Printer Monocolor: Uneven Density In Fd - Minolta CF2002 Service Manual

(15) Printer Monocolor: uneven density in FD

<Troubleshooting Procedure>
Section Step
Image 1 Uneven density of void area
check occurs.
High image 2 Uneven density in FD occurs
density at a pitch of 40 mm to 50 mm
original when a multi-copy cycle is run
using an original with high
image density (50 % or more).
LPH Assy 3 LED retracting lever is locked
in position.
IU 4 The surface of the PC Drum is
scratched.
5 Dirty on the outside.
LPH Assy 6 LED surface is dirty.
Image 7 Cam gear operates properly.
Transfer
Belt Unit
8 The problem has been elimi-
nated through the checks of
steps up to 7.
<Typical Faulty Images>
4011T031AA
4011T042AA
Check Item
T-89
4004T011AA
Result Action
YES Check LPH Unit connector for
proper connection.
Check the LED Drive Board
connectors for proper connec-
tion.
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 IU.
YES Clean.
YES Clean using the LED Cleaning
Jig.
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).