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Icom IC-M402 Service Manual

Other manuals for IC-M402: Service Manual, Instruction Manual

Summary of IC-M402

  • Page 1

    Service manual vhf marine transceiver 1-1-32, kamiminami, hirano-ku, osaka, 547-0003, japan s-13716iz-cd © 2001 icom inc..

  • Page 2

    Introduction danger this service manual describes the latest service information for the ic-m402 vhf marine transceiver at the time of publication. 2 versions of the ic-m402 have been designed. This service manual covers each version. Model ic-m402 version usa usa-1 synbol black white ordering parts...

  • Page 3

    Section 1 specifications section 2 inside views 2-1 ic-m402 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1 2-2 hm-127 (optional unit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

  • 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: channels 3, 21, 23, 61, 64, 81, 82 and 83 cannot be used by the general public in usa waters. Can 21a 22a 23 24 25 26 27 28 60 61a 62a 64 64a 65a 66a* 1 67 68 69 70* 3 71 72 can 73 74 77* 1 78a 79a 80a 81a 82a 83 83a 84 85 86...

  • Page 6: Section 2

    Section 2 inside views 2 - 1 • main unit • front unit 2-1 ic-m402 reference oscillator (x2: cr-659) vco circuit fm if ic (ic1: ta31136fn) 2nd if filter (fi3: alfy450e) 1st mixer (q1:3sk272) antenna switching circuit 1st if filter (fi1,fi2,: fl-310) ygr amplifier (q11: 2sc3268) dsc decoder (ic6: njm2...

  • Page 7

    2 - 2 • top view • bottom view 2-2 hm-127 (optional unit) lcd (ds1: a0119) cpu (ic1: µ pd789405agk-a30-9eu) data buffer circuit system clock (x1: cstcc4.91mg) 8v regulator (ic6: ta7808f) dimmer circuit reset ic (ic7: s-80928anmp) mic amplifier (ic4: njm2125f) 5v regulator (ic5: ta78l05f) volume ic (...

  • Page 8: Section 3

    Section 3 disassembly instructions 3 - 1 • removing the case 1 unscrew 6 screws, a . Note: when replacing the screw, 10–12 kg of torque must be applied to ensure water resistance. • removing the main unit 1 unsolder dc cable (4 points) and antenna connector, b (2 points), as shown below. 2 unscrew 2...

  • Page 9: Section 4

    4 - 1 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. Received signals enter the main un...

  • Page 10

    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 (r101, c140). The de-emphasis circuit is ...

  • Page 11

    4 - 3 4-2-5 apc circuit (main unit) the apc circuit stabilizes transmit output power. The rf output signal from the power amplifier (ic3) is detected at the power detector circuit (d8, d9, l12) and is then applied to one of the differential amplifier inputs (q15, pin 5) via the high/low control circ...

  • Page 12

    4 - 4 4-3-4 vco circuit (main unit) the vco outputs from q4–q6 are buffer-amplified at the buffer amplifiers (q7 and q9), and are then sent to the tx/rx switch (d5 and d6). The receive lo signal is applied to the 1st mixer circuit (q1) through a low-pass filter, and the trans- mit signal is applied ...

  • Page 13

    4 - 5 pin port description number name pin port description number name 1 2 3 5 6 7 8 16 17 18 20 21 22 23 27 28 29 31 83 84 88 89 90 91 cont1 cont2 beep ch16 chwx h/l dsdec pck pstb pdata icfc bplvl eck eda hi/lo rrxd rrxd bpfv tmut nmeai wxdec sqlv sql lbat outputs control signal for the lcd contr...

  • Page 14

    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 more...

  • Page 15

    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 16

    5 - 3 5-4 receiver adjustments sensitivity squelch • operating channel : ch16 • [squelch] control : max. Counterclockwise • connect an ssg to the antenna connector and set as: frequency : 156.800 mhz level : 100 µv* (–67 dbm) modulation : 1 khz deviation : ±3.5 khz • receiving • operating channel : ...

  • Page 17

    5 - 4 + + j2 r71 output power adjustment [ptt] 4 1 r q r138 frequency deviation adjustment ac millivoltmeter 2 200 mv audio generator 300 hz to 3 khz r16 squelch level adjustment cp2 squelch level check point.

  • Page 18: Section 6

    [logic board] ic1 1140009410 s.Ic hd6433847ra29h (fx-2438a) ic2 1130009680 s.Ic hn58x2432ti ic3 1130007570 s.Ic bu4094bcfv-e2 ic4 1130005290 s.Ic tc74hc14af ic5 1130006080 s.Ic tc74hc02af (tp1) ic6 1130009110 s.Ic s-80942anmp-dd6-t2 ic7 1170000350 s.Ic pc357n6t q1 1590000720 s.Transistor dta144eua t...

  • Page 19

    [main unit] [logic board] s.=surface mount ep1 0910053453 pcb b 5584c ep2 8930054970 lcd contact srcn-2438-sp-n-w r1 7210002350 variable tp96n97n15f-10ka-1301 w1 8900010510 cable opc-1044 ep1 0910053462 pcb b 5585b r1 7210002360 variable tp96n97-15f-10kb-1301 ep1 0910053472 pcb b 5586b ic1 111000320...

