15. Power Supply Trouble; Machine Is Not Energized At All (Dcpu Operation Check); 15.2 Control Panel Indicators Do Not Light - Konica Minolta Magicolor 8650 Service Manual

Field Service Ver. 2.0 Nov. 2007

15. Power supply trouble

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

Main power switch (S1)
Front door switch/1 (S3)
Front door switch/2 (S4)
Printer control board (PRCB)
Step
Is a power voltage supplied across
1
CN1DCPU-1 and 2 on DCPU?
2 Are the fuses on DCPU conducting?
Is DC24 V being output from CN7DCPU-5
3
on DCPU?
Is DC5 V being input to CN5DCPU-1 on
4
DCPU?
Is DC5 V being input to CN31PRCB-3 on
5 the printer control board?
(LED on PRCB does not blink.)

15.2 Control panel indicators do not light.

Operation Board (OB)
Step
Is OB (PJ30MFPB) securely set on the
1
MFPB?
After the power switch is turned ON, the
blue and orange status indicator lights con-
tinue to be on while the control panel is not
2
being displayed.
Is JMPB (PJ17MFPB) securely set on the
MFPB?
Is a power voltage being applied across
3
CN1DCPU-1 and 2 on DCPU?
4 Is the fuse on DCPU conducting?
Confidential – for internal use only, do not distribute
Relevant parts
Check item
Relevant parts
Check item
15. Power supply trouble
DC power supply (DCPU)
WIRING
DIAGRAM Result
(Location)
Check the WIRING from
S-4 NO the wall outlet to S1 to
CN1DCPU.
— NO Change DCPU.
Q-6 NO Change DCPU.
Q-5 NO Change DCPU.
NO Change DCPU.
H-4
YES Change PRCB.
JMP board (JMPB)
DC power supply (DCPU)
WIRING
DIAGRAM Result
(Location)
T to U-12 NO Reconnect.
T to U-9 NO Reconnect.
Check the WIRING from
S-4 NO the wall outlet to S1 to
CN1DCPU.
— NO Change DCPU.
Action
Action
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