Sharp AR-250, Service Manual

Page: 48 / 196

H. RADF (AR-285/286/287/335/336/337/405/407 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
2 Reverse sensor PWB Document reverse detection
3 LED PWB
Document feed, document
remaining display
4
Original timing sensor
PWB
Document timing detection
5
Original reverse
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 DRSOL Reverse solenoid DC solenoid
5 DFSOL Paper feed solenoid DC solenoid
4) Sensors, switches, detectors
No. Code Functions and operations
1 DLS2
Original length detection on the tray (Inch
series only)
2 TGOD Reverse cover open/close detection
3
RDD Turns HIGH when the original lead edge is
transported to the reverse/paper exit path.
4 DWVR Original width detection on the tray
5
DTD Turns HIGH when the original lead edge is
transported from the paper feed section to the
vicinity of the transport belt.
6
DFD Turns HIGH when the original lead edge is fed
just in front of the resist roller.
7 DWS Original width detection
8 FGOD Paper feed cover open/close detection
9 DFMRS Paper feed motor rotation detection
10 AUOD ADF unit open/close detection
11 DSS Original detection on the tray
12 DLS1 Original length detection on the tray
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