Lexmark X 850 Owners Manual

Diagnostic information2-193
7500-XXX
Switch (ADF left cover interlock) open
Toner cartridge empty 
Step Check Yes No
1 Check the actuator of the ADF left cover assembly.
Is the above actuator present and attached properly?Go to step 2. Replace the ADF 
left cover 
assembly.
Go to “ADF left 
cover assembly 
removal” on 
page 4-168.
2 Check the actuating lever of the switch (ADF left cover 
interlock).
Is the above actuating lever attached and aligned properly?Go to step 3. Adjust the 
actuating lever for...

2-194MFP Service Manual 7500-XXX
3 Check the toner cartridge guide assembly.
Remove the toner cartridge guide assembly.
Does the gear, located on the lower part of the toner 
cartridge guide assembly, rotate smoothly?Go to step 4. Replace toner 
cartridge guide 
assembly.
4 Check the pipe, located on the lower part of the toner 
cartridge for debris.
Is the pipe, located on the lower part of the toner cartridge 
guide assembly, clogged?Go to step 5. Clean the pipe.
5 Check the sensor (RFID toner...

Diagnostic information2-195
7500-XXX
Toner cartridge near empty
Toner cartridge failure 
Step Check Yes No
1 Does the toner cartridge contain toner? Go to step 2.  Replace the toner 
cartridge.
2 Check the toner cartridge for proper installation.
Remove the toner cartridge and reinstall it. 
Does it install properly?Problem solved Go to step 3. 
3 Check the gear rotation in the toner cartridge guide 
assembly.
Remove the toner cartridge guide assembly.
Does the gear, located at the lower part of the...

2-196MFP Service Manual 7500-XXX
Toner cartridge RFID failure 
Toner cartridge set failure
3 Checking the sensor (RFID toner cartridge) connection.
Is the sensor (RFID toner cartridge) properly connected? Replace the 
sensor (RFID 
toner 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 toner cartridge...

Diagnostic information2-197
7500-XXX
Tray 1 media size failure
3 Checking the toner cartridge guide assembly. Remove the 
top cover assembly. Is the toner cartridge guide assembly 
damaged?Replace the toner 
cartridge.
Go to “Toner 
cartridge guide 
assembly 
removal” on 
page 4-95.Go to step 4.
4 Checking the sensor (RFID toner cartridge). Is the above 
sensor attached and connected properly?Replace the 
sensor (RFID 
toner cartridge).Go to step 5.
5 Perform a print test. 
Does the error still...

2-198MFP Service Manual 7500-XXX
Tray 2 media size failure
Tray 1 media size mismatch in length
Step Check Yes No
1 Check the media.
Is media loaded, in media tray 2, properly?
Pull out media tray 2 to visually check it. Go to step 2. Load media 
properly.
2 Check the media.
Are the front media tray guide assembly, rear media tray 
guide, and media tray end guide of media tray 2 set 
correctly?
Pull out media tray 2 to visually check it. Go to step 3.  Set the guides 
properly.
3 Check the tray 2 switch...

Diagnostic information2-199
7500-XXX
5 Check the roll for tray 1.
Pull out tray 1 and check it.
Is the feed roll, separation roll, and pick roll free of excess 
wear and contamination?Go to step 6. Clean or replace 
the feed roll, 
separation roll, 
and pick roll.
6 Check the media position.
Open the printer left door assembly and visually check it.
Does the media touch the sensor (registration)?Remove the 
media.Go to step 7.
7 Check the roll. 
Open the printer left door assembly, and check it.
Is the...

2-200MFP Service Manual 7500-XXX
Tray 2 media size mismatch in length 
13 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.
Pull out tray 2 to visually check it. 
Is media loaded in tray 2 properly?Go to step 2.  Load media 
properly.
2 Check the media.
Pull out tray 2 to visually check it. 
Are the front media tray guide assembly, rear media tray...

Diagnostic information2-201
7500-XXX
7 Check the roll. 
Open the printer left door assembly and check it.
Is the transport roll assembly free of excess wear and 
contamination?Go to step 8. Clean or replace 
the transport roll 
assembly.
Go to “Transfer 
roll assembly 
removal” on 
page 4-73.
8 Check the roll. 
Open the printer left door assembly and check it.
Is the roll, in the registration roll assembly, free of excess 
wear and contamination?Go to step 9. Clean or replace 
the registration roll...

2-202MFP Service Manual 7500-XXX
Tray 3 media size failure
StepCheckYe sNo
1Check the media. 
Pull out tray 3, and visually check it.
Is the media loaded in tray 3 properly?Go to step 2.Load media 
properly.
2Check the media. 
Pull out tray 3, and visually check it.
Are the front media guide and rear media guide on tray 
3 set correctly?Go to step 3.Set the parts 
properly.
3Check the switch (TTM media size) for proper 
installation.
Pull out tray 3, and visually check it.
Is the switch (TTM media size)...