Duplex Unit Service Check; Paper Path Service Checks - Lexmark C925 Service Manual

Duplex unit service check

FRU
1 Feed roller belts
2 Duplex clutch
3 Duplex solenoid
4 Photo-interrupter assembly

Paper path service checks

Paper is being picked up and carried to the registration roller (Paper jams 200, 250,
24x).
FRU
1 Paper feed cassette
2 Paper feed unit rollers
Roller clutch
3
• Paper feed roller (MPF)
• Paper feed rolls MPF,
tray 1, 2, 3, 4, 5
• MPF pad
4
Gears
5 • Paper feed clutch
• MPF clutch
• MPF frame assembly
6 • Registration sensor
• MPF sensor
• Engine controller board
Action
Check for wear or damage to the feed roller belts. Replace as
necessary.
Check the clutch cable for proper connection to CN13 on the
engine board. If it is properly connected, replace the clutch. If this
doesn't fix the problem, replace the engine board.
Check for proper operation of the solenoid and linkage. Replace as
necessary.
Check the solenoid cable for proper connection to CN10 on the
engine board. If it is properly connected, replace the solenoid. If
this doesn't fix the problem, replace the engine board.
Ensure that the photo-interrupter actuators are operating correctly
and are in the proper position.
Action
If there are misfeeds and jams in the paper-feed unit, check to see
if the corners of the paper in the cassette are curled upward.
If the corners are curled, turn the entire stack of paper over. The
curling could be due to humidity conditions.
Are the rollers dirty or worn? Replace as needed.
If there is a failure to pick, and the feed rollers are clean, check the
roller clutch on the paperfeed unit. This check can be performed by
turning the paper feed roll in both directions.
If the shaft can be turned in both directions, replace the roller
clutch.
Be sure the paper feed rollers are free of dirt and not damaged.
Be sure the MPF pad is free of dirt and not damaged.
Replace parts as necessary.
Be sure the paper feed gears are not damaged.
Ensure the clutches are engaging properly.
Check connector CN 8 (Main tray), CN 28 (MPF) on the engine
controller board, and CN18 on the expansion feeder controller card
for proper connection.
Replace the non working clutch. If this doesn't fix the problem,
replace the engine board.
Check the following engine controller board connectors for proper
connection:
• Registration sensor—CN12
• MPF sensor—(CN14)
• If the connectors are properly connected, replace the sensors.
• If replacing the sensors does not fix the problem, replace the
engine control board.
5041-030
2-19
Diagnostic information
Previous
Next
Go Back