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Icom IC-M422 Service Manual

Other manuals for IC-M422: Instruction Manual, Service Manual
Manual is about: ICOM IC-M422 Radio-Marine: Instruction Manual

Summary of IC-M422

  • Page 1

    Vhf marine transceiver ic-m422 s-14131mz-c1-q jul. 2006 service manual.

  • Page 2

    Introduction repair notes this service manual describes the latest service information for the ic-m422 vhf marine transceiverat the time of publication. Danger never connect the transceiver to an ac outlet or to a dc power supply that uses more than 16 v. Such a connection could cause a fire or elec...

  • Page 3

    Section 1 specifications section 2 inside views section 3 disassembly instructions section 4 circuit description 4-1 receiver circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 4-2 transmitter circuits . . . . . . . . . . . . . . . . . . . . ...

  • Page 4: Section 1

    1 - 1 section 1 specifications m general • frequency coverage : tx rx 156.025–157.425 mhz 156.050–163.275 mhz • type of emission : 16k0g3e, 16k0g2b (dsc) • antenna impedance : 50 Ω (nominal) • operating temperature range : –4˚f to +140˚f • power supply requirement : 13.8 v dc ±15% (negative ground) ...

  • Page 5

    1 - 2 • channel list.

  • Page 6: Section

    2 - 1 section 2 inside views • front unit • main unit.

  • Page 7: Section 3

    3 - 1 section 3 disassembly instructions • removing the case 1 unscrew 4 screws, a. Note: when replacing the screws, 0.6–0.8 (n.M) of torque must be applied to ensure water resistance. 2 slide the case in the direction of the arrow to separate the front pannel. • removing the main unit 1 disconnect ...

  • Page 8: Section 4

    Section 4 circuit description 4-1 receiver circuits 4-1-1 antenna switching circuit the antenna switching circuit toggles the receive line and the transmit line. This circuit does not allow transmit signals to enter the receiver circuits. The received signals from the antenna connector (chassis unit...

  • Page 9

    4 - 2 4-1-6 squelch circuits noise squelch circuit mutes af output signals when no rf signals are received. By detecting noise components in the demodulated af signals, the squelch circuit switches the af mute switch on and off. A portion of the demodulated af signals from the fm if ic (ic2, pin 9) ...

  • Page 10

    4 - 3 4-3 pll circuits 4-3-1 vco circuit the vco circuit (q4, q5, d3, d4) directly generates both of the 1st lo frequency for receiving (134.35–141.575 mhz) and the transmit frequency (156.025–157.425 mhz). While receiving, the vco output signal (1st lo signal) is am- plifi ed at the buffer amplifi ...

  • Page 11

    4 - 4 4-7 cpu port allocations pin no. Port name description 2 keym input port for keys on hm-150b/sw. Approx. 2.02 v: [ y] key is pushed. Approx. 3.00 v: [ z] key is pushed. Approx. 3.84 v: [h/l] key is pushed. 3 txdet input port for transmit detected voltage. 4 lbat input port for low battery dete...

  • Page 12

    4 - 5 pin no. Port name description 71 dsc input port for the [dsc] key (logic board; s7). Low: [dsc] key is pushed. 72 pa input port for the [pa] key (logic board; s6). Low: [pa] key is pushed. 73 ch/wx input por t for the [ch/wx] key (logic board; s5). Low: [ch/wx] key is pushed. 74 scan input por...

  • Page 13

    5 - 1 equipment grade and range equipment grade and range dc power supply output voltage : 13.8 v dc current capacity : more than 10 a audio generator frequency range : 300–3000 hz measuring range : 1–500 mv rf power meter (terminated type) measuring range : 1–30 w frequency range : 100–300 mhz impe...

  • Page 14

    Adjustment adjustment condition measurement value adjustment point unit operation unit adjust lock voltage 1 • channel : ch16 (156.800 mhz) • receiving main connect a digital multi- meter or oscilloscope to the check point "cp1". 1.1–2.1 v main verify 2 • channel : ch16 (156.800 mhz) • output power ...

  • Page 15

    5 - 3 adjustment adjustment condition measurement value adjustment point unit operation unit adjust output power 1 • channel : ch16 (156.800 mhz) • output power : high • transmitting rear panel connect an rf power meter to the antenna connector. 23–23.5 w main r112 frequency deviation 1 • channel : ...

