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Icom IC-A14 Service Manual

Summary of IC-A14

  • Page 1

    S-14417xz-c1 jan. 2008 vhf air band transceiver.

  • Page 2

    This ser vice manual describes the latest ser vice information for the ic-a14 and ic-a14s vhf air band transceiver at the time of publication. Never connect the transceiver to an ac outlet or to a dc power supply that uses more than specifed. This will ruin the transceiver. Do not expose the transce...

  • Page 3

    Contents section 1 specifications section 2 inside views section 3 disassembly instruction section 4 circuit descripiton 4-1 receiver circuits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 4-2 transmitter circuits . . . . . . . . ....

  • Page 4: Section 1

    1 - 1 section 1 specifications p general • frequency coverage : ic-a14 tx 118.000 to 136.975 mhz rx 108.000 to 136.975 mhz wx (rx only) 161.650 to 163.275 mhz ic-a14s tx/rx 118.000 to 136.975 mhz • mode : 6k00a3e 16k0g3e (ic-a14/rx only) • channel spacing : 25 khz • number of memory channels : ic-a1...

  • Page 5: Section 2

    2 - 1 section 2 inside views discriminator (x4: jtbm450cx24) 1st if filter (fi3: fl-417) af power amp (ic31: tda8547ts) (top view) • pa unit af amp/filter (ic18: lmv324ipw) dac (ic17: m62363fp) 2nd if filter (fi2: cfwm450d) power amp (q2: rd12mvs1) tx and rx vcos cpu (ic26: upd780338) (top view) • m...

  • Page 6: Section 3

    3 - 1 section 3 disassembly instruction 1. Removing the front panel q remove the vr knob and antenna nut. W unscrew 2 screws from the bottom. E unscrew 2 screws from the side, and remove the jack panel. R take off the chassis assembly in direction of the arrow until the speaker cable appears. T disc...

  • Page 7: Section 4

    4 - 1 section 4 circuit description 4-1 receiver circuits rf circuits rf circuits consist of rf fi lters, antenna switch (ant sw), rf amplifi er (rf amp), etc., and extracts and amplifi es the signals of frequency which desired to receive. The received signals (rx signals) from the antenna are enter...

  • Page 8

    4 - 2 rx af circuits the rx af circuits consist of af fi lters, af amplifi ers, etc., and amplify, fi lter the demodulated af signals. The demodulated af signals from the if ic are passed through the am/fm sw (ic2), and applied to the buffer (ic18a). The af bufffer-amplified af signals are passed th...

  • Page 9

    4 - 3 4-2 transmitter circuits tx af circuits the tx af circuit consists of microphone amplifier (mic amp), alc and af fi lters. Alc (automatic level control) is an amplifi er which reduces its gain automatically to prevent over deviation. The audio signals from the connected headset's microphone (m...

  • Page 10

    4 - 4 4-3 frequency synthesizer circuits vco a vco is an oscillator whose oscillating frequency is determined by the applied volatge. This transceiver has two vcos; rx vco and tx vco. The rx vco generates the 1st lo signals for the 1st if signal produce, and tx vco generates tx signal. • rx vco (q58...

  • Page 11

    4 - 5 line name description in/ out status condition ptt ext. [ptt] input. In high while transmitting. (=[ptt] is pushed.) unlk pll unlock signal from the pll ic (ic29). In low while pll is unlocked. Sck clock signal to the dac (ic17). Out – – sdata serial data to the dac (ic17). Out – – rssi rssi v...

  • Page 12

    4 - 6 line name description in/ out status condition mmute mic mute sw (q51) control signal. Out low while tx af line is mute. Seg1– seg34 lcd (ds1) segments. Out – – com1– com4 lcd (ds1) common terminal. Out – – line name description t1 bpf tuning volatages. T2 t3 t4 modmax maximum deviation adjust...

  • Page 13: Section 5

    5 - 1 section 5 parts list m.=mounted side (t: mounted on the top side, b: mounted on the bottom side) [main unit] ref order description m. H/v no. No. Location ic1 1110007300 s.Ic njm2552v-te1 t 80/17 ic2 1130006221 s.Ic tc4w53fu (te12l,f) t 55/19.7 ic15 1110005310 s.Ic an6123ms b 59.2/10.8 ic17 11...

  • Page 14

    5 - 2 m.=mounted side (t: mounted on the top side, b: mounted on the bottom side) [main unit] ref order description m. H/v no. No. Location r226 7030005090 s.Res erj2gej 104 x (100 k) b 53.1/9 r227 7030005120 s.Res erj2gej 102 x (1 k) b 51/15.9 r228 7030005050 s.Res erj2gej 103 x (10 k) b 60.5/7.8 r...

  • Page 15

    5 - 3 m.=mounted side (t: mounted on the top side, b: mounted on the bottom side) [main unit] ref order description m. H/v no. No. Location c87 4030017460 s.Cer ecj0eb1e102k t 89.1/13 c90 4030017460 s.Cer ecj0eb1e102k t 84.3/13.4 c93 4030017460 s.Cer ecj0eb1e102k t 73.5/14.6 c95 4030016790 s.Cer ecj...

  • Page 16

    5 - 4 m.=mounted side (t: mounted on the top side, b: mounted on the bottom side) [main unit] ref order description m. H/v no. No. Location c753 4030016930 s.Cer ecj0eb1a104k b 58.1/41.7 c754 4550006250 s.Tan teesva 1a 106m8r t 100.1/24.7 c755 4030016930 s.Cer ecj0eb1a104k t 96.5/14.2 c756 403001768...

