Read Sharp AR-285 (serv.man10) Service Manual online
G. RADF (AR-285/335 only)
1) Main parts
No.
Function, operation
1
Original stopper
2
A21 weight plate
3
Semi-circular roller
4
Paper exit roller
5
Flapper
6
Reverse roller
7
Transport belt follower roller
8
Original transport belt
9
Transport belt drive roller
10
Paper feed roller
11
Resist roller
12
Separation roller
2) PWB distribution
No.
Name
Function, operation
1
Control PWB
RADF unit control, PCU
communication
communication
2
Reverse sensor PWB
Document reverse detection
3
LED PWB
Document feed, document
remaining display
remaining display
4
Original timing sensor
PWB
PWB
Document timing detection
5
Original reverse
sensor PWB
sensor PWB
Document feed detection
3) Motors, solenoids, and clutches
No.
Code
Name
Type
1
DFM
Paper feed motor
DC motor
2
DTM
Transport motor
Stepping motor
3
DRM
Reverse motor
Stepping motor
4
DFSOL
Paper feed solenoid
DC solenoid
5
DRSOL
Reverse solenoid
DC solenoid
4) Sensors, switches, detectors
No.
Code
Functions and operations
1
DFD
Turns HIGH when the original lead edge is fed
just in front of the resist roller.
just in front of the resist roller.
2
DTD
Turns HIGH when the original lead edge is
transported from the paper feed section to the
vicinity of the transport belt.
transported from the paper feed section to the
vicinity of the transport belt.
3
RDD
Turns HIGH when the original lead edge is
transported to the reverse/paper exit path.
transported to the reverse/paper exit path.
4
DWVR
Original width detection on the tray
5
DLS1
Original length detection on the tray
6
DLS2
Original length detection on the tray (Inch series
only)
only)
7
DSS
Original detection on the tray
8
DFMRS
Paper feed motor rotation detection
9
DWS
Original width detection
10
AUOD
ADF unit open/close detection
11
FGOD
Paper feed cover open/close detection
12
TGOD
Reverse cover open/close detection
12
1
2
3
4
5
6
7
8
9
10
11
1 OPCLS
4 DWTR
3 SIZ2
2 SIZ1
7 POS
6 REGS
8
14
13
10
11
12
9 DTM
5 EMPS
3 DRM
2 DTM
1 DFM
4 DFSOL
5 DRSOL
10 AUOD
8 DFMRS
7 DSS
5 DLS1
12 TGOD
4 DWVR
11 FGOD
9 DWS
1 DFD
2 DTD
3 RDD
6 DLS2
6 – 7
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