Paper Carrying Service Check - Lexmark C920 Service Manual

5056-XXX

Paper carrying service check

Paper has not exited or is stopped in the high-capacity feeder (area F, 249).
FRU
1 • Paper feed roller
• Transfer roller
2 • Paper feed clutch
• Paper feed motor
• Sensors
3 • HCPF control card
• HCPF power supply
Paper is being picked up and carried to the registration roller (areas C, E, 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
• Carrying roller
tray 1, 2, 3, 4, 5
• Fanning pad (MPF)
4 Gears
5 • Paper feed clutch
• MPF clutch
• MPF frame assembly
6 • Registration sensor
• MPF sensor
• Printer controller board
• CK1 daughter card
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Service Manual
Action
Be sure the paper feed roller transfer roller, reverse roller, and call
roller are free of dirt and are not damaged. Clean or replace parts
as necessary.
Set up and run a test in Maintenance Mode, and go to
capacity feeder (HCF) service check" on page
Ensure all motors, clutches, and sensors operate correctly.
Set up and run a test in Maintenance Mode, and go to
capacity feeder (HCF) service check" on page
If no LEDs light, check the power source. Replace the HCF control
card. Replace the HCF power supply.
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 fanning 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 CN17 (tray 1), CN8 (MPF) on the CK1 daughter
card, and CN18 on the expansion feeder controller card for
continuity.
If possible, check for fluctuation between 0 and +5V on the CK1
daughter card board between the following pins when actuating the
sensor:
• Registration sensor–CN6 (pins 1 and 2)
• MPF sensor–(CN6 pins 4 and 5)
• If the voltage fluctuates as stated previously, replace the printer
controller board.
• If the voltage does not fluctuate, replace the sensor.
"High-
2-53.
"High-
2-53.