Icom IC-4008MKII service manual Introduction, Ordering Parts, Repair Notes

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INTRODUCTION

This service manual describes the latest service information

for the at the time of publication.

MODEL

VERSION

SYMBOL

BODY COLOR

IC-4008MK

Italy

ITA

BLACK

 

 

ITA-1

YELLOW

IC-4008A

C.S.America

CSA

BLACK

 

 

CSA-1

YELLOW

To upgrade quality, all electrical or mechanical parts and internal circuits are subject to change without notice or oblig- ation.

DANGER

NEVER connect the transceiver to an AC outlet or to a DC power supply that uses more than 5 V. Such a connection could cause a fire hazard and/or electric.

DO NOT expose the transceiver to rain, snow or any liquids.

DO NOT reverse the polarities of the power supply when connecting the transceiver.

DO NOT apply an RF signal of more than 20 dBm (100mW) to the antenna connector. This could damage the trans- ceiver's front end.

ORDERING PARTS

Be sure to include the following four points when ordering replacement parts:

1.10-digit order numbers

2.Component part number and name

3.Equipment model name and unit name

4.Quantity required

<SAMPLE ORDER>

0910049951

PCB B-5109B

IC-4008A

MAIN UNIT

5 pieces

8810009780 Screw

PH BO M2x6 ZK

IC-4008A

Chassis

10 pieces

Addresses are provided on the inside back cover for your convenience.

REPAIR NOTES

1.Make sure a problem is internal before disassembling the transceiver.

2.DO NOT open the transceiver until the transceiver is disconnected from its power source.

3.DO NOT force any of the variable components. Turn them slowly and smoothly.

4.DO NOT short any circuits or electronic parts. An insulated turning tool MUST be used for all adjustments.

5.DO NOT keep power ON for a long time when the transceiver is defective.

6.DO NOT transmit power into a signal generator or a sweep generator.

7.ALWAYS connect a 30 dB to 40 dB attenuator between the transceiver and a deviation meter or spectrum analyzer when using such test equipment.

8.READ the instructions of test equipment thoroughly before connecting equipment to the transceiver.

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Contents UHF FM Transceiver LPD FM Transceiver Repair Notes IntroductionOrdering Parts Table of Contents Section Specifications ITA, ITA-1 CSA, CSA-1Channel Frequency List Ctcss Frequency ListRF Unit Inside ViewsMain Unit Removing the Main Unit Disasembly InstructionsRemoving the Rear Panel Removing the RF UnitReceiver Circuits Antenna Switching Circuit RF UnitCircuit Description RF Circuit RF UnitTransmitter Circuits PLL Circuits RF UnitCPU Main unit IC1 Power Supply Circuits Voltage LinePort Allocations Preparation Section Adjustment ProceduresEntering the Adjustment Mode Required Test EquipmentAdjustment DeviationR50 C63R206 TestSection Parts List Order DescriptionRF Board Coil Eljre 18NG-F C211 4030006860 Cabinet Parts Chassis Parts Mechanical Parts and DisassemblyAccessories Unit abbreviation C Chassis PARTS, RF RF UNIT, M Main Unit Diodes SEMI-CONDUCTOR InformationTransistor and FET’S TOP View IC-4008A Board LayoutsMain Unit R58 Bottom View IC-4008AC55 C17 R23 C18 C52 PSC Batt MOD VOL GND RF Unit TOP ViewFI3 Bottom ViewBlock Diagram IC1Voltage Diagram DTA144EURF Unit 16, Kamihigashi, Hirano-ku, Osaka 547-0002, Japan 16, Kamihigashi, Hirano-ku, Osaka, 547-0002, Japan