Icom ic-r20 Service Manual
Also see for IC-R20: Price listInstruction manualInstruction manualService manual
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4 - 11DescriptionReceive 3 V line from the LOGIC unit via the J1,pin 37. The voltage is supplied to the RF (IC19),IF (Q5) and LO (Q540) amplifiers, 1st (IC1) and2nd (IC10) mixers, regulators, etc.Receive 3 V line from the LOGIC unit via the J1,pin 22. The voltage is supplied to the RF (IC18),IF (Q542) and LO (Q555) amplifiers, 1st (IC15)and 2nd (IC16) mixers, regulators, etc.Receive 3 V converted from the A_R3V line bythe +3 regulator (Q509). The regulator is con-trolled by the HFC line from the main CPU(LOGIC unit; IC3, pin 46).Common 3 V converted from the A_R3V line bythe +3 regulator (Q527). The regulator is con-trolled by the NBC line from the D/A converter(IC22, pin 13).Receive 3 V converted from the A_R3V line bythe +3 regulator (Q501). The regulator is con-trolled by the A_300MC line from the expanderIC (IC14, pin 3).Receive 3 V converted from the A_R3V line bythe +3 regulator (Q502). The regulator is con-trolled by the A_VHFC line from the expander IC(IC14, pin 2).Receive 3 V converted from the A_R3V line bythe +3 regulator (Q502). The regulator is con-trolled by the A_UHFC line from the expander IC(IC14, pin 4).Receive 3 V converted from the B_R3V line bythe +3 regulator (Q554). The regulator is con-trolled by the B_VHFC line from the expander IC(IC20, pin 2).Receive 3 V converted from the B_R3V line bythe +3 regulator (Q554). The regulator is con-trolled by the B_UHFC line from the expander IC(IC20, pin 3).Receive 3 V converted from the B_R3V line bythe +3 regulator (Q503). The regulator is con-trolled by the B_GC line from the expander IC(IC20, pin 4).Receive 3 V converted from the B_R3V line bythe +3 regulator (Q503). The regulator is con-trolled by the B_800MC line from the expanderIC (IC20, pin 5).Receive 3 V converted from the B_R3V line bythe +3 regulator (Q546). The regulator is con-trolled by the B_AMC line from the expander IC(IC20, pin 18).LineA_R3VB_R3VHF3VNB3V300M3VA_VHF3VA_UHF3VB_VHF3VB_UHF3VB_G3VB_800M3VB_AM3V4-4-3 RF UNIT VOLTAGE LINESDescriptionThe voltage is same as connected battery pack.The voltage is supplied to the charge controller(Q32).Common 3 V converted from the VCC line orexternal DC power supply by the +3 regulator(IC8, pins 1 and 5). The output voltage is sup-plied to the main CPU (IC3), reset IC (IC2), EEP-ROM (IC1), etc.Common 3 V converted from the CPU3V line bythe +3 regulator (Q13 and Q14). The regulator iscontrolled by the +3SC line from the main CPU(IC3, pin 40). The output voltage is supplied tothe electronics volume (IC7), pre-amplifiers (Q12and Q16), etc.Common 3 V converted from the CPU3V line bythe +3 regulator circuit (Q17). The output voltageis supplied to the CI-V interface circuit (IC4, Q3and Q6), etc.Receive 3 V converted from the VCC line orexternal DC power supply by the +3 regulators(IC9, pins 1 and 5; Q10). The regulator is con-trolled by the A_R3C line from the main CPU(IC3, pin 67). The output voltage is supplied tothe RF unit, etc.Receive 3 V converted from the VCC line orexternal DC power supply by the +3 regulators(IC9, pins 1 and 5; Q15). The regulator is con-trolled by the B_R3C line from the main CPU(IC3, pin 75). The output voltage is supplied tothe RF unit, etc.LineVCCCPU3V+3S+3VA_R3B_R34-4 POWER SUPPLY CIRCUITS4-4-1 LOGIC UNIT VOLTAGE LINESDescriptionCommon 3 V from the LOGIC unit via the J7, pin1, and is then supplied to the SUB_3V regulator(Q2). The regulator is controlled by SUB_3C linefrom the sub CPU (IC2, pin 45).Common 3 V converted from +3V line by theSUB_3V regulator (Q2). The output voltage issupplied to the sub CPU (IC2), memory (IC6),RECORDING IC (IC7), etc.Line+3VSUB_3V4-4-2 REC UNIT VOLTAGE LINESDescriptionCommon 3 V from the LOGIC unit via the J7, pin1, and is then supplied to the SUB_3V regulator(Q2). The regulator is controlled by SUB_3C linefrom the sub CPU (IC2, pin 45).Common 3 V converted from +3V line by theSUB_3V regulator (Q2). The output voltage issupplied to the sub CPU (IC2), memory (IC6),RECORDING IC (IC7), etc.Line+3VSUB_3V4-4-2 REC UNIT VOLTAGE LINES |
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