Konica Minolta Bizhub 20p Service Manual page 83

■ NEW TONER IS NOT DETECTED
Step
New toner actuator catching on
1
some position
New toner actuator spring loose
2
New toner sensor PCB ASSY
harness connection failure
3
4 New toner actuator failure
New toner sensor PCB ASSY
5
failure
6 Main PCB ASSY failure
■ LED FAILURE
Step
Panel PCB harness connection
1
failure
2 Panel PCB failure
3 Main PCB ASSY failure
■ PRINTER STOPS WHILE IDLING
Step
1 Front cover is opened
Process unit electrode dirty
2
3 Main PCB ASSY failure
Idling: To keep the toner evenly without one-sided. When turn the power ON or start the
printing, Turn the exposure drum or develop roller before stating the printing.
Cause
Cause
Cause
Replace the front cover.
3-26
Remedy
Re-assemble the new toner actuator.
Re-assemble the new toner actuator
spring.
Check the sensor performance following
the procedure in "Factory Inspection Mode"
in 1.3 Service Mode in Chapter
If any problem occurs, check the harness
connection of the new toner sensor PCB
ASSY, then reconnect it.
Replace the new toner actuator.
Replace the new toner sensor PCB ASSY.
Replace the main PCB ASSY.
Remedy
Check the harness connection of the panel
PCB, then reconnect it.
Replace the panel PCB.
Replace the main PCB ASSY.
Remedy
Clean the electrodes on the process unit.
(Refer to Fig. 3-2.)
Replace the main PCB ASSY.
6.
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