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Icom IC-M45 Service Manual

Other manuals for IC-M45: Service Manual
Manual is about: VHF MARINE TRANSCEIVER

Summary of IC-M45

  • Page 1

    Service manual vhf marine transceiver 6-9-16, kamihigashi, hirano-ku, osaka, 547-0002, japan s-13611iz-cd © 2000 icom inc..

  • Page 2

    Introduction danger this service manual describes the latest service information for the ic-m45/ic-m45euro vhf marine transceiver at the time of publication. 2 versions of the ic-m45/ic-m45euro have been designed. This service manual covers each version. Model ic-m45 ic-m45euro version u.S.A. U.S.A....

  • Page 3

    Section 1 specifications vhf marine channel list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2 section 2 disassembly instructions section 3 circuit description 3-1 receiver circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

  • Page 4: Section 1

    1 - 1 section 1 specifications ‘ ‘ general • frequency coverage : 156.025–157.425 mhz (tx) 156.025–163.275 mhz (rx) • mode : 16k0g3e (fm) • usable channels : • power supply requirement : 13.8 v dc ±15% (negative ground) • usable temperature range : –20˚c to +60˚c; –4˚f to +140˚f • frequency stabilit...

  • 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

    2 - 1 section 2 disassembly instructions • removing the case 1 unscrew the 4 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 (2 points) and antenna connector, b (3 points), as shown below. 2 unscr...

  • Page 7: Section 3

    Section 3 circuit description 3 - 1 3-1 receiver circuits 3-1-1 antenna switching circuit 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...

  • Page 8

    3 - 2 3-1-6 squelch circuit a squelch circuit cuts out af signals when no rf signals are received. By detecting noise components in the af signals, the squelch circuit switches the af mute switch. A portion of the af signals from the fm if ic (ic1, pin 9) pass through the [squelch] control pot, and ...

  • Page 9

    3 - 3 3-3 pll circuits 3-3-1 general the pll circuit provides stable oscillation of the transmit fre- quency and receive 1st lo frequency. The pll circuit com- pares the phase of the divided vco frequency to the refer- ence frequency. The pll output frequency is controlled by a crystal oscillator an...

  • Page 10

    3 - 4 description outputs the r5 regulator (q19, q20) control signal. Low : while receiving outputs the t5 regulator (q17, q18) control signal. Low : while transmitting output port fo rf output power (high or low) select signal. Low : while low power is selected outputs the reset signal for optional...

  • Page 11

    4 - 1 section 4 adjustment procedures 4-1 preparation ■ required test equipment equipment dc power supply rf power meter (terminated type) frequency counter fm deviation meter dc voltmeter grade and range output voltage : 13.8 v dc current capacity : 10 a or more measuring range : 1–50 w frequency r...

  • Page 12

    4-4 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 : 10 µv* (–97 dbm) modulation : 1 khz deviation : ±3.5 khz • receiving 4-3 transmitter adjustments 4-2 pll ad...

  • Page 13

    4 - 3 to dc cable dc power supply 13.8 v /15 a – + – + black red r70 r71 j2 j2 r130 c117 l5 l6 cp1 cp3 cp2 l7 output power adjustment for [high] frequency deviation adjustment l12 l13 pll lock voltage adjustment for [tx] pll lock voltage check point for [rx] pll lock voltage check point for [tx] sen...

  • Page 14: Section 5 Parts List

    S.=surface mount ic1 1530007220 s.Ic m38223m4-432-hp fx-2040 ic2 1110003500 s.Ic s-80742sl-a6-t1 ic3 1130007390 s.Ic tc7w02f (te12l) ic4 1140005620 s.Ic x25080si-2.7t6 q1 1530001950 s.Transistor 2sc2712-gr (te85r) q2 1510000500 s.Transistor 2sa1162-gr (te85r) q3 1530001950 s.Transistor 2sc2712-gr (t...

  • Page 15

    [main unit] [main unit] s.=surface mount q8 1530002600 s.Transistor 2sc4215-o (te85r) q9 1530002600 s.Transistor 2sc4215-o (te85r) q10 1530002240 s.Transistor 2sc3775-3-tb q11 1530002340 s.Transistor 2sc2954-t2b q12 1520000380 transistor 2sb1143 s q13 1590000670 s.Transistor fmw1 t148 q14 1590000420...

  • Page 16

    [main unit] [main unit] s.=surface mount r89 7030003480 s.Resistor erj3geyj 222 v (2.2 k Ω ) r90 7030003560 s.Resistor erj3geyj 103 v (10 k Ω ) r91 7030003480 s.Resistor erj3geyj 222 v (2.2 k Ω ) r92 7030003550 s.Resistor erj3geyj 822 v (8.2 k Ω ) r93 7030003440 s.Resistor erj3geyj 102 v (1 k Ω ) r9...

  • Page 17

    [main unit] [main unit] s.=surface mount c96 4550002830 s.Tantalum tesvd2 1v 685m-12r c97 4030006860 s.Ceramic c1608 jb 1h 102k-t-a c98 4510004590 electrolytic 16 mv 470 hc c99 4030006860 s.Ceramic c1608 jb 1h 102k-t-a c100 4030011290 s.Ceramic grm42-6 ch 240j 500pt c101 4030006860 s.Ceramic c1608 j...

  • Page 18: Section 6

    Section 6 mechanical parts and disassembly 6 - 1 j1 6510004880 connector mr-dse-01 1 mc1 0800004370 microphone hm-117b [black] 1 0800004380 microphone hm-117w [white] 1 sp1 2510001040 speaker f45g07-4 1 w1 8900007770 cable opc-754 [usa] 1 8900007930 cable opc-773 [eur] 1 mp2 8010017264 2040 chassis-...

