AR-M550 (serv.man12). (6b) Laser scan unit, Image process section, Scanner section, Fusing section, SPF section - Sharp Copying Equipment Service Manual (repair manual). Page 67

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AR-M550/M620  DETAILS OF EACH SECTION  6 - 126
[Paper exit section]
A. Major parts and signal functions
B. Operational descriptions
(1) Document feed, transport, scan, paper exit, and 
operating speed
The document fed by the take-up roller is sent through the paper feed
roller and the transport roller to the resist roller section.
In the resist roller section, the document lead edge and the scan start
position are synchronized. The document is transported to the scan
section. After being scanned, the document discharged to the docu-
ment exit tray by the paper exit roller.
The document transport speed varies depending on the scan mode
and the scan magnification ratio as shown below. 
Code
Signal 
name
Name
Function/Operation
Type
Model
Note
SOCD
SOCD
SPF open/close detector
SPF unit open/close detection
Transmission type
Sensor
SPOD
SPOD
SPF paper exit detector
SPF paper exit detection
Transmission type
Sensor
SPPD3
SPPD3
SPF document paper pass detector 3
SPF document paper pass detection 3
Transmission type
Sensor
SPPD4
SPPD4
SPF document paper pass detector 4
SPF document paper pass detection 4
Transmission type
Sensor
SRRC
SRRC
SPF No. 2 resist clutch
SPF transport roller 3 ON/OFF control
Electromagnetic clutch
SRRBC
SRRBC
SPF No. 2 resist roller brake clutch
SPF transport roller 3 braking
Electromagnetic clutch
SPSM
LSPFH2
SPF paper exit motor
Drives the paper exit roller. (SPF)
Stepping motor
1
1
3
2
SPOD
5VPOD
5V2
GND
3
SOCD
B3B-PH-K-S
2
GND
B3B-PH-K-S
5V2
SPED2
10
1
3
3
SPPD3
3
9
7
2
5
B3B-PH-K-S
8
12
SPPD4
1
SPPD4
2
4
2
11
STLD
6
B3B-PH-K-S
GND
SPPD3
1
25
12
30
10
CN3
2
27
26
18
22
29
3
13
5
17
9
20
14
19
1
6
16
11
7
15
4
8
23
28
21
B34B-PHDSS-B
24
5V2
GND
GND
5V2
GND
5V2
GND
5V2
GND
1
2
3
4
5
6
12
11
10
9
8
7
SMP-12V-NC
SMR-12V-N
5V1
34
31
33
32
GND
GND
OUT SLUMA
/SRRBC
24V3 PM
24V3 SRRBC
GND
GND
GND
GND
OUT /SLUMA
24V3 STRC
N.C
5V2
GND
5VPOD
24V3 SRRC
5V2
VAREF
N.C
/SRRC
/STRBC
GND
5V2
5V2
OUT SLUMB
GND
/STRC
OUT /SLUMB
GND
5V2
5V2
24V3 STRBC
24V3 FAN
5V2
S22B-PHDSS-B
CN12
CN11
S20B-PHDSS-B
/SPFMA1
/SPFMB1
B12B-PH-K-S
SPFMB1
/SPFMA2
SPFMA1
SPFMA2
24V3
SPFMB2
24V3
24V3
/SPFMB2
CN1
24V3
11
1
2
3
4
5
6
7
8
9
10
STRC
SPFC
SRRC
SPFFAN
STRBC
SRRBC
SPF SET
/SLUMB
SLUMA
SLUMB
/SLUMA
SPWS
STLD
SPPD3
SPOD
SPED2
SPPD4
SOCD
SPLS1
SPLS2
17
16
18
12
13
15
14
19
20
B5B-PH-K-S
N.C
2
3
1
4
5
CN6
CN2
B32B-PHDSS-B
12
18
1
8
14
13
5
9
3
4
2
6
16
7
17
20
19
15
10
11
9
19
6
3
18
21
15
2
14
11
22
8
4
1
17
12
16
20
7
5
13
10
11
10
12
9
7
8
5
4
3
1
6
2
/SPFMB2
SPFMB2
24V3
24V3
SPFMA2
/SPFMA2
1
6
4
5
3
2
1
6
4
5
3
2
SMR-06V-B
SMP-06V-BC
21
22
23
24
25
26
27
28
29
30
32
31
24V3
24V3
SPFMO2
SPFMO1
GND
GND
STUD
SPED1
SPPD1
SCOV
VAREF
SPPD2
GND
5V2
GND
N.C
/SPFMA
SPFMA
/SPFMB
SPFMB
STRC
SPFC
SRRC
STRBC
SRRBC
SPF SET
/SLUMA
/SLUMB
SLUMA
SLUMB
STRRBC
STRRC
STRRC
STRRBC
5V2
24V3
/SPFMB
GND
SPED1
STUD
24V3
/SPFMA
SCOV
SPPD1
SPFMO2
SPFMO1
SPFMB
VAREF
GND
SPFMA
SPPD2
GND
GND
24V3
/STRRC
24V3
/STRRBC
1
/STRRC
2
24V3
PHNR-2-H
+BU2P-TR-P-H
24V3
PHNR-3-H
+BU3P-TR-P-H
3
1
/STRRBC
N.C
2
PHNR-2-H
PHNR-3-H
1
2
1
2
3
5V1
SCN cnt PWB
FFC-35Pin
12V2
24V3
RXD_CCD2
TXD_CCD2
CLK_CCD2
3.3V3
GND
FRM_CCD2
GND
PAGE2
ADD_CCD2
S26B-PHDSS-B
/CISSET
CN10
GND
GND
5V2
3.3V3
20
24
18
17
15
10
21
23
13
19
12
11
14
16
22
25
26
5V2
2_DATA1+
2_DATA0-
2_DATA0+
2_DATA1-
2_CLK-
2_CLK+
/2_DBL-
/2_DBL+
RES_CCD2
9
1
7
5
4
6
8
2
3
SPF PWB
STRRC
SPPD3
SPPD4
SOCD
SPOD
STRRBC
SPSM
Scan mode
Magnification ratio
Document transport 
speed
Single surface scan
Up to 117%
360mm/sec
Single surface scan
118% or above
220mm/sec
Duplex scan
Up to 100%
220mm/sec
Duplex scan
101% or above
110mm/sec
Display
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