Board Descriptions A - 27 OF 5300/5600 Serv Man, P/N 59278301A3.2.8 M17 Circuit Diagram1. Block diagramThe circuit diagram shown consists of the following connectors:• Connector CN6 that provides an interface between M17 board and NCU board.• Connector CN7 that provides an interface between M17 board and external electro-mechanical devices (PC1 and PC2).• Connector CN9 that provides an interface between M17 board and OPE (O5W) unit.Figure A3.2.9 shows an interface between M17 board and NCU board.Figure A3.2.10 shows an interface between M17 board and OPE unit.Figure A3.2.11 shows the related signals of PC1 and PC2.2. Function1) External status supervising interface (PC1/PC2)External status is detected by the photocouplers (PC1/PC2) in the mechanism and thesignal 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 toOPE unit which will control the main-power supply.• PC2:Presense of document at scanning position.3. OthersNCU 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 replay• PP : Relay control signal for special service code detection at parallelpickup or remote reception• PBXE : Control signal for connecting one of LINE terminal to the PBXEterminal• OH2 : Detection of off-hook of terminal connected to TEL-1 or TEL-2• OH1 : Output upon circuit current detection after fax line seizure• RP : Receiving sensistivity 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 sequencially the contents of each data of TXD(LED on/off information, etc.) to OPE in serial data from CPU.• RXDOPE : This signal transmits sequencially 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• PSMODE : Power Save Mode off signal from OPE.• MP/OFF : Main Power On/Off signal to Main Power Supply Unit.• MPREQ : Main Power off signal from CPU.Rev. 2
