NEC FP1355 Service Manual

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NEC FP1355 Service Manual Manual pdf 46 page image

1 - 401.6.8 Display Data ChannelThe DDC2B/2Bi function belongs to IC101 (microcomputer).DDC2B: Immediately after the monitor power is turned ON, the microcomputer reads the EDIDdata from IC104. It outputs the EDID data according to the clock input into pin 34 SCL-DDC.DDC2Bi: The monitor adjusts the picture etc. corresponding to DDC2Bi command which isinput to pin 34 SCL-DDC and pin 35 SDA-DDC of microcomputer. This DDC2Bi command isused for the adjustment operated at factory. In case general user uses this, he/she needsspecified application and adapter.1.6.9 LEDJ102 pin 1 is connected to the anode of the green LED, J100 pin 2 is connected to the anodeof the amber LED, and pin 6 is connected to the cathodes of both. Since P_OFF_+5V isnormally supplied, the current flows to J102 pin 1 to turn OFF Q100. Therefore, any currentdoes not flow to J102 pin 2.(The green LED only is lit.)Since P_OFF_+5V is turned OFF in the power management mode, no current is not flowed toJ102 pin 1 to turn ON Q100. Therefore, the current flows to J102 pin 2. (The Orange LED onlyis lit.)Table 7 IC101 (MPU) Pin assignmentPIN#12345678910111213141516171819202122232425262728FUNCTIONDA0DA1DA2DA3DA4DA5DA6DA7DA8VSSAVDDAPB7/AN7PB6/AN6PB5/AN5PB4/AN4PB3/AN3PB2/AN2PB1/AN1PB0/VFBACK/AN0VSYNCI1PC7/VSYNCI2/ITDPD6/CLAMPOPD5/ITAPD4/ITBPD3/ITCPD2/VSYNCOPD1/HSYNCOOD0/CSYNCIASSIGNMENTH/V-ADJ(D/A)LIN(D/A)ROTATION(D/A)VCANCEL(D/A)PWM-HEAT(D/A)TL(D/A)TR(D/A)BL(D/A)BR(D/A)GND+5VKEY-4DIR(A/D)KEY-PUSH(A/D)THERM(A/D)BEAM-TIME(A/D)ABL(A/D)X-PRO(A/D)X-OUT(A/D)Y-OUT(A/D)V-SYNC(IN)DEGAUSS(OUT)CLP(OUT)LOCK(IN)LED(OUT)SPARK(OUT)VS-OUT(OUT)HS-OUT(OUT)G-SYNC(IN)PIN#56555453525150494847464544434241403938373635343332313029FUNCTIONVPP/TESTIRINNOT(RESET)PA0PA1PA2PA3PA4PA5PA6PA7/BLANKOOSCINOSCOUTUSBVCCUSBDPUSBDMUSBGNDPC7/TDO(SCI)PC6/RDI(SCI)PC5/SDAI(I2C)PC4/SCLI(I2C)PC3/SDAD(DDC)PC2/SCLD(DDC)/RXPCI/HSYNCI2PC0/OCMP/HFBACKVDDHSYNCI1VSSASSIGNMENTGNDGNDRESET(IN)SEL(OUT)DATA(OUT)CLOCK(OUT)HSK(OUT)USB-RST(OUT)INT-SUB(OUT)NCWP(OUT)CRYSTAL-INCRYSTAL-OUTNCNCNCGNDPRO1(IN)SDA-I2C(IN)SDA-I2C(OUT)SCL-I2C(OUT)SDA-DDC(SIO)SCL-DDC(SIO)P-OFF(OUT)P-SUS(OUT)+5VH-SYNC(IN)GND