Blank Copy, Black Copy - Konica Minolta magicolor 4690MF Service Manual

19. Image quality problems
19.1.12

Blank copy, black copy

A. Typical faulty images
B. Troubleshooting procedure
Step Section
1 Image check
2
Imaging unit
3
High voltage
4
unit/1, /2
5
308
blank print
Check item
Does a blank print occur?
Is the coupling of the imaging unit
drive mechanism installed prop-
erly?
Is the charge corona voltage con-
tact or photo conductor ground
contact of the imaging unit con-
nected properly?
Is the connector corrected prop-
erly?
Has the problem been eliminated
through the checks of steps up to
4?
Field Service Ver. 1.0 May 2008
black print
Result Action
Check the PH unit connector for
YES
proper connection.
Check or correct drive transmit-
NO ting coupling or change the imag-
ing unit.
Check, clean, or correct the con-
NO
tact.
NO Reconnect.
Change the high voltage unit/1.
Change the high voltage unit/2.
NO
Change the print control board.
Change the PH unit.
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