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(7) Foggy Background
<Troubleshooting Procedure>
Step
1
Is extraneous light striking the interior of
the copier?
2
Do the data for "VB Shift," "Background
Voltage," "ATDC Level Setting," and "AE
Adjust" available from the "Image Adjust"
mode menu of the Service mode repre-
sent the standards?
3
Open the "Test Print" screen from the Service mode menu. Select "Halftone" and
set the level to "0" to make copies in each color.
4
Of C, M, and Y, on which color copy does
foggy background show?
5
Using the settings as in step 3, make copies of each color again.
6
Does foggy background persist?
7
On which color copy does foggy back-
ground show, C, M, or Y?
8
Does the sensor output record 10% or
more during agitation?
9
Is the ATDC Sensor window seriously
dirty with developer?
10
Does the developer exist inside the ATDC
Sensor window?
Check Item
T-65
1144T013AA
Result
YES Block the extraneous light.
NO
A. Change the data to the
standard values.
Note:
If the data for "ATDC Level
Setting" are changed,
make about 20 copies from
the standard chart and turn
OFF and ON the Power
Switch.
B. Run "Gradation Adjust"
three times.
YES Using "Developer Mode" and
"ATDC Sensor," agitate the
color of the developer showing
foggy background.
NO
Using "Developer Filling"
selected from "Developer," fill
black developer.
NO
End.
NO
Go to step 16.
NO
Go to step 12.
YES Go to step 12.
YES Change the ATDC Sensor.
("Developer" and "Gradation
Adjust")
Action
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