Printer Monocolor: Gradation Reproduction Failure - Konica Minolta bizhub C350 Service Manual

Image quality problem
4.3.18

Printer Monocolor: gradation reproduction failure

A. Typical Faulty Images
B. Troubleshooting Procedure
Step Section
Photo/Density
1
LPH Assy
2
3 Imaging Unit
4 LPH Assy
ATDC Sensor
5
window
State Confirm →
Level History 1
6
(Tech. Rep.
Mode)
Gradation Adjust
(Tech. Rep.
7 Mode)
Image Adjust
→ PRT Max
8
Density (Tech.
Rep.Mode)
Image Adjust
→ PRT High-
9
light (Tech. Rep.
Mode)
Image Adjust
→ Stabilizer →
10 Reset + Stabi-
lizer (Tech. Rep.
Mode)
4-74
4036fs4048c0
Check Item
Original type and screen pattern are
selected properly.
LED retracting lever is locked in
position.
Dirty on the outside.
The surface of the lens array is dirty.
ATDC Sensor window is dirty.
AIDC output value is around 4.3 V.
"Conv. Value" falls within the speci-
fied range as checked through Gra-
dation Adjust.
Max: 0 ± 100
Highlight = 0 ± 60
The problem has been eliminated
through the adjust of PRT Max.
The problem has been eliminated
through the adjust of PRT Highlight.
After the Reset + Stabilizer
sequence has been completed, run
Gradation Adjust; if the problem per-
sists, make adjustments of PRT Max
Density and PRT Highlight.
bizhub C350 Field Service Ver2.0 Sep. 2004
4036fs4049c0
Result
NO Change screen pattern.
YES Slide out the Imaging Unit and
reinstall.
YES Clean.
YES Clean with cleaning jig.
YES Clean.
NO Clean AIDC Sensor.
Check Image Transfer Belt for
damage.
YES Go to step 11.
NO Go to next step.
NO Go to next step.
NO Go to next step.
Action