1. DL manuals
  2. Icom
  3. Transceiver
  4. IC-M302
  5. Service Manual

Icom IC-M302 Service Manual

Other manuals for IC-M302: Instruction Manual
Manual is about: ICOM IC-M302 Radio-Marine: Instruction Manual

Summary of IC-M302

  • Page 1

    Service manual vhf marine transceiver m302.

  • Page 2

    Introduction danger ordering parts repair notes this service manual describes the latest service information for the ic-m302 vhf marine transceiver at the time of publication. Never connect the transceiver to an ac outlet or to a dc power supply that uses more than 16 v. Such a connection could caus...

  • 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 transmiter circuits . . . . . . ....

  • Page 4: Section 1

    1 - 1 section 1 specifications ‘ ‘ general • frequency coverage : 156.025–157.425 mhz (tx) 156.050–163.275 mhz (rx) • mode : 16k0g3e (fm) 16k0g2b (dsc) • usable channels : all usa, international and canadian channels plus 10 weather channels • power supply requirement : 13.8 v dc ±10 % (negative gro...

  • Page 5

    1 - 2 * 1 low power only, * 2 momentary high power, * 3 receive only note: simplex channels 3, 21, 23, 61, 64, 81, 82 and 83 cannot be lawfully used by the general public in usa waters. Can 21a 21b 22a 23 24 25 25b 26 27 28 28b 60 61a 62a 64 64a 65a 66a* 1 67 68 69 can 70* 3 71 72 73 74 77* 1 78a 79...

  • Page 6: Section 2

    Section 2 inside views • main unit 2 - 1 • front unit af power amplifier (ic6: la4425a) antenna switch (d1, d2: xb15a308) pll ic (ic8: upd3140gs) reference oscillator (x2: cr-768) vco circuit crystal bandpass filter (fi, fi2: fl-363) ygr amplifier (q18: 2sc4226 r25) +5v regulator (ic9: ta7805s) pre-...

  • Page 7: Section 3

    Section 3 disassembly instructions 3 - 1 a a a e c e b d g f speaker to the dc power supply • removing the case 1 unscrew 8 screws, a, as shown below, and then remove the case in the direction of the arrow. • removing the main unit 1 unsolder the external speaker cable, f (2 points), and dc cable, g...

  • Page 8: Section 4

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

  • Page 9

    4 - 2 4-1-5 af amplifier circuit (main and front units) the af amplifier circuit amplifies the detected signals to drive a speaker. The af circuit includes an af mute circuit for the squelch. Af signals from ic1 (pin 9) are applied to the de-emphasis circuit (r61, c89). The de-emphasis circuit is an...

  • Page 10

    4 - 3 4-2-5 apc circuit (main unit) the apc circuit stabilizes transmit output power. The rf output signal from the power amplifier (ic4) is detected at the power detector circuit (d21, d22, l31) and is then applied to one of the differential amplifier inputs (q21, pin 3) via the high/low control ci...

  • Page 11

    4 - 4 4-3-4 vco circuit (main unit) the vco outputs from q13, q14 are buffer-amplified at the buffer amplifiers (q15 and q16), and are then sent to the tx/rx switch (d16 and d17). The receive lo signal is applied to the 1st mixer circuit (q2) through a low-pass filter, and the transmit signal is app...

  • Page 12

    4 - 5 pin port description number name pin port description number name 2 3 4 6 7 8 9 12 13 18 22 23 24 30 31 40 41 42 43 44 45 keym txdet sqlv pck pdata wxdec dscenc beep pstb eck dscdec unlk edata sql ptt scan ch/wx ch16 dn up dsc input port for the hm-141 key signals. Input port for the transmit ...

  • Page 13

    5 - 1 section 5 adjustment procedures 5-1 preparation ‘ ‘ required test equipment equipment dc power supply rf power meter (terminated type) frequency counter fm deviation meter dc voltmeter digital multi-meter distortion meter grade and range output voltage : 13.8 v dc current capacity : 10 a or mo...

  • Page 14

    5 - 2 5-2 pll adjustments lock voltage reference frequency adjustment adjustment adjustment condition measurement value point unit location unit adjust 1 2 1 • operating channel : ch16 • receiving • operating channel : ch16 • output power : low • transmitting • operating channel : ch16 • output powe...

  • Page 15

    5 - 3 5-3 transmitter adjustments output power frequency deviation adjustment adjustment adjustment condition measurement value point unit location unit adjust 1 1 • operating channel : ch16 • output power : high • transmitting • operating channel : ch16 • output power : low • connect an audio gener...

  • Page 16

    5 - 4 5-4 receiver adjustment sensitivity • operating channel : ch16 • [squelch] control : max. Counterclockwise • connect an ssg to the antenna connector and set as: frequency : 156.800 mhz level : 1 µv* (–107 dbm) modulation : 1 khz deviation : ±3.0 khz • receiving adjustment adjustment adjustment...

