Read Sharp AL-840 (serv.man6) Service Manual online
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Troubles caused by improper work
1) Scanner motor trouble
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After-work
JOB No.
Content
ADJ M2/ADJ 2
Sub scanning direction copy distortion
adjustment
adjustment
ADJ 2
Sub scanning direction distortion
adjustment
adjustment
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Location
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Adjustment value
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Execution condition (time)
Enforcement
time
time
JOB No
Content
S 004
When any part in the scanner
(reading) section is
disassembled or replaced.
(reading) section is
disassembled or replaced.
ADJ M2/
ADJ 1
ADJ 1
When the scanner unit
parallelism adjustment is
performed.
parallelism adjustment is
performed.
Cycle
—
Condition
When the copy image
distortion is outside the
specified range.
distortion is outside the
specified range.
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Necessary condition
1) The scanner unit parallelism adjustment (mechanical adjustment)
is completed.
2) The scanner drive wire tension is proper.
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Work content
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.
ADJ M2/ADJ1
203mm
203mm
D
D
D 1.0mm
L=10mm
L
L
L
L
A6
B6
51/2
A5
B5
81/2
A4
30mm
Test chart
7 – 5
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