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Icom IC-A200 Service Manual

Summary of IC-A200

  • Page 1

    vhf air band transceiver ic-a200 s-14227mz-c1 apr. 2006.

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    This service manual describes the latest service information for the following transceivers at the time of publication. Be sure to include the following four points when ordering replacement parts: 1. 10-digit order numbers 2. Component part number and name 3. Equipment model name and unit name 4. Q...

  • Page 3

    Table of contents section 1 specifications section 2 inside views section 3 circuit description 3 - 1 receiver circuits .................................................................................................... 3 - 1 3 - 2 transmitter circuits .................................................

  • Page 4: Section 1

    1 - 1 section 1 specifications general • frequency range : 118.000–136.975 mhz • mode : am (6k00a3e) • tuning steps : 25 khz, 50 khz or 1 mhz • number of memory channels : 9 • frequency stability : ±0.0015% (–20°c to +55°c) • antenna impedance : 50 Ω • power supply requirement : 13.75 v dc ±15% (neg...

  • Page 5: Section 2

    Section 2 inside views 2 - 1 ...

  • Page 6: Section 3

    3 - 1 section 3 circuit description 3-1 receiver circuit s 3-1-1 antenna switching circuit (pa unit) the antenna switching circuit functions as a low-pass filter while transmitting and as a resonator circuit while receiving. Received signals enter the pa unit from the antenna connector and pass thro...

  • Page 7

    3 - 2 3-1-5 am detector circuit (main unit) the am detector circuit demodulates the 2nd if signal to af signals. The 2nd if signal from q10 is detected at the am detector (q49) for conversion to af signals. A pn junction construction inside q49 is used for am detection to obtain low output impedance...

  • Page 8

    3-2 transmitter circuits 3-2-1 mic amplifier circuit (main unit) the mic amplifier circuit amplifies the mic audio with the limiter circuit to a level needed for the am modulator. Mic audio signals pass through the mic switch (q4) and are then applied to the limiter amplifier (ic13, pin 2). The mic ...

  • Page 9

    3-3 pll circuits 3-3-1 general (pll unit) the pll circuit steadily oscillates the transmit and receive local frequencies while comparing the phase of the divided vco frequency and reference frequency. Therefore, the pll output frequency is controlled by the divided ratio (n-data) of the programmable...

  • Page 10

    3-4 voltage lines 3-5 cpu port allocations line description vcc a voltage line from the external dc power connector. T8v used for the transmitter circuit. Produced by the t8v regulator (q34, q35, d32) and controlled by the t/r switching circuit (ic10a–ic10c). R8v used for the receiver circuit. Produ...

  • Page 11: Section 4

    Section 4 memory protection to prevent accidental changes, required memory channels can be specified as protect channels. The contents of protect channels cannot be changed by a user. 4-1 memory protection programming note: do not push and hold [ ] in steps 4), 7) and 9), or other functions are acti...

  • Page 12: Section 5

    Section 5 connections 5-1 wiring connection ...

  • Page 13

    Audio wiring use #24 awg wires for connectors. Memory channel and frequency exchange switches for the memory channel switch and frequency exchange switch, use a 2-position rocker switch or 2 separate momentary push switches. Power cable wiring use 2 pairs of #18 awg wires for power and power groundi...

  • Page 14

    5-3 rack mount assembly 5 - 3.

  • Page 15: Section 6

    Section 6 adjustment procedures 6-1 preparation before servicing required test equipments equipment grade and range dc power supply output voltage : 13.2 v dc current capacity : 2 a or more rf power meter measuring range : 1–10w frequency range : 100–180 mhz impedance : 500 swr : less than 1.2:1 fre...

  • Page 16

    6-2 pll adjustment 6-3 receiver adjustment adjustment adjustment conditions measurement value adjustment point unit location unit adjust reference oscillator 1 • frequency display: 118.000 mhz • receiving main connect the frequency counter to j31. 32.000000 mhz main c199 lock voltage 1 • frequency d...

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    ...

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    6 - 4 6- 4 transmitter adjustment adjustment adjustment conditions measurement value adjustment point unit location unit adjust idling current 1 • disconnect p3 • unsolder c.P. + and c.P. –. • frequency display : 127.000 mhz • transmitting pa connect the dc ammeter (1 a) to point between c.P.+ and c...