  • Page 17: Section 6

    [logic board] [vr board] r1 7210003140 variable tp96n97n-15sk-10ka-2685 t j1 6510009490 connector s5b-zr t ep1 0910056592 pcb b 6017b r1 7210003150 variable tp96n97-15sk-10kb-2685 t j1 6510009470 connector s3b-zr t ep1 0910056602 pcb b 6018b mc1 0800007150 microphone hm-141b acc [black] 0800007160 m...

  • Page 18

    [main unit] ic1 1110003490 s.Ic ta31136fn (d,el) t ic2 1110005320 s.Ic njm13403v-te1 t ic3 1110003650 s.Ic njm2211m-te1 t ic4 1150002170 ic s-av35 (i) t ic6 1110003090 ic la4425a t ic7 1140003830 s.Ic tc4w66f (te12l) t ic8 1130007610 s.Ic µpd3140gs-e1 (ds8) t ic9 1110002020 ic ta7805s t q1 158000054...

  • Page 19

    [main unit] r133 7030003680 s.Resistor erj3geyj 104 v (100 k Ω ) t r135 7310002670 s.Trimmer rv-143 (rh03a3as2) 471 t r136 7030003590 s.Resistor erj3geyj 183 v (18 k Ω ) t r137 7030003320 s.Resistor erj3geyj 101 v (100 Ω ) t r138 7030003560 s.Resistor erj3geyj 103 v (10 k Ω ) t r139 7030003360 s.Res...

  • Page 20

    [main unit] c166 4030006860 s.Ceramic c1608 jb 1h 102k-t t c167 4510005310 s.Electrolytic ecev1ca220sr t c171 4010008050 ceramic hm60sj ch 180j 500v t c172 4030006860 s.Ceramic c1608 jb 1h 102k-t t c173 4030006860 s.Ceramic c1608 jb 1h 102k-t t c174 4010005430 ceramic hm60sj ch 050c 500v t c175 4030...

  • Page 21

    [main unit] r1 7010007590 resistor rd1/4s 123jta t r2 7010007600 resistor rd1/4 682jta t r3 7010007610 resistor rd1/4 153jta t r4 7010007620 resistor rd1/4 333jta t c1 4030018660 s.Ceramic c1608 jb 1h 223k-t b c2 4030018670 s.Ceramic c1608 ch 1h 471j t mc1 7700002640 microphone kuc3523-040245 t s1 2...

  • Page 22: Section 7

    Section 7 mechanical parts and disassembly 7 - 1 ref. No. Order no. Description qty. R1 7210003150 tp96n97-15sk-10kb-2685 1 ref. No. Order no. Description qty. R1 7210003140 tp96n97-15sk-10ka-2685 1 j1 6510004880 connector mr-dse-01 1 w1 8900012330 cable opc-1258 1 mp2 8010019300 2685 chassis 1 mp3 ...

  • Page 23

    7 - 2 unit abbreviations (c): chassis parts, (l): logic board (m): main unit, (f): front unit (s): sql board, (v): vr board (a): accessories mp6(f) mp14(c) j1(c) mp7(c) w1(c) mp5(c) mc1(f) mp11(f) r1(s) r1(v) mp12(f) mp12(f) mp8(f) mp13(f) r1(v) mp5(f) sp1(f) mp6(c) mp1(f) mp11(c) mp16(c) mp4(c) mp1...

  • Page 24

    Mp1(c) mp10(c) mp3(c) mp7(c) mp6(c) mp9(c) mp2(c) w1(c) mc1(m) mp5(c) mp4(c) mp19(c) mp16(c) main unit mp15(c) mp14(c) mp13(c) mp13(c) mp15(c) mp8(c) mp17(c) hm–141 unit abbreviations (c): chassis parts, (m): main unit 7 - 3 w1 8900012211 cable opc-1249a [black] 1 8900012221 cable opc-1250a [white] ...

  • Page 25

    Section 8 semi-conductor information 8 - 1 • diodes • transistor and fet’s b e c e c b b e c b c e b e c e c b e c b b e c b e c b1 e b2 c1 c2 d s g1 g2 2sa1577 q (symbol: hp) 2sc4215 o (symbol: qo) 2sb1132 r (symbol: barb) 2sc4116 bl (symbol: ll) 2sc4226 r25 (symbol: r25) dta144eu (symbol: 16) dtc1...

