15.2 Control Panel Indicators Do Not Light; 15.3 Fusing Heaters Do Not Operate - Konica Minolta magicolor 7450 Service Manual

Field Service Ver. 1.0 May 2006

15.2 Control panel indicators do not light.

Controller Board (PWB-P)
Control Panel (PWB-OP)
Step
Is a power voltage being applied across
1 CN1PU1-1 and 2 on PU1 ?
2 Is the fuse 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 DC5 V being output from CN6PU1-2 on
5
PU1?
Is J22P on PWB-P securely connected ?
6
Is CN20P on PWB-OP securely connected
?
7

15.3 Fusing Heaters do not Operate

Primary Interlock Switch (S2)
Fusing Unit
Step
Is the power source voltage applied across
CN2PU1-1 to 2 on PU1 ?
1
During this time, the Right Door should be
closed.
Is the power source voltage applied across
2
CN30-1 and 3, or across 2 and 3 ?
Relevant Electrical Parts
Check Item
Relevant Electrical Parts
Check Item
15. Power supply trouble
DC Power Supply (PU1)
WIRING
DIAGRAM Result
(Location)
Check the WIRING from
S to T-2 NO the wall outlet to S1 to
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-4 NO Change PU1.
Reconnect.
T-10 NO Check the WIRING from
the PWB-P to PWB-M.
NO Reconnect.
V to W-10
Change PWB-OP.
YES
Change PWB-P.
DC Power Supply (PU1)
WIRING
DIAGRAM Result
(Location)
Check wiring from power
outlet to S2 to CN2PU1.
S to T-2 NO
YES Fusing Unit
U-6
NO Change PU1.
Action
Action
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