Circuit Diagram (7/13) - Oki OKIFAX4550 Maintenance Manual

3.7 46F Circuit Diagram (7/13)
1. Block diagram
46F-PCB circuit diagram (7/13) shown the consists of the following connectors:
• Connector CN10 that provides an interface between 46F board and NCU/G4N board.
• Connector CN3 that provides an interface between 46F board and external electro-mechanical
conponents (PC1 and PC2).
• Connector CN4 that provides an interface between 46F board and OPE (O4W) unit.
Figure A.12 (1/4) shows an interface between 46F board and NCU board.
Figure A.12 (2/4) shows an interface between 46F board and OPE unit.
Figure A.12 (3/4) shows the communication signal between MCNT and OPE.
Figure A.12 (4/4) 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:
• PC2:
3. Others
NCU interface signal
• CML
• DP
• SR
• MUTE
• PP
• PBXE
• OH2-N
• RP
• RI
• S
• R
OPE interface signals
• TXDOPE : This signal transmits sequencially the contents of each data of TXD (LED on/off
• RXDOPE : This signal transmits sequencially the contents of each data of RXD (key code
• OPECHK : Use to monitor the operation of the OPE unit.
• OPERST : Reset signal for OPE unit
G4N interface signals
Refer to section 9.
41309401TH Rev.4
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.
Presence of document at scanning position.
: Line seizure control signal
: Dial pulse control signal
: Control signal for connection between LINE and TEL terminals
: Control signal for pulse dial improvement and bell shunt relay
: Relay control signal for special service code detection at parallel pickup or remote
reception
: Control signal for connecting one of LINE terminal to the PBXE terminal
: Detection of off-hook of terminal connected to TEL
: Receiving sensitivity determination terminal
: Ringing detection signal
: Send signal (picture data/protocol/tonal signals/PB tone etc.)
: Received signal (picture data/protocol/tonal signals etc.)
information, etc.) to OPE in serial data from CPU.
information, etc.) to CPU in serial data from OPE.
318 /