  • Page 16

    5 - 4 adjustment adjustment condition measurement value adjustment point unit operation unit adjust sensitivity 1 • channel : ch16 (156.800 mhz) • [sql] : max. Counterclockwise • connect a distortion meter with a 4 Ω load to the external speaker lead. • push [pa•rx ] for 1 sec. To turn the rx speake...

  • Page 17: Section 6

    6 - 1 section 6 parts list m.=mounted side (t: mounted on the top side, b: mounted on the bottom side) [logic board] ref order description m. H/v no. No. Location ic1 1140012751 s.Ic m30220ma-137rp (fx-2852a-1) b 48.1/48.5 ic2 1110005771 s.Ic s-80942cnmc-g9ct2g b 79.7/48.8 ic3 1180000421 s.Ic ta78l0...

  • Page 18

    6 - 2 m.=mounted side (t: mounted on the top side, b: mounted on the bottom side) [logic board] ref order description m. H/v no. No. Location ds8 5040003230 s.Led ry-sp110uhy24-5m t 85.7/50.9 ds9 5040003230 s.Led ry-sp110uhy24-5m t 10.5/50.9 ds10 5040003230 s.Led ry-sp110uhy24-5m t 85.7/33.5 ds11 50...

  • Page 19

    6 - 3 m.=mounted side (t: mounted on the top side, b: mounted on the bottom side) s.=surface mount [main unit] ref order description m. H/v no. No. Location r125 7030007990 s.Res erj12yj820u (82) t 83.4/69.4 r126 7030003670 s.Res erj3geyj 823 v (82 k) t 105.4/93.6 r127 7030003720 s.Res erj3geyj 224 ...

  • Page 20

    6 - 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 c55 4030006860 s.Cer c1608 jb 1h 102k-t t 65.4/52.2 c56 4030011770 s.Cer c1608 ch 1h 060b-t t 64.3/50.6 c57 4030006850 s.Cer c1608 jb 1h 471k-t t 65.4/53.5 c58 ...

  • Page 21

    6 - 5 [main unit] ref order description m. H/v no. No. Location c345 4030017730 s.Cer ecj0eb1e471k t 16/73.9 c346 4030017460 s.Cer ecj0eb1e102k t 50.4/7.5 c347 4030017680 s.Cer ecj0ec1h820j t 50.4/6.2 c348 4030017680 s.Cer ecj0ec1h820j t 42.2/15.2 c349 4030017460 s.Cer ecj0eb1e102k t 42.2/13.9 c351 ...

  • Page 22: Section 7

    7 - 1 section 7 mechanical parts and disassembly [vr board] ref. No. Order no. Description qty. Ds1 5030002850 lcd is08328e 1 ep2 8930066470 lcd contact srcn-2852-sp-n-w 1 mp1 8930066230 2852 lcd holder 1 mp2 8210020990 2807 reflector 1 mp3 8930066400 2852 lcd filter 1 mp4 8930066390 2852 lcd sheet ...

  • Page 23

    7 - 2 unit abbreviations (c): chassis parts, (l): logic board, (m): main unit, (f): front unit (vr): vr board, (sql): sql board 1 2 3 4 mp5 (c) mp22 (f) mp22 (f) sp1 (f) mc1 (f) glue mc1 (f) mp23 (f) mp25 (f) mp21 (f) a a b b mp31 (f) mp1 (f) mp1 (f) mp5 (l) mp22 (c) mp20 (c) mp14 (c) mp14 (c) mp21 ...

  • Page 24: Section 8

    8 - 1 section 8 semiconductor information • transistor and fet’s 3# 3ymbol " % # 3!! 3ymbol " % # " % # " % # " % # 3# 3 3ymbol " % # 3# 2 3ymbol 3+ 4, 3ymbol 3+ 4 ,! 3ymbol " % # $4! 3ymbol " % # +4!6 24&0 3ymbol " % # +4!9 24+0 3ymbol +4#3 3ymbol +4# 3ymbol 40# 3ymbol ' ' 3 $ $ ' $ $ $ 3 " % # 3# ...

