Read Sharp AR-810 (serv.man20) Service Manual online
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.
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