From The Startup Screen After Power-On; Error Messages Related To Operator Panel Are Displayed; 2) Abnormal Operations Of Printer After The Power Is Turned On; Any Operation Does Not Start At All - Oki MC860 Maintenance Manual

Oki Data CONFIDENTIAL

(1-2) From the startup screen after power-on:

Check item
(1-2-1) Check the system connection
Connection between Check if the cable from the low voltage
the low voltage power supply to the POWER connector
power supply unit the MZA PCB is normally connected or not.
and the MZA PCB 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.
Cable assembly Check if the cable has open circuit or not.
connecting the Check if sheath of the cable has not peeled
low voltage power off or not.
supply unit and the Check if the cable assembly is defective such
MZA PCB as internal wires are disconnected or not.
Connection of the Check that the scanner unit connector of
MZA scanner the MZA PCB is normally connected.
FFC connecting the Check that the 11-conductor FFC is
MZA PCB and the connected to the conector
TB2 PCB Check that the connection with the MZA
PCB is normal. 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.
Direct connection Check that the MZA PCB is not installed in
between the TB2 the wrong position by the visual check.
PCB and the MZA
PCB

(1-3) Error messages related to Operator Panel are displayed.

Check item
(1-3-1) Error message
Error message Check the error contents by referring to the
Error Message List.
43967002TH Rev. 1
Check work Action to be taken at NG
Re-connect the
of cable normally.
Replace the cable
with the normal
cable.
Re-connect the
cable normally.
Re-connect the
CU PCB. cable normally.
Re-install the MZA
PCB into the correct
position.
Check work Action to be taken at NG
Follow the
instruction.

7.5.2.(2) Abnormal operations of printer after the power is turned on

(2-1) Any operation does not start at all

Check item
(2-1-1) Check the peripherals of the power supplies
Primary AC power Check the supplied voltage of the AC
source that is power source.
connected to the
printer.
Voltage setting of Measure the AC voltage supplied.
the lower voltage Check the power voltage setting of the
power supply unit equipment in use.
(100V system/230V (Check the shorting plug that is used for
system) selection of the voltage power supplies.
[CN6]) Shorting plug is Used/Not used =
100V system/230V system.
5V power and 24V Check that power supply circuit has no
power that are short-circuit at the POWER connector pin
supplied to the PU of the POWER PCB.
PCB.
Pin-4, -5, -6: 24V
Pin-7: 5V
Pin-8: 0VL
Pin-1, -2, -3: 0VP
7. Troubleshooting
Check work Action to be taken at NG
Supply the AC
power.
Set the low voltage
power supply
setting.
Replace the low
voltage power
supply unit.
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