AR-206 (serv.man4). AR163 206-Service Manual - Sharp Copying Equipment Service Manual (repair manual). Page 20

Note:

•

Use a digital multi-meter with an internal resistance of
10M

Ω or more.

1) Set the digital multi-meter range to DC700V. 

2) Put the test rod of the digital multi-meter on the developing bias

voltage output check pin. 

3) Turn on the power.

4) Adjust the adjustment volume VR31 so that the output voltage is

within the specified range shown below.

Mode

Specification

Developing bias voltage

DC-400

±8V

VR31

Note:

•

Use a digital multi-meter with an internal resistance of
10M

Ω or more.

1) Set the digital multi-meter range to DC700V.

2) Put the test rod of the digital multi-meter on the grid bias voltage

output check pin. 

3) Turn on the power. 

4) Adjust the adjustment volumes (VR51, VR52) so that the output

voltage is within the specified range. (The voltage is outputted in
the grid bias high output mode during warming up, and in the grid
bias low output mode after completion of warming up.)

Mode

Specification

Grid bias LOW

DC-400

±20V

VR52

Grid bias HIGH

DC-525

±10V

VR51

a. OC image lead edge position adjustment
Note: In advance to this adjustment, the sub scanning magnification

ratio adjustment must be performed.

1) Set a scale on the OC table as shown below.

2) Make a copy.

3) Check the copy output. If necessary, perform the following adjust-

ment procedures.

4) Execute SIM 50-1.

5) Set the OC lead edge position set value (Exposure display

<AUTO> ON) to “99.”
The OC image scanning start position is shifted inside the docu-
ment edge.

6) Set the main cassette lead edge void adjustment value (Exposure

display <PHOTO> ON) * to “1.”
The lead edge void becomes the minimum.

7) Set the print start position value (Exposure display <EXP1> ON)

to “99” and make a copy.
The print start position is shifted inside the document edge.

8) Measure the image loss R of the copied image. Enter the set

value of the image scanning lead edge position (Exposure display
<AUTO> ON) again.

•

1 step of the set value corresponds to about 0.127mm shift.

•

Calculate the set value from the formula below.

99 - R/0.127 (mm) = Image loss set value <R: Image loss meas-
urement value (mm)>

Example: 99 - 4/0.127 = 99 - 31.5 = about 67

Note: If the set value is not obtained from the above formula,

perform the fine adjustment.

5

10

5mm

4mm

*

The dimension varies depending on the model.

10

5mm

0mm

5

*

 The scanning edge is set. 

   (A line may be printed by scanning the document edge.)
 

AR-162 [6] ADJUSTMENT 11/1/2000

AR-162 ADJUSTMENTS – 2