Oki OF5600 Service Manual
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Contents
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Page: 217Service Manual for OF5300/5600Chapter A Board Descriptions1. Block diagramFigure A3.4.1 shows a block diagram of OPE (05W).The O5WH (operation unit) circuit consists of the following blocks:1) IC1 (one chip MOS-CPU)Output portsSetting LEDs on and off: 8 portsSpecifies the row during key switch matrix scanning: 8 portsInput portsDetect the column whose key is pressed: 8 ports2) Key switch matrix (8 rows x 8 columns)3) LEDs (8 LEDs)4) LCD unit2. Key switch scanningOutput ports (KSCAN0 to KSCAN7 signal) corresponding to 8 rows of key matrix are scanned sequentiallyby the software. In the case 1 is any of output from KSCAN0 to KSCAN7 signal which corresponds to therow 8 in the block diagram, the software reads input port, KSENS0 to KSENS7, and determines which inthe row 8 is pressed.3. LED drives and LEDsEight LEDs (ALARM, PHOTO, LIGHT, etc.) on the control panel are driven by output of IC1 via resistorsR1, R4-9 and R11 respectively. An LED lights when a port output is 1.4. In case sub-power supply is applied to the fax machine: when PC1-N, HUP-N or RIINT signal isinput to OPE unit, OPE unit controls the main power supply (120/230 board) by outputting the MP/OFF(ACON) signal.PC1-N: Presence of document on hopperHUP-N: OFF-Hook detection for TEL 1 and TEL 2 terminalRIINT: Ringing detection signal |
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