Lcd Does Not Display; Printer Does Not React - Oki S900 Service Manual

S900

5.2.1 LCD DOES NOT DISPLAY

Cause
Unplugged from
outlet
DC power
unplugged from
unit
AC voltage
failure
Power adapter
output voltage
failure
PCB failure
LCD module
main board
connection
failure

5.2.2 PRINTER DOES NOT REACT

Cause
Printer cable failure
Printer link failure
Table 5.1
Relevant Unit Check Method
None Visual check
None Visual check
None AC outlet
voltage check
Power unit Output voltage
(+24v) check
Main control Tester check
PCB (+24V, GND)
LCD module Visual check
main board
Table 5.2
Relevant Unit
Printer cable
Main PCB
Printer paper jam
Printer paper empty
Printer problem
Printer busy
5-6
Maintenance Method
Insert the AC plug into
the outlet
Insert the DC power adapter
cable into the unit
None
Replace the power unit
Remove the cause or replace
the PCB
Plug the connector and
secure it firmly
Check Method Maintenance Method
Visual check Secure printer cable firmly
or replace the printer
Visual check
Visual check
Visual check
Visual check
Visual check Wait till printer ready
cable
Replace the PCB
Remove paper
Insert paper
See printer manual