Icom IC-4008MKII - Manuals

Icom IC-4008MKII – Manual in PDF format online.

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Manual

Manual Icom IC-4008MKII

Summary

Page 2 - at the time of publication.; DO NOT expose the transceiver to rain, snow or any liquids.; using such test equipment.

INTRODUCTION DANGER ORDERING PARTS REPAIR NOTES This service manual describes the latest service informationfor the at the time of publication. NEVER connect the transceiver to an AC outlet or to a DCpower supply that uses more than 5 V. Such a connectioncould cause a fire hazard and/or electric. DO...

Page 3 - TABLE OF CONTENTS

TABLE OF CONTENTS SECTION 1 SPECIFICATIONS SECTION 2 INSIDE VIEWS SECTION 3 DISASEMBLY INSTRUCTION SECTION 4 CIRCUIT DESCRIPTION 4-1 RECEIVER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1 4-2 TRANSMITER CIRCUITS . . . . . . . . ...

Page 4 - RECEIVER

SECTION 1 SPECIFICATIONS 1 - 1 All stated specifications are subject to change without notice or obligation. Number of channels Type of emission Frequency stability Frequency resolution Power supply requirements (negative ground) Current drain Operating temperature range Number of CTCSS frequency Di...

Page 5 - OFF

CHANNEL FREQUENCY LIST CTCSS FREQUENCY LIST 123456789 10 11 121314151617181920212223 433.0750433.1000433.1250433.1500433.1750433.2000433.2250433.2500433.2750433.3000433.3250433.3500433.3750433.4000433.4250433.4500433.4750433.5000433.5250433.5500433.5750433.6000433.6250 242526272829303132333435363738...

Page 6 - MAIN UNIT; TOP VEIW; TOP VIEW

SECTION 2 INSIDE VIEWS 2 - 1 • MAIN UNIT • RF UNIT T+3 Regurator(Q28: 2SB798) +3 Regurator(IC6: S-81230SG) R+3 Regurator(Q18: 2SA1586) CPU(IC1: µ PD753036GK) Audio amplifier(IC9: NJM2070M) EEPROM(IC3: X24C01AS) TOP VEIW BOTTOM VEIW 1st mixer(Q2: 2SC4226) PLL IC(IC1: TB31202FN) 2nd IF filter(Fl3: CFW...

Page 7 - REMOVING THE REAR PANEL; Unscrew 1 screw; REMOVING THE RF UNIT; Remove the PTT rubber,

SECTION 3 DISASEMBLY INSTRUCTIONS 3 - 1 A B B MAIN unit RF unit E C D F H G • REMOVING THE REAR PANEL Unscrew 1 screw , and 4 screws . Remove the rear panel in the direction of the arrow. • REMOVING THE RF UNIT Remove 1 knob, , and unscrew 1 nut, . Unsolder 1 point, , and then remove the RF unit. • ...

Page 8 - -1 RECEIVER CIRCUITS; • 2nd IF AND DEMODULATOR CIRCUITS

4 - 1 SECTION 4 CIRCUIT DESCRIPTION 4-1 RECEIVER CIRCUITS 4-1-1 ANTENNA SWITCHING CIRCUIT (RF UNIT) Received signals from the antenna connector are passedthrough the low-pass filter (L5, L6, C8–C12). The filtered sig-nals are applied to the λ ⁄ 4 type antenna switching circuit (D7, D101, D102, L4, L...

Page 9 - • PLL circuit; -2 TRANSMITTER CIRCUITS; The modulated signal is applied to the drive amplifier circuit.

4 - 2 • PLL circuit Shift register Prescaler Phasedetector Loop filter Programmablecounter Programmabledivider X1 21.25 MHz to the FM IF IC (IC2, pin 1) VCO Buffer Q7 678 STB IC1 (PLL IC) CKDATA to transmitter circuit to 1st mixer circuit D2 D1 9 11 14 16 Q6, D4, D5 4-1-6 SQUELCH CIRCUIT (RF AND MAI...

Page 10 - -4 POWER SUPPLY CIRCUITS; VOLTAGE LINE

4 - 3 LINE BATT 3V +3V R+3 T+3 DESCRIPTION The voltage from the connected battery pack. Common 3 V converted from the BATT line atthe 3V regulator circuit (IC6). The circuit outputsthe voltage regardless of the power ON/OFFcondition. Common 3 V converted from the BATT line atthe +3V regulator circui...

