Image quality problem bizhub C350 Field Service Ver. 2.0 April 2004
4-70
IV
Troubleshooting
4.3.15 Printer Monocolor: uneven density in FD
A. Typical Faulty Images
B. Troubleshooting Procedure
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Step Section Check Item Result Action
1
Image check Uneven density of void area occurs. YES Check LPH Unit connector for
proper connection.
Check the LED Drive Board con-
nectors for proper connection.
2
High image
density original
Uneven density in FD occurs at a
pitch of 40 mm to 50 mm when a
multi-copy cycle is run using an
original with high image density
(50% or more).
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.
3
LPH Assy LED retracting lever is locked in
position.
NO Slide out the IU and reinstall.
4
Imaging Unit The surface of the PC Drum is
scratched.
YES Change Imaging Unit.
5 Dirty on the outside. YES Clean.
6
LPH Assy LED surface is dirty. YES Clean using the LED Cleaning
Jig.
7
Image check Monocolor uneven image (uneven
high density) occurs.
YES Select “Tech. Rep. Mode” →
“Machine Adjust” → “LPH Rank”
and run “LPH Rank.”
8
Image Transfer
Belt Unit
Cam gear operates properly. NO
Change Image Transfer Belt
Unit.
9
The problem has been eliminated
through the checks of steps up to 8.
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).
FS4.fm Page 70 Tuesday, April 27, 2004 4:01 PM
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