Printer Monocolor: Low Image Density - Minolta CF2002 Service Manual

(17) Printer Monocolor: low image density

<Troubleshooting Procedure>
Section Step
→
1
State Confirm
Table #
(Tech. Rep. Mode)
→
2
State Confirm
Level History 1
3
(Tech. Rep. Mode)
Level History data 4
check results
5
6
7
LPH Assy 8
IU 9
LPH Assy 10
ATDC Sensor win- 11
dow
<Typical Faulty Image>
4011T003AA
Check Item
Check data for Vg and
Vb.
Color Vb: Around 400 V
Vg: Around 550 V
Black Vb: Around 400 V
Vg: Around 550 V
Check ATDC data.
AIDC output value is
around 4.5 V.
Low ATDC and low Vg
and Vb
Low ATDC and high Vg
and Vb
ATDC falling within spec-
ified range and low Vg
and Vb
ATDC falling within spec-
ified 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.
T-91
Result Action
NO Go to next step.
— 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. Change ATDC.
Change IU.