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SERVICE
MANUAL
VHF FM TRANSCEIVERS
S-13605II-CD
6-9-16, Kamihigashi, Hirano-ku, Osaka, 547-0002, Japan © 1999 Icom Inc.
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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. Such a connection could cause a fire hazard and/or electric shock. DO NOT expose the transceiver to rain, snow or any liquids. DO NOT re
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TABLE OF CONTENTS SECTION 1 SPECIFICATIONS SECTION 2 INSIDE VIEWS SECTION 3 DISASSEMBLY AND OPTION INSTRUCTIONS 3-1 DISASSEMBLY INSTRUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 - 1 3-2 OPTIONAL UNIT INSTALLATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 - 2 SECTION 4 CIRCUIT DESCRIPTION 4-1 RECEIVER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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SECTION 1 SPECIFICATIONS Ô Ô GENERAL • Frequency coverage : 136.000–150.000 MHz • Type of emission : 16K0F3E (W-type), 8K50F3E (N-type) • Number of channels : 32 ch (16 channels · 2 banks: 2-BANK version), 16 ch (16 channel version) • Power supply requirement : 7.2 V DC (negative ground; supplied battery pack) • Current drain (approx.) : Transmit at High (5.0 W) 1.6 A at Low (1.0 W) 700 mA Receive rated audio 250 mA stand-by 70 mA • Frequency stability : ±0.0005 % • Usable temperature range : –
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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 APC (Q13: 3SK239A) IC3A: NJM2902V () Q37: DTA144EU FM IF IC (IC2: TA31136FN(D)) Crystal filter FI1: FL-311 [NARROW] IF amplifier () FL-312 [WIDE] (Q14: 2SC4215 O) PLL reference oscillator Mic amplifier circuit (X1: CR-664 15.3 MHz) VCO circuit PLL IC (IC1: μPD3140GS) D/A converter (IC10: M62363FP-560C) T
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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. C (nickel,2mm) x 2 Chassis B J6 (Speaker connector) A Front panel • REMOVING THE MAIN UNIT 1 Remove the searing rubber. 2 Unsolder 3 points D, and unscrew 1 nut E. 3 Unscrew 4 screws F and 5 screws G (silver, 2mm) to separate the c
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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 J5 SPONGE Parts name : 1556 sponge Order No. : 8930013545 3 - 2
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SECTION 4 CIRCUIT DESCRIPTION The signals from the RF circuit are mixed at the 1st mixer 4-1 RECEIVER CIRCUITS (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, l L2, C1–C5, C8). The filtered signals are applied to the ⁄4 The 1st IF signal is applied to a pair of crystal filters (FI1) to type antenna switching circuit (D2, D8). suppress out-of-band signals. The
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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). The output signals from pin 11 are applied to the AF pins 13, 14) via the mute switch (IC4, pins 4, 3). The filtered power amplifier (IC5, pin 4) after being passed through t
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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. HV The voltage from the attached battery pack. The same voltage as the HV line (battery volt- VCC age) which is controlled by the power swtich 4-3 PLL CIRCUIT ([VOL] control). A PLL circuit provides stable oscillation of the
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4-5 PORT ALLOCATIONS CPU (IC8)–continued 4-5-1 CPU (IC8) Pin Port Pin Port Description Description number name number name 1 VIN Input port for battely voltage detection. Input port for unlock signal. 63 UNLK High: PLL is unlocked. 9 RESET Input port for RESET signal. Low: PLL is locked. Outputs reference oscillator for the Output port for: 11 CSIFT CPU control signal. 90 MTONE Beep audio while receiving. 2/5-tone signals while transmitting. Outputs clock signal to the PLL IC 12 SCK (IC1), EEPRO
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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 CLONING CABLE and a JIG CABLE (see illustration at page 5-2) are required. n REQUIRED TEST EQUIPMENT EQUIPMENT GRADE AND RANGE EQUIPMENT GRADE AND RANGE Output voltage : 7.2 V DC Frequency range : 300–3000 Hz DC power supply Audio generator Current capacity : 5 A or more Output level : 1–500 mV Measuring ran
