45376001TH Rev.1
162 /
Oki Data CONFIDENTIAL
7. Troubleshooting and repair procedure
7.5.4. (1) LCD display error
Memo For the numbers from
①
through
after name of the respective connectors,
refer to section 7.5.4 (19) "Wiring diagram".
(1-1) LCD does not display anything.
Check item Check work
Action to be taken
at NG
(1-1-1) Check
CU board Replace CU
board.
(1-1-2) Check the system connection
Connection between
the low voltage
power supply unit
and the CU board.
Check if the cable from the low voltage power
supply to the POWER connector
of the CU
board is normally connected or not.
Check if the connector is connected only in the
half-way or not, and check if the connector is
inserted in slanted angle or not.
Re-connect the
cable normally.
Cable assembly
connecting the low
voltage power supply
unit and the CU/PU
board.
Check if the cable is half-open circuit.
Check if sheath of the cable has not peeled off
or not.
Check if the cable assembly is defective such as
internal wires are disconnected or not.
Replace the
cable with the
normal cable.
Note!
Connection between
the CU board and
Operator Panel
Check if the cable is connected to the OPE
connector
of the CU board normally or not.
Check if the connector is connected in the half-
way only or not, and check if the connector is
inserted in a slanted angle or not.
Re-connect the
cable normally.
Connecting the
CU board and the
Operator Panel
board
Check if the cable has open circuit or not with
VOM. Check if sheath of the cable has not
peeled off or not by visual inspection.
Replace the
OPE unit
Check item Check work
Action to be taken
at NG
(1-1-3) Check the peripherals of the power supplies
Primary AC power
source that is
connected to the
printer.
Check the supplied voltage of the AC power
source.
Supply the AC
power.
5V power that is
supplied to the CU/
PU board.
Check for the 5V power supply at
PU
⑦
:Pin-11,13
CU
⑦
:Pin-1,2,3
of the POWER connector of the CU/PU board.
Replace the low
voltage power
supply.
(1-1-4) Check that power supply circuit has no short-circuit.
5V power and 24V
power that are
supplied to the CU/
PU board.
Check that power supply circuit has no short-
circuit at the POWER connector
⑦
of the
CU board. The follow voltage must appear
respectively.
PU
⑦
Pin 1,2,3,4:24V
Pin 5,6,7,8:0VP
Pin 9,10:0VL
Pin 11,13:5V
CU
⑦
Pin 1,2,3:5V
Pin 4,5,6:0VL
Pin 10,11:0VP
Pin 12,13:24V
If any voltage does not appear and short-circuit
is detected, locate the source of the short-circuit
as follows:
Disconnect the cables that are connected to the
CU board one cable after another until location
of the short-circuit is found out.
Replace the part
causing short-
circuit.
(1-2) Error messages related to Operator Panel are displayed.
Check item Check work
Action 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.
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