  • Page 20

    S.=surface mount [main unit] [main unit] r28 7030003380 s.Resistor erj3geyj 331 v (330 Ω ) r29 7030003440 s.Resistor erj3geyj 102 v (1 k Ω ) r30 7030003200 s.Resistor erj3geyj 100 v (10 Ω ) r31 7030003480 s.Resistor erj3geyj 222 v (2.2 k Ω ) r32 7030003560 s.Resistor erj3geyj 103 v (10 k Ω ) r33 703...

  • Page 21

    [main unit] [main unit] s.=surface mount c22 4510004630 s.Electrolytic ecev1ca100sr c23 4030011810 s.Ceramic c1608 jb 1a 224k-t-n c24 4030006860 s.Ceramic c1608 jb 1h 102k-t-a c25 4030006860 s.Ceramic c1608 jb 1h 102k-t-a c26 4030006860 s.Ceramic c1608 jb 1h 102k-t-a c27 4030007170 s.Ceramic c1608 c...

  • Page 22

    S.=surface mount [front unit] [main unit] c196 4030006900 s.Ceramic c1608 jb 1e 103k-t-a c197 4010007630 ceramic hm60sj ch 270j 500v c198 4010008530 ceramic hm74sj ch 360j 500v c199 4030007090 s.Ceramic c1608 ch 1h 470j-t-a c200 4030009920 s.Ceramic c1608 ch 1h 050b-t-a c201 4030007020 s.Ceramic c16...

  • Page 23

    [main unit] s.=surface mount ic1 1140009280 s.Ic µpd78f9418agk-9eu (fx-2345d) ic2 1110001810 s.Ic ta7368f (tp1) ic3 1110004490 s.Ic m62429fp 700c ic4 1120002830 s.Ic njm2125f-te1 ic5 1180000420 s.Ic ta78l05f (te12r) ic6 1180001250 s.Ic ta7808f (te16l) ic7 1110004710 s.Ic s-80928anmp-ddr-t2 ic8 11300...

  • Page 24

    6 - 7 [main unit] s.=surface mount ds7 5040002310 s.Led sml-311ytt86 ds8 5040002310 s.Led sml-311ytt86 ds9 5040002310 s.Led sml-311ytt86 ds10 5040002310 s.Led sml-311ytt86 mc1 7700002480 microphone skb-2746 lpc s1 2260002140 s.Switch skqllc s2 2260002140 s.Switch skqllc s3 2260002140 s.Switch skqllc...

  • Page 25: Section 7

    7 - 1 section 7 mechanical parts and disassembly ref. No. Order no. Description qty. [chassis parts] ref. No. Order no. Description qty. [logic board] r1 7210002350 tp96n97n15f-10ka-1301 (incl. Nut) 1 ref. No. Order no. Description qty. [vr-a board] r1 7210002360 tp96n97n15f-10kb-1301 (incl. Nut) 1 ...

  • Page 26

    Mp18 (c) mp19 (c) mp11 (c) mp21 (c) mp19 (c) mp13 (c) mp13 (c) mp18 (c) mp18 (c) mp18 (c) mp18 (c) mp18 (c) mp4 (c) mc1 (f) r1 (va) r1 (vb) mp12 (f) mp12 (f) mp2 (f) mp6 (c) sp1 (f) vr-b board ep2 (l) ep2 (l) mp6 (f) mp6 (f) logic borad mp2 (l) vr-a board ds1 (l) mp1 (l) mp3 (l) mp14 (c) w3 (f) mp14...

  • Page 27

    7 - 3 7-2 hm-129 w1 8900010450 cable opc-1034 [black] 1 8900010460 cable opc-1035 [white] 1 mp1 8210017670 2352 front panel (b)-1 [black] 1 8210017680 2352 front panel (c)-1 [white] 1 mp2 8210016850 2352 rear panel [black] 1 8210017110 2352 rear panel (a) [white] 1 mp3 8930052160 2352 key 1 mp4 8930...

  • Page 28

    Section 8 semi-conductor information 8 - 1 • transistor and fet’s b c e b c e b c e c b e c 2sd1664 q (symbol: daq) fmw1 (symbol: w1) 2sc2714 y (symbol: qy) 2sb1132 r (symbol: bar) 2sc3268 (symbol: me) 2sb1143 s (symbol: b1143) 2sc3775 3 (symbol: oy3) 2sc4215 o (symbol: qo) 2sj144 y (symbol: vy) s d...

  • Page 29

    9 - 1 section 9 board layouts 9-1 vr-a board 9-2 vr-b board 9-3 hm-129 • top view • bottom view 1 b-5585b r1 w1 hv gnd vol2 vol1 hvs 5 w1 1 to main unit j5 1 w1 r1 b-5586b gnd sqlv 5v 3 w1 1 to main unit j5 r1 r2 r3 r4 c1 s4 s2 mc1 s3 s1.

