Konica Minolta bizhub C450 Service Manual page 433

18. Image quality problem
Step Section
Image Process
Adjustment →
17
TCR Toner Supply
(Service Mode)
Image Process
Adjustment →
18
TCR Level Setting
(Service Mode)
Image Process
Adjustment
→Gradation Adjust
19
(Service Mode)
Image Process
Adjustment
20
→ D Max Density
(Service Mode)
Image Process
Adjustment
→ Stabilizer →
21
Reset + Stabilizer
(Service Mode)
22
396
Check Item
Toner is properly supplied when
TCR Toner Supply is run.
The problem has been eliminated
when T/C has been increased.
"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 D Max.
After the Reset + Stabilizer
sequence has been completed, run
Gradation Adjust; if the problem per-
sists, make adjustments of D Max
Density.
The problem has been eliminated
through the checks of steps up to 22.
Field Service Ver. 1.0 Mar. 2005
Result Action
NO Go to next step.
NO Go to next step.
YES Go to step 23.
NO Go to next step.
NO Go to next step.
NO Change Imaging Unit.
→ Change Image Transfer
Belt Unit.
→ Change LPH Assy.
→ Change LED Drive Board.
→ Change Copier Board.
→ Change MFP Control
Board
→ Change LPH Unit.
→ Change High Voltage Unit/
2 (Developing Bias).
→ Change High Voltage Unit/
1 (Image Transfer, Neutraliz-
ing).