  • Page 19

    Mc1 (c) mp10 (c) mp5 (c) r1 (va) r1 (vb) mp6 (c) mp8 (c) mp15 (c) sp1 (c) vr-a unit mp20 (c) mp20 (c) mp4 (c) ep2 (l) mp17 (c) mp17 (c) logic unit mp2 (l) ds3 (l) ds2 (l) vr-b unit ds1 (l) mp1 (l) mp21 (c) mp16 (c) mp16 (c) mp3 (m) mp16 (c) mp18 (c) w3 (l) ic2 (m) mp12 (c) mp3 (c) mp7 (c) j1 (c) w1 ...

  • Page 20

    Section 7 semi-conductor information 7 - 1 b c e b c e b c e c d g s s d g d g s d s g1 g2 e e b c b c b e c b e c • transistor and fet’s 2sa1162 gr (symbol: sr) 2sb1132 q (symbol: baq) 2sb1132 r (symbol: bar) 2sb1143 s (symbol: b1143) 2sc2712 gr (symbol: lg) 2sc2712 y (symbol: ly) 2sc2714 y (symbol...

  • Page 21: Section 8

    Section 8 board layouts 8-1 logic, vr-a and vr-b units 8-1-1 top view • logic unit 8 - 1 ds2 ds3 q5 c20 c21 r26 r23 r33 r31 r32 c19 r29 r34 r2 r1 c5 r16 c9 c18 r14 r1 1 c6 r6 r13 r9 r7 r17 c8 r12 r10 c17 c1 r4 c2 r5 c7 r8 r15 r20 r21 r24 c15 r25 r22 c16 r30 c14 c4 c3 c13 r3 r27 c1 1 r28 c12 r19 r18 ...

  • Page 22

    8 - 2 8-1-2 bottom view • logic unit • vr-b unit • vr-a unit.

  • Page 23

    8 - 3 c164 j2 1 j3 c163 q12 c145 ic8 c135 ic6 ic10 ic5 c172 c157 q22 q21 q19 ic3 x1 fi2 c152 c151 c156 q20 q18 l19 d10 c1 17 q17 l15 l14 q7 d7 d18 d6 d19 d8 q8 c59 l13 l12 q5 q4 q14 l20 d17 q1 1 c96 q15 q13 q16 d11 r71 d12 q23 l21 r70 c98 l22 w1 w2 d13 l1 l25 l3 d1 l5 l6 l7 x2 c44 j1 1 fe1b fi1a l26...

  • Page 24

    8 - 4 c1 c3 c2 c5 c9 c7 c6 c8 c100 c102 c11 c4 c178 c199 c182 c175 c200 c206 c190 c184 r157 c10 c99 r69 c97 r57 c87 r59 r58 c88 r3 c12 r55 r46 r65 r141 c78 c86 r54 r1 r4 r15 c21 c74 r40 c73 r39 c72 r36 r18 r38 r20 c39 r23 r26 r27 c55 c43 c51 r44 r45 c50 r24 r37 r19 c38 c37 c35 r7 c25 c34 r14 c33 c23...

  • Page 25: Section 9

    Section 9 block diagram 9 - 1 sp fm det ic1: ta31136fn (d) 2nd mix q3: 2sc2714 y 2nd if amp q2: 3sk131 l ant sw q1: 2sk882 y rf power amp q11: 2sc2954 q10: 2sc3775 3 d9: ma862 tx/rx sw sql sw 2nd lo sql x2: cdbca450cx24 noise amp noise det sql vr (vr-b unit) af filter af mute eeprom af power amp log...

  • Page 26: Section 10

    10 - 1 section 10 voltage diagram ds3 hrs-7219-a-y2 30 d im c20 0.01 d4 1ss196 r15 47 k r14 100 k r13 10 k 1 2 3 4 5 6 7 8 ic3 tc7w02f r11 6.8 k r10 33 k c8 0.01 r12 47 k q2 2sa1162 gr c17 0.01 r2 100 k d2 1ss272 r3 100 k q3 2sc2712 gr d3 1ss196 1 2 j2 c5 0.01 r1 10 k c4 0.01 c3 0.01 key.M c16 0.1 c...

  • Page 27

    10-2 main unit 10 - 2 l4 la-243 c10 10 p l5 ls-491 q1 2sk882 y l6 ls-491 c20 0.3 p r1 47 c199 0.1 c14 0.001 r5 c26 5 p c22 0.001 r7 100 c25 0.001 r9 22 k r8 820 k c31 0.022 c201 0.1 q2 3sk131 l fi1a fl-202 r18 1.5 k c32 0.001 c30 68 p r12 10 l8 0.47 h c36 10 p r13 680 r157 560 c35 0.001 r5 q3 2sc271...

  • Page 28

    Vr-b unit vr-a unit w1 1 2 3 4 5 6 7 8 p1 hv gnd vol2 vol1 hvs sqlv sqli sqlg sqlg sqli sqlv hv hvs gnd vol2 vol1 1 2 3 j1 1 2 3 4 5 j2 r1 10 k r1 10 k to main unit j1 10 - 3 10-3 vr-a and vr-b units.

  • Page 29

    Introduction danger this service manual describes the latest service information for the ic-m45/ic-m45euro vhf marine transceiver at the time of publication. 2 versions of the ic-m45/ic-m45euro have been designed. This service manual covers each version. Model ic-m45 ic-m45euro version u.S.A. U.S.A....

  • Page 30: Service

    Service manual vhf marine transceiver 6-9-16, kamihigashi, hirano-ku, osaka, 547-0002, japan s-13611iz-cd © 2000 icom inc..