Toshiba e-studio550 Service Manual page 243

16. 4. Signal Block Diagram
Copier
RXD
SG ND
TXD
ACK
REQ
SCN_STR
DF_ACK
DF_REQ
DF_CNT
DC +24V
DC +5V
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.
e-STUDIO550/650/810 RADF
RADF (Reversing automatic document reader)
COP-SW
COPSW
DFOP-SW
DF OP SW
DFOPN-SNS
DF OP NS
AP-SNS
APS
SIZE1-SNS
SIZE1
SIZE2-SNS
SIZE2
SIZE3-SNS
SIEZ3
REGS-SNS
REGS
EMPS-SNS
EMPS
ULMTS-SNS
UL MTS
LLMTS-SNS
LLMTS
IMT-F-SNS
ITFS
SOE-SNS
SO ES
COPS-SNS
COPS
TRYS-SNS
TRYS
TRVR-SNS
TRVR
SSBS-SNS
SSBS
READS-SNS
READS
LOES
LOE-SNS
LNGS-SNS LN GS
DC +24V
DC +5V
16 - 6
EEPROM
Sensor
input
circuit
CPU
Driver
Commu-
nication
circuit
Irruptive
current
control
circuit
LSO L
SSO L
ESSOL
TLMO T
RMOT
SMO T
FMO T
LMO T
JUNE 2002 © TOSHIBA TEC