Sharp AR-M550 (serv.man11) Service Manual ▷ View online
AR-M550/M620 DETAILS OF EACH SECTION 6 - 21
Code
Signal
name
Name
Function/Operation
Type
Model
Note
M1LUD
M1LUD
Paper tray upper limit detector
(Paper feed tray 3)
(Paper feed tray 3)
Paper tray upper limit detection
(Paper feed tray 3)
(Paper feed tray 3)
Transmission
type
type
Paper feed tray system
sensor
sensor
M1PED
M1PED
Paper empty detector (Paper
feed tray 3)
feed tray 3)
Paper empty detection (Paper
feed tray 3)
feed tray 3)
Transmission
type
type
Paper feed tray system
sensor
sensor
M1PFD
M1PFD
Paper pass detector (Multi paper
feed tray 3)
feed tray 3)
Paper feed tray 3 paper pass
detection
detection
Transmission
type
type
Paper transport system
sensor
sensor
M1PWS
M1PWS
Paper feed tray paper width
detector (Paper feed tray 3)
detector (Paper feed tray 3)
Multi paper feed tray paper width
detection (Paper feed tray 3)
detection (Paper feed tray 3)
Slide resistor
Analog detector
M1SPD
M1SPD
Paper remaining quantity
detector (Paper feed tray 3)
detector (Paper feed tray 3)
Paper remaining quantity
detection (Multi paper feed tray 3)
detection (Multi paper feed tray 3)
Transmission
type
type
Paper feed tray remaining
quantity sensor
quantity sensor
M2LUD
M2LUD
Paper tray upper limit detector
(Paper feed tray 4)
(Paper feed tray 4)
Paper tray upper limit detection
(Paper feed tray 4)
(Paper feed tray 4)
Transmission
type
type
Paper feed tray system
sensor
sensor
M2PED
M2PED
Paper empty detector (Paper
feed tray 4)
feed tray 4)
Paper empty detection (Paper
feed tray 4)
feed tray 4)
Transmission
type
type
Paper feed tray system
sensor
sensor
M2PFD
M2PFD
Paper pass detector (Multi paper
feed tray 4)
feed tray 4)
Paper feed tray 4 paper pass
detection
detection
Transmission
type
type
Paper transport system
sensor
sensor
M2SPD
M2SPD
Paper remaining quantity
detector (Paper feed tray 4)
detector (Paper feed tray 4)
Paper remaining quantity
detection (Paper feed tray 4)
detection (Paper feed tray 4)
Transmission
type
type
Paper feed tray remaining
quantity sensor
quantity sensor
M1PFC
M1PFC
Paper feed clutch (Paper feed
tray 3)
tray 3)
Paper freed tray 3 section roller
ON/OFF control
ON/OFF control
Electromagnetic
clutch
clutch
M2PFC
M2PFC
Paper feed clutch (Paper feed
tray 4)
tray 4)
Paper freed tray 4 section roller
ON/OFF control
ON/OFF control
Electromagnetic
clutch
clutch
DSKPFC1
DSKPFC1 Paper feed tray 3/4 paper
transport clutch 1
Paper feed tray 3/4 section paper
transport roller ON/OFF control
transport roller ON/OFF control
Electromagnetic
clutch
clutch
M1PUS
M1PUS
Paper pickup solenoid (Paper
feed tray 3)
feed tray 3)
Presses the paper pickup roller
onto paper.
onto paper.
Electromagnetic
solenoid
solenoid
M2PUS
M2PUS
Paper pickup solenoid (Paper
feed tray 4)
feed tray 4)
Presses the paper pickup roller
onto paper.
onto paper.
Electromagnetic
solenoid
solenoid
MM
MM
Main motor
Drives the paper feed trays 1, 2, 3,
and 4, and the manual paper feed
section.
and 4, and the manual paper feed
section.
DC brushless
motor
motor
Paper pass
M2SS PWB
Paper size detection PWB
Paper size detection
No.
Name
Function
1
Paper size detection plate
Changes its own position in conjunction with the paper size (length) adjustment lever. By this
operation, the paper size detector detects the paper size.
operation, the paper size detector detects the paper size.
2
Paper widht guide R
Suppresses skew to the minimum by restricting the paper width.
3
Paper size detection rotation plate
Changes its own position in conjunction with the paper size (length) adjustment lever. By this
operation, the paper size detection plate position is changed and the paper size detector detects
the paper size.
operation, the paper size detection plate position is changed and the paper size detector detects
the paper size.
4
Paper size (length) guide plate
Regulates the paper size (length).
5
Paper widht guide L
By restricting the paper width, skew is restricted to the minimum.
6
Lift plate
Lifts the paper to maintain the paper feed position at the fixed position.
7
Paper pickup roller
Sends paper to the paper feed roller.
8
Separation roller
Separate paper to prevent against double feed
9
Paper feed roller
Feeds paper to the paper transport section.
10
Transport roller 8 (Paper feed tray 3)
Transport roller 5 (Paper feed tray 4)
Transport roller 5 (Paper feed tray 4)
Transports paper from the paper feed tray 3 to the transport rollers 9 and 10.
Transports paper from the paper feed tray 4 to the transport rollers 6 and 7.
Transports paper from the paper feed tray 4 to the transport rollers 6 and 7.
11
Transport roller 10 (Paper feed tray 3)
Transport roller 7 (Paper feed tray 4)
Transport roller 7 (Paper feed tray 4)
Transports paper from the transport rollers 7 and 8 to the transport roller 11.
Transports paper from the transport roller 5 to the transport roller 10.
Transports paper from the transport roller 5 to the transport roller 10.
12
Torque limiter
Provides a certain level of resistance power for the paper separation roller rotation to prevent
against double feed.
against double feed.
