Icom IC-F43GT Service Manual
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Icom IC-F43GT Service Manual

Icom IC-F43GT Service Manual

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SERVICE
MANUAL
UHF TRANSCEIVERS
F43GT/GS
F44GT/GS

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Summary of Contents for Icom IC-F43GT

  • Page 1 SERVICE MANUAL UHF TRANSCEIVERS F43GT/GS F44GT/GS...
  • Page 2 8. READ the instructions of test equipment thoroughly before connecting equipment to the transceiver. Icom, Icom Inc. and are registered trademarks of Icom Incorporated (Japan) in the United States, the United Kingdom, Germany, France, Spain, Russia and/or other countries.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS SECTION SPECIFICATIONS SECTION INSIDE VIEWS SECTION DISASSEMBLY INSTRUCTIONS SECTION CIRCUIT DESCRIPITON RECEIVER CIRCUITS ........... . . 4-1 TRANSMITTER CIRCUITS .
  • Page 4 SECTION 1 SPECIFICATIONS ‘ ‘ GENERAL • Frequency coverage : 400.000–470.000 MHz [USA], [EUR], [GEN] 450.000–512.000 MHz [USA] 450.000–520.000 MHz [GEN] • Mode : FM • Type of emission VERSION WIDE MIDDLE NARROW [USA], [GEN] 11K0F3E/ 8K50F3E(12.5 kHz) 16K0F3E (25.0 kHz) [EUR] 14K0F3E (20.0 kHz) 8K50F3E (12.5 kHz)
  • Page 5 SECTION 2 INSIDE VIEWS • MAIN UNIT TOP VIEW BOTTOM VIEW AF amplifier +5 Regulator APC amplifier (IC15: TA7368F) (IC17: NJM2870) (IC16: TA75S01F) IF amplifier Mute switch TX/RX switch (Q7: 2SC4215 O) (D29: MA2S111) IF IC D16: 1SV307 D17: MA2S077 (IC9: TA31136FN) VCO circuit PLL IC...

  • Page 6: Section 3 Disassembly Instructions

    SECTION 3 DISASSEMBLY INSTRUCTIONS • • REMOVING THE CHASSIS UNIT REMOVING THE PA UNIT 1 Unscrew 1 nut A, and remove 2 knobs B,c. 1 Unscrew 3 screws M. 2 Unscrew 2 screws D. 2 Unsolder 4 points N, and take off the PA unit in the direc- 3 Unscrew 2 screws E.

  • Page 7: Receiver Circuits

    SECTION 4 CIRCUIT DESCRIPTION 4-1 RECEIVER CIRCUITS 4-1-3 1ST MIXER AND 1ST IF CIRCUITS (MAIN UNIT) 4-1-1 ANTENNA SWITCHING CIRCUIT (PA UNIT) The 1st mixer circuit converts the received signal into fixed The antenna switching circuit functions as a low-pass filter frequency of the 1st IF signal with the PLL output frequency.

  • Page 8: Transmitter Circuits

    The 2nd IF signal from the 2nd mixer (IC9, pin 3) passes Some noise components in the AF signals from the FM IF IC through the ceramic filter (FI2) to remove unwanted hetero- (IC9, pin 9) are passed through the D/A converter (IC12, pin dyned frequencies.
  • Page 9 posed of microphone amplifier, compressor, scrambler, lim- The mixed siganls are applied to the D/A converter (IC12, iter, splatter filter, MSK modulator, etc. at the microphone pin 3, 4), and are then applied to the D12 in the VCO circuit. amplifier section.

  • Page 10: Pll Circuits

    (MAIN unit; IC16; pin 3), and the “T2” signal from the D/A 4-3-2 VCO CIRCUITS (MAIN UNIT) converter (MAIN unit; IC12, pin 23), controlled by the CPU The VCO circuits contains a separate RX VCO (Q17, D9, (MAIN unit; IC22), is applied to the other input for reference. D11) and TX VCO (Q16, D10, D12, D13).

