Sharp AR-SP4 Service Manual ▷ View online
[4] EXTERNAL VIEW AND INTERNAL STRUCTURE
1. External view
No.
Name
No.
Name
No.
Name
1
Document set tray
2
Document guide
3
Document feed section cover
4
Document transport section cover
5
Document exit section
2. Internal structure
Sensors and detectors
No.
Code
Name
Type
Function, operation
1
W0
Document set sensor
Photo transmission
Document presence detection
2
COVER
Open/close sensor
Photo transmission
Paper feed unit open/close detection
3
W1
Document sensor (A4R, LTR, A5)
Photo transmission
Tray document width detection
4
W2
Document width sensor (B4R, B5)
Photo transmission
Tray document width detection
5
W3
Document width sensor (WLTR, A5R, A4, LT)
Photo transmission
Tray document width detection
6
PSOL
Pickup solenoid
—
—
7
PAPER
Paper entry sensor
Photo transmission
Document presence detection
9
CLH
Transport clutch
—
—
10
MOT
SPF motor
Stepping motor
Tray paper feed, transport, paper exit roller drive
12
—
Interface PWB
—
SPF control and communication with the copier body
13
L1
Document length detection SW (Short)
Photo transmission
Tray document length detection
14
L2
Document length detection SW (Long)
Photo transmission
Tray document length detection
15
COVER OPEN
Book sensor
Photo transmission
Detects SPF floating.
16
PO
Paper exit sensor
Photo transmission
Detects transport of document.
1
2
3
4
5
1
2
3
4
5
6
7
9
10
12
13
14
15
16
[5] OPEREATIONAL DESCRIPTIONS
1. Paper feed section major parts
No.
Part name
Operation
1
Document length
sensor (L2)
sensor (L2)
Detects the document length on
the tray.
the tray.
2
Document length
sensor (L1)
sensor (L1)
Detects the document length on
the tray.
the tray.
3
Document length
sensor (W0)
sensor (W0)
Detects the presence of document.
4
Document width sensor
(W1, W2, W3)
(W1, W2, W3)
Detects the document width.
5
Pickup roller
Picks up the document.
6
Paper feed roller
Feed and transport the document.
7
Paper entry sensor
(PAPER)
(PAPER)
Detects the document transport.
8
PS roller
Makes synchronization between
the document lead edge and the
image lead edge.
the document lead edge and the
image lead edge.
9
PS follower roller
Makes synchronization between
the document lead edge and the
image lead edge.
the document lead edge and the
image lead edge.
10
Transport roller
Transports the document.
11
Transport follower roller
Transports the document.
12
Paper exit sensor
Detects transport of documents.
13
Paper exit follower roller
Discharges the document.
14
Paper exit roller
Discharges the document.
2. Brief descriptions of operations
3. Document size detection
Document size detection by document set tray
When a document is set on the document set tray in the auto mode of
paper/copy magnification ratio selection, the document size is de-
tected to perform the auto selection function of paper and the copy
magnification ratio according to the detected document size.
paper/copy magnification ratio selection, the document size is de-
tected to perform the auto selection function of paper and the copy
magnification ratio according to the detected document size.
When documents of different sizes are mixed and set on the tray, the
max. size is detected. The document width is detected by the docu-
ment width sensors (W1, W2, W3), and the document length is de-
tected by the document length sensors (L1, L2) to determine the
document size.
max. size is detected. The document width is detected by the docu-
ment width sensors (W1, W2, W3), and the document length is de-
tected by the document length sensors (L1, L2) to determine the
document size.
The document size judgment is made after a certain time from when
the document set sensor (W0) detects the document.
the document set sensor (W0) detects the document.