AR-M550/M620 DETAILS OF EACH SECTION 6 - 22
B. Operational descriptions
(1) Each paper feed tray paper size detection method
a. Multi-purpose paper feed tray (Tray 3), paper feed tray (Paper
feed tray 4)
1) Paper width detection
The paper width is calculated with the VR voltage value (A/D con-
version value) linked with the side guide plate.
version value) linked with the side guide plate.
Paper width and paper size (set in the range of standard value
±6 [mm]).
±6 [mm]).
2) Paper size detection
The paper size detection is made by the combination of the cas-
sette paper size detector 1 to 4.
sette paper size detector 1 to 4.
Relationship Between Paper Size and Detection by the Paper Size Detector
3) Combination of size detection
Width size
detection pattern
Paper size
Standard
value [mm]
Range [mm]
A
A3/A4
297.0
303.0 - 291.0
B
WLT/LT
279.4
285.4 - 273.4
C
B4/B5
257.0
263.0 - 251.0
D
LG/LTR/Foolscap
215.9
221.9 - 209.9
E
A4R
210.0
216.0 - 204.0
F
Exective-R
184.1
190.1 - 178.1
G
B5R
182.0
188.0 - 176.0
CSS2
CSS1
CSS3
CSS4
Vertical size
detection pattern
Detection SW status
AB size
Inch size
Width of detection
range
CSS1
CSS2
CSS3
CSS4
1
ON
ON
OFF
ON
B5
Extra
147.0 - 198.0
2
OFF
ON
OFF
ON
A4
LT
198.0 - 237.0
3
OFF
ON
ON
ON
B5R
EX-R
237.0 - 274.0
4
OFF
OFF
ON
ON
A4R
LTR
274.0 - 314.0
5
ON
OFF
ON
ON
Foolscap
Extra
314.0 - 347.0
6
ON
OFF
ON
OFF
B4
LGL
347.0 - 389.0
7
ON
ON
ON
OFF
A3
WLT
389.0 - 432.8
0
OFF
OFF
OFF
OFF
Paper feed tray not attached
Paper size
Width detection pattern
Vertical detection pattern
B5
C
1
A4
A
2
B5R
G
3
A4R
E
4
Foolscap
D
5
B4
B
6
A3
A
7
LT
B
2
EX-R
F
3
LTR
D
4
LGL
D
6
WLT
B
7
AR-M550/M620 DETAILS OF EACH SECTION 6 - 23
(2) Remaining paper detection
a. Remaining paper detection
Remaining paper detection is performed according to four stages, i.e.
three stages with paper and one stage with no paper, and the result is
displayed.
three stages with paper and one stage with no paper, and the result is
displayed.
b. Detection method
The number of remaining sheets is determined according to the num-
ber of times the remaining paper sensor changes from the time the
paper feed tray starts lifting up to the time when the upper detection
sensor comes ON.
ber of times the remaining paper sensor changes from the time the
paper feed tray starts lifting up to the time when the upper detection
sensor comes ON.
(Figure showing state transition of the remaining paper detection sensor during tray elevation and
changes in status according to the number of remaining sheets)
The no-paper detection sensor
detects the state of no remaining paper.
detects the state of no remaining paper.
1/3 Field
Sensor logic: Low
Sensor logic: Low
2/3 Field
Sensor logic: Hi
Sensor logic: Hi
3/3 Field
Sensor logic: Low
Sensor logic: Low
During no-paper detection
Remaining paper 1/3 position
Remaining paper 2/3 position
Remaining paper 1/3 position
Turn plate
MCPED
(paper sensor)
(paper sensor)
Remaining Paper
Detection Actuator
Detection Actuator
MCSPD
(remaining paper detection sensor)
(remaining paper detection sensor)
AR-M550/M620 DETAILS OF EACH SECTION 6 - 24
C. Maintenance and parts replacement
(1) Maintenance list
✕
: Check (Clean, replace, or adjust as necessary.)
❍
: Clean
▲
: Replace
∆
: Adjust
✩
: Lubricate
❏
: Shift position
(2) Maintenance and parts replacement
(List of Replacement Parts)
AR-M550U/M550N (PM: 250K)
When
calling
250K 500K 750K 1000K 1250K 1500K 1750K 2000K
Remark
AR-620U/M620N (PM: 300k)
300K 600K 900K 1200K 1500K 1800K 2100K 2400K
Unit name No.
Part name
Paper Feed
Trays 3 and
4
Trays 3 and
4
1
Pickup roller
✕
❍
❍
❍
❍
❍
❍
❍
❍
(Note 1)
2
Paper feed roller
✕
❍
❍
❍
❍
❍
❍
❍
❍
(Note 1)
3
Separation roller
✕
❍
❍
❍
❍
❍
❍
❍
❍
(Note 1)
4
Torque limiter
✕
✕
✕
✕
✕
✕
✕
✕
✕
(Note 1)
(Note 1) Replacement reference: For replacement, refer to each paper feed port counter value.
Torque limiter: 800K (However, 400K for manual paper feed section)
2
3
1
4
No.
Unit
Parts
a
Paper feed tray units 3
and 4
and 4
1
Pickup roller
✕❍
2
Paper feed roller
✕❍
3
Separation roller
✕❍
4
Torque limiter
✕
5
Paper pickup solenoid
6
Paper feed tray upper limit
detector
detector
7
Paper feed tray empty
detector
detector
8
Transport roller 8, 10
9
Transport roller 5, 7
10
Paper pass detector
b
Others
1
Paper size detection PWB
2
Paper remaining quantity
detector
detector
3
Paper feed tray paper
width detector
width detector
4
Dry heater
a-9
a-4
a-5
a-10
a-8
b-3
b-2
b-4
b-1
a-7 a-6
a-1
a-2 a-3
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