  • Page 19

    6 - 5 ...

  • Page 20: Section 7

    7 - 1 section 7 mechanical parts and disassembly 7-1 mechanical parts label number order no. Description qty. Q 8210006550 867 front panel 1 w 8610007601 knob n174(a)-1 1 e 8010001170 knob cover for n174/(a) 2 r 8610007613 knob n175-3 1 t 8010011600 knob cover for n175 1 y 8610007591 knob n174-1 1 u...

  • Page 21

    !5 !65 !7 #4 #6 @9 @9 @9 !8 #4 #5 u i o !0 !1 !2 !4 q w e t y !3 !3 !3 !3 !3 !3 r e !4 @9 @9 @6 #8 @7 @5 @7 @7 @7 @4 @3 !9 @7 @7 @0 @8 #3 #2 #1 #7 @7 @7 #0 @2 @7 @1 #7 #8 #9 $0 $1 $2 $3 $4 $5 $6 $7 $8 $9 %0 %1 %2 %3 %4 7 - 2 label number or...

  • Page 22: Section 8

    8 - 1 section 8 parts list m.=mounted side (t: mounted on the top side, b: mounted on the bottom side) [main unit] ref order description no. No. Ic5 1110002550 ic ta7252ap ic6 1120002900 s.Ic m5223afp ic7 1140009120 s.Ic µpd750004gb-f10-3bs-mtx ic8 1130012670 s.Ic br93l46f ic9 1110005711 s.Ic s-8084...

  • Page 23

    8 - 2 m.=mounted side (t: mounted on the top side, b: mounted on the bottom side) s.=surface mount [main unit] ref order description no. No. R108 7030003540 s.Res 6.8k erj3ge r109 7030003540 s.Res 6.8k erj3ge r110 7030003440 s.Res 1k erj3ge r111 7030003440 s.Res 1k erj3ge r112 7030000080 s.Res 3.3 m...

  • Page 24

    8 - 3 m.=mounted side (t: mounted on the top side, b: mounted on the bottom side) s.=surface mount [main unit] ref order description no. No. R369 7030003610 s.Res 27k erj3ge r370 7030003440 s.Res 1k erj3ge r371 7030003480 s.Res 2.2k erj3ge r372 7030003580 s.Res 15k erj3ge r373 7030003440 s.Res 1k er...

  • Page 25

    8 - 4 m.=mounted side (t: mounted on the top side, b: mounted on the bottom side) s.=surface mount [main unit] ref order description no. No. J4 6510003430 cnr b07b-eh-s j5 6510003420 cnr b06b-eh-s j6 6510010020 cnr rtb-1.5-2f j7 6910001040 cnr ips-1136 j13 6510007020 cnr tmp-j01x-v6 j14 6510007020 c...

  • Page 26

    S3001 2260001620 sw sw-133 (rk09720hm) r5021 7010004070 res r20j 100 r5022 7010004110 res r20j 220 r5023 7010004070 res r20j 100 r5024 7070000210 res crh100x r-02j 47 c5001 4010006280 cer he50sj sl 101j 50v c5002 4010006060 cer he40sj sl 100d 50v c5004 4010006880 cer he50sj yb 102k 50v c5008 4010006...

  • Page 27

    D6001 1710000010 dio 15cd11 j6001 6510014210 cnr bnc-bj 8 - 6 m.=mounted side (t: mounted on the top side, b: mounted on the bottom side) s.=surface mount [chassis parts] ref order description no. No..

  • Page 28: Section 9

    9 - 1 section 9 board layouts ...

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    9 - 2 ...

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    ...

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    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..

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    9 - 5 ...

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    9 - 6 the combination of this page and the previous page shows the unit layout in the same configuration as the actual p.C. Board..

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    10 - 1 section 10 block diagram ...

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    11 - 1 section 11 voltage diagram ...

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    11 - 2 ...

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    1-1-32, kamiminami, hirano-ku, osaka 547-0003, japan s-14227mz-c1 © 2006 icom inc..