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Icom IC-M23 Service Manual

Other manuals for IC-M23: Instruction Manual
Manual is about: VHF MARINE TRANSCEIVER

Summary of IC-M23

  • Page 1

    S-14720xz-c1 apr. 2011 vhf marine transceiver.

  • Page 2

    This service manual describes the latest technical information for the ic-m23 and ic-m24 vhf marine transceiver, at the time of publication. Never connect the transceiver to an ac outlet or to a dc power supply that uses more than the specified voltage. This will ruin the transceiver. Do not reverse...

  • Page 3

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

  • Page 4: Section 1. Specifications

    1 - 1 section 1. Specifications m ic-m24 d general • frequency coverage : transmitting 156.025–157.425 mhz receiving 156.050–163.275 mhz • mode : fm (16k0g3e) • antenna impedance : 50 Ω (nominal) • power supply requirement : bp-266 only (3.7 v dc nominal; negative ground) • current drain (approximat...

  • Page 5: Section 2. Inside

    2 - 1 section 2. Inside views • main unit (top view) m3v line sw (q225) charging controller (ic601) speaker jack (j251).

  • Page 6

    2 - 2 vco • main unit (bottom view) pre-drive amp (q53) if demodulator ic (ic170) af power amp (ic362) af lpf/limit amp/af amp (ic200) noise amp (ic365) d/a converter (ic190) tx power amp (q54) tx power amp (q55) reference frequency oscillator (x1) pll ic (ic1) eeprom (ic340) cpu clock (x360) discri...

  • Page 7: Section 3. Disassembly

    3 - 1 section 3. Disassembly instruction 1. Removing the pcb 1) remove the battery pack from the transceiver. 2) remove the dc cap and antenna nut. 3) remove 6 screws from the rear panel. 2. Removing the chassis 1) unsolder 3 points shown. 4) carefully lift the rear panel up and unplug the wet senso...

  • Page 8: Section 4. Circuit

    4 - 1 section 4. Circuit description 4-1 receiver circuits rf circuits the rf circuits consist of rf filters, antenna switch (ant sw), rf amplifi er (rf amp), etc., and extract and amplify the signal of frequency which is desired to receive. • antenna switching circuit the rf signal from the antenna...

  • Page 9

    4 - 2 4-2 transmitter circuits tx af circuits af signal from the microphone (mic signals) is passed through the mic mute sw (ic260a), amplifi ed 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 b...

  • Page 10

    4 - 3 4-3 frequency synthesizer circuits vco while transmitting, the oscillatinon frequency of vco (q21, q22, d22) is determined by the value of d22, l22, c26 and c27, and the frequency modulation is carried out by adding modulation signal to d20. The generated signal is passed through the buffers (...

  • Page 11

    4 - 4 4-5 port allocations • cpu (ic360) • d/a converter (ic190) pin no. Line name description i/o 1 beep beep audio (squarewave). O 2 ps pll power save mode control. O 3 tdec decoded tone signal. (for monitoring purpose) o 4 dastb strobe for the d/a converter. O 5 plstb strobe for the pll ic. O 10 ...

  • Page 12: Section 5. Adjustment

    5 - 1 section 5. Adjustment procedure ¤ connection equipment grade and range equipment grade and range cloning software cs-m24/m23 adj (revision 1.0 or later) cables opc-478uc and opc-2091 rf power meter (50 Ω terminated) measuring range : 0.1–6 w frequency range : 100–300 mhz swr : less than 1.2 : ...

  • Page 13

    5 - 2 adjustment condition reference frequency tx output power rx sensitivity squelch ¤ adjustment utility screen adjustment transceiver’s condition operation adjustment item value pll lock voltage verification 1 • ch. : 16 • receiving 1) connect an rf power meter to the antenna connector. 2) click ...

  • Page 14

    5 - 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)...

  • Page 15: Section 6. Parts

    6 - 1 section 6. Parts list ic1 1130011671 s.Ic mb15e03slpfv1-g-er-6e1 b 41.85/11.6 ic50 1110006490 s.Ic lmv321idckr t 96.7/19.9 ic170 1110007320 s.Ic njm2591v-te1-#zzzb b 56.7/36.9 ic190 1190001350 s.Ic m62364fp 600d b 39.0/25.3 ic200 1110006470 s.Ic lmv324ipwr b 37.7/38.1 ic220 1180003690 s.Reg nj...

  • Page 16

    6 - 2 ref parts description m. H/v no. No. Location [main unit] r120 7030007290 s.Res erj2gej 222 x (2.2k) b 82.0/24.9 r121 7030005220 s.Res erj2gej 223 x (22k) b 86.1/24.0 r122 7030005100 s.Res erj2gej 154 x (150k) b 88.7/23.6 r152 7030005120 s.Res erj2gej 102 x (1k) b 80.4/34.5 r153 7030005120 s.R...

