111.xx LSU service check
Action Yes No
Step 1
Check the LSU cables JVIDEO1 and JGLV1 for proper connection.
Are they properly connected?
Go to step 2. Reseat the cables.
Step 2
Inspect the LSU cables and connectors.
Are they free of damage?
Replace the controller
board. See “Controller
board removals” on
page 184.
Replace the LSU. See
“Laser scanning unit
(LSU) removal” on
page 246.
Fuser service check
Action Yes No
Step 1
• Check the fuser cables JTHERM1 and JEXIT for proper connection to
the controller board.
• Check the cable PCN5 for proper connection to the power supply.
Are they properly connected?
Go to step 2. Reseat the cables.
Step 2
Are the cables JTHERM1, JEXIT and PCN5 free of damage?
Go to step 3. Replace the fuser. See
“Fuser removal” on
page 244.
Step 3
a Turn off the printer.
b Remove the rear door and cover.
c Disconnect the fuser cable connected to PCN5 of the power supply.
d Check for approximate correct resistance on the fuser cable:
• 220V fuser—43 ohms
• 110V fuser—10 ohms
• 100V fuser—8 ohms
Is the resistance equal to any of the above values?
Perform an LVPS
service check. See
“LVPS service check”
on page 92.
Replace the fuser. See
“Fuser removal” on
page 244.
Step 4
Check the fuser rollers, belts and gears for damage and debris.
Are they free of damage and debris?
Perform a cooling fan
service check and LVPS
service check. See
“171.xx Cooling fan
service check” on
page 95 and “LVPS
service check” on
page 92.
Replace the fuser. See
“Fuser removal” on
page 244.
4514-630, -635, -636
Diagnostic information
91
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