  • Page 26

    C222 r164 c227 r163 r161 c221 c220 c230 c205 r151 c224 r168 r56 c83 r53 c93 ic7 c106 r65 c91 r69 r62 c105 r67 r226 c92 c273 r225 c296 c216 c198 c199 r222 r221 q31 c100 r73 r71 c96 c305 r123 c149 q18 q21 r122 l29 c145 c151 r110 c146 c140 r127 c161 c162 r143 r140 c176 r139 r138 c164 d21 d22 c122 c235 ...

  • Page 27

    • bottom view sp+ sp— hv gnd gray cable to the external speaker to the power supply blue cable red cable ic4 black cable out vcc2 vcc1 in 9 - 2.

  • Page 28

    9-2 logic unit • top view r25 r24 q3 q4 q2 c14 r56 r55 r53 c2 c1 c26 r61 r62 r43 c21 c31 r65 c32 r66 c43 r29 d3 r35 c41 ic2 r15 r14 c1 1 r30 r1 r3 r4 r5 c5 c4 r40 r42 r51 c7 r16 ic1 c25 r52 r41 be sp+ sp— b—6096a c18 ic4 ic6 c3 c22 j1 c23 ic5 r63 r64 d2 r37 c6 r38 q6 r36 x1 c17 d1 c16 j2 ic3 r28 r26...

  • Page 29

    • bottom view ds4 ds5 ds7 ds6 ds2 ds3 9 - 4.

  • Page 30

    J 1 r 1 1 5 hvs vol1 vol2 gnd hv j1 to the main unit w1 9-3 vr board • top view • bottom view 9 - 5.

  • Page 31

    J 1 r 1 1 3 sqli sqlv gnd j1 to the main unit w1 9-4 sql board • top view • bottom view 9 - 6.

  • Page 32

    9 - 7 r1 r3 r2 s2 s3 s4 r4 9-5 hm-141 • top view.

  • Page 33

    9 - 8 • bottom view c1 s1.

  • Page 34

    Section 10 block diagram 10 - 1 logic board main unit front unit vr board sql board x1 cr–769 7.9872 mhz ant lpf ant sw pre drive tx/rx sw xtal bpf ygr amp pwr amp noise amp noise det apc ctrl pwr ctrl lpf buff buff x2 cr–768 21.25 mhz fil loop lpf buff bpf sp1: 045p0803 ci–v i/f bpf ceramic bpf af ...

  • Page 35: Section 11

    11-1 general sp+ sp1 045p0803 sp– j1 30flt–sm–tb 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 j1 30flt–sm1–tb 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 w1 opc-1264 1 2 3 4 5 6 7 8 j1 b5b–zr 1 1 2 2 3 3 4 4 5 5 j1 b3b–zr 1 2 3...

  • Page 36

    11 - 2 11-2 main unit c100 0.1 r71 47 wxdec c96 0.1 c97 0.047 c99 0.033 ic3 njm2211m 1 v+ 2 in 3 lock 4 gnd 5 q 6 q data fsk 9 nc 10 ref 11 loop 12 r 13 cap 14 cap c95 10 c103 0.22 r73 47 k 7 8 c101 0.0022 r72 470 k r75 39 k r74 100 k r78 2.2 k c82 0.1 r53 100 k c83 0.0068 r55 10 k r56 10 k r57 10 k...

  • Page 37

    11-3 logic unit 11 - 3 ds3 sml–311yt ds2 sml–311yt ds4 fy1101–tr ds5 fy1101–tr ds6 fy1101–tr ds7 fy1101–tr r31 390 r30 390 r29 1 k c14 0.001 q4 2sc4116 bl r27 12 k q2 2sb1132 r r21 27 q3 2sc4116 bl r24 39 k r22 27 c12 0.001 c6 0.1 c13 0.01 r23 27 j2 b4b–zr–sm3–tf 1 2 3 4 5 6 nmea+ nmea– icf3 nmea+ n...

  • Page 38

    11-4 vr/sql board r1 tp96n97n–15sk–10ka–2685 j1 s5b–zr 1 2 3 4 5 1 2 3 4 5 vol1 vol2 gnd hv hvs vr board r1 tp96n97–15sk–10kb–2685 j1 s3b–zr 1 2 3 gnd sqlv sqli sql board 11 - 4.

  • Page 39

    11-5 hm–141 up on 2.0v dn on 3.0v 16/9 on 3.8v 1 1 2 2 3 3 4 4 5 5 ptt micg mic gnd keym chassis unit w1 mc1 kuc3523–040245 c1 0.022 c2 470 p r1 12 k w3 w4 s1 skhhlpa010 w2 w1 r2 6.8 k s4 skhhlpa010 r3 15 k r4 33 k s2 skhhlpa010 s3 skhhlpa010 up down h/l ptt mic 11 - 5.

  • Page 41

    1-1-32, kamiminami, hirano-ku, osaka, 547-0003, japan s-14011iz-c1 © 2003 icom inc..