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• ADJUSTMENT SOFTWARE'S SCREEN DISPLAY EXAMPLE 2 CS-F3G ADJ Rev.1.0 File Option COM 1: OPEN Connect Reload (F5) Disp para TCXO 1 [D / A] [A / D] BPF T1 : 114 : 72h : 2 . 24V 3 VIN : : 189 BDh: 7 . 41V BPF T2 : 96 : 60h : 1 . 88V 13 TEMPS: : 186 BAh: 30 . 35'C BPF T3 : 101 : 65h : 1 . 98V 4 LVIN: : 98 62h: 1 . 92V T4/POW: : 99 63h: 1 . 94V REF : : 102 66h: 2 . 00V SD : : 0 00h: 0 . 00V DTCS BL: 140 : 8Ch : 54 . 90% REMOT: : 14 0Eh: 0 . 27V Dev : : 103 67h: 2 . 02V BDET: : 255 FFh:
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• 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 FM Attenuator deviation meter 40 dB or 50 dB RF power meter 0.1–10 W/50 Ω DB9 female plug (incl. level converter circuit) Frequency counter Speaker (8 Ω) to [SP] SINAD meter JIG cable • DC POWER CABLE CONNECTIONS SOFTWARE ADJUSTMENT PLL ADJUSTMENT + DC P
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5-2 PLL ADJUSTMENT MEASUREMENT ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITIONS VALUE UNIT LOCATION UNIT ADJUST PLL LOCK 1 • Operating frequency: 146.000 MHz MAIN Connect a digital multi 2.0 V MAIN L11 VOLTAGE • Receiving meter to check point LV. 2 • Transmitting 1.5–2.5 V Verify • MAIN unit RF power meter L11 PLL lock voltage adjustment LV PLL lock voltage check point Bottom view 5 - 4
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5-3 SOFTWARE ADJUSTMENT Select an operation using [› ] / [fl ] keys, then set specified value using [‹ ] / [fi ] keys on the connected computer keyboard. MEASUREMENT ADJUSTMENT ADJUSTMENT CONDITION VALUE UNIT LOCATION REFERENCE 1 • Operating frequency: 146.000 MHz Top Loosely couple a frequnecy 146.00000 MHz FREQUENCY • High/Low switch : Low panel counter to the antenna connec- [TXF] • Connect the RF power meter or 50 Ω tor. dummy load to the antenna connector. • Transmitting 2 • Transmitting 146.
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SOFTWARE ADJUSTMENT – continued Select an operation using [› ] / [fl ] keys, then set specified value using [‹ ] / [fi ] keys on the connected computer keyboard. MEASUREMENT ADJUSTMENT ADJUSTMENT CONDITION VALUE UNIT LOCATION RX 1 • Operating frequency: 146.000 MHz Top Connect a SINAD meter with an Minimum distortion SENSITIVITY • Connect a standard signal generator to panel 8Ω load to the [SP] jack. level [BPF T1] – the antenna connector and set as: [BPF T4] Frequency : 146.000 MHz Level : 3.2 µV
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SECTION 6 PARTS LIST [MAIN UNIT] [MAIN UNIT] REF ORDER REF ORDER DESCRIPTION DESCRIPTION NO. NO. NO. NO. IC1 1130007610 S.IC µPD3140GS-E1 (DS8) L1 6200008580 S.COIL 0.30-1.4-6TL 32N IC2 1110003490 S.IC TA31136FN (D,EL) L2 6200008500 S.COIL 0.30-1.3-6TL 28N IC3 1110003780 S.IC NJM2902V-TE1 L4 6200008280 S.COIL 0.30-1.7-7TL 50N IC4 1130008090 S.IC BU4066BCFV-E1 L5 6200008510 S.COIL 0.30-0.9-4TR 10.5N IC5 1110001810 S.IC TA7368F (TP1) L6 6200007730 S.COIL LQN21A 39NJ04 IC6 1180001740 S.IC TK11250BM
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[MAIN UNIT] [MAIN UNIT] REF ORDER REF ORDER DESCRIPTION DESCRIPTION NO. NO. NO. NO. R58 7030003680 S.RESISTOR ERJ3GEYJ 104 V (100 kΩ) R151 7030003640 S.RESISTOR ERJ3GEYJ 473 V (47 kΩ) R59 7030003400 S.RESISTOR ERJ3GEYJ 471 V (470 Ω) R152 7030003760 S.RESISTOR ERJ3GEYJ 474 V (470 kΩ) R61 7030003280 S.RESISTOR ERJ3GEYJ 470 V (47 Ω) R153 7030003760 S.RESISTOR ERJ3GEYJ 474 V (470 kΩ) R62 7030003680 S.RESISTOR ERJ3GEYJ 104 V (100 kΩ) R154 7030003760 S.RESISTOR ERJ3GEYJ 474 V (470 kΩ) R63 70300036
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[MAIN UNIT] [MAIN UNIT] REF ORDER REF ORDER DESCRIPTION DESCRIPTION NO. NO. NO. NO. R241 7030003800 S.RESISTOR ERJ3GEYJ 105 V (1 MΩ) C70 4030006900 S.CERAMIC C1608 JB 1E 103K-T-A R242 7030003800 S.RESISTOR ERJ3GEYJ 105 V (1 MΩ) C71 4030011600 S.CERAMIC C1608 JB 1C 104KT-N R243 7030003800 S.RESISTOR ERJ3GEYJ 105 V (1 MΩ) C72 4550006150 S.TANTALUM ECST1CY105R R244 7030003680 S.RESISTOR ERJ3GEYJ 104 V (100 kΩ) C73 4030011600 S.CERAMIC C1608 JB 1C 104KT-N R245 7030003680 S.RESISTOR ERJ3GEYJ 104 V (1
