Inside Views, Main Unit, RF Unit | Icom IC-4008MKII instruction

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)
1st mixer
(Q2: 2SC4226)			PLL IC
(Q2: 2SC4226)			PLL IC
			(IC1: TB31202FN)
			VCO circuit
			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

Image 6

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

Contents

UHF FM Transceiver LPD FM Transceiver Introduction Ordering PartsRepair Notes Table of Contents Section Specifications ITA, ITA-1 CSA, CSA-1 Channel Frequency List Ctcss Frequency List Inside Views Main UnitRF Unit Removing the Main Unit Disasembly InstructionsRemoving the Rear Panel Removing the RF Unit Receiver Circuits Antenna Switching Circuit RF UnitCircuit Description RF Circuit RF Unit Transmitter Circuits PLL Circuits RF Unit Power Supply Circuits Voltage Line Port AllocationsCPU Main unit IC1 Preparation Section Adjustment ProceduresEntering the Adjustment Mode Required Test Equipment Adjustment Deviation R50 C63R206 Test Section Parts List Order Description RF 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-4008A C55 C17 R23 C18 C52 PSC Batt MOD VOL GND RF Unit TOP View FI3 Bottom View Block Diagram IC1 Voltage Diagram DTA144EU RF Unit 16, Kamihigashi, Hirano-ku, Osaka 547-0002, Japan 16, Kamihigashi, Hirano-ku, Osaka, 547-0002, Japan