Printer Monocolor: Uneven Density In Fd - Konica Minolta Bizhub C350 Service Manual

Includes: standard controller df-601 pc-101/pc-201 pc-401 ad-501 fs-501
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Image quality problem
4.3.15

Printer Monocolor: uneven density in FD

A. Typical Faulty Images
B. Troubleshooting Procedure
Step
Section
Image check
Uneven density of void area occurs. YES Check LPH Unit connector for
1
High image
Uneven density in FD occurs at a
density original
pitch of 40 mm to 50 mm when a
2
multi-copy cycle is run using an
original with high image density
(50% or more).
LPH Assy
LED retracting lever is locked in
3
position.
Imaging Unit
The surface of the PC Drum is
4
scratched.
5
Dirty on the outside.
LPH Assy
LED surface is dirty.
6
Image check
Monocolor uneven image (uneven
7
high density) occurs.
Image Transfer
Cam gear operates properly.
8
Belt Unit
The problem has been eliminated
through the checks of steps up to 8.
9
bizhub C350 Field Service Ver. 2.0 April 2004
4036fs4043c0
4036fs4044c0
Check Item
4-70
4036fs4045c0
Result
Action
proper connection.
Check the LED Drive Board con-
nectors for proper connection.
YES Feed 10 to 20 blank sheets of
paper with no originals placed, as
the IU fails to keep up with a high
demand for toner.
NO
Slide out the IU and reinstall.
YES Change Imaging Unit.
YES Clean.
YES Clean using the LED Cleaning
Jig.
YES Select "Tech. Rep. Mode" →
"Machine Adjust" → "LPH Rank"
and run "LPH Rank."
NO
Change Image Transfer Belt
Unit.
NO
Change IU.
→ Change Image Transfer Belt
Unit.
→ Change LPH Assy.
→ Change PIC Board.
→ Change LED Drive Board
→ Change LPH Unit.
→ Change High Voltage Unit
(Image Transfer, Neutralizing).

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