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Icom IC-M25 Service Manual

Other manuals for IC-M25: Instruction Manual, Instruction Manual
Manual is about: VHF marine transceiver

Summary of IC-M25

  • Page 1

    S-15208xz-c1 august 2015 vhf marine transceiver im25 im25euro.

  • Page 2

    This service manual describes the latest technical informa- tion for the ic-m25 and ic-m25euro vhf transceiver , at the time of publication. Do not reverse the polarities of the power supply when con- necting the transceiver. Do not apply an rf signal of more than 20 dbm (100 mw) to the antenna conn...

  • Page 3

    Table of contents section 1 specifications section 2 inside views section 3 disassembly instruction section 4 battery pack replacement section 5 circuit descripiton 5-1 receiver circuits ...................................................................................... 5-1 5-2 transmitter circui...

  • Page 4: Section 1

    1-1 section 1 specifications m general ic-m25 (except [chn]) d • frequency coverage (mhz): tx 156.025–157.425 rx 156.050–163.275 • mode: fm (16k0g3e) • power supply voltage: 3.7 v dc nominal (negative ground) • current drain (approximately): tx (5 w/1.0 w) 2.3 a/0.9 a maximum audio (internal sp) 0.3...

  • Page 5: Section 2

    2-1 section 2 inside views ??????? (???) • main unit (top view) • ??? Unit (bottom view) ??????? (???) lock vo ltage buffer (ic400) ??????? (???) ??????? (???) af sw (ic260) lithium battery charger (ic601) ??????? (???) ??????? (???) ??????? (???) ??????? (???) ??????? (???) ??????? (???) ??????? (?...

  • Page 6

    2-2 ??????? (???) vco • main unit (top view) • ??? Unit (bottom view) ??????? (???) d/a converter (ic190) af amp (ic364) af power amp (ic362) cpu clock (x360) eeprom (ic340) dual op amp (ic365) ??????? (???) ??????? (???) 1st if filter (fi151) pll ic (ic1) reference frequency oscillator (x1) discrim...

  • Page 7

    3-1 section 3 disassembly instruction 1. Removing the main unit 1) remove the 6 screws from the rear panel. 2. Removing the chassis 1) remove the solder from the antenna connector conductor. 2) disconnect the ffc from the main unit. 2) carefully separate the rear panel, and turn it over in order to ...

  • Page 8

    4-1 section 4 battery pack replacement 1. Removing the old battery pack 1) remove the 6 screws from the rear panel. 2. Installing the new battery pack 1) glue the ferrite core to fix its position. Ferrite core indication lines doubled-sided tapes (supplied in pair) glue manufacture: cemedine inc. Na...

  • Page 9: Section 5

    5-1 section 5 circuit description 5-1 receiver circuits rf circuits the rf circuits consist of rf filters, antenna switch, rf amplifier (rf amp) and so on. The received signal is extract ed and amplified in the rf circuits. • antenna switching circuit the rf signal from the antenna is passed through...

  • Page 10

    5-2 5-2 transmitter circuits tx af circuits the af signal from the microphone (mic signals) is passed through the mic mute sw (ic260a), amplified by mic amp (ic200b), and then applied to the d/a converter (ic190), through another mic mute sw (ic260c). The level-adjusted mic signal is pre-emphasized ...

  • Page 11

    5-3 5-3 frequency synthesizer circuits vco while transmitting, the oscillation frequency of the vco (q21, q22, d22 and d23) is determined by the value of d22, d23, l22, c26 and c27, adding modulation signal to d20 modulates the oscillating signal. The generated signal is passed through the buffers (...

  • Page 12: Section 6

    6-1 section 6 adjustment procedure m connection equipment grade and range equipment grade and range cloning software adj-m25/m25euro (revision 1.0 or later) cables opc-478uc and opc-1655 rf power meter (50 Ω terminated) measuring range: 0.1–6 w frequency range: 100–300 mhz swr: less than 1.2 : 1 fre...

  • Page 13

    6-2 adjustment condition reference frequency tx output power fm modulation rx sensitivity • i/o check screen (the values shown above are exsample only. Each transceiver has own values.) the lock voltage is displayed here. Squelch m adjustment utility screen adjustment transceiver’s condition operati...

  • Page 14

    6-3 adjustment transceiver’s condition operation adjustment item value tx output power (high) 1 • ch.: 16 • transmitting • connect an rf power meter to the antenna connector. [rf power (high)] 4.5 w (l_high)* 2 [rf power (l_high)] 2.5 w (low) 3 [rf power (low)] 0.75 w (e_low)* 4 [rf power (e_low)] 0...