  • Page 17

    5 - 5 m.=moun [pa unit] ref order description m. H/v no. No. Location c717 4030017460 s.Cer ecj0eb1e102k t 20.3/21.9 c764 4030016930 s.Cer ecj0eb1a104k t 18.8/14 c765 4030017460 s.Cer ecj0eb1e102k b 11.6/15.5 c766 4030017460 s.Cer ecj0eb1e102k b 19.4/19.8 c770 4030017460 s.Cer ecj0eb1e102k b 5.9/14....

  • Page 18: Section 5

    Screw abbreviations a, b0, bt: self-tapping ph: pan head zk: black ni-zu: nickel-zinc sus: stainless 5 - 1 section 5 mechanical parts [chassis parts] ref order description qty. No. No. J1 6510026010 bnc-r170 1 j2 6910015860 imsa-6277s-o2a-g 1 sp1 2510001360 k036nax040a00-55 1 w1 8900009640 opc-963 1...

  • Page 19

    6 - 2 mp2* (c) mp33 (c) mp20 (c) sp1 (c) mp12* (c) main unit mp28 (c) mp8 (m) mp1 (m) mp7 (m) mp6 (m) ep20 (m) ds1 (m) mp5 (m) mp28 (c) mp28 (c) r824 (m) mp4 (m) mp28 (c) mp28 (c) j701 (p) j1 (dc) pa unit dc unit mp28 (c) ant unit mp1 (c) mp801 (a) mp17 (c) mp35 (c) j1 (c) mp8 (c) mp31 (c) mp13 (c) ...

  • Page 20: Section 7

    7 - 1 section 7 board layouts • main unit (top view) • pa unit (top view) • ant unit (top view) ic-a14 only ic-a14s ic-a14 • dc unit (top view) sp+ sp− sp1 (chassis) clone afout spg extsp micg mic j2 j5 exptt batt + j1 (chassis) batt – hv gnd lpf hv tx hv gnd txv refv t4 pow apc gnd rfdetv mod rx tx...

  • Page 21: • Main Unit

    7 - 2 s-14417xh-p2 printed in japan © 2008 icom inc. • main unit (bottom view) • pa unit (bottom view) • ant unit (bottom view) • dc unit (bottom view) intmic micg [mic] [sw/vol] [ptt] [light] [sp/clone] mc1 tx hv gnd txv refv t4 pow apc gnd rfdetv mod rx tx hv gnd txv refv t4 pow apc gnd rfdetv mod...

  • Page 22: Section 8

    8 - 1 section 8 block diagram ant lpf pll ic mic mut e matrix lcd eeprom ant sw pwr amp drive pre lpf buff buff fil loop fil ripple bpf rf amp bpf bpf xtal if amp if amp bpf ceramic fm det agc am p agc am p att matrix vol pwr amp buff lpf lpf buff vco sw buff ext mic battery pack 7.4v reset mic am p...

  • Page 23: Section 9

    *; refer to “parts list.” 9 - 1 section 9 voltage diagram sml-a12m t ds 2 0.001 c674 470p c691 1k r719 1k r734 100p c623 100p c637 [6] s13 ma2s111 *d72 0.001 c604 0.001 c632 1k r745 0.001 c602 [9] s17 ma2s111 *d70 [ent] s19 100p c639 [1 ] s7 0.47 c681 [7 ] s15 0.001 c683 0.001 c684 0.47 c679 1k r732...

  • Page 24

    9 - 2 *; refer to “parts list.” 0.001 c231 unr9210j q21 1 c202 r148 1k xp4315 q52 1 2 3 4 5 6 0.0022 c257 0.33 sva c168 560 r262 r216 47k r135 560 lmv324ipw ic18 13 12 14 r114 270 lmv324ipw ic18 9 10 8 1 c223 0.001 c313 0.001 c409 0 r253 10 msva c247 0.001 c269 0.001 c237 0.0047 c245 0.001 c51 r161 ...

  • Page 25: Pa Unit

    9 - 3 *; refer to “parts list.” 330k r293 r43 220k r53 220k r63 100 r69 1k r49 47 100 r335 0.001 c67 220k r311 r72 470 0.01 c97 330k r194 0. 1 c176 10p c85 r54 220k 0 r277 0.001 c82 r61 10k r48 330k 0.001 c328 0.001 c68 r64 100 0.001 c65 0.001 c84 0.001 c87 0.15u l82 0.001 c93 0.01 c95 r45 47k 0.001...

  • Page 26

    9 - 4 d2 ma2s728 r18 220 l4 0.82u d3 m a2s728 l8 27n 180 r843 rd12mvs1 q2 2.7k r323 l11 47n 22p c53 l3 52.0n l7 31.0n ma2s728 d74 10p c34 39p c212 39p c30 0.001 c765 r13 68k 33k r16 0.001 c770 0.001 c56 0.001 c766 rd01mus1 q3 0.001 c98 0.001 c9 3.3k r320 hvu13 1 d1 r15 39 4.7 r771 l46 23.5n hvu131 d...

  • Page 27

    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 fax : +33 (5) 61 ...

  • Page 28

    1-1-32, kamiminami, hirano-ku, osaka 547-0003, japan s-14417xz-c1 © 2008 icom inc..