Sharp AR-C172M (serv.man4) Service Manual ▷ View online
AR-C172M SETTING AND ADJUSTMENTS 8 - 12
3) When Y < 0, and X
≥
0:
B = A + (X – 20) + Y = 48 + (7 – 20) + (– 20) = 15
4) When Y < 0, and X < 0:
B = A + X + Y = 48 + (– 5) + (– 20) = 23
Sub scanning direction image position/print area adjustment (Print engine section)
(1) How to read the fine adjustment pattern
The highest-density area of the color is regarded as the center and as the reading value of the shift amount.
(The reading value in the figure below is 4.)
(The reading value in the figure below is 4.)
(2) How to read the rough adjustment pattern
Judge the polarity by checking that the color line is shifted to the positive or the negative side.
The scales are made with the black line at the center as 0, the first mark as 20, the second mark as 40, and the third mark as 60.
The interval between rough adjustment marks is 20.
(For an example shown in the figure below, it is between 20 and 40 on the positive side. Therefore, the reading value is 20.)
(For an example shown in the figure below, it is between 20 and 40 on the positive side. Therefore, the reading value is 20.)
(Example)
(3) How to calculate the adjustment value
New adjustment value = Current adjustment value + Rough
adjustment pattern reading value + Fine adjustment pattern read-
ing value
adjustment pattern reading value + Fine adjustment pattern read-
ing value
A: Current adjustment value
B: New adjustment value
X: Fine adjustment pattern reading value
Y: Rough adjustment pattern reading value
The polarity of the calculation differs depending on the polarity of
the adjustment pattern reading values. There are following four
cases:
the adjustment pattern reading values. There are following four
cases:
1) When Y
≥
0, and X
≥
0:
B = A + X + Y
2) When Y
≥
0, and X < 0:
B = A + (X + 20) + Y
3) When Y < 0, and X
≥
0:
B = A + (X – 20) + Y
4) When Y < 0, and X < 0:
B = A + X + Y
9
8
7
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
60
-60
9
8
7
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
60
-60
9
8
7
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
Target adjustment range
(–2 to 2)
60
-60
First mark
Second mark
Third mark
First mark
Second mark
Third mark
AR-C172M SETTING AND ADJUSTMENTS 8 - 13
Example
A: Providing that Current adjustment value = 48:
1) When Y
≥
0, and X
≥
0:
B = A + X + Y = 48 + (4) + (20) = 72
2) When Y
≥
0, and X < 0:
B = A + (X + 20) + Y = 48 + (–6 + 20) + (20) = 82
3) When Y < 0, and X
≥
0:
B = A + (X – 20) + Y = 48 + (7 – 20) + (– 20) = 15
4) When Y < 0, and X < 0:
B = A + X + Y = 48 + (– 5) + (– 20) = 23
9
8
7
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
60
-60
9
8
7
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
60
-60
9
8
7
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
60
-60
9
8
7
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
60
-60
AR-C172M SETTING AND ADJUSTMENTS 8 - 14
This adjustment must be performed in the following cases:
• When the paper tray is replaced.
• When the paper tray section is disassembled.
• When the manual paper feed tray is replaced.
• When the manual paper feed tray is disassembled.
• When the duplex section is disassembled.
• When the duplex section is installed or replaced.
• When the large capacity paper feed tray is installed or replaced.
• When the large capacity paper feed tray is disassembled.
• When a U2 trouble occurs.
• When the ICU main PWB is replaced.
• When the EEPROM of the ICU main PWB is replaced.
1) Enter the SIM 50-10 mode.
2) Select the paper feed mode to be adjusted with the scroll key.
3) Press the [EXECUTE] key.
The adjustment pattern is printed.
4) Check the adjustment pattern image position.
Measure the sizes of the void area on the front and the back
edges of the adjustment pattern, and check that the following
conditions are satisfied.
edges of the adjustment pattern, and check that the following
conditions are satisfied.
If A – B = 0 ± 4.0mm, there is no need to adjust.
If the above condition is not satisfied, perform the following
procedure.
procedure.
5) Change the adjustment value.
(Enter the adjustment value and press the [OK] key.)
When the adjustment value is increased, the image is shifted
backward.
backward.
When the adjustment value is decreased, the image is shifted
forward.
forward.
A change in the set value by 1 corresponds to a change in the
shift by about 0.1mm.
shift by about 0.1mm.
