Board Descriptions
A - 30
OKIOFFICE 44 Serv. Man., P/N 59276801
A3.1.8
R44 Circuit Diagram
1.
Block diagram
The circuit diagram consists of the following connectors:
•
Connector CN10 that provides an interface between R44 board and NCU board.
•
Connector CN3 that provides an interface between R44 board and external electro-mechanical
components (PC1 and PC2).
•
Connector CN4 that provides an interface between R44 board and OPE (O4W) unit.
Figure A3.1.8 shows an interface between R44 board and NCU board.
Figure A3.1.9 shows an interface between R44 board and OPE unit.
Figure A3.1.10 shows the related signals of PC1 and PC2.
2.
Function
1)
External status supervising interface (PC1/PC2)
External status is detected by the photocouplers (PC1/PC2) in the mechanism and the
signal is output to the input port of CPU via this interface circuit.
•
PC1: Presence of document on hopper.
When sub-power supply is applied to the fax machine, this signal is output to
OPE unit which will control the main-power supply.
•
PC2: Presence of document at scanning position.
3.
Others
NCU interface signal
•
CML
: Line seizure control signal
•
DP
: Dial pulse control signal
•
SR
: Control signal for connection between LINE and TEL terminals
•
MUTE
: Control signal for pulse dial improvement and bell shunt relay
•
PP
: Relay control signal for special service code detection at parallel pickup or
remote reception
•
PBXE
: Control signal for connecting one of LINE terminal to the PBXE terminal
•
OH2-N
: Detection of off-hook of terminal connected to TEL-1 or TEL-2
•
OH1-N
: Output upon circuit current detection after fax line seizure
•
RP
: Receiving sensitivity determination terminal
•
RI
: Ringing detection signal
•
S
: Send signal (picture data/protocol/tonal signals/PB tone etc.)
•
R
: Received signal (picture data/protocol/tonal signals etc.)
OPE interface signals
•
TXDOPE
: This signal transmits sequentially the contents of each data of TXD (LED
on/off information, etc.) to OPE in serial data from CPU.
•
RXDOPE
: This signal transmits sequentially the contents of each data of RXD (key
code information, etc.) to CPU in serial data from OPE.
•
OPECHK
: Use to monitor the operation of the OPE unit.
•
OPERST
: Reset signal for OPE unit
•
WAKEUP-N
: Wakeup signal
Summary of Contents for OKIOFFICE 44
Page 2: ...All specifications are subject to change without notice Service Manual OKIOFFICE 44 59276801...
Page 135: ...Disassembly 4 6 OKIOFFICE 44 Service Manual P N 59276801 Whole Unit Picture FX048 CP4 1 Fig 01...
Page 329: ...Illustrated Parts List D 6 OKIOFFICE 44 Service Manual P N 59276801 Section 2 Printer Unit...
Page 331: ...Illustrated Parts List D 8 OKIOFFICE 44 Service Manual P N 59276801 Section 3 Operator Panel...
Page 351: ...Illustrated Parts List D 28 OKIOFFICE 44 Service Manual P N 59276801 Section 12 Cables...
Page 357: ...Board Layout E 2 OKIOFFICE 44 Service Manual P N 59276801 MEM eps E 2 MEM PCB...
Page 358: ...Board Layout E 3 OKIOFFICE 44 Service Manual P N 59276801 TEL U eps E 3 TEL U PCB...
Page 359: ...Board Layout E 4 OKIOFFICE 44 Service Manual P N 59276801 Hook eps E 4 Hook PCB...
Page 388: ...OKIOFFICE 44 Service Manual Part Number 59276801 Printed in the USA...