Image Formation Problems - Kyocera FS-2000D Service Manual

2F8/2F9/2GA-2
1-4-3

Image formation problems

(1)Completely blank
printout.
P.1-4-8/P.1-4-9
(6)Black vertical
streaks.
P.1-4-12
(1) Completely blank printout.
Print example
No trans-
fer
charging.
(Continued on
next page.)
1-4-8
(2)All-black printout. (3)Dropouts.
P.1-4-9
(7)Unsharpness. (8)Gray background.
P.1-4-12
Causes
Poor contact of engine
PWB's transfer bias out-
put terminal and printer's
contact (spring).
Printer bottom
Engine PWB
Main charger
output terminal
Defective engine PWB.
(4)Black dots.
P.1-4-10
(9)Dirt on the top
edge or back of the
paper.
P.1-4-13
Check procedures/corrective measures
Check the installation position of the engine PWB.
Refer to figure 1-4-3 below.
Contact
Contact
(spring)
(spring)
Developing bias
output terminal
Figure 1-4-3
Replace the engine PWB (See page P.1-5-22).
(5)Black horizontal
streaks.
P.1-4-10 P.1-4-12
(10)Undulated print-
ing at the left edge
(scanning start posi-
tion).
This vertical
line should
be straight.
P.1-4-13 P.1-4-13
Contact
(spring)
Separation bias Transfer bias
output terminal output terminal
Contact
(spring)