Read Sharp AL-840 (serv.man6) Service Manual online
11) Place a white paper (A4, 11"
×
8.5") at a slightely shifted position
to the left of the scale.
12) Select the adjustment mode rear edge void area with the copy
picture quality mode select key.
(The currently set adjustment value is displayed on the copy
quantity display.)
quantity display.)
13) Press the start button. (Make a copy with the document cover
open.)
(A copy is made.)
14) Measure the rear edge void area.
If the distance between the paper rear edge and the copy image
rear edge is not 2.5
rear edge is not 2.5
±
1.5mm, change the set value and press the
start button.
The adjustment value can be set in the range of 0
∼
99.
(Note)
Use SIM 50-10 to adjust the main scanning direction image posi-
tion
tion
*
Troubles caused by improper work
1) If the void area is less than the specified level, the transfer roller,
the fusing roller, the separation pawl, and the paper trnsport sec-
tion are dirtied with toner.
tion are dirtied with toner.
As a result, print paper is dirtied and paper jams are generated.
*
Necessary tools
Name
Scale
Parts code/Price rank
—
ADJ 2
Void area (left/right) adjustment
*
Adjustment value
(Simulation adjustment value)
Left void area
Right void area
Range (MIN)
0
0
Range (MAX)
99
99
Standard value
50
50
Default
50
50
(Image loss, void area djustment)
Left void area
Right void area
Range (MIN)
1.0mm
1.0mm
Range (MAX)
3.0mm
3.0mm
Standard value
2.0mm
2.0mm
*
Program used
Test command (Simulation)
MODE
Normal
MAIN CODE
50
SUB CODE
10
*
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.
S 009/Ua 002
When the MCU PWB is
replaced.
In case of U2 trouble
replaced.
In case of U2 trouble
Cycle
—
Conditions
When the copy image area
(image loss, void area) is not
within the specified range.
(image loss, void area) is not
within the specified range.
*
Necessary condition
1) The copy magnification ratio is within the specified range.
2) The copy distortion is within the specified range.
*
Work content
1) Make a test chart as shown below.
2) Enter the SIM 50-10 mode.
3) Set the test chart made in procedure 1) on the document table.
4) Make a copy and measure the left and the right void areas.
(Measure the distance from the left/right edge to the image lead
edge.)
edge.)
If the void area is not within the specified range, perform the
following procdure.
following procdure.
Standard value: 2.0
+
1.0
−
0.5
mm
A6
B6
51/2
A5
B5
81/2
A4
White paper (A4, 11" x 8.5")
(Slightly shifted to the left.)
(Slightly shifted to the left.)
2.5mm
Paper rear edge
Black background
section
section
Void area
Draw a line.
A4 (11" x 8.5")
paper
paper
Paper edges
Right void area
Line image
lead edge
lead edge
Left void area
7 – 13
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