Konica-Minolta bizhub C658

Machine is not energized at all (DCPU operation check)

Relevant electrical parts

• Main power switch (SW1)
• MFP board (MFPB)
• DC power supply (DCPU)

Procedure

Step	Check item	Location	Result	Action
1	Is a power voltage supplied across CN1-1 and 2 on DCPU?	15-S	NO	Check the WIRING from the wall outlet to SW1 to CN1.
2	Are the fuses on DCPU conducting?		NO	Replace DCPU
3	Is DC5 V being output from CN6-5 on DCPU?	17-S	NO	Replace DCPU
4	Is DC24 V being output to CN7-3 on DCPU?	18-S	NO	• Check the WIRING from the wall MFPB to DCPU. • Replace DCPU • Replace MFPB
5	The LED on MFPB is blinking?		NO	Replace MFPB
6	Is DC24 V being output to CN7-1 on DCPU?	18-S	NO	Replace DCPU

Fusing heaters do not operate

Relevant electrical parts

• Front door switch (SW2)
• Right door switch (SW3)
• Fusing unit
• DC power supply (DCPS)
• MFP board (MFPB)

Procedure

Step	Check item	Location	Result	Action
1	Is a power voltage supplied across CN8-5 on DCPU? During this time, the right door should be closed.	15 to 16-Q	NO	Check wiring from power outlet to SW1 to CN8 to SW3.
2	Is the power source voltage applied across MFPB CN13E-6, 9?	23 to 24-C	YES	Replace the fusing unit
			NO	Replace DCPU. Replace MFPB.