Lexmark MS312 Service Manual page 53

Actions
Step 5
Check the shutter on the imaging unit for signs of damage.
Note: The shutter opens to receive toner from the toner
cartridge.
Is the shutter on the imaging unit working properly?
Step 6
a
Check the status of the imaging unit.
1
From the home screen, select Status/supplies.
2
Select View Supplies.
b
Check the condition of the imaging unit.
Is the imaging unit near end of life and/or showing signs toner
leakage?
Step 7
Replace the imaging unit.
Does the problem remain?
Step 8
Replace the transfer roller. See
page 231.
Does the problem remain?
Step 9
Clean the printhead lens. See
page 290.
Note: This is applicable only to models installed with a galvo
LSU. To determine whether the LSU is galvo, check the serial
number of the printer. The sixth digit character assigned should
be in the 0–9 or B–N range (Example: 4514 20HH 007CR).
Does the problem remain?
Step 10
Replace the power supply. See
page 252.
Does the problem remain?
Step 11
Check the cartridge gearbox for damage.
Is the cartridge gearbox free from damage?
"Transfer roll removal" on
"Cleaning the printhead lenses" on
"Power supply removal" on
Diagnostics and troubleshooting
53
Yes No
Go to step 6. Go to step 7.
Go to step 7. Go to step 8.
Go to step 8. The problem is
solved.
Go to step 9. The problem is
solved.
Go to step 10. The problem is
solved.
Go to step 11. The problem is
solved.
Go to step 13. Go to step 12.
4514-330