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SERVICE
MANUAL
VHF FM TRANSCEIVERS
S-13713IZ-C1V-q
1-1-32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan © 2000 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 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), 14K0F3E (M-type), 8K50F3E (N-type) Number of channels 100 ch (100 channel version), 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) at High 1.6 A TX at Low 700 mA Current drain (approx.) rated audio 250 mA RX stand-by 70 mA Frequency s
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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 [OTHER] IC3A: NJM2902V () () 3SK320 B Q37: DTA144EU Crystal filter FM IF IC FI1: FL-311 [OTHER] (IC2: TA31136FN(D)) FL-312 C FL-333 F, G () IF amplifier FL-334 E (Q14: 2SC4215 O) PLL reference oscillator X1: CR-664A 15.3 MHz [OTHER] Mic amplifier circuit () CR-671A 15.3 MHz A, D VCO
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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, 2 mm) x 2 Chassis B J6 (Speaker connector) A Front panel • REMOVING THE MAIN UNIT 1 Remove the searing rubber. 2 Unsolder 4 points D, and unscrew 1 nut E. 3 Unscrew 3 screws F and 6 screws G (silver, 2 mm) to separate th
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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 to J5. 3 Replace the option cover to the chassis-hole. Option cover Option unit J5 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 two crystal filters (FI1) to sup- type antenna switching circuit (D2, D8). press out-of-band signals. The filt
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4-1-5 AF CIRCUIT 4-2 TRANSMITTER CIRCUITS AF signals from the FM IF IC (IC2, pin 9) are applied to the 4-2-1 MICROPHONE AMPLIFIER CIRCUIT mute switch (IC4, pin 1) via the AF filter circuit (IC3b, pins 6, The microphone amplifier circuit amplifies audio signals with 7). The output signals from pin 11 are applied to the AF +6 dB/octave pre-emphasis characteristics from the micro- power amplifier (IC5, pin 4) after being passed through the phone to a level needed for the modulation circuit. [VOL] c
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The signal output from the power detector circuit (D32, D33) 4-4 POWER SUPPLY CIRCUITS is applied to the differential amplifier (IC3a, pin 2), and the VOLTAGE LINE “T4” signal from the expander (IC10, pin 11), controlled by LINE DESCRIPTION the CPU (IC8), is applied to the other input for reference. HV The voltage from the attached battery pack. When the driving current is increased, input voltage of the The same voltage as the HV line (battery volt- differential amplifier (pin 2) will be increa
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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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• Screen display exampe CS-F3G ADJ Rev.2.0 File Option 2 COM 1: OPEN Connect Reload (F5) Disp para TCXO 1 [A / D] [D / A] 4 VIN : 197 : C5h : 7.73 V BPF T1 : 90 : 5Ah : 1.76 V TEMPS : 190 : BEh : 32.23 'C BPF T2 : 45 : 2Dh : 0.88 V 3 5 LVIN : 98 : 62h : 1.92 V BPF T3 : 76 : 4Ch : 1.49 V SD : 0 : 00h : 0.00 V T4/POW : 60 : 3Ch : 1.18 V REMOT : 14 : 0Eh : 0.27 V REF : 112 : 70h : 2.20V BDET : 255 : FFh : 5.00 V DTCS BL. : 90 : 5Ah : 1.76 V Dev : 45 : 2Dh : 0.88 V SQL Lev : 0 : 00h : 1.18 V 6 CH
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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: DO NOT transmit while an SSG is connected to to an RS-232C port the antenna connector. Personal computer 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 to [SP] SINAD meter JIG cable Speaker (8 Ω) ¥ DC power cable connections PLL ADJUSTMENT SOFTWARE ADJUSTMENT +
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5-2 PLL ADJUSTMENT MEASUREMENT ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITIONS VALUE UNIT LOCATION UNIT ADJUST PLL LOCK 1 • Operating frequency : MAIN Connect a digital multi 2.0 V MAIN L11 VOLTAGE 136.000 MHz (L-band) meter to check point 146.000 MHz (H-band) LV. • Receiving 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: Top Loosely couple a frequnecy 136.00000 MHz FREQUENCY 136.000 MHz (L-band) panel counter to the antenna connec- (L-band) [TXF] 146.000 MHz (H-band) tor. 146.00000 MHz • High/Low switch : Low (H-band) • Connect the RF power meter or 50 Ω dummy load
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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: Top Connect a SINAD meter with an Minimum distortion SENSITIVITY 136.000 MHz (L-band) panel 8Ω load to the [SP] jack. level [BPF T1] – 146.000 MHz (H-band) [BPF T4] • Connect a standard signal generator to the antenna connector and set as: Frequenc
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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) D32 1790001670 S.DIODE RB706F-40T106 IC2 1110003490 S.IC TA31136FN (D,EL) D33 1790001670 S.DIODE RB706F-40T106 IC3 1110003780 S.IC NJM2902V-TE1 D34 1790000950 S.ZENER MA8056-M (TX) E only IC4 1130008090 S.IC BU4066BCFV-E1 IC5 1110001810 S.IC TA7368F (TP1) IC6 1110005350 S.IC NJM2870F05-TE1 D FI1 2010002430 S.XTAL FL-311 (31.05 MHz) [OTHER] 1180001740 S.
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[MAIN UNIT] [MAIN UNIT] REF ORDER REF ORDER DESCRIPTION DESCRIPTION NO. NO. NO. NO. R7 7030003320 S.RESISTOR ERJ3GEYJ 101 V (100 Ω) R86 7030003640 S.RESISTOR ERJ3GEYJ 473 V (47 kΩ) I R9 7030003560 S.RESISTOR ERJ3GEYJ 103 V (10 kΩ) 7030003670 S.RESISTOR ERJ3GEYJ 823 V (82 kΩ) [OTHER] R10 7030003250 S.RESISTOR ERJ3GEYJ 270 V (27 Ω) K R87 7030003400 S.RESISTOR ERJ3GEYJ 471 V (470 Ω) [OTHER] 7030003300 S.RESISTOR ERJ3GEYJ 680 V (68 Ω) A 7030003480 S.RESISTOR ERJ3GEYJ 222 V (2.2 kΩ) I 7030003310 S.
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[MAIN UNIT] [MAIN UNIT] REF ORDER REF ORDER DESCRIPTION DESCRIPTION NO. NO. NO. NO. R171 7030003640 S.RESISTOR ERJ3GEYJ 473 V (47 kΩ) R258 7030003620 S.RESISTOR ERJ3GEYJ 333 V (33 kΩ) R174 7030003580 S.RESISTOR ERJ3GEYJ 153 V (15 kΩ) R260 7030003560 S.RESISTOR ERJ3GEYJ 103 V (10 kΩ) R175 7030003440 S.RESISTOR ERJ3GEYJ 102 V (1 kΩ) R261 7030003560 S.RESISTOR ERJ3GEYJ 103 V (10 kΩ) R176 7030003510 S.RESISTOR ERJ3GEYJ 392 V (3.9 kΩ) R262 7030003440 S.RESISTOR ERJ3GEYJ 102 V (1 kΩ) [OTHER] R177 7
