Konica Minolta magicolor 7450, Руководство по обслуживанию

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Field Service Ver. 1.0 May 2006 16. Image quality problem
219
magicolor 7450
T
roubleshooting
16.3.5 Monocolor: low image density
A. Typical Faulty Images
B. Troubleshooting Procedure
ABCDE
ABCDE
ABCDE
ABCDE
ABCDE
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Step Section Check Item Result Action
1
[SERVICE MENU]
→
[DIAGNOSIS
MENU]
→
[PRINT
MENU]
→
[ELE-
MENT PAGE]
Check data for Vg and Vdc.
Color
Vdc: Around 400 V
Vg : Around 500 V
Black Vdc: Around 400 V
Vg : Around 500 V
NO Go to next step.
2 Check TCR data. NO Go to next step.
3
IDC output value is around 4.3 V. NO Clean IDC Sensor.
Check Image Transfer Belt for
damage.
4 Element data
check results Low TCR and low Vg and Vdc YES Go to step 8.
5 Low TCR and high Vg and Vdc YES Go to step 13.
6
TCR falling within specified range
and low Vg and Vdc YES Go to step 8.
7
TCR falling within specified range
and high Vg and Vdc YES Go to step 13.
8 Imaging Unit Dirty on the outside. YES Clean.
9
PH Unit The surface of the PH Window is
dirty. YES Clean with cleaning jig.
10
TCR Sensor win-
dow The color TCR Sensor window on
the LED Assy is dirty. YES Clean.
11
Transfer Belt Transfer Belt makes positive contact
with plates on rails. NO Check and correct contacts.
12 Cam gear operates properly. NO Change Transfer Belt.
13 Hopper Unit Connectors are loose. YES Reconnect.
14 Gear is cracked. YES Change gear.
15
[SERVICE MENU]
→
[DIAGNOSIS
MENU]
→
[FUNC-
TION MENU]
→
[TONER REPLEN-
ISH]
Toner is properly supplied when
TONER REPLENISH is run. NO Go to next step.