Sharp AR-M550 (serv.man4) Service Manual ▷ View online
AR-M550/M620/M700 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/M700 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)
: Feb. 6 2004
1
AR-M550/M620/M700 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/N (PM: 250K)
When
calling
250K 500K 750K 1000K 1250K 1500K 1750K 2000K
Remark
AR-M620U/N, AR-M700U/N
(PM: 300k)
(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)
1
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)
Paper feed tray 3/4, paper feed unit section: 100K or 1 year
1
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
1
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
: Feb. 6 2004
1
AR-M550/M620/M700 DETAILS OF EACH SECTION 6 - 25
a. Paper feed tray units 3 and 4
1) Gently pull out the paper feed tray until it stops.
2) Lifting up the paper feed tray unit slightly, remove it at an angle
from the right side.
3) Open the bottom left cabinet.
4) Remove the connector cover.
1
5) Disconnect the connectors.
6) Remove the paper feed tray paper feed units 3 and 4 from the
lower shelf.
a-1. Pickup roller
1) Remove the paper feed tray units 3 and 4. (See “a. Paper feed tray
units 3 and 4”)
2) Remove the paper guide.
3) Unhook the claws to remove the pickup roller.
1
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