AR-M351U, AR-M451U (serv.man16). Adjustments - Sharp Copying Equipment Service Manual (repair manual). Page 6

AR-M351U/M451U, AR-M355U/M455U  ADJUSTMENTS  8 - 6

• Adjustment on the engine side (If there is no problem in self

print, no need to adjust.)

• OC scan off-center

• OC scan lead edge adjustment

1) Make a test chart as shown below. (Make a self-print pattern

71.)

2) Make a copy from the table glass, and check it. 

At that time, set the test chart correctly. If it is set in a distorted
position, the adjustment cannot be made correctly.

3) If the output value is not in the specified range, perform the fol-

lowing adjustment. 

4) Adjust the distortion.

Use a level gauge to check that the scanner is installed hori-
zontally.

Make a copy and check it. If there is any distortion as shown in
Fig. 1 or Fig. 2, loosen the scanner fixing screw (M4 x 8) and
the cam A fixing screw (M3 x 12) and adjust.

Shift cam A in the direction A by the difference in the copy image.

For one scale (one groove), shift by 0.5mm.

After shifting, tighten the fixing screw (M3 x 12) of cam A and
make a copy again, and check the copy again to insure that there
is no distortion. 

Shift cam A in the direction B by the difference in the copy image. 

For one scale (one groove), shift by 0.5mm. 

After shifting, tighten the fixing screw (M3 x 12) of cam A and
make a copy again, and check the copy again to insure that there
is no distortion.

After adjustment, tighten the fixing screw (M3 x 12) and the scan-
ner fixing screw (M4 x 8).

∗

If the above adjustment does not fix the problem, perform the
MB rail adjustment.

∗

After the OC distortion adjustment, perform SIM53-8 SPF scan-
ning position automatic adjustment.

• Nothing special

• Nothing special

1) Close the (D)SPF.

2) Check to confirm that the dove and the reference plate in the

figure below are in contact with the table glass (point a) and
the side guide (point b). (Place copy paper under the dove and
pull it out.) If they are not in contact, adjust with the set screw.

Set position

Specification

Set 

value

Lead edge void 
adjustment
“LEAD EDGE 
VOID (DENA)”

Output pattern 
“71” print void 
quantity A

A = 4.0mm or 
less
(A and B total: 
8.0mm or less)

Shift of 
0.1mm 
for set 
value 1.

Rear edge void 
adjustment
“TAIL EDGE VOID 
(DENB)”

Output pattern 
“71” print void 
quantity B

B = 4.0mm or 
less
(A and B total: 
8.0mm or less)

Side edge void 
adjustment
“FRONT/REAR”

Output pattern 
“71” print void 
quantity C + D

C and D total: 
8.0mm or less

2

SIMULATION 50-1

LEAD EDGE ADJUSTMENT. SELECT 0-9, AND PRESS START.

0.TRAY SELECT 

1

   1.COPY START

2.MAGNIFICATION 

100

(ADJUSTMENT DATA) 3.RRCA 

50

   4.RRCB 

50 

10.SIDE2 ADJ. 

50

(IMAGE LOSS SETTING) 5.LEAD 

15

 6.SIDE 

20

(VOID SETTING) 7.LEAD_EDGE(DENA) 

50

               8.TRAIL_EDGE(DENB)

30

  9.FRONT/REAR 

30

Print
lead edge

Fixing screw
(M4 x 8)

A

B

First copy image

First copy image

Image

Image

Paper

Paper

Difference

Difference