unit assembly?Remove the 
media.Go to step 5. Step Check Yes No 
						

							2-60MFP Service Manual 7500-XXX
242.00 Sensor (pre-feed) on jam (tray 2 feed) 
5 Check the sensor (registration) for proper operation.
1. Enter the Diagnostics Menu.
2. Touch BASE SENSOR TEST.
3. Touch Media Path.
4. Touch Registration.
Open the printer left door assembly. 
Does the display on the operator panel change every time 
the sensor actuator operates?Go to step 7. Go to step 6. 
6 Check the sensor (registration) connection.
Is the sensor (registration) properly connected? Replace the 
sensor 
(registration).
Go to “Sensor 
(registration) 
removal” on 
page 4-81.Replace the 
connection. 
7 Check the sensor (pre-feed) for proper operation in tray 1. 
1. Enter the Diagnostics Menu.
2. Touch INPUT TRAY TESTS.
3. Touch Sensor test.
4. Touch Tr a y  1 .
5. Touch Pre-feed.
Remove the media tray assembly, and check it.
Does the display on the operator panel change every time a 
white piece of paper is placed over the sensing area?Ensure the media 
feed unit front 
guide is installed 
properly.
Go to step 9.Replace the 
sensor (pre-feed). 
Go to “Sensor 
(pre-feed) 
removal” on 
page 4-41.
8 Check the sensor (pre-feed) connection.
Is the sensor (pre-feed) properly connected?Replace the 
sensor (pre-feed).
Go to “Sensor 
(pre-feed) 
removal” on 
page 4-41.Replace the 
connection. 
9 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 media condition. 
Is the media in the tray crumpled or damaged?Replace the media 
with new media; 
ensure it is dry.Go to step 2.
2 Check the media size setup.
Does the media size in use match the size set for tray 2?Go to step 3. Replace the 
media, or change 
the media size 
setup. Step Check Yes No 
						

							Diagnostic information2-61
7500-XXX
3 Check the rolls for tray 2. 
Remove tray 2 and check it. 
Are the feed roll, separation roll, and pick roll free of excess 
wear and contamination?Go to step 4. Clean or replace 
the feed roll, 
separation roll, 
and pick roll.
Go to “Feed roll 
removal” on 
page 4-45, 
“Separation roll 
removal” on 
page 4-49, and 
“Pick roll 
removal” on 
page 4-51.
4 Check the media position. 
Open the printer left lower door assembly, and visually 
check it. 
Does the media touch the sensor (pre-feed) in the tray 2 
media feed unit?Remove the 
media.Go to step 5.
5 Check the sensor (pre-feed) in tray 2 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 Pre-feed.
Remove the media tray assembly, and check it.
Does the display on the operator panel change every time a 
white piece of paper is placed over the sensing area?Ensure the media 
feed unit front 
guide is installed 
properly. 
Go to step 7.Go to step 6.
6 Check the sensor (pre-feed) connection.
Is the sensor (pre-feed) properly connected?Replace the 
sensor (pre-feed).
Go to “Sensor 
(pre-feed) 
removal” on 
page 4-41.Replace the 
connection. 
Go to “Sensor 
(pre-feed) 
removal” on 
page 4-41.
7 Check the media feed lift motor in tray 2 for proper 
operation. 
1. Enter the Diagnostics Menu.
2. Touch MOTOR TESTS.
3. Touch Printer Motor Test.
4. Touch Tray 2 feed mtr.
Pull out tray 2, and check it. 
Does the media feed lift motor rotate normally.Go to step 10. Go to step 8.
8 Check the media feed lift motor connection.
Is the media feed lift motor properly connected?Go to step 9. Replace the 
connection. 
Go to “Sensor 
(pre-feed) 
removal” on 
page 4-41 Step Check Yes No 
						

							2-62MFP Service Manual 7500-XXX
242.01 Sensor (tray 2 feed-out) on jam (tray 2 feed)
9 Check the media feed lift motor in tray 2 for proper 
operation.
Replace the media feed lift motor for tray 2 with the one 
from tray 1. 
1. Enter the Diagnostics Menu.
2. Touch MOTOR TESTS.
3. Touch Printer Motor Test.
4. Touch Tray 2 feed mtr.
Does the media feed lift motor rotate normally?Install the media 
feed lift motor for 
tray 1 as it 
previously was 
and replace the 
motor for tray 2 
with a new motor.
Go to “Media feed 
lift motor 
removal” on 
page 4-33.Go to step 10.
10 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 media condition. 
Is the media in the tray crumpled or damaged?Replace the media 
with new media; 
ensure it is dry.Go to step 2.
2 Check the media size setup.
Does the media size, in use, match the size set for tray 2?Go to step 2. Replace the 
media, or change 
the media size 
setup.
3 Check the rolls for tray 2.
Pull out tray 2, and check it. 
Open the printer left lower door assembly, and visually 
check it. 
Are the feed roll, separation roll, and pick roll free of excess 
wear and contamination?Go to step 4. Clean or replace 
the feed roll, 
separation roll, 
and pick roll.
Go to “Feed roll 
removal” on 
page 4-45, 
“Separation roll 
removal” on 
page 4-49, and 
“Pick roll 
removal” on 
page 4-51.
4 Check the media position. 
Does the media touch the sensor (tray 2 feed-out) or the 
tray 2 media feed unit?Remove the 
media.Go to step 5. Step Check Yes No