Sharp SF-1014 Service Manual page 83

Purpose/kind Section
Adjustment Optical unit
Developer unit
Main Sub
code code
50 1 Used to adjust the copy image position on the copy paper.
(Operation/procedure)
The adjustment is performed by changing the three set values A, B.
The zoom machine has two set values, the SPF machine three, but the
normal machine only one.
When the simulation key operation is performed, warming-up is performed
and the ready lamp is lighted. Then the currently set value is displayed on the
COPIES SELECTED display. In the case of the zoom machine, there are
three set values. Every time when the tray select key is pressed, set values A,
B is displayed in turn. In this case, the pause lamp status allows monitoring
the three set values.
Display lamp
Copier tray cassette paper feed
lamp BLINKS.
Tray cassette paper feed lamp ON
Set all three set values A, B to "0", make copies at 64% and 129% and
measure the shift between the copy paper lead edge and the copy image. Put
the measure values into the following formulas to obtain the rough values of A
and B.
L1 = Shift between 129% copy paper lead edge and copy image (mm)
L2 = Shift between 64% copy paper lead edge and copy image (mm)
A = 8.2423 x (L1 – L2)
It corresponds to the time required for the scanner to reach the document lead
edge image position from starting scanning.
It is, in other word, the value used to determine the optical position of the
document lead edge reference position of the document table, and must be
fitted to the edge section of the document reference plate.
If this value is not proper, the distance between the copy image lead edge and
the purpose edge is varied when the copy magnification ration is varied.
B = 16.0568 x L2 – 7.9661 x L1 (Only in the zoom model)
It corresponds to the timer required for the resist roller (RRC) to turn on from
when the scanner started scanning and reached the optical document lead
edge reference position.
This set value is used to determine the paper feed timing for the image
position on the OPC drum, and the relationship between the paper and the
image is changed.
C = 8.0906 x L3 (timer value) (Only in the SPF machines)
This set value is used to change the paper feed timing for the scanning start
timing (the image position on the OPC drum), and to change the relationship
between the paper and the image position.
In the non zoom model only set value "A"
8 1 Used to check the developing bias voltage.
(Operation/procedure)
The developing bias voltage is outputted for 30 sec.
25 2 Used for initial setting of toner density when replacing developer.
Contents
Description
B (Only in the zoom machine).
A
Reaching the
Mirror unit document lead
scan start edge position
A
B
RRC ON
8 – 6
Ref. page
Set value
7-19
7-30
4-5