15. Power Supply Trouble; Machine Is Not Energized At All (Pu1 Operation Check) - Konica Minolta magicolor 7450 Service Manual

15. Power supply trouble

15. Power supply trouble

15.1 Machine is not Energized at All (PU1 Operation Check)

Main Power Switch (S1)
Mechanical Control Board (PWB-M)
Step
Is a power voltage supplied across
1 CN1PU1-1 and 2 on PU1?
2 Are the fuses on PU1 conducting ?
Is DC3.3 V being output from CN6PU1-1 on
3
PU1?
Is "Low" being output from CN7PU1-2 on
4 PU1?
Is DC24 V being output from CN5PU1-2 on
5
PU1?
6 Is DC5 V being input to CN5PU1-3 on PU1?
Is DC5 V being input to CNPOW-2 on the
5 Control Board? (LED on PWB-M does not
blink.)
210
Relevant Electrical Parts
Check Item
Field Service Ver. 1.0 May 2006
DC Power Supply (PU1)
WIRING
DIAGRAM Result
(Location)
Check the WIRING from
S to T-2 NO the wall outlet to S1
CN1PU1.
— NO Change PU1.
R-4 NO Change PU1.
Check the WIRING from
R-5 NO the PWB-P to PWB-M to
CN1PU1.
R-6 NO Change PU1.
R-4 NO Change PU1.
NO Change PU1.
I-6
YES Change PWB-M
Action