2F8/2F9/2GA-2
1-4-9
(2) All-black printout.
Print example Causes Check procedures/corrective measures
No
develop-
ing bias
output.
Poor contact of engine
PWB’s developing bias out-
put terminal and printer’s
contact (spring).
Check the installation position of the engine PWB.
Refer to figure1-4-3 above.
Poor contact of engine
PWB’s developing bias out-
put terminal and developer
unit’s contact.
Check the installation of the developer unit.
Refer to figure 1-4-4 below.
Figure 1-4-4
Defective engine PWB. Replace the engine PWB (See page P.1-5-22).
No laser
beam
output.
Defective laser scanner unit.
Replace the laser scanner unit (See page P.1-5-32).
Defective main PWB. Replace the main PWB (See page P.1-5-26).
Print example Causes Check procedures/corrective measures
No main
charging.
Defective main charger unit.
Replace the main charger unit (See page P.1-5-11).
Poor contact of engine
PWB’s main charger output
terminal and main charger
unit’s contact (spring).
Check the installation of the drum (main charger) unit.
Refer to figure 1-4-5 below.
Figure 1-4-5
Poor contact of engine
PWB’s main charger out-
put terminal and printer’s
contact (spring).
Check the installation position of the engine PWB.
(See page P.1-5-22 and P.1-4-8, refer to figure 1-4-3)
Defective engine PWB. Replace the engine PWB (See page P.1-5-22).
Contact
Developing unit
Developing
bias output
terminal
Printer inside
Contact
(spring)
Contact
(spring)
Main charger
unit
Drum PWB
connector (YC1)
Drum unit
Drum unit
A
A
B
B
C
C
Printer
left side
Drum
grounding
terminal
Main
charger
output
terminal
Connect-L PWB
connector (YC3)
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