Icom IC-F4021T Service Manual
Also see for IC-F4021S: Instruction manualInstruction manualInstruction manual
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5 - 5CPU5Vregurator+5VreguratorS5VreguratorT5VreguratorR5VreguratorPower switchR315F701(PA unit )Q26–Q28IC17Q23Q24Q25, Q48VCCCPU5CPU+5VS5V“S5C”“PWON”Voltage lineControl signal8228788“T5C”“R5C”T5VLED backlight driver (Q45),LCD driver (IC20),D/A converter (IC12), etc.CPU (IC22),EEPROM (IC10),Reset IC (IC8), etc.Drive amplifier (Q702),Power amplifier (Q701), etc.PLL IC (IC2),VCO’s, etc.Transmit circuitsReceive circuits R5V(IC22)Battery pack5-4 POWER SUPPLY CIRCUITSVoltage from the attached battery pack is routed to whole of the circuit in the transceiver via a switch and regulators. |
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