Page 11 - REQUIRED TEST EQUIPMENT; EQUIPMENT; to the RF test port J1; ENTERING THE ADJUSTMENT MODE; Turn the transceiver power OFF.; CONNECTIONS

5 - 1 SECTION 5 ADJUSTMENT PROCEDURES 5-1 PREPARATION REQUIRED TEST EQUIPMENT EQUIPMENT DC power supply RF power meter(terminated type) Frequency counter FM deviation meter DC voltmeter GRADE AND RANGE Output voltage : 4.5 V DC Current capacity : 1 A or more Measuring range : 1 mW–1 W Frequency rang...

Page 13 - RF test por; TEST

5 - 3 RF GND J1 RF test por R50 FM deviati Reference frequencyadjustment R206 Output poweradjustment TEST C63 ENTERING THE ADJUSTMENT MODE q Turn the transceiver power OFF. w While connecting the "TEST" to GND, then turn power ON.

Page 18 - Screw abbreviations

SECTION 7 MECHANICAL PARTS AND DISASSEMBLY 7 - 1 Screw abbreviations A, B0, BT: Self-tappingPH: Pan headFH: Flat headBiH: Bind headNI: NickelSUS: StainlessZK: Black SP1 2510000960 Speaker K036NA500-26A27 1 EP1 3310002090 Antenna 2045ANT 1 MP1 8210015181 Panel 2045 Front Panel-1 [ITA], [CSA] 1 821001...

Page 20 - • DIODES

SECTION 8 SEMI-CONDUCTOR INFORMATION 8 - 1 • DIODES • TRANSISTOR AND FET’S 2SA1362 GR(Symbol: AEG) 2SC4213 B(Symbol: AB) 2SC5108 Y(Symbol: MC) DTA114 EU(Symbol: 16) UN5119(Symbol: 6K) UN9215(Symbol: 8E) DTC114 EU(Symbol: 14) MRF9745(Symbol: M745) UMZ1N(Symbol: Z1) UMZ2N(Symbol: Z2) 2SC5194(Symbol: T...

Page 26 - BOTTOM VIEW

9 - 6 • BOTTOM VIEW C79 C83 X1 C63 R52 R88 C15 C16 C69 C55 R36 C57 L14 C64 R34 C52 R31 C53 Q6 L13 R54 C50 R30 R29 C20 L11 D4 D5 R35 R33 L12 Q7 Q12 C84 C56 C51 R210 Q8 C60 FI1 FI2 W8 Q1 R3 R2 FI3 J1 R50 R206 C88 C85 R211 C211 L207 L105 L19 C102 R212 C21 C42 C100 R208 R6 C35 C45 R53 R55 R61 L21 R37 R3...

Page 27 - BLOCK DIAGRAM; CPU; RF UNIT

SECTION 10 BLOCK DIAGRAM 10 - 1 CTCIN D/A REMIN PTT2 MICSW RMUT AFON RXV TXV POWER LCD DS2 VOLTSENS RESET IC5 X2CDBCA450CX24(450 kHz) FI3: CFWM450E CERAMICBPF(450 kHz) FMDET S DET IFAMP NOISEDET IC2TA31136FN 2SC4215 Q13: 2SC4081Q14: 2SA1586D8 : 1SS355D9 : 1SS355 FL-298 Q6: 2SC5108D4,D5: 1SV284 X1CR-...

Page 28 - VOLTAGE DIAGRAM

SECTION 11 VOLTAGE DIAGRAM 11 - 1 11-1 MAIN UNIT LON: 0LOF: 3.02 LON: 2.82LOF: 0 C: 3.02 T: 3.04R: 2.40 C: 3.82 C: 3.10 C: 1.65 T: 0R: 0.86 C: 1.95 T: 0R: 2.97 C: 3.12 T: 0R: 3.02 C: 3.10 T: 1.58R: 0 T: 3.05R: 0 T: 1.46R: 0 C: 0 C: 3.12 T: 1.48R: 0 T: 1.45R: 0 C: 2.50 C: 3.13 T,SC: 0.49SO: 0.61 T: 0...