Icom IC-F3GT Service Manual
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Icom IC-F3GT Service Manual

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SERVICE
MANUAL
VHF FM TRANSCEIVERS

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Summary of Contents for Icom IC-F3GT

  • Page 1 SERVICE MANUAL VHF FM TRANSCEIVERS...
  • Page 2 INTRODUCTION This service manual describes the latest service information for the IC-F3GT and IC-F3GS at the time of publication. 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 9 V.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS SECTION SPECIFICATIONS SECTION INSIDE VIEWS SECTION DISASSEMBLY AND OPTION INSTRUCTIONS DISASSEMBLY INSTRUCTION ..........3-1 OPTIONAL UNIT INSTALLATIONS .
  • Page 4 SECTION 1 SPECIFICATIONS ETS 300 086 EIA/TIA 603 Frequency coverage 136.000–150.000 MHz (L-band), 146.000–174.000 MHz (H-band) Type of emission 16K0F3E (W-type), 8K50F3E (N-type) Number of channels 100 ch (100 channel version, except ETS) , × 32 ch (16 channels 2 banks: 2-BANK version), 16 ch (16 channel version) Power supply requirement 7.2 V DC (negative ground;...
  • Page 5 SECTION 2 INSIDE VIEWS • MAIN UNIT TOP VIEW BOTTOM VIEW Antenna swtching circuit (D1, D2, D8: MA77) Power amplifier (Q1: 2SK2974) RF amplifier Low-pass filter circuit (Q12: 3SK293) 1st mixer (Q13: 3SK239A) IC3A: NJM2902V Q37: DTA144EU Crystal filter FI1: FL-311 [NARROW] FM IF IC FL-312 [WIDE] (IC2: TA31136FN(D))

  • Page 6: Disassembly And Option Instructions

    SECTION 3 DISASSEMBLY AND OPTION INSTRUCTIONS 3-1 DISASSEMBLY INSTRUCTION • REMOVING THE CHASSIS PANEL 1 Unscrew 1 nut A, and remove 1 knob B. 2 Unscrew 2 screws C. 3 Take off the chassis in the direction of the arrow. 4 Unplug J6 to separate front panel and chassis.

  • Page 7: Optional Unit Installations

    3-2 OPTIONAL UNIT INSTALLATIONS 1 Remove the option cover. 2 Connect one of UT-96, UT-105, UT-108, UT-109, UT-110, and UT-111 optional unit J5. 3 Replace the option cover to the chassis-hole. Option cover Option unit 3 - 2...

  • Page 8: Circuit Description

    SECTION 4 CIRCUIT DESCRIPTION 4-1 RECEIVER CIRCUITS The signals from the RF circuit are mixed at the 1st mixer (Q13) with a 1st LO signal coming from the VCO circuit to 4-1-1 ANTENNA SWITCHING CIRCUIT produce a 31.05 MHz 1st IF signal. Received signals are passed through the low-pass filter (L1, λ...

  • Page 9: Transmitter Circuits

    4-1-5 AF CIRCUIT The AF signals from the microphone are applied to the AF signals from the FM IF IC (IC2, pin 9) are applied to the microphone amplifier circuit (IC3c, pin 10). The amplified AF mute switch (IC4, pin 1) via the AF filter circuit (IC3b, pins 6, signals are passed through the low-pass filter circuit (IC3d, 7).

  • Page 10: Pll Circuits

    When the driving current is increased, input voltage of the 4-4 POWER SUPPLY CIRCUITS differential amplifier (pin 2) will be increased. In such cases, VOLTAGE LINE the differential amplifier output voltage (pin 1) is decreased LINE DESCRIPTION to reduce the driving current. The voltage from the attached battery pack.

  • Page 11: Port Allocations

    4-5 PORT ALLOCATIONS CPU (IC8)–continued 4-5-1 CPU (IC8) Port Port Description Description number name number name Input port for battely voltage detection. Input port for unlock signal. UNLK High: PLL is unlocked. RESET Input port for RESET signal. Low: PLL is locked. Outputs reference oscillator for the Output port for: CSIFT...

