Power Failure - Minolta Di151 Service Manual

FrameMaker Ver.5.5E(PC) Di151 TROUBLESHOOTING
00.03.10
(8)

Power Failure

Power Supply Board PU1
Power Switch S1
Upper Unit Interlock Switch S2
L 1
Plug
2
N
S1
in
L
G
N
GND
• Power failure
Step Check
1 No power is supplied when the Power Switch is
turned ON.
Blown Fuse 1 of the Power Supply Board.
2 Only the display and Fusing Section Cooling
Fan Motor operate.
The voltage across PJ30-2 on the Power Sup-
ply Board and GND is DC24 V when the Power
Switch is turned ON.
3 Only the Fusing Section Cooling Fan Motor
operates.
The voltage across JP7-2/3 on the Control
Board and GND is DC5 V when the Power
Switch is turned ON.
4 Only the display and Scanner operate.
The voltage across PJ7A-4 on the Master
Board and GND is DC5 V when the Power
Switch is turned ON.
Relevant Electrical Parts
Control Board PWB-I
Master Board PWB-A
PJ30-2(DC24V OUT)
PU1
ST2
ST1
PJ31-1 (DC24V)
PJ31-3 (DC15V)
PJ31-4 (DC15V)
PJ31-5 (DC-9V)
PJ31-6 (DC-9V)
PJ31-7 (GND)
PJ31-8 (GND)
PJ32-1 (DC5V)
PJ32-2 (DC5V)
PJ32-3 (DC5V)
PJ32-4 (GND)
PJ32-5 (GND)
PJ32-6 (DC5V REM/SLP)
PJ32-7 (DC24V REM/SLP)
Result
YES Change Fuse 1 of Power
NO
YES Change Upper Unit Inter-
NO
YES Change Control Board.
NO
YES Change Master Board.
NO
T-17
S2
PWB-A
PJ7A-1 (DC24V IN)
PJ7A-2 (GND)
PJ7A-3 (GND)
PJ7A-4 (DC5V)
PJ17A-2 (DC15V IN)
PJ17A-1 (DC-9V IN)
PWB-I
JP7-1 (DC24V IN)
JP7-2 (DC5V)
JP7-3 (DC5V)
JP7-4 (DC15V)
JP7-5 (DC-9V)
JP7-6 (GND)
JP7-7 (GND)
JP7-8 (DC5V REM/SLP)
JP7-9 (DC24V REM/SLP)
4007C12TAC
Action
Supply Board.
Change Power Switch.
Change Power Supply
Board.
lock Switch.
Change Control Board.
Change Master Board.
Change Power Supply
Board.
Change Power Supply
Board.
Change Power Supply
Board.