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Icom IC-F43GS Service Manual

Summary of IC-F43GS

  • Page 1

    Service manual uhf transceivers f43gt/gs f44gt/gs.

  • Page 2

    Introduction danger ordering parts repair notes this service manual describes the latest service information for the ic-f43gt/gs and ic-f44gt/gs uhf trans- ceivers at the time of publication. Never connect the transceiver to an ac outlet or to a dc power supply that uses more than 8 v. Such a connec...

  • Page 3

    Table of contents section 1 specifications section 2 inside views section 3 disassembly instructions section 4 circuit descripiton 4-1 receiver circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 4-2 transmitter circuits . . . . . . ...

  • Page 4: Section 1

    ‘ ‘ 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 : • number of conventional channels : 256 ch, 16 banks • antenna impedance : 50 Ω • operating temperature range : –30˚c to +60˚c (–22˚f to +14...

  • Page 5: Section 2

    Section 2 inside views • main unit 2 - 1 • pa unit mute switch (d29: ma2s111) pll ic (ic21: lmx2352tm) base band ic (ic14: ak2346) eeprom (ic10: 24lc64t-i/sn) cpu (ic22: hd64f2238btf13) r5 regulator (q25: 2sa1577 q ) if ic (ic9: ta31136fn) af amplifier (ic15: ta7368f) apc amplifier (ic16: ta75s01f) ...

  • Page 6: Section 3

    Section 3 disassembly instructions 3 - 1 chassis unit e a b c d f shied cover main unit k k j j l j i g h chassis unit m n n • removing the chassis unit 1 unscrew 1 nut a , and remove 2 knobs b , c . 2 unscrew 2 screws d . 3 unscrew 2 screws e . 4 take off the chassis unit in the direction of the ar...

  • Page 7: Section 4

    4 - 1 section 4 circuit description 4-1 receiver circuits 4-1-1 antenna switching circuit (pa unit) the antenna switching circuit functions as a low-pass filter while receiving and a resonator circuit while transmitting. This circuit does not allow transmit signals to enter the receiver circuits. Re...

  • Page 8

    4 - 2 the 2nd if signal from the 2nd mixer (ic9, pin 3) passes through the ceramic filter (fi2) to remove unwanted hetero- dyned frequencies. It is then amplified at the limiter amplifi- er section (ic9, pin 5) and applied to the quadrature detec- tor section (ic9, pins 10, 11) to demodulate the 2nd...

  • Page 9

    4 - 3 posed of microphone amplifier, compressor, scrambler, lim- iter, splatter filter, msk modulator, etc. At the microphone amplifier section. The af signals (mic) from the microphone (mc1) are applied to the amplifier (ic23, pins 6, 7). The amplified sig- nals are applied to the microphone amplif...

  • Page 10

    4 - 4 (main unit; ic16; pin 3), and the “t2” signal from the d/a converter (main unit; ic12, pin 23), controlled by the cpu (main unit; ic22), is applied to the other input for reference. When antenna impedance is mismatched, the detected volt- age exceeds the power setting voltage. Then the output ...

  • Page 11

    4 - 5 4-5 other circuits 4-5-1 compander circuit (main unit) ic-f43gt/gs/f44gt/gs have compander circuit which can improve s/n ratio and become wide dynamic range. The cir- cuit is composed in the base band ic (ic14). (1) in case of transmitting the audio signals from the microphone are applied to t...

  • Page 12

    4 - 6 4-6-2 cpu (main unit; ic22) input port for the ptt switch detection signal. Low: while the ptt switch is pushed. Input port for the noise signal from the fm if ic (ic9, pin 13). Outputs serial data to the pll ic (ic21, pin 15) and d/a convertor (ic12, pin 8). Outputs serial clock signal to the...

  • Page 13

    5 - 1 section 5 adjustment procedures 5-1 preparation when adjusting ic-f43gt/f43gs/f44gt/f44gs, the optional cs-f33g adj adjustment software (rev. 1.0 or later), opc- 478 cloning cable (rs-232c type), opc-478u cloning cable (usb type) and a jig cable (see illustration at page 5-3) are required. ■ r...

  • Page 14

    5 - 2 q : transceiver’s connection state w : reload adjustment data e : receive sensitivity measurement r : connected dc voltage measurement t : pll lock voltage measurement y : operating channel select u : rf output power i : fm modulation balance (narrow) o : fm deviation (narrow) !0 : fm deviatio...

  • Page 15

    5 - 3 opc-478/opc478u jig cable to ic-f43g/f44g [sp] jack 3-conductor 3.5(d) mm (1⁄8") plug (sp + ) (clone) (gnd) (spe – ) fm deviation meter sinad meter speaker (8 Ω) audio generator ac millivoltmeter to the antenna connector attenuator 20 db or 30 db rf power meter 0.1–10 w/50 Ω frequency counter ...

  • Page 16

    Check the “lvin” item on the cs-f33g adj’s screen. Check the “lvin” item on the cs-f33g adj’s screen. Loosely couple the frequency counter to the antenna con- nector. Connect the rf power meter to the antenna connector. Connect the fm deviation meter with the oscilloscope to the antenna connector th...

