Icom IC-R6 Service Manual

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Contents

Icom IC-R6 Service Manual Manual pdf 12 page image

4 - 44-4 VOLTAGE BLOCK DIAGRAMVoltage from the power supply is routed to throughout thetransceiver via regulators and switches.4-5 CPU PORT ALLOCATIONBATTERYPACKJ500D508CP3 D509CP4DCSWCHRGCHRGC TRLDC-DCCONVRESE TLOGI CC TRL+3SC TRLIFVC TRLCHGCHVRESETLOGIC3.3V+3SIFVPCONIF CONQ500,D501Q501,D500,D503Q502IC102IC3Q103Q102Q104+3VIC104REG+3.3CPULIMITD511REG+5VIC455,Q512,Q513CHRGC TRLQ509CHRGQ510,D507CHGSREG+2SIC103+2S+3SCLOGIC3.3VVCC+3VPinNo.LineName Description I/O1 IOCK Expand IC serial clock. O2 IOSTB Expand IC strobe. O3 IOEN Expand IC chip enable. O4 IODATA Expand IC serial data. O5 ESIO EEPROM serial data. I/O6 ECK EEPROM serial clock. O7 CHGCCharging circuit control.H=While regular charging.L=While trickle charging.O8 TCONTone fi lter contol.L= While the tone squelch function isin use.O9 AMUTE AF mute switch control.H=AF mute. O15 ATT Attenuator control.L=The attenuator is ON. O16 SHIFT 1st VCO oscillation frequency rangeshift. O17 CLS CPU clock frequency shift.H=Clock frequency is shifted. O18 DBL1Doubler circuit (DBL1; Q31, D43,D50) control.L= While receiving 283–494.2 MHzand 833–1066.7 MHz.O19 AF_FILAF filter (LOGIC UNIT: R350 andC404) control.H= The AF fi lter setting is ON.O38 AFSELAF filter (LOGIC UNIT: Q301/Q302)select.H=While receiving in the FM mode.The AF fi lter (Q302) is selected.L= W h i l e r e c e i v i n g i n t h e W F M /AM mode.The AF filter (Q301) isselected.O41 AFON AF power AMP control.L=AF power AMP is activated. O42 LIGHTBacklight LED control.H=The backlight (DS2 and DS3)lights.O43 VR_CLK Electric volume IC serial clock. O44 VR_DATA Electric volume IC serial data. O45 MODE [MODE] input.L= Pushed. I53 DUD [DIAL] input. (Data) I54 DCK [DIAL] input. (Clock) I98 FSET Reference frequency adjustmentvoltage. O99 TRAC Bar antenna tuning voltage. O103 VSC Demodulated AF signal input. (Forthe ＶＳＣ function) I104 K2 [UP] and [DOWN] inputs. I105 K1 [BAND], [V/M] and [MODE] inputs. I106 RSSI RSSI voltage from the IF demodulatorIC (RF UNIT: IC12, pin16). I107 VIN Remaining battery voltage. I108 CTONE To n e s i g n a l s ( W X / M S K / T R A I N )decoding input. I109 RTONE To n e s i g n a l s ( C T C S S / D T C S )decoding input. I110 TEMP Temperature sensing voltage. I111 SQL [SQL] input.L= Pushed. I