Konica-Minolta bizhub 224e

Machine is not energized at all (DCPU operation check)

Relevant electrical parts

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

Procedure

Step	Check item	Location	Result	Action
1	Is a power voltage supplied across CN001-1 and 2 on DCPU?	19-T	NO	Check the WIRING from the wall outlet to SW1 to CN001.
2	Are the fuses on DCPU conducting?		NO	Replace DCPU.
3	Is DC5 V being output from CN006-5 on DCPU?	22-R	NO	Replace DCPU.
4	Is DC24 V being output to CN007-3 on DCPU?	22-R	NO	• Check the WIRING from the wall MFPB to PRCB to DCPU. • Replace DCPU. • Replace MFPB. • Replace PRCB.
5	The LED on PRCB is blinking?		NO	Replace PRCB.
6	Is DC24 V being output to CN007-1 on DCPU?		NO	Replace DCPU.

Fusing heaters do not operate

Relevant electrical parts

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

Procedure

Step	Check item	Location	Result	Action
1	Is the power source voltage applied across CN008-5 on DCPU? During this time, the right door should be closed.	20-R	NO	Check wiring from power outlet to SW1 to CN008 to SW3.
2	Is the power source voltage applied across PRCB CN5-6, 9?	26-E	YES	Replace the fusing unit.
			NO	Replace DCPU. Replace PRCB.