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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

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    3%26)#% -!.5!, 6(& ic-m422.

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    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...

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    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) ...

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    1 - 2 • channel lists r e b m u n l e n n a h c a s u n a c t i m s n a r t e v i e c e r 1 0 0 5 0 . 6 5 1 0 5 6 . 0 6 1 a 1 0 0 5 0 . 6 5 1 0 5 0 . 6 5 1 2 0 0 0 1 . 6 5 1 0 0 7 . 0 6 1 3 0 0 5 1 . 6 5 1 0 5 7 . 0 6 1 a 3 0 0 5 1 . 6 5 1 0 5 1 . 6 5 1 0 0 2 . 6 5 1 0 0 8 . 0 6 1 a 4 0 0 0 2 . 6 5 ...

  • 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) ...

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    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...

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    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...

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    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...

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    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 ...

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    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 : ...

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    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) ref order description m. H/v no. No. Location [front unit] mc1 0800007890 mic hm-150b acc [blk] 0800007900 mic hm-150sw acc [sw] sp1 2510001240 sp 045p0803 w1 7120000470 jmp erds2t0 w2 7120000470 j...

  • Page 18

    6 - 2 m.=mounted side (t: mounted on the top side, b: mounted on the bottom side) s.=surface mount ref order description m. H/v no. No. Location [logic board] j2 6510018970 s.Cnr b4b-ph-sm3-tb b 76.2/6.5 j3 6510022310 s.Cnr b5b-ph-sm3-tb b 22.3/8 j4 6510021720 s.Cnr 30flt-sm1-tb b 55.4/11.8 j5 65100...

  • Page 19

    6 - 3 m.=mounted side (t: mounted on the top side, b: mounted on the bottom side) s.=surface mount ref order description m. H/v no. No. Location [main unit] r106 7510001651 s.Thm ntcg16 4bh 222jt t 72.3/75 r107 7030003500 s.Res erj3geyj 332 v (3.3 k Ω) t 72.3/76.3 r108 7030003860 s.Res erj3ge jpw v ...

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    6 - 4 m.=mounted side (t: mounted on the top side, b: mounted on the bottom side) s.=surface mount ref order description m. H/v no. No. Location [main unit] ref order description m. H/v no. No. Location [main unit] c32 4030009920 s.Cer c1608 ch 1h 050b-t t 62.3/49.6 c33 4030007050 s.Cer c1608 ch 1h ...

  • Page 21

    6 - 5 ref order description m. H/v no. No. Location [main unit] c331 4030006900 s.Cer c1608 jb 1h 103k-t t 51.5/4.4 c332 4030006860 s.Cer c1608 jb 1h 102k-t t 42.1/7.1 c333 4030006900 s.Cer c1608 jb 1h 103k-t t 42.1/5.8 c334 4030007050 s.Cer c1608 ch 1h 220j-t t 63.7/21.7 c335 4030006860 s.Cer c1608...

  • 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 ...

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    7 - 2 ic-m422-sm.Indd 9-10 4/21/2005 1:01:32 pm.

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    8 - 1 section 8 semiconductor information • transistor and fet’s • diodes.

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    ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( 6 6 6 6 6 6 6 6 6 6 6 6 6 6 ( ( ( ( ( ( ( ( ( ( 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 9 - 1 section 9 board layouts the combination of this page and the next page shows the unit layout in the same configuration as the actual p.C. Board. Ic-m422-sm 2.Indd 1-2 4/22/2005 1...

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    * * * * ,/')# s ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( 6 6 6 6 6 6 6 6 6 6 6 6 6 6 ( ( ( ( ( ( ( ( ( ( 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 (- "37 s #0 #0 n 9 - 2 the combination of this page and the previous page shows the unit layout in the same configuration as the actual p.C. Board. Ic-m422-sm 2.Indd 3-...

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    ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 #0 #0 )# -0 9 - 3 the combination of this page and the next page shows the unit layout in the same configuration as the actual p.C. Ic-m422-sm 2.Indd 5-6 4/22/2005 1:35:33 pm.

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    #0 #0 #0 #0 #0 #0 -!). S ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 7 * 7 7 7 31, s 62 s 9 - 4 the combination of this page and the previous page shows the unit layout in the same configuration as the actual p.C. Board. Ic-m422-sm 2.Indd 7-8 4/22/2005 1...

  • Page 29

    10 - 1 section 10 block diagram ic-m422-sm.Indd 21-22 4/21/2005 1:01:39 pm.

  • Page 30

    11 - 1 11-1 main unit 6 6 6 6 6 6 6 28 28 48 48 6 28 6 6 section 11 voltage diagram ic-m422-sm.Indd 23-24 4/21/2005 1:01:40 pm.

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    11 - 2 48 28 48 6 6 28 28 6 6 6 6 48 6 6 ic-m422-sm.Indd 25-26 4/21/2005 1:01:43 pm.

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    11 - 3 11-2 logic board ic-m422-sm.Indd 27-28 4/21/2005 1:01:44 pm.

  • Page 33

    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...

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    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) ...

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    S-14131mz-c1 © 2005 icom inc..