AL-840 (serv.man6). AL800 840 Service Manual-Adjustments - Sharp Copying Equipment Service Manual (repair manual). Page 6

3) Check the sub scanning direction distortion.

If La = Lb, there is no distortion.

If there is any distortion in the sub scanning direction, perform the
following procedures.

4) Loosen either one of the two fixing screws of the scanner unit

drive pulley.

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

scanner unit drive pulley to adjust the parallelism of the scanner
unit A. (Change the relative positions of the scanner unit drive
pulley and the drive shaft.)

6) Tighten the scanner unit drive pulley fixing screw.

Repeat procedures 2) 

∼

 6) until the condition of procedure 3) is

satisfied.

*

JOB No.

Content

ADJ M2/ADJ 1

Scanner unit parallelism adjustment
(mechanical adjustment)

*

JOB No.

Content

ADJ M2/ADJ 3

Main scanning direction copy distortion
adjustment

*

Name

Scale

Parts code/Price rank

—

*

*

*

Enforcement
time

JOB No

Content

S 004

When any part in the scanner
(reading) section is
disassembled or replaced.

ADJ M2/
ADJ 2

When the sub scanning
direction distortion is
performed.

Cycle

—

Condition

When the copy image
distortion is not within the
specified range.

*

1) The scanner unit parallelism adjustment (mechanical adjustment)

is completed.

2) The scanner drive wire tension is proper.

3) The sub scanning direction copy distortion is within the specified

range.

*

1) Make a test chart on A4 (11" 

×

 8.5") paper as shown below. (Draw

a rectangular with four right angles.)

2) Set the test chart which was made in procedure 1) on the docu-

ment table, and make a copy on A4 (11" 

×

 8.5") paper with the

document cover open.

La

Lb

ADJM2/ADJ3

203mm

203mm

D

D

D    1.0mm

L=10mm

L

L

L

L

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