Icom IC-F3GS Service Manual
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Icom IC-F3GS Service Manual

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SERVICE
MANUAL
VHF FM TRANSCEIVERS

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Summary of Contents for Icom IC-F3GS

  • 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 16 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 ‘ ‘ GENERAL • Frequency coverage : 136.000–150.000 MHz • Type of emission : 16K0F3E (W-type), 8K50F3E (N-type) : 32 ch (16 channels × 2 banks: 2-BANK version), 16 ch (16 channel version) • Number of channels •...
  • 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 FM IF IC (IC2: TA31136FN(D)) Crystal filter FI1: FL-311 [NARROW]...

  • Page 6: Disassembly Instruction

    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 Remove the bottom protective paper of spoge. 3 Connect one of UT-96, UT-105, UT-109, UT-110, UT-111, and UT-108 optional unit J5. 4 Replace the option cover to the chassis-hole. Option cover Option unit SPONGE Parts name : 1556 sponge...

  • Page 8: Receiver Circuits

    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: Preparation

    SECTION 5 ADJUSTMENT PROCEDURES 5-1 PREPARATION When you adjust the contents on page 5-5 or 5-6, SOFTWARE ADJUSTMENT, the optional CS-F3G ADJ ADJUSTMENT SOFTWARE (Rev. 1.0 or later), OPC-478 and a JIG CABLE (see illustration at page 5-2) are required. CLONING CABLE REQUIRED TEST EQUIPMENT EQUIPMENT...
  • Page 13 • ADJUSTMENT SOFTWARE'S SCREEN DISPLAY EXAMPLE CS-F3G ADJ Rev.1.0 File Option COM 1: OPEN Connect Reload (F5) Disp para TCXO [A / D] [D / A] BPF T1 : 114 72h 2 . 24V 7 . 41V BPF T2 : 96 60h 1 .
  • 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: Personal DO NOT transmit while computer SSG is connected to the antenna connector. to an RS-232C port OPC-478 Attenuator deviation meter...