  • Page 12: Adjustment Procedures

    Measuring range : 10 mV–10 V SYSTEM REQUIREMENTS STARTING SOFTWARE ADJUSTMENT q Connect IC-F3GT/GS and PC with the optional OPC-478 • IBM PC compatible computer with an RS -232C serial port (38400 bps or faster). and the JIG cable. w Boot up Windows, and turn the transceiver power ON.
  • Page 13 : Receive sensitivity (manually) : Operating channel select : Reference frequency : RF output power : Adjustment items ¥ JIG cable — SPE) — GND) 3-conductor 3.5(d) mm plug to IC-F3GT/GS [SP] jack JIG cable OPC-478 CLONE) 5 - 2...
  • Page 14 • Connection Standard signal generator to the antenna connector to [MIC] 0.1 µV to 32 mV Audio generator (–127 dBm to –17 dBm) CAUTION: DO NOT transmit while an SSG is connected to to an RS-232C port the antenna connector. Personal computer OPC-478...

  • Page 15: Pll Adjustment

    5-2 PLL ADJUSTMENT MEASUREMENT ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITIONS VALUE UNIT LOCATION UNIT ADJUST PLL LOCK • Operating frequency MAIN Connect a digital multi 2.0 V MAIN VOLTAGE 136.000 MHz (H-band) meter to check point 146.000 MHz (H-band) • Receiving • Transmitting 1.5–2.5 V Verify •...

  • Page 16: Software Adjustment

    5-3 SOFTWARE ADJUSTMENT Select an operation using [↑] / [↓] keys, then set specified value using [←] / [→] keys on the connected computer keyboard. MEASUREMENT ADJUSTMENT ADJUSTMENT CONDITION VALUE UNIT LOCATION REFERENCE • Operating frequency: Loosely couple a frequnecy 136.00000 MHz FREQUENCY 136.000 MHz (L-band)
  • Page 17 SOFTWARE ADJUSTMENT – continued Select an operation using [↑] / [↓] keys, then set specified value using [←] / [→] keys on the connected computer keyboard. MEASUREMENT ADJUSTMENT ADJUSTMENT CONDITION VALUE UNIT LOCATION 1 • Operating frequency: Connect a SINAD meter with an Minimum distortion SENSITIVITY 136.000 MHz (L-band)
  • Page 18 SECTION 6 PARTS LIST [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 1130007610 S.IC µPD3140GS-E1 (DS8) 1110003490 S.IC TA31136FN (D,EL) 6050011070 S.XTAL CR-664A (15.300 MHz) [OTHER] 1110003780 S.IC NJM2902V-TE1 6050011120 S.XTAL CR-671A (15.300 MHz) 1130008090 S.IC BU4066BCFV-E1 6050010870 S.XTAL CR-663 (9.200 MHz) 1110001810 S.IC TA7368F (TP1) 6070000210 S.DISCRIMINATOR CDBCA450CX24...
  • Page 19 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 7030005120 S.RESISTOR ERJ2GEJ 102 X (1 kΩ) R121 7030003440 S.RESISTOR ERJ3GEYJ 102 V (1 kΩ) 7030003520 S.RESISTOR ERJ3GEYJ 472 V (4.7 kΩ) R122 7030003490 S.RESISTOR ERJ3GEYJ 272 V (2.7 kΩ) 7030003440 S.RESISTOR ERJ3GEYJ 102 V (1 kΩ) R123 7030003500 S.RESISTOR...
  • Page 20 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION R218 7030003690 S.RESISTOR ERJ3GEYJ 124 V (120 kΩ) 4030013850 S.CERAMIC ECUE1E102KBQ R219 7030003690 S.RESISTOR ERJ3GEYJ 124 V (120 kΩ) 4030013850 S.CERAMIC ECUE1E102KBQ R220 7030003730 S.RESISTOR ERJ3GEYJ 274 V (270 kΩ) 4030014020 S.CERAMIC ECUE1H020BCQ R221 7030003740 S.RESISTOR...
  • Page 21 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION C114 4030008900 S.CERAMIC C1608 JB 1C 333K-T-A C222 4030011600 S.CERAMIC C1608 JB 1C 104KT-N C115 4030006900 S.CERAMIC C1608 JB 1E 103K-T-A C223 4030006900 S.CERAMIC C1608 JB 1E 103K-T-A C224 4030006900 S.CERAMIC C1608 JB 1E 103K-T-A C116 4030007120 S.CERAMIC C1608 CH 1H 820J-T-A...
  • Page 22 [MAIN UNIT] ORDER DESCRIPTION 8900009640 CABLE OPC-963 7030003860 S.JUMPER ERJ3GE JPW V 7030003860 S.JUMPER ERJ3GE JPW V 0910051877 PCB B 5386G [OTHER] 0910053541 PCB B 5571A 8930051310 LCD CONTACT SRCN-2251-SP-N-W [CHASSIS UNIT] ORDER DESCRIPTION 4010000740 CERAMIC DD104 CH 150 J 50V only Ò: L-band, Ó: H-band, N: N-type, W: W-type e: ETS/CEPT version, u: EIA/TIA version, [100CH]: 100 ch.
  • Page 23 6 - 6...

