Konica-Minolta bizhub 20

1. No Feeding

Step	Cause	Check	Result	Remedy
1	Dirt on PE sensor	Is there paper powder in the PE sensor?	Yes	Clean the PE sensnor.
2	Edge actuator catching on some position	Does the edge actuator move smoothly?	No	Re-assembly the edge actuator.
3	Roller holder ASSY catching on some position	Does the roller holder ASSY move smoothly?	Yes	Re-assembly the roller holder ASSY.
4	Separation pad or roller holder ASSY failure	Is the surface of the separation pad or the pickup roller dirty or worn out?	Yes	Clean the surface of the separation pad or pickup roller. Replace the separation pad or pickup roller.
5	Pressure plate gear damage	Is the pressure plate gear damaged?	Yes	Replace the paper tray.
6	Tray 1 solenoid failure	Does the tray 1 solenoid work correctly?	No	Replace the tray 1 solenoid.
7	Tray 1 solenoid pathway of the high-voltage power supply PCB broken or registration front sensor failure	Is the problem solved after replacing the high- voltage power supply PCB ASSY?	Yes	Replace the high-voltage power supply PCB ASSY.
8	Main PCB failure	Is the problem solved after replacing the main PCB ASSY?	Yes	Replace the main PCB ASSY.
9	Main motor failure	Is the problem solved after replacing the main motor ASSY?	Yes	Replace the main motor ASSY.

2. Double Feeding

Step	Cause	Check	Result	Remedy
1	Separation pad or roller holder ASSY failure	Is the surface of the separation pad worn out?	Yes	Replace the PF kit.

3. Paper jam in the paper tray and front cover

Step	Cause	Check	Result	Remedy
1	Dirt on edge sensor	Is there paper powder in the edge sensor?	Yes	Clean the edge sensor.
2	Registration front actuator/edge actuator catching on some position	Does the registration front actuator/edge actuator move smoothly?	No	Re-assemble the registration front actuator/ edge actuator.
3	Registration front sensor PCB (registration front actuator/edge actuator failure	Does the registration front sensor move smoothly? (Check it following the procedure described in "4.10 Sensor Operational Check (Function code 32)")	No	Replace the registration front sensor PCB ASSY.
4	Registration solenoid failure	Is the problem solved after replacing the registration solenoid?	Yes	Replace the registration solenoid.
5	Toner LED PCB failure	Is the problem solved after replacing the toner LED PCB ASSY?	Yes	Replace the toner LED PCB ASSY.
6	High-voltage power supply PCB failure	Is the problem solved after replacing the Highvoltage power supply PCB ASSY?	Yes	Replace the High-voltage power supply PCB ASSY.
7	Main PCB failure	Is the problem solved after replacing the Main PCB ASSY?	Yes	Replace the Main PCB ASSY.

4. Paper jam in the back cover and paper eject section

Step	Cause	Check	Result	Remedy
1	Foreign object around fuser unit	Is there a foreign object around the fuser unit?	Yes	Remove the foreign object.
2	Paper eject actuator failure	Does the paper eject actuator move smoothly? Is it damaged?	No	Replace the paper eject actuator.
3	Fuser cover ASSY loose	Is the fuser cover ASSY fitted correctly?	No	Fit the fuser cover ASSY correctly.
4	Outer chute ASSY loose	Is the outer chute ASSY fitted correctly?	No	Fit the outer chute ASSY fitted correctly.
5	Eject roller 1 malfunction	Is the eject roller 1 of the rear chute ASSY attached to the pinch roller properly?	No	Replace the rear chute ASSY.
6	Paper eject sensor failure	Is the problem solved after replacing the relay rear PCB?	Yes	Replace the relay rear PCB ASSY.
7	Main PCB failure	Is the problem solved after replacing the Main PCB ASSY?	Yes	Replace the Main PCB ASSY.