Icom IC-F3GS service manual Inside Views, Main Unit TOP View, Bottom View

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SECTION 2 INSIDE VIEWS

• MAIN UNIT

TOP VIEW

Antenna swtching circuit (D1, D2, D8: MA77)

Power amplifier (Q1: 2SK2974)

Low-pass filter circuit

APC

(IC3A: NJM2902V ) Q37: DTA144EU

FM IF IC

(IC2: TA31136FN(D))

IF amplifier

(Q14: 2SC4215 O)

Mic amplifier circuit

PLL IC

(IC1: PD3140GS)

TX/RX switch (D3, D4: MA77)

BOTTOM VIEW

RF amplifier (Q12: 3SK293)

1st mixer

(Q13: 3SK239A)

Crystal filter

(FI1: FL-311 [NARROW]) FL-312 [WIDE]

PLL reference oscillator (X1: CR-664 15.3 MHz)

VCO circuit

D/A converter

(IC10: M62363FP-560C)

EEPROM

(IC7: HN58X2432TI)

CPU

(IC8: HD64738747H)

2 - 1

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Contents VHF FM Transceivers Repair Notes IntroductionOrdering Parts Table of Contents ‘ General Section Specifications‘ Transmitter ‘ ReceiverBottom View Inside ViewsMain Unit TOP View Disassembly Instruction Disassembly and Option InstructionsRemoving the Chassis Panel Removing the Main UnitSponge Optional Unit InstallationsReceiver Circuits Circuit DescriptionTransmitter Circuits PLL Circuit Power Supply Circuits Voltage LineVCC OPTOutput Expander IC IC10 Port AllocationsPreparation Adjustment ProceduresClone SPEGND PLL Adjustment Software Adjustment DC Power SupplyPLL Lock PLL AdjustmentMain VoltageSoftware Adjustment Squelch SensitivityLevel SQLMain Unit Parts ListVariable Ceramic JB 1C Accessories Mechanical Parts and DisassemblyChassis Parts EP1 EP2 MP1 MP2IC-F3GS parts Diodes SEMI-CONDUCTOR InformationTransistor and FET’S Main Unit Board LayoutsIC8 FI2IC5 CirqBlLOCK Diagram IC3C Voltage DiagramIC1 DTA144EU Avref Vtref Toned Tonem Avcc Section Voltage Diagram16, Kamihigashi, Hirano-ku, Osaka 547-0002, Japan 16, Kamihigashi, Hirano-ku, Osaka, 547-0002, Japan
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