Document size
and set direction
Document width sensor
Document
length sensor
W1
W2
W3
L1
L2
AB
series
A5
B5
A5R
A4
B5R
A4R
8.5" x 13"
B4
A3
Inch
series
8.5" x 5.5"
8.5" x 5.5"R
11" x 8.5"
11" x 8.5"R
8.5" x 13"
8.5" x 14"
11" x 17"
[Note] Sensor ON: , OFF:
1
2
3,4 5
6
8
9
10
11
12
13
7
1) Document set (Document set sensor ON)
3) Copy start (Machine)
4) SPF motor ON
5) Pickup solenoid ON
6) Pickup roller and paper feed roller rotation
7) Paper entry sensor detects paper presence.
8) PS roller rotation
9) Copy operation ( Machine)
10) Transport roller rotation
11) Paper exit roller rotation
12) Document exit
YES
13) Next document
NO
2)
14) SPF motor OFF
Document size detection (The document width is detected with
document width sensors W1, W2, and W3, and the document length is
detected with document length sensors L1 and L2.)
document width sensors W1, W2, and W3, and the document length is
detected with document length sensors L1 and L2.)
[6] ADJUSTMENTS
(1) SPF auto white correction pixel adjustment
[Function]
The SPF white correction start pixel position is automatically adjusted.
This adjustment is performed after the lens unit is replaced.
This adjustment is performed after the lens unit is replaced.
(2) RSPF magnification ratio adjustment
Note : When performing this adjustment, check that the CCD unit
is properly installed.
: When performing this adjustment, check that the OC mode
adjustment in copying is completed.
1) Place a scale on the document table as shown below, and make a
normal copy to make a test chart.
2) Set the test chart to the SPF and make a normal copy.
3) Compare the copy and the test chart.
If an adjustment is needed, perform the following procedures.
4) Execute SIM 8-1. The auto exposure lamp lights up.
5) The current correction value is displayed on the display section in
two digits.
6) Enter the set value, and press the START key.
The entered correction value is stored and a copy is made.
7) Change the duplex document mode to the simplex document
mode.
The MANUAL lamp lights up, and the current correction value of
the back surface sub scanning direction magnification ratio is dis-
played on the display section in two digits.
The MANUAL lamp lights up, and the current correction value of
the back surface sub scanning direction magnification ratio is dis-
played on the display section in two digits.
8) Enter the set value, and press the SATART key.
The entered correction value is stored and a copy is made.
<Adjustment specifications>
Mode
Spec
SIM
Set value
Set range
Magnification ratio adjustment
Normal:
±
1.0%
SIM 48-1
4: SPF surface magnification ratio adjustment
5: SPF back magnification ratio adjustment
5: SPF back magnification ratio adjustment
Add 1:
0.1% increase
Reduce 1: 0.1% decrease
1 ~ 99
(3) SPF document off center adjustment
Note : When performing this adjustment, check that the paper off-
center is properly adjusted.
1) Set the center position adjustment test chart (made by yourself) on
the RSPF.
<Adjustment specifications>
Draw a line in the center of paper. (In the scanning direction)
2) Make a normal copy from the manual feed tray, and compare the
copy and the test chart.
If an adjustment is required, perform the following procedures.
If an adjustment is required, perform the following procedures.
3) Execute SIM 50-12.
4) The current off-center adjustment value is displayed on the display
section in two digits.
5) Enter the set value and press the START key.
The entered correction value is started and a copy is made.
<Adjustment specifications>
Mode
Specification
SIM
Set value
Set range
Document off-center (SPF mode)
Simplex: Center
±
3.0mm
Duplex: Center
±
3.5mm
SIM 50-12
2: SPF surface
3: SPF back
3: SPF back
Add 1:
0.1mm shifted to R side.
Reduce 1: 0.1mm shifted to L side.
1 ~ 99
Sim63-7 SPF ADJ.
WHITE ADJUST
PRESS OK KEY
EXEC
Sim63-7 SPF ADJ.
WHITE ADJUST
EXEC
Sim63-7 SPF ADJ.
