DOWNLOAD Sharp AR-M256 (serv.man11) Service Manual ↓ Size: 14.14 MB | Pages: 127 in PDF or view online for FREE

AR-M256/M257/M258/M316/M317/M318/5625/5631  ADJUSTMENTS, SETTING 7 - 5

1) Remove the OC glass, the right cabinet and the upper right side

cover.

2) Loosen the copy lamp unit wire fixing screw.

3) Manually turn the mirror base drive pulley and bring No. 2/3 mirror

base unit into contact with the positioning plate.

At that time, if the front frame side and the rear frame side of No. 2/
3 mirror base unit are brought into contact with the positioning
plate at the same time, the mirror base unit parallelism is proper.

If one of them is in contact with the positioning plate, perform the
adjustment of 4).

4) Loosen the set screw of the scanner drive pulley which is not in

contact with No. 2/3 mirror base unit positioning plate.

5) Without moving the scanner drive pulley shaft, manually turn the

scanner drive pulley until the positioning plate is brought into con-
tact with No. 2/3 mirror base unit, then fix the scanner drive pulley.

6) Put No. 2/3 mirror base unit on the positioning plate again, push

the projections on the front frame side and the rear frame side of
the copy lamp unit to the corner frame, and tighten the wire fixing
screw.

Adjustment 

mode

SIM

Set value

Spec 

value

Setting 

range

Left edge void

50-1

-8

1 step: 0.127mm 
shift

0.5 – 4mm

1 – 99

Wire fixing screw

AR-M256/M257/M258/M316/M317/M318/5625/5631  ADJUSTMENTS, SETTING 7 - 6

This adjustment must be performed in the following cases:

• When the mirror base drive wire is replaced.

• When the lamp unit, or No. 2/3 mirror holder is replaced.

• When a copy as shown is made.

1) Set A3 (11" x 17") white paper on the original table as shown

below.

2) Open the original cover and make a normal (100%) copy.

3) Measure the width of the black background at the lead edge and at

the rear edge.

If the width (La) of the black background at the lead edge is equal
that (Lb) at the rear edge, there is no need to execute the following
procedures of 4) – 7).

4) Loosen the mirror base drive pulley fixing screw on the front frame

side or on the rear frame side.

5) Tighten the fixing screw of the mirror base drive pulley.

La = Lb

6) Execute the main scanning direction (FR) distortion balance

adjustment previously described in 2) again.

When there is no skew copy in the mirror base scanning direction and
there is no horizontal error (right angle to the scanning direction), the
adjustment can be made by adjusting the No. 2/3 mirror base unit rail
height.

Before performing this adjustment, be sure to perform the horizontal
image distortion adjustment in the laser scanner section.

This adjustment must be performed in the following cases:

• When the mirror base wire is replaced.

• When the copy lamp unit and no. 2/3 mirror unit are replaced.

• When the mirror unit rail is replaced and moved.

• When a following copy is made.

1) Make an original for the adjustment.

Make test sheet by drawing parallel lines at 10mm from the both
ends of A3 (11" x 17") white paper as shown below. (These lines
must be correctly parallel to each other.)

2) Make a normal (100%) copy of the test sheet on A3 (11" x 17")

paper. (Fit the paper edge and the glass holding plate edge.)

Lb

La

Original

Copy

Paper exit 
direction

Place a little clearance from 
the rear side original guide.

Glass holding plate

A3 (11" x 17") white paper

Fit the paper edge and 
the glass holding plate edge.

Paper exit direction

La: Lead edge black background width
Lb: Rear edge black background width

• When La < Lb

Turn the mirror base drive pulley on the front frame side in the
arrow direction A. (Do not move the mirror base drive pulley shaft.)

• When La > Lb

Turn the mirror base drive pulley on the rear frame side in the
arrow direction A. (Do not move the mirror base drive pulley shaft.)

A

B

Rear side

Front side

Original

Copy A

Copy B

10mm

10mm

10mm

10mm

Parallel line

Parallel line

White paper

AR-M256/M257/M258/M316/M317/M318/5625/5631  ADJUSTMENTS, SETTING 7 - 7

3) Measure the distances (La, Lb, Lc, Ld) at the four corners as

shown below.

When La = Lb and Lc = Ld, no need to perform the procedures 4)
and 5).

4) Move the mirror base B rail position up and down (in the arrow

direction) to adjust.

La = Lb, Lc = Ld

5) After completion of adjustment, manually turn the mirror base drive

pulley, scan the mirror base A and mirror base B fully, and check
that the mirror bases are not in contact with each other.

∗

If the mirror base rail is moved extremely, the mirror base may be in
contact with the frame or the original glass. Be careful to avoid this.

Note: Before performing this adjustment, be sure to check that the

CCD unit is properly installed.

1) Put a scale on the original table as shown below.

2) Execute SIM 48-1.

