Power Supply Trouble; Machine Is Not Energized At All (Dcpu Operation Check; Fusing Heaters Do Not Operate - Konica Minolta BIZHUB C3100P Service Manual

4. POWER SUPPLY TROUBLE

4.1 Machine is not energized at all (DCPU operation check)

Relevant parts
• Power switch (SW1)
• Printer control board (PRCB)
Check item
Step
Is a power voltage supplied across CN1 on
1
DCPU?
Is DC5 V being output from CN24 on MFPB?
2
Is DC24 V being output from CN1 on PRCB?
3
Check the wiring from the CN16MFPB to
4
CN5PRCB.
Check the wiring from the CN1PRCB to
5
CN4DCPU.
• Link to the wiring diagram 2/2
4.2 Control panel indicators do not light
Relevant parts
• MFP board (MFPB)
• Control panel
Check item
Step
Is a power voltage supplied across CN1 on
1
DCPU?
2 Are the fuses on DCPU conducting?
3 Is CN17 on MFPB properly connected?
• Link to the wiring diagram 1/2
• Link to the wiring diagram 2/2

4.3 Fusing heaters do not operate

Relevant parts
• Main power switch (SW1)
• Right door switch (SW3)
• Fusing unit
Check item
Step
Is the power source voltage applied across CN1
1
on DCPU?
Is the power source voltage applied across CN2
2
on DCPU?
• Link to the wiring diagram 1/2
• Link to the wiring diagram 2/2
K TROUBLESHOOTING > 4. POWER SUPPLY TROUBLE
• DC power supply (DCPU)
WIRING DIAGRAM
Result
(Location)
11-K NO
10-F NO
12-I NO
- YES
YES
-
NO
• DC power supply (DCPU)
WIRING DIAGRAM
Result
(Location)
11-K NO
- NO
NO
10-F to G
YES
• DC power supply (DCPU)
• Printer control board (PRCB)
WIRING DIAGRAM
Result
(Location)
11-K NO
YES
11-I
NO
K-24
Action
• Check the wiring from the wall outlet to inlet to
SW1 to CN1DCPU.
• Check the wiring from the CN4DCPU to
CN24MFPB.
• Check the wiring from the CN4DCPU to
CN1PRCB.
• Reconnect.
• Change flat cable.
• Reconnect.
• Change PRCB.
Action
• Check the wiring from the wall outlet to inlet to
SW1 to CN1DCPU.
• Change DCPU.
• Reconnect.
• Change MFPB.
• Change operation panel.
Action
• Check the wiring from the wall outlet to inlet to
SW1 to CN1DCPU.
• Change fusing unit.
• Check the wiring from the CN2DCPU to
CN9PRCB.
• Change DCPU.
• Change PRCB.