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Konica Minolta Bizhub 20p Service Manual: Paper Feeding Problems; No Feeding; Double Feeding

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3. PAPER FEEDING PROBLEMS

Problems related to paper feeding are end user recoverable if following the User Check
items. If the same problem occurs again, follow each procedure in the order of the number
described in the Step column in the tables below.
3.1
No Feeding
Step
Dirt on PE sensor
1
Edge actuator
2
catching on some
position
Roller holder
3
ASSY catching on
some position
Registration front
sensor failure
4
Separation pad or
roller holder ASSY
5
failure
Pressure plate
6
gear damage
Tray 1 solenoid
7
failure
Tray 1 solenoid
pathway of the
8
high-voltage
power supply PCB
broken
Main PCB failure
9
Main motor failure
10
3.2
Double Feeding
Step
Separation pad or
1
roller holder ASSY
failure
Cause
Is there paper powder in
the PE sensor?
Does the edge actuator
move smoothly?
Does the roller holder
ASSY move smoothly?
Is the problem solved
after replacing the
registration front sensor
PCB ASSY?
Is the surface of the
separation pad or the
pickup roller dirty or worn
out?
Is the pressure plate gear
damaged?
Does the tray 1 solenoid
work correctly?
Is the problem solved
after replacing the high-
voltage power supply
PCB ASSY?
Is the problem solved
after replacing the main
PCB ASSY?
Is the problem solved
after replacing the drive
sub ASSY?
Cause
Is the surface of the
separation pad worn out?
Check
Result
Yes
No
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
Check
Result
Yes
3-27
Remedy
Clean the PE sensor.
Re-assembly the edge
actuator.
Re-assembly the roller
holder ASSY.
Replace the registration
front sensor PCB ASSY.
1) Clean the surface of
the separation pad or
pickup roller.
2) Replace the separation
pad or pickup roller.
Replace the paper tray.
Replace the tray 1
solenoid.
Replace the high-voltage
power supply PCB ASSY.
Replace the main PCB
ASSY.
Replace the drive sub
ASSY.
Remedy
Replace the PF kit.
Confidential

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Troubleshooting

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