Sharp AR-810 (serv.man20) Service Manual ▷ View online
AR-651/810 RADF (DOCUMENT FEEDER) 16 - 5
(5) Tray lift motor rotating forward (seen in front)
Tray lift motor
Tray lift motor
Tray lift motor rotates
counterclockwise to lift the tray.
(6) Tray lift motor rotating in reverse (seen in front)
Tray lift motor rotates
clockwise to lower the tray.
Lifting tray
LIfting tray
AR-651/810 RADF (DOCUMENT FEEDER) 16 - 6
16. 4. Signal Block Diagram
LLMTS-SNS
RADF (Reversing automatic document reader)
COP-SW
DFOP-SW
DFOPN-SNS
AP-SNS
SIZE1-SNS
SIZE2-SNS
SIZE3-SNS
REGS-SNS
EMPS-SNS
ULMTS-SNS
RXD
SG ND
TXD
ACK
REQ
SCN_STR
DF_ACK
DF_REQ
DF_CNT
DC +24V
Copier
COPS
DC +5V
Sensor
input
circuit
EEPROM
Driver
SSO L
ESSOL
LSO L
FMO T
CPU
TLMO T
RMOT
SMO T
LMO T
DF OP SW
COPSW
DF OP NS
APS
SIZE1
SIZE2
SIEZ3
LOES
LN GS
TRYS
TRVR
SSBS
READS
SO ES
REGS
EMPS
UL MTS
LLMTS
ITFS
IMT-F-SNS
SOE-SNS
COPS-SNS
TRYS-SNS
TRVR-SNS
SSBS-SNS
READS-SNS
LOE-SNS
LNGS-SNS
DC +24V
DC +5V
Commu-
nication
circuit
Irruptive
current
control
control
circuit
The following 8 lines are used for sending/receiving of signals between the copier and RADF.
REQ ................................ Communication request signal (copier to RADF)
DF-REQ .......................... Communication request signal (RADF to copier)
DF-ACK .......................... Response signal to communication request signal (RADF to copier)
ACK ................................ Response signal to communication request signal (copier to RADF)
TxD ................................. Data sent to RADF from copier
RxD ................................ Data sent to copier from RADF
SCN_STR ....................... Scanning start signal
DF_CNT .......................... Detection signal of connection to DF
The data communication (RxD and TxD) between the copier and RADF is adopting a serial
communication system which makes it impossible to check with a testing device whether signals are
sent/received properly.
AR-651/810 RADF (DOCUMENT FEEDER) 16 - 7
16. 5. Operations
16. 5. 1. A4 single-sided feeding
(Operational condition: A4 original/Reproduction ratio: 100%)
(1) Original setting
The empty sensor turns ON when the original has been set on the original feeding tray.
(2) Lifting of the lifting tray
The tray lift motor rotates to lift the tray after receiving the original feeding signal from the copier. With a
specified delay after the upper limit sensor has detected a top side of the original, the tray lift motor
stops rotating.
(3) Start of separation
The feed motor starts to rotate forward. When the original length sensor detects the leading edge of the
original, the tray lift motor starts to rotate to lower the tray to a specified level.
The feed motor stops rotating when the original has been transported a specified distance after the
registration sensor had detected the leading edge of the original. From 2nd original, feeding starts after
the admission signal to start feeding is received.
AR-651/810 RADF (DOCUMENT FEEDER) 16 - 8
(4) Start of feeding
The feed motor starts to rotate in reverse. After the feed motor has finished accelerating, the read motor
starts to rotate forward. With 1st original, both the feed and read motors start to slow down when the
leading edge of the original has come to a specified distance before the read sensor.
From 2nd original, the feed motor starts to slow down when the leading edge of the original has come to
a specified distance before the 1st roller. The feed motor stops rotating when the original length sensor
has detected the trailing edge of the original. At the same time, the tray lift motor starts to rotate to lift
the tray. When the tray has come to a specified level after the upper limit sensor had detected the top
side of the original, it stops rotating.
The empty sensor detects whether or not there is a next original with a specified delay after the original
length sensor has detected the trailing edge of the original. Without a next original, the tray lift motor
starts to lower the tray to turn the original set signal OFF. When the lower limit sensor has detected the
tray, it stops rotating. With a next original, the separation begins at the same time the scanning begins.
When the original has been transported a specified distance by the read motor after the read sensor had
detected the leading edge of the original, the read motor stops rotating and the original stop signal turns
ON.
(5) Start of 1st original scanning
The scanning begins after receiving the original transport signal from the copier. At the same time, the
original stop signal is reset. Then the read motor starts to rotate forward and to separate the next
original.
The SCN-STR turns ON when the leading edge of the original has reached the scanning section. When it
has been transported to the intermediate transport section and come to a specified distance before the
intermediate transport roller, the large original exit motor starts to rotate in reverse.
Feeding of 2nd original starts when the original has been transported a specified distance by the read
motor after the original length sensor had detected the trailing edge of the original.
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