  • Page 17

    6 - 3 ref parts description m. H/v no. No. Location [main unit] c83 4030017400 s.Cer c1005 ch 1h 220j-t b 102.0/5.5 c84 4030018120 s.Cer c1005 ch 1h 110j-t b 103.1/6.7 c85 4030017410 s.Cer c1005 ch 1h 240j-t b 103.5/5.5 c86 4030017610 s.Cer c1005 ch 1h 090c-t b 106.1/6.7 c89 4030017590 s.Cer c1005 c...

  • Page 18

    6 - 4 ref parts description m. H/v no. No. Location [main unit] ds240 5040003060 s.Led sml-512wwt86 t 53.1/3.8 ds241 5040003060 s.Led sml-512wwt86 t 61.1/3.8 ds242 5040003510 s.Led lnj426w83ra t 17.2/32.2 ds243 5040003510 s.Led lnj426w83ra t 28.1/32.2 ds244 5040003510 s.Led lnj426w83ra t 17.2/18.5 d...

  • Page 19: Section 7. Mechanical

    7 - 1 [chassis parts] ref order description qty. No. No. J31 6910014190 2497 ant connector 1 sp1 2510001410 036d0803-1 1 w1 8900009640 opc-963 1 w2 8900020040 opc-2138 1 mp1 8210026940 3340 front panelassembly [m24] 1 8210027040 3340 front panel (a)assembly [m23] 1 mp5 8930082450 3340 keyboard [m24]...

  • Page 20

    7 - 2 mp360(m) mp361(m) mp18(ch) mp16(ch) mp7(ch) mp33(ch)x4 mp51(ch)x2 mp48(ch) mp22(ch) mp33(ch) mp21(ch) mp24(ch)x6 mp25(ch)x6 w2(ch) to j602(m) mp6(ch) mp50(ch) mp17(ch) mp15(ch) mp14(ch) j31(ch) mp1(ch) ep360(m) mp5(ch) mp362(m) mp33(ch)x5 mp39(ch) mp53(ch) w1(ch) sp1(ch) mp32(ch) mp42(ch) mp34...

  • Page 21: Section 8. Board

    8 - 1 section 8. Board layouts • main unit (top view) j601 hv gnd gnd [dc] the combination of this page and next page shows the top side and bottom side of actual p.C. Board. J251 sp+ 1 sp− 2 c44 c56 c57 c58 c59 c60 c64 c66 c77 c78 c155 c156 c157 c159 c160 c192 c222 c223 c224 c225 c262 c282 c380 c39...

  • Page 22: • Main Unit

    8 - 2 the combination of this page and next page shows the top side and bottom side of actual p.C. Board. • main unit (bottom view) [ptt] j602 wet sensor sp+ 1 sp− 2 c2 c3 c4 c5 c6 c7 c8 c9 c11 c12 c13 c15 c20 c21 c22 c24 c25 c26 c27 c28 c30 c31 c32 c33 c34 c35 c36 c37 c38 c39 c40 c41 c42 c43 c50 c5...

  • Page 23: Section 9. Block

    9 - 1 section 9. Block diagram lpf ant sw antenna j1 pwr amp drive pre bpf rf amp bp f lo sw buff bpf apc ctrl buff buff buff bpf if amp fil loop vcc vcc lpf (splatter) x170 450khz bpf limit amp lpf af am p x1 21.25mhz amp vcc hv bpf bpf power sw af mut e af mute af mute m3v hv vcc buff pwr am p am ...

  • Page 24: Section 10. Voltage

    10 - 1 section 10. Voltage diagram *: refer to the parts list for the value and name of component. • main unit (1/2) tx:0.00v rx:3.70v 1.45v tx:2.98v rx:0.00v 1.45v 1.43v 2.99v ledon:2.98v 4.915mhz 1.76vp-p c206 0.001 r273 22k c385 0.01 ds246 tak-35920 1 seg0 2 seg1 3 seg2 4 seg3 5 seg4 6 seg5 7 seg...

  • Page 25

    10 - 2 • main unit (2/2) *: refer to the parts list for the value and name of component. Tx:0.00v rx:2.74v rx:0.00v tx:2.67v 2.86v 1.94v v 6 7 . Pon: 2.99v poff:0.00v 4 v 6 9 . 4 : e g r a h c tx:0.00v rx:1.20v tx:0.00v rx:1.08v rx:2.57v tx:0.00v v 0 0 . 6 : e g r a h c tx:2.84v rx:2.86v tx:2.25v rx...

  • 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-14720xz-c1 © 2011 icom inc..