45530603TH Rev.2
4-38
Oki Data CONFIDENTIAL
4. TROUBLESHOOTING PROCEDURE
(1-2)
Error message related to the control panel
Check item
Check work
Actions to be taken
at NG
(1-2-1) Error message
Error message
Check the error contents by referring to the
Error Message List.
Follow the
instruction.
(1-3)
“RAM checking” or “Initializing” remains displayed.
Check item
Check work
Actions to be
taken at NG
(1-3-1) Control panel displays freezes.
Control panel
display
The control panel keeps displaying “RAM
Check” or “Initializing.”
Replace the PU/
CU PCB.
If the problem
remains
unsolved after
replacement
of DIMM or
removal of HDD,
replace the PU/
CU PCB.
4.5.2.(2) Abnormal operations of the printer after the power is turned on
(2-1)
Any operation does not start at all.
Check item
Check work
Actions to be taken
at NG
(2-1-1) Check the peripherals of the power supplies
AC power that is
supplied to the printer
Check the supplied voltage of the AC power
source.
Supply the AC
power.
5V power and 24V
power that are
supplied to the PU/
CU PCB
Check the power supply voltages at the
POWER connector of the PU/CU PCB.
24V: pin-13, -14, and -16
5V: pin-8, -10 and -21
5VS: pin-19
0V: pin-9, -11, -12, -15, -18, -20, and -22
Replace the low
voltage power
supply unit.
(2-1-2) Power switch LED check
Power switch LED
Check if the LED light stays off.
Replace one
of the following
in turn: low
voltage power
supply unit,
PU/CU PCB,
control panel
PCB, power SW
board, and the
cable between
respective PCBs
When blinking,
replace one of
the following in
turn: low voltage
power supply
unit, PU/CU
PCB, and the
cable between
the low voltage
power supply
unit and the PU/
CU PCB.