  • Page 11: Other Circuits

    4-6 PORT ALLOCATIONS 4-5 OTHER CIRCUITS 4-6-1 D/A CONVERTOR IC (IC12) 4-5-1 COMPANDER CIRCUIT (MAIN UNIT) IC-F43GT/GS/F44GT/GS have compander circuit which can Port Description improve S/N ratio and become wide dynamic range. The cir- number name cuit is composed in the base band IC (IC14).
  • Page 12 4-6-2 CPU (MAIN unit; IC22) Port Port Description Description number name number name 13, 15, CENC0– Output the CTCSS/DTCS signals. Input port for the PTT switch detection CENC2 signal. Low: While switch Outputs the reference oscillator cor- pushed. recting voltage. The voltage is applied to the buffer amplifier (IC24, pin3).

  • Page 13: Section 5 Adjustment Procedures

    SECTION 5 ADJUSTMENT PROCEDURES 5-1 PREPARATION When adjusting IC-F43GT/F43GS/F44GT/F44GS, the optional CS-F33G ADJ (Rev. 1.0 or later), OPC- ADJUSTMENT SOFTWARE OPC-478U and a JIG CABLE (see illustration at page 5-3) are CLONING CABLE (RS-232C type), CLONING CABLE (USB type) required.
  • Page 14 • CS-F33G ADJ’S SCREEN EXAMPLE NOTE: The above values for settings are example only. Each transceiver has its own specific values for each setting. q: Transceiver’s connection state !1 : CTCSS/DTCS deviation w: Reload adjustment data !2 : Squelch level e: Receive sensitivity measurement !3 : Reference frequency r: Connected DC voltage measurement...
  • Page 15 • CONNECTION AC millivoltmeter To [MIC] Audio generator to the antenna connector Standard signal generator Personal 0.1 µV to 32 mV computer (–127 dBm to –17 dBm) CAUTION! DO NOT transmit while an SSG is connected to the antenna connector. OPC-478 to RS-232C port Attenuator...
  • Page 16 5-2 SOFTWARE ADJUSTMENT (TRANSMITTING) Select an operation using [↑] / [↓] keys, then set specified value using [←] / [→] keys on the connected computer keyboard. MEASUREMENT ADJUSTMENT ADJUSTMENT CONDITION VALUE UNIT LOCATION • Operating CH : CH1 Check the “LVIN” item on the 1.0 V PLL LOCK VOLTAGE...

  • Page 17: Software Adjustments

    SOFTWARE ADJUSTMENT (RECEIVING) • Select an operation using [↑] / [↓] keys, then set specified value using [←] / [→] keys on the connected computer keyboard. • Need to adjust “S-METER ADJUSTMENT” after “RX SENSITIVITY ADJUSTMENT” is adjusted. Otherwise, “S-METER ADJUSTMENT” will not be adjusted properly. MEASUREMENT ADJUSTMENT ADJUSTMENT CONDITION...

