Konica-Minolta bizhub 4052

Machine is not energized at all (PU operation check)

Relevant electrical parts

• MFP board (MFPB)
• Power supply unit (PU)

Procedure

Step	Action	Yes	No
1	Is the machine plugged in?	Go to step 3.	Go to step 2.
2	Plug the machine in. Did this fix the problem?	The problem is solved.	Go to step 3.
3	Check the power cord for continuity. Is there continuity?	Go to step 4.	Replace the power cord.
4	Check the AC line voltage to the machine. The voltage should be within the following limits: for 110 V machines - 100 to 127 V AC for 220 V machines - 200 to 240 V AC Is the voltage within the limits?	Go to step 5.	Connect the different outlet.
5	Check the voltages of JPS1 on the MFP board. +5 V at pins 17 and 19 +24 V at pins 11, 13, and 15 Are the voltages correct?	Replace MFPB.	Replace PU.

Operation panel indicators do not light

Relevant electrical parts

• Operation panel (OP)
• MFP board (MFPB)

Procedure

Step	Action	Yes	No
1	Check the connections on OP and MFPB for proper connections. Are they properly connected?	Go to step 3.	Go to step 2.
2	Properly connect the connectors. Did this fix the problem?	The problem is solved.	Go to step 3.
3	Replace OP. Does the error remain?	Replace MFPB.	The problem is solved.

Operation panel (touch panel) do not respond

Relevant electrical parts

• Operation panel (OP)

Procedure

Step	Check item
1	To perform calibration of the operation panel.
2	If the above actions do not solve the problem, replace the operation panel.