  • Page 17

    5 - 5 *the output level of the standard signal generator (ssg) is indicated as the ssg’s open circuit. Software adjustment (receiving) • select an operation using [ ↑ ] / [ ↓ ] keys, then set specified value using [ ← ] / [ → ] keys on the connected computer keyboard. • need to adjust “s-meter adjus...

  • Page 18: Section 6

    [main unit] [main unit] ic6 1110006350 s.Ic lm2902pwr b 55.4/23.2 ic8 1110005770 s.Ic s-80942cnmc-g9c-t2 b 20.8/40.9 ic9 1110003200 s.Ic ta31136fn (el) t 81.5/16.4 ic10 1130011580 s.Ic 24lc64t-i/sn b 29.7/12.6 ic12 1190001350 s.Ic m62364fp 600d b 38.9/25.6 ic13 1130006220 s.Ic tc4w53fu (te12l) b 47....

  • Page 19

    6 - 2 [main unit] [main unit] r68 7030005050 s.Res erj2gej 103 x (10 k Ω ) b 84.7/15.3 r69 7030005040 s.Res erj2gej 472 x (4.7 k Ω ) b 85.6/17.6 r70 7030005530 s.Res erj2gej 100 x (10 Ω ) b 80.2/24.3 r71 7030005600 s.Res erj2gej 273 x (27 k Ω ) b 78.1/23.3 r72 7030005240 s.Res erj2gej 473 x (47 k Ω ...

  • Page 20

    6 - 3 [main unit] [main unit] r333 7030005050 s.Res erj2gej 103 x (10 k Ω ) b 5.3/21 r335 7030005050 s.Res erj2gej 103 x (10 k Ω ) b 5.3/20 r336 7030009710 s.Res erj2gej 203 x (20 k Ω ) b 7/26 r337 7030009710 s.Res erj2gej 203 x (20 k Ω ) b 7/25 r338 7030009710 s.Res erj2gej 203 x (20 k Ω ) b 7/24 r...

  • Page 21

    6 - 4 [main unit] [main unit] c148 4550006250 s.Tan teesva 1a 106m8l t 86.5/31.8 c149 4030017460 s.Cer ecj0eb1e102k t 67.2/7 c150 4030017490 s.Cer c1608 jb 1a 105k-t t 70.8/17.7 c151 4030017460 s.Cer ecj0eb1e102k b 24.4/14.5 c152 4030017420 s.Cer ecj0ec1h470j t 83.2/39.6 c153 4030017420 s.Cer ecj0ec...

  • Page 22

    6 - 5 [pa unit] [main unit] ds1 5010000160 s.Led lnj310m6ura t 57.3/5.4 ds2 5010000160 s.Led lnj310m6ura t 57.3/38.8 ds3 5030002760 lcd l3-0200hay-3 mc1 7700002480 mic skb-2746 lpc s1 2230001060 s.Sw evq-pul 02k t 102.2/37.5 s2 2260002840 sw skhllfa010 s3 2260002800 s.Sw sw-167 b 61.1/43.6 s4 226000...

  • Page 23

    6 - 6 [fuse unit] l901 6200008210 s.Col 0.45-1.5-5tl 23.2n t 8.1/5.8 l902 6200008210 s.Col 0.45-1.5-5tl 23.2n t 3/5.2 l903 6200008210 s.Col 0.45-1.5-5tl 23.2n t 11.7/6.7 c901 4030017460 s.Cer ecj0eb1e102k t 5.9/4.3 c902 4030017420 s.Cer ecj0ec1h470j t 8.4/8.6 c903 4030017460 s.Cer ecj0eb1e102k t 9.3...

  • Page 24: Section 7

    Section 7 mechanical parts and disassembly 7 - 1 sp1 2510001060 k036na500-47 1 w1 8900009640 opc-963 1 j1 6910015910 antenna connector 1 j2 6910015860 imsa-6277s-02a-g 1 mp1 8010019451 2721 chassis-1 1 mp2 8210020530 2721 t-front panel [f43gt/f44gt] 1 8210020730 2721 s-front panel [f43gs/f44gs] 1 mp...

  • Page 25

    7 - 2 unit abbreviation (c): chassis parts, (m): main unit mp2(c) mp25(c) mp30(c) mp29(c) mp33(c) mp20(c) sp1(c) mp12(c) main unit mp28(c) mp37(c) mp46(c) mp39(c) mp42(c) mp4(m) mp7(m) ds3(m) mp3(m) mp21(c) mp22(c) mp34(c) mp28(c) s27(m) r315(m) mp28(c) pa unit fuse unit mp28(c) ant unit mp1(c) j1(c...

  • Page 26

    Section 8 semi-conductor information 8 - 1 • diodes • transistor and fet’s 2sa1577 q (symbol: hp) xp1214 (symbol: 9h) rd01mus1 (symbol: k2) rd07mvs1 (symbol: rd07mvs1) unr9113j (symbol: 6c) unr9213j (symbol: 8c) unr9210j (symbol: 8l) xp6501 ab (symbol: 5n) 3sk299 u73 (symbol: u73) 2sc4226 r25 (symbo...

