Icom IC-4008MKII service manual Inside Views, Main Unit, RF Unit

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SECTION 2 INSIDE VIEWS

MAIN UNIT

TOP VEIW

BOTTOM VEIW

Audio amplifier (IC9: NJM2070M)

T+3 Regurator

 

EEPROM

 

 

(IC3: X24C01AS)

(Q28: 2SB798)

 

 

 

+3 Regurator

(IC6: S-81230SG) CPU

(IC1: PD753036GK)

R+3 Regurator (Q18: 2SA1586)

RF UNIT

 

TOP VIEW

 

 

 

Reference oscilletor

1st mixer

 

 

(X1: CR-633 21.25 MHz)

 

 

 

 

(Q2: 2SC4226)

 

 

PLL IC

 

 

 

 

 

(IC1: TB31202FN)

 

 

 

VCO circuit

 

 

 

 

 

 

 

 

RF amplifier

 

 

 

(Q3: 2SC5194)

BOTTOM VIEW

FM IF IC

(IC2: TA31136FN)

1st IF filter (Fl2: FL-298)

1st IF amplifier (Q1: 2SC4215)

2nd IF filter (Fl3: CFWM450E)

2 - 1

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Contents UHF FM Transceiver LPD FM Transceiver Introduction Ordering PartsRepair Notes Table of Contents Section Specifications ITA, ITA-1 CSA, CSA-1Channel Frequency List Ctcss Frequency ListInside Views Main UnitRF 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 UnitPower Supply Circuits Voltage Line Port AllocationsCPU Main unit IC1 Preparation Section Adjustment ProceduresEntering the Adjustment Mode Required Test EquipmentAdjustment DeviationR50 C63R206 TestSection Parts List Order DescriptionRF Board Coil Eljre 18NG-F C211 4030006860 Mechanical Parts and Disassembly AccessoriesCabinet Parts Chassis Parts Unit abbreviation C Chassis PARTS, RF RF UNIT, M Main Unit SEMI-CONDUCTOR Information Transistor and FET’SDiodes Board Layouts Main UnitTOP View IC-4008A 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