WHITE ADJUST
CPMPLETE
[160]
PRESS OK KEY
EXEC
Sim63-7 SPF ADJ.
WHITE ADJUST
ERROR
[ 0]
PRESS OK KEY
EXEC
Press
the [OK] key.
Press
the [RETURN] key.
[Operation]
(Initial screen)
(During execution)
(Initial screen with the execution result displayed)
Normal end
Abnormal end
During execution,
"EXEC" is highlighted.
"EXEC" is highlighted.
Open the SPF unit and press the [OK] key.
[ ] indicates the order number of the pixel of the white
sheet for SPF exposure correction in the SPF position.
[ ] indicates the order number of the pixel of the white
sheet for SPF exposure correction in the SPF position.
W h e n t h e a d j u s t m e n t i s c o m p l e t e d n o r m a l l y ,
"COMPLETE" is displayed, and data are written into the
EEPROM.
W h e n t h e a d j u s t m e n t i s c o m p l e t e d a b n o r m a l l y ,
"ERROR" is displayed and data are not written into the
EEPROM.
"COMPLETE" is displayed, and data are written into the
EEPROM.
W h e n t h e a d j u s t m e n t i s c o m p l e t e d a b n o r m a l l y ,
"ERROR" is displayed and data are not written into the
EEPROM.
The SPF white correction start pixel = Displayed
pixel position - 34
pixel position - 34
If the simulation is executed with the SPF unit
closed, an error is resulted.
closed, an error is resulted.
[CA] key: Cancels the test command.
[Interruption] key: Shifts to the sub code entry menu.
[OK] key: Shifts to the execution menu.
Interruption is inhibited during execution.
Note: Since the printed paper is used as the test chart,
place the scale in parallel to both sides.
place the scale in parallel to both sides.
(4) SPF image lead edge position adjustment
1) Set a scale on the OC table as shown below.
2) Make a copy, and use the copied paper as the document and
make a copy from SPF again.
3) Check the copied paper. If an adjustment is required, perform the
following procedures.
4) Execute SIM 50-6.
5) Set the SPF lead edge position set value (Exposure display
<MANUAL> ON) so that the image similar to the adjusted image at
the OC image lead edge position described previously is printed.
the OC image lead edge position described previously is printed.
<Adjustment specifications>
Adjustment mode
SIM
Set value
Specification
Set range
RSPF image lead edge
position
position
SIM 50-6
1: Surface document scan start position adjustment value
2: Back document scan start position adjustment value
3: Rear edge void adjustment value (SPF)
4: Surface image loss set value
5: Back image loss set value
6: Surface rear edge image loss set value
7: Back rear edge image loss set value
8: RRC cancel adjustment value (Back of the machine)
9: memory reverse position adjustment value
10: Duplex left edge void adjustment value
2: Back document scan start position adjustment value
3: Rear edge void adjustment value (SPF)
4: Surface image loss set value
5: Back image loss set value
6: Surface rear edge image loss set value
7: Back rear edge image loss set value
8: RRC cancel adjustment value (Back of the machine)
9: memory reverse position adjustment value
10: Duplex left edge void adjustment value
1step: 0.127mm shift
Lead edge void: 1 ~ 4mm
Image loss: 3mm or less
Image loss: 3mm or less
1 ~ 99
(5) SPF open/close detection position adjustment
(SIM 41-4)
1) Execute SIM 41-4.
2) Gradually close the SPF from the full open position, and measure
distance A when the display on the operation panel changes. (See
the figure below.)
the figure below.)
Distance A = Table glass top - SPF handle rib
<Spec value>
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.
·
Distance < 125mm: Shift toward A.
·
Distance > 225mm: Shift toward B.
Note: Since the printed paper is used as the test chart,
place the scale in parallel to both sides.
place the scale in parallel to both sides.
Sim41-4 20˚ SENSOR
OCSW
1[128]200 2[128]200
3[128]200 4[128]200
5[128]200
A
5
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