Konica Minolta magicolor 7450, Service Manual

Page: 248 / 346

Field Service Ver. 1.0 May 2006 15. Power supply trouble
211
magicolor 7450
T
roubleshooting
15.2 Control panel indicators do not light.
15.3 Fusing Heaters do not Operate
Relevant Electrical Parts
Controller Board (PWB-P)
Control Panel (PWB-OP) DC Power Supply (PU1)
Step Check Item
WIRING
DIAGRAM
(Location)
Result Action
1
Is a power voltage being applied across
CN1PU1-1 and 2 on PU1 ?
S to T-2 NO
Check the WIRING from
the wall outlet to S1 to
CN1PU1.
2 Is the fuse on PU1 conducting ? — NO Change PU1.
3
Is DC3.3 V being output from CN6PU1-1 on
PU1?
R-4 NO Change PU1.
4
Is “Low” being output from CN7PU1-2 on
PU1?
R-5 NO
Check the WIRING from
the PWB-P to PWB-M to
CN1PU1.
5
Is DC5 V being output from CN6PU1-2 on
PU1?
R-4 NO Change PU1.
6
Is J22P on PWB-P securely connected ?
T-10 NO
Reconnect.
Check the WIRING from
the PWB-P to PWB-M.
7
Is CN20P on PWB-OP securely connected
?
V to W-10
NO Reconnect.
YES
Change PWB-OP.
Change PWB-P.
Relevant Electrical Parts
Primary Interlock Switch (S2)
Fusing Unit DC Power Supply (PU1)
Step Check Item
WIRING
DIAGRAM
(Location)
Result Action
1
Is the power source voltage applied across
CN2PU1-1 to 2 on PU1 ?
During this time, the Right Door should be
closed.
S to T-2 NO
Check wiring from power
outlet to S2 to CN2PU1.
2
Is the power source voltage applied across
CN30-1 and 3, or across 2 and 3 ?
U-6
YES Fusing Unit
NO Change PU1.