  • Page 15: Section 7. Parts

    Eqv.= this component is equivalent to the ref no. Component listed above, and may be substituted on parts orders and repairs. 7-1 section 7. Parts list ic1 1130016080 s.Ic gp214d b 39.6/11.3 ic50 1110008890 s.Ic nju7056f3-te2-#zzzh t 105.1/20.3 ic170 1110007320 s.Ic njm2591v-te1-#zzzb b 17.7/8.9 ic1...

  • Page 16

    Eqv.= this component is equivalent to the ref no. Component listed above, and may be substituted on parts orders and repairs. 7-2 ref parts description m. H/v no. No. Location [main unit] r171 7030009140 s.Res erj2gej 272 x (2.7k) b 23.2/10.5 r172 7030005000 s.Res erj2gej 471 x (470) b 21.0/11.9 r17...

  • Page 17

    7-3 eqv.= this component is equivalent to the ref no. Component listed above, and may be substituted on parts orders and repairs. M.=mounted side (t: mounted on the top side, b: mounted on the bottom side) s.=surface mount ref parts description m. H/v no. No. Location [main unit] c450 4030017500 s.C...

  • Page 18

    7-4 m.=mounted side (t: mounted on the top side, b: mounted on the bottom side) s.=surface mount eqv.= this component is equivalent to the ref no. Component listed above, and may be substituted on parts orders and repairs. Ref parts description m. H/v no. No. Location [mic unit] c410 4030017620 s.Ce...

  • Page 19: Section 8. Mechanical

    8-1 [chassis parts] ref order description qty. No. No. Mp1 8210031130 3723 front panel assembly [usa] 1 8210031130 3723 front panel assembly [exp] 1 8210031100 3723 front panel assembly (a) [eur] 1 8210031100 3723 front panel assembly (a) [uk] 1 8210031100 3723 front panel assembly (a) [frg] 1 82100...

  • Page 20

    8-2 mp9(chassis) (8930092200) mp12(chassis) (8930092090) mp8(chassis) (8930083240) mp10(chassis) (8110010830) mp7(chassis) (8210030950) mp22(chassis) (8930092140) mp25(chassis)x6 (8930063690) mp24(chassis)x6 (8820001510) j31(chassis) (6910021491) mp14(chassis) (8850003421) mp31(chassis) (8010023460)...

  • Page 21: Section 9. Board

    9-1 section 9. Board layouts j250 s250 b8383 h0 h5 h10 h15 v0 v5 v10 v15 v20 v25 • main unit b-8382 (top view) • mic unit b-8383 (top view) [sp/mic] [ptt] c8 c9 c12 c15 c56 c57 c58 c59 c60 c133 c155 c156 c157 c159 c160 c182 c200 c202 c205 c206 c207 c260 c261 c262 c360 c361 c363 c364 c365 c366 c373 c...

  • Page 22: • Main Unit B-8382

    9-2 c410 c411 ep4 ep5 ep6 ep7 ep8 j607 j608 r651 h0 h5 h10 h15 v0 v5 v10 v15 v20 v25 • main unit b-8382 (bottom view) • mic unit b-8383 (bottom view) sp+ j251 1 sp− 2 sp1 (chassis) [pwr] [ant] [charge] mc250 c2 c3 c4 c5 c6 c7 c11 c13 c18 c19 c20 c21 c22 c24 c25 c26 c27 c28 c30 c31 c32 c33 c34 c35 c3...

  • Page 23: Section 10. Block

    10-1 section 10. Block diagram lpf ant sw antenna pwr amp drive pre bpf rf amp bpf tx/rx sw buff bpf apc ctrl buff buff buff bpf if amp fil loop vcc vcc lpf x170 450khz bpf limit amp lpf af amp x1 21.25mhz vcc hv bpf bpf power sw af mute af mute af mute m3v hv vcc buff pwr amp amp amp amp amp m3vs r...

  • Page 24: Section 11. Voltage

    11-1 section 11. Voltage diagram * refer to the parts list for the value and name of component. • main unit (1/2) 0.1 c283 0.01 c193 0.01 c200 0.01 c262 0.01 c340 0.01 c360 0.001 c206 0.001 c252 0.047 c361 0.047 c363 0.047 c364 0.047 c365 0.047 c366 0.1 c202 0.1 c207 0.01 c263 0.027 c266 0.018 c205 ...

  • Page 25

    11-2 • main unit (2/2) * refer to the parts list for the value and name of component. 0.001 c453 mpz1608s221a ep3 mpz1608s221a ep2 rb706f d91 0.1 c58 0.1 c181 0.01 c56 0.001 c6 0.001 c20 0.001 c12 0.001 c25 0.001 c28 0.001 c30 0.001 c31 0.001 c44 0.001 c35 0.001 c36 0.001 c38 0.001 c41 0.001 c50 0.0...

  • Page 26

    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) 61 ...

  • Page 27

    1-1-32, kamiminami, hirano-ku, osaka 547-0003, japan s-15208xz-c1 © 2015 icom inc..