  • Page 15: Pll Adjustment

    5-2 PLL ADJUSTMENT MEASUREMENT ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITIONS VALUE UNIT LOCATION UNIT ADJUST PLL LOCK • Operating frequency: 146.000 MHz MAIN Connect a digital multi 2.0 V MAIN VOLTAGE • Receiving meter to check point • 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: 146.000 MHz Loosely couple a frequnecy 146.00000 MHz FREQUENCY •...
  • 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: 146.000 MHz Connect a SINAD meter with an Minimum distortion SENSITIVITY •...
  • Page 18 SECTION 6 PARTS LIST [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 1130007610 S.IC µPD3140GS-E1 (DS8) 6200008580 S.COIL 0.30-1.4-6TL 32N 1110003490 S.IC TA31136FN (D,EL) 6200008500 S.COIL 0.30-1.3-6TL 28N 1110003780 S.IC NJM2902V-TE1 6200008280 S.COIL 0.30-1.7-7TL 50N 1130008090 S.IC BU4066BCFV-E1 6200008510 S.COIL 0.30-0.9-4TR 10.5N 1110001810 S.IC TA7368F (TP1)
  • Page 19 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 7030003680 S.RESISTOR ERJ3GEYJ 104 V (100 kΩ) R151 7030003640 S.RESISTOR ERJ3GEYJ 473 V (47 kΩ) ERJ3GEYJ 471 V (470 Ω) 7030003400 S.RESISTOR R152 7030003760 S.RESISTOR ERJ3GEYJ 474 V (470 kΩ) ERJ3GEYJ 470 V (47 Ω) 7030003280 S.RESISTOR R153 7030003760 S.RESISTOR...
  • Page 20 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION R241 7030003800 S.RESISTOR ERJ3GEYJ 105 V (1 MΩ) 4030006900 S.CERAMIC C1608 JB 1E 103K-T-A R242 7030003800 S.RESISTOR ERJ3GEYJ 105 V (1 MΩ) 4030011600 S.CERAMIC C1608 JB 1C 104KT-N R243 7030003800 S.RESISTOR ERJ3GEYJ 105 V (1 MΩ) 4550006150 S.TANTALUM ECST1CY105R R244...
  • Page 21 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION C156 4030011600 S.CERAMIC C1608 JB 1C 104KT-N C299 4030011340 S.CERAMIC C1608 CH 1H 471J-T-A C158 4550006200 S.TANTALUM ECST0JY106R C300 4030006860 S.CERAMIC C1608 JB 1H 102K-T-A C159 4030006850 S.CERAMIC C1608 JB 1H 471K-T-A C301 4030006860 S.CERAMIC C1608 JB 1H 102K-T-A...
  • Page 22 SECTION 7 MECHANICAL PARTS AND DISASSEMBLY [CHASSIS PARTS] [MAIN UNIT] REF. NO. ODER NO. DESCRIPTION QTY. REF. NO. ODER NO. DESCRIPTION QTY. 8210016750 2251-T front panel [F3GT] 2510001060 Speaker K036NA500-47 8210016740 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...
  • Page 23 MP37 (C) MP33 (C) MP2 (M) MP22 (C) MP18 (C) MP32 (C) MP32 (C) MP1 (M) MP31 (C) MP10 (C) IC-F3GS parts MP27 (C) SP1 (M) MP31 (C) MP4 (M) EP2 (M) MAIN unit MP1 (C) DS1 (M) MP3 (M)
  • Page 24 SECTION 8 SEMI-CONDUCTOR INFORMATION • TRANSISTOR AND FET’S 2SA1577 Q 2SC4116 GR 2SC4215 O 2SC5085 Y 2SK1069 4 (Symbol: HQ) (Symbol: LG) (Symbol: QO) (Symbol: MCY) (Symbol: FJ4) 2SK2973 2SK2974 3SK239 A 3SK293 DTA144 EU (Symbol: K1) (Symbol: K2974) (Symbol: XR) (Symbol: UF) (Symbol: 16) (top view)
  • Page 25 SECTION 9 BOARD LAYOUTS MAIN UNIT • TOP VIEW C156 C294 R135 C119 C122 C120 C282 C121 R142 C293 C303 C118 R253 C115 C300 C111 C280 C117 R264 R175 R185 C124 R177 C217 C131 C251 R162 R163 C148 R161 C136 R114 C205 C213...
  • Page 26 • BOTTOM VIEW R191 C201 C249 C155 C174 C221 R198 R190 R199 IC12 R200 C200 R261 C123 C158 R229 C198 C244 R230 R150 R231 IC10 R143 C173 R237 R236 C114 R245 R238 C229 R246 R223 C235 R234 R196 R140 C302 R267 R195 R265...
  • Page 27 SECTION 10 BlLOCK DIAGRAM J5 AXN330C038 D1: MA77 D3: MA77 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 PLL IC LOOP TX/RX...
  • Page 28 SECTION 11 VOLTAGE DIAGRAM AFOUT AFOUT DISCIN DISCIN OPV1 LVIN LVIN OPV2 OPV3 CIRQ BUSY OPT3 OPT2 AFOUT OPT1 VOLMIN to Optional unit DISCIN 7.23 V – R115 2SB1132 R SIGOUT 220 k 120 k R177 RXMUTE RMUTE TX: 0 V TX: 0 V CPU5 1.94 V...
  • Page 29 AFOUT AFOUT DISCIN DISCIN LVIN LVIN 10 k DBAL 33 P 100 k 470 k 47 k FRQCON 0.01 VOLMIN – VOLMAX 3.31 V C153 TA7368F 7.23 V – 7.07 V 2SB1132 R 1SV288 POUT TX: 0 V TX: 0 V PWGND RX: 4.62 V RX: 3.96 V...
  • Page 30 (LV check ponit) CR-664 (15.3 MHz) 47 k 33 P R185 56 P R175 C234 1SV288 0.001 TX: 0.97 V GND1 20 VCC1 IN2 19 RX: 1.03 V 2SK1069 4 VCC2 18 0.001 XB 17 4.72 V XI 16 XP6501 AB DATA C211 XO 15...
  • Page 31 SECTION 11 VOLTAGE DIAGRAM AFOUT AFOUT AFOUT DISCIN DISCIN DISCIN OPV1 LVIN LVIN LVIN OPV2 (LV check ponit) 10 k OPV3 DBAL CIRQ BUSY CR-664 (15.3 MHz) 100 k 470 k 47 k 33 P FRQCON OPT3 R185 OPT2 56 P AFOUT 0.01 OPT1...
  • Page 32 290-294 Albert Street, Brunswick, Victoria, 3056, Australia Phone : 03 9387 0666 Fax : 03 9387 0022 : http://www.icom.net.au Zac de la Plaine, Rue Brindejonc des Moulinais BP 5804, 31505 Toulouse Cedex, France 6F No. 68, Sec. 1 Cheng-Teh Road, Taipei, Taiwan, R.O.C.
  • Page 33 S-13605II-CD 6-9-16, Kamihigashi, Hirano-ku, Osaka, 547-0002, Japan © 1999 Icom Inc.

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