  • Page 30

    9-4 logic board • top view 9 - 2 r79 r82 c14 r78 r47 r46 r26 r86 r87 c32 x1 r7 c24 ic6 r20 r17 ic2 q11 c28 r39 r42 r41 r6 r34 q5 q6 d2 r4 j1 j2 d1 c9 ic7 c6 c3 c5 c4 q9 r76 q10 q4 r2 r1 j4 r5 q8 c22 c23 r71 c31 r69 r68 r67 r66 r65 r64 r62 r63 r72 r53 r54 r52 r85 c18 c30 c8 r50 r51 r55 r56 r57 r58 r5...

  • Page 31

    9 - 3 • bottom view ds1 ds3 ds4 ds5 ds6 ds7 ds8.

  • Page 32

    9 - 4 9-5 main unit • top view c259 c109 c111 l14 c107 d10 c106 c197 c198 c102 c108 l13 c105 l11 l15 d15 mp1 l12 r71 [tx-pwr] fi1 fi2 cp2 [sql] r16 [ref] c36 cp1 [mod] r138 t5 r5 fi3 c80 c83 ext-mic d11 vr-a/b c185 c186 ic9 q12 cp3 b-5583c l19 c207 c202 d21 c211 c212 c253 r157 c214 c226 c213 c215 c2...

  • Page 33

    9 - 5 sp+ sp- r65 r154 c187 c118 c188 gnd to logic board j2 c115 c116 c271 c81 hv c85 c86 c87 c161 r126 c166 r133 r127 r128 c164 c165 r125 r129 r131 r132 c274 c273 r124 r130 r183 c162 r199 c160 r123 r198 c276 r121 c159 r201 r113 r122 c155 ic7 r150 r149 q26 d14 r134 c255 c262 c261 mp3 r168 r195 r196 ...

  • Page 34

    9-6 hm-127 (optional unit) • top view 9 - 6.

  • Page 35

    • bottom view 1 40 41 60 61 8 5 4 1 5 1 10 6 4 1 8 5 80 1 20 21 4 5 8 rrxda pwrc rtxda pttc gnd micg af/mic vcc 1 8 to ic-m402 main unit j2 and logic board j1 j1 9 - 7.

  • Page 36

    10 - 1 section 10 block diagram option external speaker hm-129 smart mic internal speaker mic mic ext.Sp sp main unit front unit wxdec dsdec q28: 2sc4116 bl ic6: njm2211m rcv send smute ic3: bu4094bcfv logic board vr-b board 5v sqlv x1: cr-691 9.8304mhz ds1: ttr5341 lcd buff dim ctrl lcd cont gate c...

  • Page 37

    11 - 1 section 11 voltage diagram 11-1 logic board r12 12 k q4 2sc4116 bl q2 2sc4116 bl q3 2sb1132 r r15 39 k r17 10 k r18 10 k r21 18 k r20 18 k dim3 dim2 ds7 fy1101 f-tr dim1 ds8 fy1101 f-tr r26 330 r13 3.3 k r14 1 k r16 47 k r19 18 k r22 18 k s5 s6 s7 s1 r1 100 k s2 r2 100 k s3 r3 100 k s4 band e...

  • Page 38

    11 - 2 11-2 main unit d16 1ss375 c228 470 p r158 22 c227 0.001 c226 470 p c252 0.001 r155 33 k l26 0.10 h r5 c5 0.001 r6 10 r12 1.5 k c20 100 p r14 1.2 k fi3 alfy450e cp2 c34 0.01 r25 100 l28 82 nh c258 9 p c259 9 p c260 0.001 c33 0.1 vcc1 1 in1 2 enb 3 clk 4 data 5 t1 6 lok 7 cp1 8 fi1 9 fo1 10 fo2...

  • Page 39

    11-3 hm-127 (optional unit) 11 - 3 j2 6 5 4 3 2 1 gnd rxd txd reset vpp 5v stxd srxd reset vpp 5v 5v srxd stxd 47k r55 1k r54 tc7w14fu ic8 8 7 6 5 4 3 2 1 2sa1576 q11 47 r58 4.7k r57 rrxda ptt 0.1 c46 2sc4081 q10 rtxda 27k r51 1k r56 5v 0.01 c45 0.027 c42 2sk1069 q9 s-80928anmp ic7 5 cd 4 nc 3 vss 2...

  • Page 40

    11 - 4 11-4 hm-129 chassis unit w1 to main unit j4 to logic board j3 ptt mic up dn 16/9 mc1 c1 470 p r1 12 k w2 w1 s1 s2 r2 6.8 k s3 r3 15 k r4 33 k s4 ptt micg mic gnd 1 2 3 4 ptt micg mic pttg keym gnd 1 2 up_on 2.0v dn_on 3.0v 16/9_on 3.8v.

  • Page 41

    Introduction danger this service manual describes the latest service information for the ic-m402 vhf marine transceiver at the time of publication. 2 versions of the ic-m402 have been designed. This service manual covers each version. Model ic-m402 version usa usa-1 synbol black white ordering parts...

  • Page 42: Service

    Service manual vhf marine transceiver 1-1-32, kamiminami, hirano-ku, osaka, 547-0003, japan s-13716iz-cd © 2001 icom inc..