Repeat procedures 3) – 5) until the condition of procedure 4)
is satisfied.
is satisfied.
If the above procedure does not satisfy the condition of 4),
perform the following procedure.
perform the following procedure.
6) Loosen the paper feed tray cover fixing screw, and shift the
installing position in the arrow direction.
Perform procedures from 2) again.
Perform the above procedures for all paper feed units.
This adjustment must be performed in the following cases:
• When a U2 trouble occurs.
• When the ICU PWB is replaced.
• When the EEPROM of the ICU PWB is replaced.
1) Enter the SIM 50-5 mode.
2) Select the paper feed mode with the scroll key.
3) Press the [EXECUTE] key.
The adjustment pattern is printed.
4) Check the adjustment pattern image position.
Measure the sizes of the void area on the left and the right
edges of the adjustment pattern, and check that the following
conditions are satisfied.
edges of the adjustment pattern, and check that the following
conditions are satisfied.
If A = 4.0 ± 2.0mm and B = 4.0 ± 2.0mm, the adjustment is not
required.
required.
If the above condition is not satisfied, perform the following
procedure.
procedure.
5) Change the adjustment values of item A (DEN-C) and B
(DEN-B), and press the [EXECUTE] key.
When the adjustment value of item A (DEN-C) is decreased by
1, the print start position in the sub scanning direction is
shifted to the paper lead edge by 0.125mm.
1, the print start position in the sub scanning direction is
shifted to the paper lead edge by 0.125mm.
When the adjustment value of item B (DEN-B) is decreased by
1, the print start position in the sub scanning direction is
shifted to the paper rear edge by 0.125mm.
1, the print start position in the sub scanning direction is
shifted to the paper rear edge by 0.125mm.
Repeat procedures 3) – 5) until the condition of procedure 4)
is satisfied.
is satisfied.
ADJ 5
Image position/print area adjustment (Print engine section)
ADJ 5A
Main scanning direction image
position adjustment (Print engine
section)
position adjustment (Print engine
section)
B
A
A–B = 0 4.0mm
+
-
ADJ 5B
Sub scanning direction image
position/print area adjustment
(Print engine section)
position/print area adjustment
(Print engine section)
Paper feed tray cover
fixing screw
fixing screw
Paper feed tray cover
fixing screw
fixing screw
A
A = 4.0 2.0mm
+
-
B = 4.0 2.0mm
+
-
B
AR-C172M SETTING AND ADJUSTMENTS 8 - 15
This adjustment must be performed in the following cases:
• When the scanner (reading) section is disassembled.
• When a copy image distortion occurs.
1) Loosen the screw that is fixing the scanner unit A and the drive
wire, and remove the scanner unit A from the drive wire.
2) Manually turn the scanner drive pulley to bring the scanner
unit B into contact with the stopper.
At that time, if the scanner unit B makes contact with the two
stoppers on the front and the rear frame simultaneously, the
parallelism of the scanner unit B is proper.
stoppers on the front and the rear frame simultaneously, the
parallelism of the scanner unit B is proper.
If not, perform the following procedures.
3) Loosen the pulley angle fixing screw on the front frame side of
the scanner unit B.
4) Adjust the pulley angle position on the scanner unit B front
frame side so that both stoppers on the front frame and the
rear frame are in contact with the scanner unit B at the same
time.
rear frame are in contact with the scanner unit B at the same
time.
5) Fix the pulley angle on the scanner unit B front frame side.
If the above procedure does not result in a satisfactory result,
perform the following procedure.
perform the following procedure.
Loosen the fixing screw of the scanner unit drive pulley that is
not in contact.
not in contact.
Without moving the scanner unit drive shaft, manually turn the
scanner unit drive pulley so that the scanner unit B is brought
into contact with the stopper on the front frame side and the
stopper on the rear frame side at the same time. (Change the
relative positions of the scanner unit drive pulley and the drive
shaft.)
scanner unit drive pulley so that the scanner unit B is brought
into contact with the stopper on the front frame side and the
stopper on the rear frame side at the same time. (Change the
relative positions of the scanner unit drive pulley and the drive
shaft.)
Fix the scanner unit drive pulley fixing screw.
ADJ 6
Copy image distortion
adjustment
adjustment
ADJ 6A
Scanner (reading) unit parallelism
adjustment
adjustment
Scanner unit B
Winding pulley
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