Konica Minolta Magicolor 5440 DL - Manual (Page 214)

Main Unit Field Service Power Supply Troubles
4-27
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3. Power Supply Troubles
3.1 Machine is Not Energized at All (LV Operation Check)
3.2 Control panel indicators do not Light
Relevant Electrical Parts
Power Switch
Mechanical Control Board (PWB-A) Low Voltage Unit (LV)
Step Check Item
Location
(Electrical
Component)
Result Action
1
Is the power source voltage being applied to
CN1LV on LV?
12-L NO
Check wiring from
power outlet to PG1 to
CN1LV.
2 Are fuses (F1 and F2) on LV conducting? - NO Change LV.
3
Are DC24 V and DC5 V being applied to
CN5V on the Mechanical Control Board?
10-K ∼L
NO Change LV.
YES Change PWB-A.
Relevant Electrical Parts
Print Control Board (PWB-P)
Control Panel (PWB-OP) Low Voltage Unit (LV)
Step Check Item
Location
(Electrical
Component)
Result Action
1
Is the power source voltage being applied to
CN1LV on LV?
12-L NO
Check wiring from
power outlet to PG1 to
CN1LV.
2 Are fuses (F1 and F2) on LV conducting? - NO Change LV.
3 Is CN10P on PWB-P properly connected? 14-B NO Reconnect.
4 Is CN20P on PWB-OP properly connected? 11-E ∼F
NO Reconnect.
YES
Change PWB-OP.
Change PWB-P.
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