Printer Monocolor: Low Image Density - Konica Minolta Bizhub C350 Service Manual

Image quality problem
4.3.17

Printer Monocolor: low image density

A. Typical Faulty Images
B. Troubleshooting Procedure
Step Section
State Confirm →
Table #
1 (Tech. Rep. Mode)
State Confirm →
2
Level History 1
(Tech. Rep. Mode)
3
4 Level History data
check results
5
6
7
LPH Assy
8
9 Imaging Unit
10 LPH Assy
ATDC Sensor win-
11
dow
Image Transfer
12
Belt Unit
13
14 Hopper Unit
15
16
bizhub C350 Field Service Ver. 2.0 April 2004
ABCDE
ABCDE
ABCDE
ABCDE
ABCDE
Check Item
Check data for Vg and Vb.
Color Vb: Around 390 V
Vg: Around 500 V
Black Vb: Around 390 V
Vg: Around 500 V
Check ATDC data.
AIDC output value is around 4.3 V.
Low ATDC and low Vg and Vb
Low ATDC and high Vg and Vb
ATDC falling within specified range
and low Vg and Vb
ATDC falling within specified range
and high Vg and Vb
LED retracting lever is locked in
position.
Dirty on the outside.
The surface of the lens array is dirty.
The color ATDC Sensor window on
the LED Assy is dirty.
Image Transfer Belt Unit makes posi-
tive contact with plates on rails.
Cam gear operates properly.
Connectors are loose.
Gear is cracked.
Toner empty lever and/or detecting
switch are defective.
4-72
4036fs4036c0
Result
NO Go to next step.
NO Go to next step.
NO Clean AIDC Sensor.
Check Image Transfer Belt for
damage.
YES Go to step 8.
YES Go to step 14.
YES Go to step 8.
YES Go to step 14.
NO Slide out the IU and reinstall.
YES Clean.
YES Clean with cleaning jig.
YES Clean.
NO Check and correct contacts.
NO Change Image Transfer Belt
Unit.
YES Reconnect.
YES Change gear.
YES Clean.
Action