  • Page 25: Section 9

    1 1 2 3 2 3 4 5 9-1 logic board • top view 9-3 sql board • top view 9-2 vr board • top view h5 h10 h15 h20 h25 h30 h35 h40 h45 h50 h55 h60 h65 h70 h75 h80 h85 h90 h0 v5 v0 v10 v15 v25 v30 v35 v20 v45 v50 v55 v40 v65 v60 9 - 1 section 9 board layouts the combination of this page and the next page sho...

  • Page 26

    C17 c124 c112 c95 c86 c87 c8 1 w1 j6 5 1 1 w1 w1 2 3 2 3 4 5 w1 1 8 1 3 gnd v olg v ol2 v ol1 pwr gnd v olg v ol2 v ol1 pwr gnd sql v s5v gnd sql v s5v sql board • bottom view vr board • bottom view logic board • bottom view cp3 cp2 internal speaker – + to main unit j5 29 1 30 j5 2 evck gnd send mmu...

  • Page 27

    C378 c377 c359 c358 c354 c384 c385 c360 c361 c304 c351 c345 c344 c305 c302 c301 c318 c315 c293 c292 c92 c20 c24 c23 c26 c323 c314 c313 c312 c311 c433 c424 c425 c423 c251 c262 c264 c337 c334 c335 c222 c223 c195 c203 c204 c207 c216 c220 c211 c212 c217 c210 c214 c219 c218 c231 c232 c234 c233 c236 c237 ...

  • Page 28

    Red shield yellow blue shield black cp19 cp18 cp17 cp16 sp– pao+ pao– sp+ to ext. Speaker cp21 cp22 to ext. Pa speaker gnd hv to dc power mp16 (chassis) ic3 to rear cable main board • bottom view h45 h40 h35 h30 h25 h20 h15 h10 h5 h0 v5 v10 v15 v0 v25 v30 v35 v20 v45 v50 v55 v40 v65 v70 v60 hm-150b/...

  • Page 29: Main Unit

    10 - 1 section 10 block diagram main unit front unit vr board sql board logic board hm-150b/sw nmeai + nmeai – nmeao ext sp option pa sp command mic-2 pwr ctrl lpf bpf bpf ceramic pwr ctrl af amp buff buff x1: cr-804a 21.25 mhz r1 buff rf amp if amp af mute ant fil loop r1 lpf lpf bpf ant sw drive p...

  • Page 30: Main Unit

    11 - 1 11-1 main unit 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 1 2 3 4 vcc vcc af/mic af/mic micg micg pttc pttc extrxd exttxd icf3 gnd to command mic hm-157b/sw optional products w2 opc-1029 fi3 alfy450e i o q36 2sk1069-4-tl-e r92 100 q37 dta144eu r205 1.2k c106 0.1 c111 47p c112 470p c113 0.001 c250 1 c251...

  • Page 31: Main Unit

    11 - 2 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 1 2 3 4 vcc vcc af/mic af/mic micg micg pttc pttc extrxd exttxd icf3 gnd to command mic hm-157b/sw optional products w2 opc-1029 fi3 alfy450e i o q36 2sk1069-4-tl-e r92 100 q37 dta144eu r205 1.2k c106 0.1 c111 47p c112 470p c113 0.001 c250 1 c251 0.01 c262 0.00...

  • Page 32: Logic Board

    11 - 3 internal speaker – + pck pdata send unlk pstb 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 29 27 25 23 21 19 17 15 13 11 9 7 5 3 1 gnd extrxd ds1 sdt-dt161-hp-o 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 31 32 33 34 35 36 37 38 39 ic5 njm2904m 1 2 3 4 5 6 7 8...

  • Page 33: Section 12  Hm-150B/sw

    Section 12 hm-150b/sw 12 - 1 12-1 mechanical parts and disassembly w1 8900012212 cable opc-1249b [hm-150b] [hm-150b] [hm-150b] 1 8900013570 cable opc-1406 [hm-150sw] [hm-150sw] [hm-150sw] 1 mp1 8210020111 2715 front panel -1 1 8210021061 2715 front panel (c)-1 1 mp2 8210020120 2715 rear panel 1 8210...

  • Page 34

    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) ...

  • Page 35

    S-14131mz-c1 -q © 2005–2006 icom inc..