3) After warm-up, shading is performed and the current set value of

the main scanning direction magnification ratio is displayed on the
display section in 2 digits.

4) Manual correction mode (SIM48-1-1)

Enter the set value and press the start key.

The correction value is stored and a copy is made.

<Adjustment specification>
Note: A judgment must be made with 200mm width, and must not be

made with 100mm width.

Note: Execute the procedure after completion of SIM 48-1-1.

1) Put a scale on the original table as shown below, and make a nor-

mal (100%) copy.

2) Compare the scale image and the actual scale.

If necessary, perform the following adjustment procedures.

3) Execute SIM 48-1-2.

4) Enter the set value and press the start key.

The set value is stored and a copy is made.

Note: Before performing this adjustment, be sure to check that the

CCD unit is properly installed and that OC mode adjustment in
copying has been completed.

• When La > Lb

Shift the mirror base B rail upward by the half of the difference of
La–Lb.

• When La < Lb

Shift the mirror base B rail downward by the half of the difference
of Lb–La.

Example: When La = 12mm and Lb = 9mm, shift the mirror base

B rail upward by 1.5mm.

• When Lc >Ld

Shift the mirror base B rail downward by the half of the difference
of Lc–Ld.

• When Lc < Ld

When Lc < Ld, move the mirror base B on the paper feed side
upward.

∗

When moving the mirror base rail, hold the mirror base rail with
your hand.

La

Lb

Ld

Lc

Paper exit
direction

Adjustment 

mode

Spec value

SIM

Set value

Setting 

range

Main scanning 
direction 
magnification 
ratio

At normal: 
±1.0%

48-
1-1

Add 1: 0.1% 
increase
Reduce 1: 0.1% 
decrease

1 – 99

Adjustment 

mode

Spec value

SIM

Set value

Setting 

range

Sub scanning 
direction 
magnification 
ratio (OC mode)

At normal: 
±1.0%

48-1-

2

Add 1: 
0.05% increase
Reduce 1: 
0.05% decrease

1 – 99

AR-M256/M257/M258/M316/M317/M318/5625/5631  ADJUSTMENTS, SETTING 7 - 8

1) Put a scale on the original table as shown below, and make a nor-

mal (100%) copy to make a test chart.

Note: Since the printed copy is used as a test chart, put the scale in

parallel with the front side edge of the glass.

2) Set the test chart on the RSPF and make a normal (100%) copy.

3) Compare the scale image and the actual image.

If necessary, perform the following adjustment procedures.

4) Execute SIM 48-1-3.

5) After warm-up, shading is performed.

The current front surface sub scanning direction magnification ratio
correction value is displayed in two digits on the display section.

6) Enter the set value and press the start key.

The set value is stored and a copy is made.

7) Execute SIM 48-1-4.

The current back surface sub scanning direction magnification ratio
is displayed in two digits on the display section.

8) Enter the set value and press the start key.

The set value is stored and a copy is made.

Note: Before performing this adjustment, be sure to check that the

paper off center is properly adjusted.

1) Place the center position adjustment test chart (sheet with a

straight line in the scan direction at the center) on the RSPF.

2) Make a normal copy from the manual paper feed tray, and check

the printed copy with the test chart.

If any adjustment is required, perform the following procedure. 

3) Execute SIM 50-12.

4) After warm-up, shading is performed and the current set value of

the off center adjustment is displayed on the display section in 2
digits.

5) Enter the set value and press the start key.

The set value is stored and a copy is made.

1) Execute SIM 41-3.

2) Gradually close the OC (RSPF) from the full open position, and

measure distance A when the display on the operation panel
changes. (See the figure below.)

Distance A = Table glass top - OC (RSPF) handle rib

OC (SPF) open/close position A: 125 – 225mm

3) If the distance is outside the specified range, adjust the open/close

sensor attachment plate position as shown below.

1) Set A3 (11" x 17") paper on the OC table.

(Keep the SPF (OC cover) open.)

2) Execute SIM 41-2.

3) Keep A=125mm, and execute SIM 41-4. (Do not put paper on the

table.)

4) Check the reaction with SIM 41-1. 

Adjustment mode

Spec 

value

SIM

Set value

Setting 

range

Sub scanning 
direction 
magnification ratio 
(RSPF mode)

At normal: 
±1.0%

48-1-3
48-1-4

Add 1: 
0.05% increase

Reduce 1: 
0.05% decrease

1 – 99

Adjustment 

mode

Spec value

SIM

Set value

Setting 

range

Original off 
center mode 
(RSPF 
mode)

Single: Center 
± 3.0mm

50-12

Add 1: 0.1mm 
shift to R side

1 – 99

Duplex: Center 
±3.5mm

Reduce 1: 0.1mm 
shift to L side

･

Distance < 125mm: Shift toward A.

･

Distance > 225mm: Shift toward B.

A