  • Page 18: Section 6 Parts List

    SECTION 6 PARTS LIST [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION LOCATION LOCATION 1110006350 S.IC LM2902PWR 55.4/23.2 2020001530 CER CFWLB450KFFA-B0 1110005770 S.IC S-80942CNMC-G9C-T2 20.8/40.9 1110003200 S.IC TA31136FN (EL) 81.5/16.4 IC10 1130011580 S.IC 24LC64T-I/SN 29.7/12.6 6070000190 S.DCR CDBCB450KCAY24-R0 80/16.3 IC12 1190001350 S.IC M62364FP 600D...
  • Page 19 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION LOCATION LOCATION 7030005050 S.RES ERJ2GEJ 103 X (10 kΩ) 84.7/15.3 R209 7030005240 S.RES ERJ2GEJ 473 X (47 kΩ) 51.2/17.2 7030005040 S.RES ERJ2GEJ 472 X (4.7 kΩ) 85.6/17.6 R210 7030005240 S.RES ERJ2GEJ 473 X (47 kΩ) 51.2/18.9 ERJ2GEJ 100 X (10 Ω) 7030005530 S.RES...
  • Page 20 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION LOCATION LOCATION R333 7030005050 S.RES ERJ2GEJ 103 X (10 kΩ) 5.3/21 4030017460 S.CER ECJ0EB1E102K 88.2/26.9 R335 7030005050 S.RES ERJ2GEJ 103 X (10 kΩ) 5.3/20 4030017460 S.CER ECJ0EB1E102K 90.5/31.3 R336 7030009710 S.RES ERJ2GEJ 203 X (20 kΩ) 7/26 4030017420 S.CER ECJ0EC1H470J...
  • Page 21 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION LOCATION LOCATION C148 4550006250 S.TAN TEESVA 1A 106M8L 86.5/31.8 C327 4030017330 S.CER ECJ0EF1C104Z 93.8/13 C149 4030017460 S.CER ECJ0EB1E102K 67.2/7 C328 4030017460 S.CER ECJ0EB1E102K 87.7/19.7 C150 4030017490 S.CER C1608 JB 1A 105K-T 70.8/17.7 C329 4030017460 S.CER ECJ0EB1E102K...
  • Page 22 [MAIN UNIT] [PA UNIT] ORDER ORDER DESCRIPTION DESCRIPTION LOCATION LOCATION 5010000160 S.LED LNJ310M6URA 57.3/5.4 C713 4030008560 S.CER C1608 CH 1H 300J-T 27/13.2 5010000160 S.LED LNJ310M6URA 57.3/38.8 C715 4030017460 S.CER ECJ0EB1E102K 15.4/13.1 5030002760 LCD L3-0200HAY-3 C716 4030017460 S.CER ECJ0EB1E102K 14.4/13.1 C718 4030017460 S.CER ECJ0EB1E102K 15.9/2.4...
  • Page 23 [FUSE UNIT] ORDER DESCRIPTION LOCATION L901 6200008210 S.COL 0.45-1.5-5TL 23.2N 8.1/5.8 L902 6200008210 S.COL 0.45-1.5-5TL 23.2N 3/5.2 L903 6200008210 S.COL 0.45-1.5-5TL 23.2N 11.7/6.7 C901 4030017460 S.CER ECJ0EB1E102K 5.9/4.3 C902 4030017420 S.CER ECJ0EC1H470J 8.4/8.6 C903 4030017460 S.CER ECJ0EB1E102K 9.3/8.6 C904 4030017420 S.CER ECJ0EC1H470J 12.5/9 C905...

  • Page 24: Mechanical Parts And Disassembly

    SECTION 7 MECHANICAL PARTS AND DISASSEMBLY 7-1 CABINET PARTS [MAIN UNIT] [ACCESSORIES] REF. NO. ORDER NO. DESCRIPTION QTY. REF. NO. ORDER NO. DESCRIPTION QTY. 5030002760 FX-2721 LCD 3310002291 FA-SC57U-1 0800007540 BP-231 ACC 8930063020 SRCN-2721-SP-N-W 8010019540 MB-94 ACC 6450001690 HSJ1456-01-220A 8210020560 2721 JACK PANEL 6450001680 HSJ1120-010010 8810004860 Screw M2 x 6 ZK R315...
  • Page 25 MP25 ( C ) SP1 ( C ) MP30 ( C ) MP13(C) MP29 ( C ) W1 ( C ) J1(C) MP36(C) MP2 ( C ) MP35(C) MP8(C) MP31(C) MP20 ( C ) MP33 ( C ) MP12 ( C ) MP1(C) MP12 ( C ) MP17(C)
  • Page 26 SECTION 8 SEMI-CONDUCTOR INFORMATION • TRANSISTOR AND FET’S 2SA1577 Q 2SB1132 Q 2SC3356 2SC4116 BL 2SC4215 O (Symbol: HP) (Symbol: BAQ) (Symbol: R22) (Symbol: LL) (Symbol: QO) 2SC4226 R25 2SC5006 2SK880 Y 2SK1829 2SK3019 (Symbol: R25) (Symbol: 24) (Symbol: XY) (Symbol: K1) (Symbol: KN) 3SK293...

