Icom IC-V8 Service Manual

Also see for IC-V8: Instruction manual Instruction manual Service manual Instruction manual

Contents

Pin Port Descriptionnumber namePin Port Descriptionnumber name4 - 44-6 PORT ALLOCATIONS4-6-1 CPU (IC8)191112141617192123–252628–3032–3544–474849505152535455DICKRESETCSIFTSCKSOCLINCLOUTNOISS1OPV1–OPV3CONTV3–V1COM4–COM1KR3–KR0UNLKRMUTMMUTDUSEPCONR5CT5CTXCInput port for the clock signal from the[DIAL] (S801).Input port for reset signal.Outputs reference oscillator for theCPU control signal.Outputs serial clock signal to the PLLIC (IC1, pin 2), D/A convertor IC (IC10,pin 7) and optional unit.Outputs serial signals to the PLL IC(IC1, pin 3), D/A convertor IC (IC10,pin 8) and optional unit.Input port for the cloning signal.Outputs the cloning signal.Input port for noise signals (pulsetype).Input port for the power switch.Low : While POWER switch ispushed.I/O ports for optional unit detectionsignals from/to J5.Outputs LCD contrast control signal.Input port for the bias signals for theLCD.Outputs LCD common signals.Input port for initial matrix.Low : While keys are pushing.Input port for PLL unlock signal fromthe PLL IC (IC1, pin 14).Low : During lock.• Outputs RX mute control signal.• Input port for the RX mute signalfrom the optional unit.• Outputs TX mute control signal.• Input port for the TX mute signalfrom the optional unit.Outputs low-pass filter cut-off frequen-cy control signal when DTCS is acti-vated.Outputs SW5 regulator (Q55, Q57,Q39) control signal.Low : While power is ON.Outputs R5 regulator (Q21) controlsignal.Low : While receiving.Outputs T5 regulator (Q22) controlsignal.Low : While transmitting.Outputs APC circuit (Q37, IC3) controlsignal.High : While transmitting.565758596061626364–879091949596979899100Outputs control signal for the regulatorcircuit of AF power amplifier.High : When squelch is open, etc.Outputs LCD backlight control signal.High : Lights ON.Outputs EEPROM (IC7, pin 6) clocksignal.I/O port for the data signals from/to theEEPROM (IC7, pin 5).I/O port for strobe signals from/to theD/A convertor IC (IC10, pin 6).Outputs strobe signals to the PLL IC(IC1, pin 4).Outputs VCO5 regulator (Q11) controlsignal.Low : While power is ON.Outputs PS5 regulator (Q54) controlsignal.Low : While power is ON.Output LCD driver signals.Outputs CTCSS and DTCS tone sig-nal.Outputs DTMF, BEEP and 1750 Hztone signal.Input port for CTCSS and DTCSdecoded signals.Input port for the [PTT] switch.High : While [PTT] switch is pushed.Input port for the UP/DOWN signalfrom the [DIAL] (S801).Input port for the remote signals froman optional microphone (HM-75A) viathe [MIC] jack.Input port for the RSSI detection.Input port for the PLL lock voltage.Input port for the transceiver’s internaltempareture detection.AFONLIGTESCKESDADASTPLSTPSVCOPS5CSEG1–SEG23CTCCTONECTCINPTTDIUDREMOSDLVINTEMP