Oki S900, Service Manual

Page: 34 / 65

S900
5-6
5.2.1 LCD DOES NOT DISPLAY
Table 5.1
Cause Relevant Unit Check Method Maintenance Method
Unplugged from
outlet
None Visual check Insert the AC plug into
the outlet
DC power
unplugged from
unit
None Visual check
Insert the DC power adapter
cable into the unit
AC voltage
failure
None AC outlet
voltage check
None
Power adapter
output voltage
failure
Power unit Output voltage
(+24v) check
Replace the power unit
PCB failure Main control
PCB
Tester check
(+24V, GND)
Remove the cause or replace
the PCB
LCD module
main board
connection
failure
LCD module
main board
Visual check
Plug the connector and
secure it firmly
5.2.2 PRINTER DOES NOT REACT
Table 5.2
Cause Relevant Unit Check Method Maintenance Method
Printer cable failure Printer cable Visual check Secure printer cable firmly
or replace the printer
cable
Main PCB Visual check Replace the PCB
Printer paper jam Visual check Remove paper
Printer link failure Printer paper empty Visual check Insert paper
Printer problem Visual check See printer manual
Printer busy Visual check Wait till printer ready