  • Page 24: Mechanical Parts And Disassembly

    SECTION 7 MECHANICAL PARTS AND DISASSEMBLY [CHASSIS PARTS] [MAIN UNIT] REF. NO. ODER NO. DESCRIPTION QTY. REF. NO. ODER NO. DESCRIPTION QTY. 8210016540 2251 T-front panel [F3GT] 2510001060 Speaker K036NA500-47 8210016670 2251 S-front panel [F3GS] 8930050890 2251 terminal holder 8930051310 LCD contact SRCN-2251-SP-N-W 8010017990 2251 chassis 8210016570 2251 rear panel 8510011111 1922 VCO case-1...
  • Page 25 MP33 (C) MP26 (C) MP39 (C) MP32 (C) MP32 (C) MP23 (C) MP31 (C) MP4 (C) MP3 (C) MP15 (C) MP25 (C) MP2 (C) MP5 (C) MP12 (C) MP31 (C) MP14 (C) MP5 (M) MP36 (C) MP38 (C) MP8 (C) MP9 (C) MP31 (C) MP40 (C)

  • Page 26: Semi-Conductor Information

    SECTION 8 SEMI-CONDUCTOR INFORMATION • TRANSISTOR AND FET’S 2SA1577 Q 2SB1132 R 2SC4116 GR 2SC4215 O 2SC5085 Y (Symbol: HQ) (Symbol: BARB) (Symbol: LG) (Symbol: QO) (Symbol: MCY) 2SK1069 4 2SK2973 2SK2974 3SK239 A 3SK293 (Symbol: FJ4) (Symbol: K1) (Symbol: K2974) (Symbol: XR) (Symbol: UF) (top view)

  • Page 27: Board Layouts

    SECTION 9 BOARD LAYOUTS 9-1 ETS/CEPT VERSION • MAIN UNIT (TOP VIEW) C156 C294 R135 C119 C122 C120 C282 C121 R142 C293 C303 C118 R253 C115 C289 C300 C111 C280 C117 R264 R175 R185 C124 R177 C217 C251 C131 R162 R163 C148 R161...
  • Page 28 • MAIN UNIT (BOTTOM VIEW) R191 C201 C249 C155 C174 R206 R199 C221 R198 R190 IC12 R261 C123 C158 R200 R229 C244 R230 R150 R231 IC10 R143 C173 R237 R236 C114 R245 R238 C229 R246 R223 C235 R234 R196 R140 C302 R267 R195...

  • Page 29: Other Version

    9-2 OTHER VERSION • MAIN UNIT (TOP VIEW) C156 C294 R135 C119 C120 C122 C282 C121 R142 C293 C303 C118 R253 C115 C289 C300 C111 C280 C117 R264 R175 R185 C124 R177 C217 C131 C251 R162 R163 C148 R161 C136 R114 C205 C213...
  • Page 30 • MAIN UNIT (BOTTOM VIEW) R191 C201 C249 C155 C174 C221 R206 R199 R198 R190 IC12 R261 C123 R200 C158 R229 C244 R230 R150 R231 IC10 R143 C173 R237 R236 C114 R245 R238 C229 R246 R223 C235 R234 R196 R140 C302 R267 R195...

