Konica-Minolta bizhub C3350

Machine is not energized at all (DCPU operation check)

Relevant electrical parts

• Power switch (SW1)
• Printer control board (PRCB)
• DC power supply (DCPS)

Procedure

Step	Check item	Location	Result	Action
1	Is a power voltage supplied across CN1 on DCPS?	2-G	NO	Check the wiring from the wall outlet to inlet to SW1 to DCPS CN1.
2	Are DC5.1 V being output from CN11 ON MFPB?	6-F	NO	• Check the wiring from the DCPS CN5 to MFPB CN11. • Replace DCPS.
3	Is DC24 V being output from CN1 on PRCB?	5-G	NO	Check the wiring from the DCPS CN4 to PRCB CN1.
4	Is DC24 V being output from CN502 on MFPB?	6-F	NO	Replace MFPB.
5	Check the wiring from the MFPB CN16C to PRCB CN4.		NO	• Reconnect. • Replace the flat cable.
6	Check the wiring from the PRCB CN1 to DCPS CN4.		YES	Reconnect.
			NO	Replace PRCB.

Operation panel indicators do not light

Relevant electrical parts

• MFP board (MFPB)
• Control panel
• DC power supply (DCPS)

Procedure

Step	Check item	Location	Result	Action
1	Is a power voltage supplied across CN1 on DCPS?	2-G	NO	Check the wiring from the wall outlet to inlet to SW1 to DCPS CN1.
2	Are the fuses on DCPS conducting?		NO	Replace DCPS.
3	Is CN200 on MFPB properly connected?	3-B	NO	Reconnect.
4	Is CN11, CN502 on MFPB properly connected?	6-F	NO	Reconnect.
			YES	• Replace MFPB. • Replace the scanner unit. • Replace the operation panel.

Fusing heaters do not operate

Relevant electrical parts

• Main power switch (SW1)
• Right door switch (SW3)
• Fusing unit
• DC power supply (DCPS)
• Printer control board (PRCB)

Procedure

Step	Check item	Location	Result	Action
1	Is the power source voltage applied across CN1 on DCPS?	2-G	NO	Check the wiring from the wall outlet to inlet to SW1 to DCPS CN1.
2	Is the power source voltage applied across CN2 on DCPS?	2-H	YES	Replace fusing unit.
			NO	• Check the wiring from the DCPS CN3 to PRCB CN2. • Replace DCPS. • Replace PRCB.

Operation panel (touch panel) do not respond

Relevant electrical parts

• Operation panel (OP)
• SSD board (SSDB)

Procedure

1. To perform calibration of the operation panel.
2. Replace SSDB.
3. To perform calibration of the operation panel again.
4. If the above actions do not solve the problem, replace the operation panel.

Output tray full indication does not disappear bizhub C3850FS

Relevant electrical parts

• Output tray paper holding motor (FSM6)
• Output tray full sensor (FSPS6)
• FS control board (FSCB)

Procedure

Step	Action	Control signal	Location
1	Check the connector between FSM6-relay CN39-FRCB CN9 for proper connection and correct as necessary.
2	Check the connector of FSM6 for proper drive coupling, and correct as necessary.
3	Check the connector between FSPS6-relay CN39- FRCB CN9 for proper connection and correct as necessary.
4	FSPS6I/O check, sensor check	FSCB CN9-8	2-S
5	FSM6 operation check	FSCB CN9-12 to13	2-S
6	Replace FSM6
7	FSCB PTC1 conduction check
8	Replace FSCB