FrameMaker Ver.5.5(PC) Di251/Di351 TROUBLESHOOTING
05.03.01
T- 4 6
(8) The Copier Does not Turn ON.
• Touch Panel indicates nothing.
Relevant Electrical Parts
Power Switch S1
Power Supply Unit PU1
Panel Board PWB-F
Inverter Board 2 PU3
Touch Panel UN1
MFB2 Board MFB2
Master Board PWB-A
Step Check Result Action
1 Power supply voltage check: the voltage across
PJ1PU1-1 and -3 of Power Supply Unit
changes from AC 0 V to the rated AC voltage
when the Power Switch is turned ON.
NO Check the power outlet
voltage.
Check the power cord for
continuity.
Check Power Switch.
2 The voltage across PJ5S1-1 on Power Switch
and GND is DC20 V or more when Power
Switch is turned ON.
YES Change Master Board.
3 DC24-V output check: the voltage across
PJ8PU1-2 on Power Supply Unit and GND
changes from DC0 V to DC24 V when the
Power Switch is turned ON.
NO Change Power Supply
Unit.
4 DC5-V output check: the voltage across
PJ6PU1-6 on Power Supply Unit and GND
changes from DC0 V to DC5 V when the Power
Switch is turned ON.
NO Change Power Supply
Unit.
5 DC24-V output check:
Unplug CN1F on Panel Board.
The voltage across CN1F-1 on cable end and
GND, and the voltage across CN1F-2 on cable
end and GND, change from DC0 V to DC24 V
when the Power Switch is turned ON.
NO Change MFB2 Board.
6 DC5-V output check:
Unplug CN1F on Panel Board.
The voltage across CN1F-28 on cable end and
GND, and the voltage across CN1F-29 on
cable end and GND, change from DC0 V to
DC5 V when the Power Switch is turned ON.
NO Change MFB2 Board.
7 DC24-V output check: the voltage across
CN7F-1 on Panel Board and GND changes
from DC0 V to DC24 V when the Power Switch
is turned ON.
NO Change Panel Board.
8 AC output check: there is an AC output across
CN2PU3-1 and 4 on Inverter Board 2 when the
Power Switch is turned ON.
YES Change Touch Panel.
NO Change Inverter Board 2.
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