Signal Block Diagram - Toshiba e-STUDIO520 Service Manual

16.4 Signal Block Diagram

Engine
RXD
SGND
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 engine and RADF.
REQ ......................Communication request signal (engine to RADF)
DF-REQ ...............Communication request signal (RADF to engine)
DF-ACK.................Response signal to communication request signal (RADF to engine)
ACK.......................Response signal to communication request signal (engine to RADF)
TxD .......................Data sent to RADF from engine
RxD .......................Data sent to engine from RADF
SCN_STR .............Scanning start signal
DF_CNT................Detection signal of connection to RADF
The data communication (RxD and TxD) between the engine and RADF is adopting a serial communi-
cation system which makes it impossible to check with a testing device whether signals are sent/
received properly.
e-STUDIO520/600/720/850 REVERSING AUTOMATIC DOCUMENT FEEDER (RADF)
RADF ( Reversing automatic document reader )
SW10
SW9
S53
S54
S55
S56
S57
S58
S59
S60
S61
S62
S63
S64
S65
S66
S67
S68
S69
S70
DC +24V
DC +5V
Fig.16-9
16 - 6
EEPROM
Sensor
input
circuit
CPU
Driver
Commu-
nication
circuit
Irruptive
current
control
circuit
SOL4
SOL5
SOL6
M36
M37
M38
M39
M40
March 2005 © TOSHIBA TEC