  • Page 31: Parts List

    SECTION 10 BC-137 OPTIONAL DESKTOP CHARGER INFORMASION 10-1 PARTS LIST 10-2 DISASSEMBLY INFORMATION [MAIN UNIT] REF. NO. ODER NO. DESCRIPTION QTY. 1520000650 S.TRANSISTOR 2SB1201-S-TL MP3 (C) 1590000480 S.TRANSISTOR RN2402 (TE85R) 1590000510 S.TRANSISTOR RN1409 (TE85R) 1530001950 S.TRANSISTOR 2SC2712-GR (TE85R) 1750000550 S.DIODE 1SS355 TE-17 1750000020 S.DIODE 1SS184 (TE85R)

  • Page 32: Voltage Diagram

    10-3 VOLTAGE DIAGRAM 12.49 V 12.47 V 13.80 V R1 24 R5 10 k 8.01 V 7.98 V 7.20 V D2 1SS184 2SB1201 S R2 24 CHARGE+ 11.82 V 11.80 V 13.63 V 12.46 V RN2404 TEMP DS1 TLG124A R4 10 k 0.23 V 1SS355 0.22 V...
  • Page 33 SECTION 11 BlLOCK DIAGRAM J5 AXN330C038 X1: CR-664A: [OTHER] CR-671A: D1: MA77 D3: MA77 (15.3 MHz) IC1: UPD3140GS D2: MA77 Q7: 2SC5085 Y D4: MA77 Q6: 2SC4215 O Q4: 2SC4215 O Q3: 2SC5085 Y Q2: 2SK2973 Q1: 2SK2974 D8: MA77 OPTION UNIT Q8: 2SC5085 Y 2TONE or 5TONE...
  • Page 34 SECTION 12 VOLTAGE DIAGRAM AFOUT AFOUT DISCIN DISCIN OPV1 OPV2 OPV3 CIRQ BUSY OPT3 OPT2 AFOUT OPT1 VOLMIN — DISCIN 7.23 V — 7 to Optional unit 2SB1132 R R115 SIGOUT 220 k 120 k R177 RXMUTE RMUTE TX: 0 V TX: 0 V 1.94 V CPU5...
  • Page 35 AFOUT AFOUT DISCIN DISCIN 10 k : [OTHER] 1 k : [L]-[W] DBAL CR-66 CR-67 (15.3 68 P 100 k 470 k 47 k FRQCON 0.01 VOLMIN — VOLMAX 3.31 V C153 7.23 V — 7.07 V TA7368F 2SB1132 R 1SV288 POUT TX: 0 V...
  • Page 36 R175 CR-664A: [OTHER] R185 CR-671A: C211 (15.3 MHz) 68 P 39 P C234 0.001 1SV288 (LV check ponit) TX: 0.97 V RX: 1.03 V GND1 20 VCC1 IN2 19 VCC2 18 0.001 XB 17 2SK1069 4 4.72 V XI 16 XP6501 AB DATA XO 15...
  • Page 37 SECTION 12 VOLTAGE DIAGRAM AFOUT AFOUT AFOUT DISCIN DISCIN DISCIN R175 OPV1 OPV2 10 k : [OTHER] 1 k : [L]-[W] OPV3 DBAL CR-664A: [OTHER] CIRQ CR-671A: R185 C211 BUSY (15.3 MHz) 100 k 470 k 47 k 68 P FRQCON OPT3 OPT2...
  • Page 38 1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan Phone : 06 6793 5302 : 06 6793 0013 : http://www.icom.co.jp/world/index.html < > Corporate Headquarters Communication Equipment 2380 116th Avenue N.E., Bellevue, WA 98004, U.S.A. Himmelgeister Str. 100, D-40225 Düsseldorf, Germany Phone : ( 425 ) 454-8155...
  • Page 39 S-13713IZ-CD 1-1-32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan © 2000 Icom Inc.

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