  • Page 27

    Mc1 ds2 ic20 ds1 c399 l42 q18 l47 l28 q19 c303 l48 l27 c150 ic9 q20 d8 c148 fi1 q4 cl1 q43 c333 j4 c79 c337 ic15 q42 q41 q46 ic16 d5 c325 c326 q3 l33 c17 ic21 s1 q22 l35 l43 q21 r305 r87 c400 c138 c155 r88 r89 r86 c145 r91 c132 r110 r308 r507 ep11 c417 r38 c188 r6 r227 c166 c163 r115 c161 c137 c323 ...

  • Page 28

    • bottom view 1 3 vcc gnd p_det j6 to the pa unit 15 1 pttin ptt out micout micin nc b usy nc sigout opt1 opt2 opt3 gnd opv3 opv2 opv1 16 30 gnd +5v vcc micmute afonop beepout rxmute discin afout rem ccs cirq so si sck j5 to the optional unit r131 c21 c25 c27 r302 c369 r13 r12 c40 c41 c209 r307 c116...

  • Page 29: •

    C725 c726 c727 c755 c712 c711 l704 d702 r702 c744 l709 c745 c708 c705 c701 r715 c732 ep712 q704 l707 q703 ep711 c763 c767 c766 c762 r712 c731 c735 l708 c760 c759 c733 c761 c758 c734 c718 r706 r704 mp701 l703 d705 c742 d701 0 5 10 15 20 25 5 15 20 25 30 35 0 40 ve rtical horizontal 9 - 3 9-2 pa unit ...

  • Page 30: •

    9 - 4 • bottom view • bottom view r726 c752 r701 c713 r727 c729 l705 r710 c723 q702 b6205a c712 c751 c753 d704 l701 c707 j702 r703 c754 d703 q701 r728 r708 j701 p_det gnd vcc c720 c756 c722 c715 c716 c719 c724 l706 f701 c757 c702 c703 l750 tx gnd 1 3 t5v apc tx j701 to the main unit vcc vcc to the f...

  • Page 31

    Section 10 block diagram 10 - 1 notes : contorol line common line tx line rx line data lime voltage line lpf lpf lpf ic6: njm12902 lpf ic19: njm12902 lpf ic6: njm12902v lpf ic6: njm12902v det pwr d702: rb706f mute sw d29: ma2s111 eeprom ic10: 24lc64t reset ic8: s-80942cnmc-g9c shift sw d6: ma77 ant ...

  • Page 32

    Section 11 voltage diagram 11-1 main unit r510 47 k r93 33 k r514 100 k +5v c35 0.0022 r512 8.2 k ic14 ak2346 9 10 11 12 24 23 22 21 agndin agnd txin txino limlv extlmin mod vss tclk tdata di/o rdf/fc test rxin rxino rxlpfo rxaf rxafin expout vdd xin xout dir sclk r513 47 k 24 23 22 21 20 19 18 17 1...

  • Page 33

    11 - 2 15.3 mhz 1.2vp-p t: 0.0 r: 4.8 t: 0.0 r: 0.3 t: 0.8 r: 1.2 t: 0.0 r: 4.8 t: 0.0 r: 4.8 t: 0.0 r: 0.9 t: 1.5 r: 1.6 t: 1.6 r: 1.4 c: 3.8 c: 3.9 t: 0.0 r: 2.0 t: 0.0 r: 4.6 t: 0.0 r: 4.4 t: 0.0 r: 1.8 t: 0.0 r: 0.6 c: 4.0 t: 0.0 r: 5.0 t: 0.0 r: 4.9 t: 5.0 r: 0.0 c: 5.0 t: 2.0 r: 0.0 c: 6.9 vcc...

  • Page 34

    11-2 pa / ant / fuse units t: 1.7 r: 0.0 t: 0.7 r: 0.0 t: 0.7 r: 0.0 t: 5.0 r: 0.0 t: 0.9 r: 0.0 t5v apc tx j701 imsa–6176s–03a vcc pdet gnd p_det gnd vcc c733 3 p c761 0.5 p q704 2sc5006 t5v c731 3 p c762 0.5 p c729 3 p q702 rd01mus1 l706 18 nh c720 39 p r704 10 c708 0.001 l703 0.4–0.9–2tl l704 0.4...

  • Page 35

    Asia icom inc. 6f no.68, sec. 1 cheng-teh road, taipei, taiwan, r.O.C. Phone : +886 (02) 2559 1899 fax : +886 (02) 2559 1874 url : http://www.Asia-icom.Com e-mail : sales@asia-icom.Com zac de la plaine, 1, rue brindejonc des moulinais bp 5804, 31505 toulouse cedex, france phone : +33 (5) 61 36 03 03...

  • Page 36

    1-1-32, kamiminami, hirano-ku, osaka, 547-0003, japan s-14108iz-c1 © 2004 icom inc..