Completely Blank Printout - Kyocera FS-6970DN Service Manual

(1) Completely blank printout.

Print example
No trans-
fer
charging.
No
develop-
ing bias
output.
No laser
beam
output.
Causes
Poor contact of engine
PWB's transfer bias out-
put terminal and printer's
contact (spring).
Printer bottom
Contact
(spring)
Engine PWB
Main charger
output terminal
Defective engine PWB.
Poor contact of engine
PWB's developing bias
output terminal and
printer's contact (spring).
Poor contact of engine
PWB's developing bias
output terminal and devel-
oper unit's contact.
Developing
bias output
terminal
Printer inside
Defective engine PWB.
Defective laser scanner
unit.
Defective main PWB.
Check procedures/corrective measures
Check the installation position of the engine PWB.
Refer to figure 1-4-3 below.
Contact
(spring)
Developing bias
output terminal
Figure 1-4-3
Replace the engine PWB (See page P.1-5-23).
Check the installation position of the engine PWB
(Refer to figure1-4-3 above and P.1-5-23).
Check the installation of the developer unit.
Refer to figure 1-4-4 below.
Developing unit
A
A
Figure 1-4-4
Replace the engine PWB (See page P.1-5-23).
Replace the laser scanner unit (See page P.1-5-35).
Replace the main PWB (See page P.1-5-27).
Contact
(spring)
Contact
(spring)
Separation bias Transfer bias
output terminal output terminal
Contact
2J5
1-4-9