PLL Adjustment, PLL Lock, Main, Voltage | Icom IC-F3GS manual

5-2 PLL ADJUSTMENT

ADJUSTMENT		ADJUSTMENT CONDITIONS		MEASUREMENT		VALUE	ADJUSTMENT

			UNIT		LOCATION		UNIT	ADJUST
			UNIT		LOCATION		UNIT	ADJUST

PLL LOCK	1	• Operating frequency: 146.000 MHz	MAIN		Connect a digital multi	2.0 V	MAIN	L11
VOLTAGE		• Receiving			meter to check point
					LV.
	2	• Transmitting			LV.	1.5–2.5 V		Verify
	2	• Transmitting				1.5–2.5 V		Verify

• MAIN unit

RF power meter

L11

PLL lock voltage adjustment

LV

PLL lock voltage check point

Bottom view

5 - 4

Image 15

Icom IC-F3GS service manual PLL Adjustment, PLL Lock, Main, Voltage

Contents

VHF FM Transceivers Introduction Ordering PartsRepair Notes Table of Contents ‘ Receiver Section Specifications‘ General ‘ Transmitter Inside Views Main Unit TOP ViewBottom View Removing the Main Unit Disassembly and Option InstructionsDisassembly Instruction Removing the Chassis Panel Sponge Optional Unit Installations Receiver Circuits Circuit Description Transmitter Circuits OPT Power Supply Circuits Voltage LinePLL Circuit VCC Output Expander IC IC10 Port Allocations Preparation Adjustment Procedures SPE GNDClone PLL Adjustment Software Adjustment DC Power Supply Voltage PLL AdjustmentPLL Lock Main Software Adjustment SQL SensitivitySquelch Level Main Unit Parts List Variable Ceramic JB 1C EP1 EP2 MP1 MP2 Mechanical Parts and DisassemblyAccessories Chassis Parts IC-F3GS parts SEMI-CONDUCTOR Information Transistor and FET’SDiodes Main Unit Board Layouts Cirq FI2IC8 IC5 BlLOCK Diagram IC3C Voltage Diagram IC1 DTA144EU Avref Vtref Toned Tonem Avcc Section Voltage Diagram 16, Kamihigashi, Hirano-ku, Osaka 547-0002, Japan 16, Kamihigashi, Hirano-ku, Osaka, 547-0002, Japan