  • Page 27: Section 9 Board Layouts

    SECTION 9 BOARD LAYOUTS 9-1 MAIN UNIT • TOP VIEW Horizontal OPT2 OPT1 C368 R303 R360 C140 C186 R173 C176 R172 R130 IC21 R305 R175 R111 C111 C193 C146 C135 R116 R165 C162 C143 C164 R127 R228 R229 C141 C329 C330 R100 IC20...
  • Page 28 • BOTTOM VIEW Horizontal R121 C136 R123 C142 C421 C171 C147 R103 IC19 IC23 R104 C159 C336 C347 R245 R185 C351 C208 R181 C345 C395 C225 R262 C206 R244 R257 R289 C380 R184 C205 C350 C114 C335 R240 R263 R256 C371 C180 R241...

  • Page 29: Pa Unit

    9-2 PA UNIT • TOP VIEW C766 C767 D705 C763 L707 C762 EP711 C742 Q703 R712 L703 D701 C731 C735 L708 C760 MP701 C759 C761 C733 R706 R704 Horizontal 9-3 ANT UNIT 9-4 FUSE UNIT • • TOP VIEW TOP VIEW J901 J901 J1(CHASSIS unit)
  • Page 30 • BOTTOM VIEW J702 to the MAIN unit to the FUSE unit ANT UNIT C752 L750 C712 J701 R726 to the MAIN unit R727 L705 C713 R701 C729 R710 C723 Q702 B6205A Horizontal • • BOTTOM VIEW BOTTOM VIEW 9 - 4...

  • Page 31: Block Diagram

    SECTION 10 BLOCK DIAGRAM 400-470 MHz 450-512 MHz Q20: Q18: XP1214 2SC4116 RX VCO Q19: UNR9213J Q17: 2SC4226 RIPPLE PA UNIT ANT UNIT D11: HVC350B CR-781 Q15: Q29: D16,D17: Q704: Q703: Q702: Q701: D702: IC24: 15.3 MHz 2SC5006 2SC5006 MA77 ×2 2SC5107 2SC3585 RD01MUS1...

  • Page 32: Voltage Diagram

    SECTION 11 VOLTAGE DIAGRAM 11-1 MAIN UNIT TONE EVQ–PUL 02K C131 0.1 @compC IC13 R514 R510 R120 R151 C170 TC4W53FU 100 k 47 k 47 k 47 k C136 100 P 33 k R122 R121 220 k R154 120 k EMER 68 k R291...
  • Page 33 [H]: High–band. [L]: Low–band. TPC6103 C: 4.0 RX VCO 2SC4116 BL C: 3.9 C404 0.01 CR–781 15.3MHZ C: 3.8 6.8 k 6.8 k R103 220 k IC24 VCON C126 R304 T: 2.0 2SK880 Y R104 100 k TA75S01F 12 P ERJ2GE–JPW R: 0.0 R516 100 k...

  • Page 34: Pa / Ant / Fuse Units

    11-2 PA / ANT / FUSE UNITS J1(CHASSIS) FUSE J901 9230B-1_02Z141-T (FUSE UNIT) L901 L903 VCC1 L709 23.2 nH 23.2 nH 14 nH L802 L801 C745 21.0 nH 15.0 nH 2.5 P L902 23.2 nH T: 1.7 R: 0.0 L706 18 nH T: 5.0 L704...
  • Page 35 E-mail : info@icomcanada.com Unit 9, Sea St., Herne Bay, Kent, CT6 8LD, U.K. Phone : +44 (01227) 741741 Fax : +44 (01227) 741742 Icom (Australia) Pty. Ltd. : http://www.icomuk.co.uk E-mail : info@icomuk.co.uk A.B.N. 88 006 092 575 290-294 Albert Street, Brunswick, Victoria, 3056, Australia Icom France S.a...
  • Page 36 S-14108IZ-C1 1-1-32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan © 2004 Icom Inc.

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