Printer Monocolor: Gradation Reproduction Failure - Minolta CF2002 Service Manual

(18) Printer Monocolor: gradation reproduction failure

<Troubleshooting Procedure>
Section Step
Photo/ 1 Original type and screen pat-
Density tern are selected properly.
LPH Assy 2 LED retracting lever is locked
in position.
IU 3 Dirty on the outside.
LPH Assy 4 The surface of the lens array
is dirty.
ATDC Sensor 5 ATDC Sensor window is dirty.
window
State Confirm 6 AIDC output value is around
→
4.2 V.
Level His-
tory 1 (Tech.
Rep. Mode)
Gradation 7 "Conv. Value" falls within the
Adjust (Tech. specified range as checked
Rep. Mode) through Gradation Adjust.
Max: 0 ±100
Highlight = 0 ±60
Image Adjust 8 The problem has been elimi-
→
nated through the adjust of
PRT Max
PRT Max.
Density (Tech.
Rep.Mode)
Image Adjust 9 The problem has been elimi-
→
nated through the adjust of
PRT High-
PRT Highlight.
light (Tech.
Rep. Mode)
<Typical Faulty Images>
4011T034AA 4011T029AA
Check Item Result
YES Slide out the Imaging Unit
YES Clean.
YES Clean with cleaning jig.
YES Clean.
T-93
Action
NO Change screen pattern.
and reinstall.
NO Clean AIDC Sensor.
Check Image Transfer Belt
for damage.
NO Go to step 11.
NO Go to next step.
NO Go to next step.