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Icom IC-2820H Service Manual

Manual is about: Dual band FM

Summary of IC-2820H

  • Page 1

    S-14325xz-c1 mar. 2007 dual band fm transcever.

  • Page 2

    This service manual describes the latest service information for the ic-2820h dual band fm transcever at the time of publication. Never connect the transceiver to an ac outlet or to a dc power supply that uses more than 15 v. This will ruin the transceiver. Do not expose the transceiver to rain, sno...

  • Page 3

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

  • Page 4: Section 1

    1 - 1 section 1 specifications , ! 2 % . % ' s z ( - ti n u e g a r e v o c y c n e u q e r & y l n o e g n a r z ( - n d e e t n a r a u ' ! 3 5 e h t r o f e g n a r z ( - n d e e t n a r a u ' n o i s r e v l a r e n e ' e h t r o f z ( - n d e e t n a r a u g t o . D n a o t d e e t n a r a u g ...

  • Page 5: Section 2

    2 - 1 section 2 inside views d/a converter (ic8: m62364fp) level converter (ic46: max3221ipwr) 1st if mixer for vhf bands (ic19: spm5001) lo divider (79.150−121.150 mhz) • bottom view • top view if ic (right band) (ic18: ta31136fng) if ic (left band rx) (ic15: ta31136fng) reference frequency oscilla...

  • Page 6: Section 3

    3 - 1 section 3 disassembly instruction 1. Removing the top cover q unscrew 10 screws, then remove the top cover. 3. Removing the main unit q unscrew 11 screws from the main unit. 2. Removing the bottom cover q unscrew 7 screws, then remove the bottom cover. 10 screws top cover w disconnect the spea...

  • Page 7: Section 4

    4 - 1 section 4 circuit description 4-1 receiver circuits rf circuits • 118−174 mhz the received signals from the antenna connector ant-1 (j1) are passed through two lpfs (l101, 104, 108, c342, 346; l88, 92, 96, c318, 326, 330), then applied to the rf amplifi er (q37) via tx/rx switch (d75). The amp...

  • Page 8

    4 - 2 1st if circuits rx signals from the rf circuits are converted into the 38.85 mhz 1st if signal by being mixed with lo signals from the left band vco (q111, d145−147). The converted if signal from the 1st mixer is passed through the if fi lter (fi5) to be fi ltered. The fi ltered if signal is a...

  • Page 9

    4 - 3 r366 c928 fi3 c926 r885 r352 c460 r414 r400 c491 c470 r351 am demodulator circuits • demodulator circuits (right band) noise filter x3 180k r376 c454 r397 c476 r375 agc voltage to the 1st if amplifier (q75) r415 if ic (ic18) 1 osci n 2 oscout 3 mixout 4 vcc 5 ifin 6 dec 7 filout 8 fili n 9 afo...

  • Page 10

    4 - 4 4-2 transmitter circuits microphone amplifier circuits the audio signals from the microphone (mic signals) are applied to the microphone amplifi er (ic28) via j2 and hpf (q87). The amplified mic signals are passed through the microphone gain switch (q88) and mic mute switch (ic30), then passed...

  • Page 11

    4 - 5 the modulation signals are applied to the variable capacitor d87 of the left band vco (q73, d87, 91, 92) via the modulation selector (ic63) and modulation mute switch (q64), and modulated. The modulated vco output are amplifi ed by the buffer (q76) and lo amplifi er (ic45), and applied to the ...

  • Page 12

    4 - 6 4-3 frequency synthesizer vcos this transceiver has 3 vcos; left band vco, right band rx vco and right band tx/rx vco. Left band vco (q111, d145–147) this vco oscillates 1st lo signals for left band rx and tx signal for vhf band. The vco output signal is amplifi ed by buffer (q113) and lo ampl...

  • Page 13

    4 - 7 amp pll ic buff fil loop buff vco sw buff vco sw q73 d91 q76 q74 d160 q62 d87 q61 d86 d92 ic14 d89 q72 tcxo 15.3mhz r_pllstb plldata pllck x1 q60 ic45 d102 d90 164.350−220.350 mhz 353.65−523.170 mhz to the tx amplifiers or lo filters pll circuits the pll circuit provides stable oscillation of ...

  • Page 14

    4 - 8 pwr ctrl +8 reg ic21 q81 pwr cpu5v noise fil filter noise current detect idet hv hv tx power amplifiers (ic2, ic3) main unit control unit cpu (ic25) (for current monitoring) cpu (ic25), eeprom (ic22), reset ic (ic23), etc. Pll ics (ic14, ic41), d/a converter (ic8), alc ic (ic32), etc. Vcc 5vs ...

  • Page 15

    4 - 9 4-5 cpu port allocation pin no. Port name description i/o 3 an cut-off frequency shifting signal to the hpf (ic48). O 4 da_sel cut-off frequency shifting signal to the hpf (ic48). O 5 mm_mute mic mute signal to the mic mute switch (ic30). “h”=mic mute. O 6 dcont alc amplifier control signal to...

  • Page 16

    4 - 10 pin no. Port name description i/o 83 l_af_mute af mute signal to the sp mute switch (q102). O 85 mic_ptt input port for [ptt] key on the connected microphone. I 100 reset reset enable signal input. I 101 l_sql noise signal from the if ic (left band; ic15). I 102 cl_sft2 clock frequency shifti...

  • Page 17: Section 5

    5 - 1 section 5 adjustment procedure ¤ required test equipments when adjusting ic-2820h, following test equipments and jig cable (modified 8-pin modular jack; see the illust below) are required. Equipment grade and range equipment grade and range dc power supply output voltage : 13.8 v dc current ca...

  • Page 18

    5 - 2 adjustment adjustment conditions operation value reference frequency (left band) [l ref] 1 • • • c o n n e c t a te r m i n a t o r t o t h e antenna connector (j1). Loosely couple a frequency coun- ter to the antenna connector (j1). Transmitting rotate the right band’s [dial] to adjust the re...

  • Page 19

    5 - 3 adjustment item adjustment conditions operation value 144 mhz band transmit output power (hi power) (band low) [l phl] 1 • • connect an rf power meter to the antenna connector (j1). Transmitting rotate the right band’s [dial] to adjust the transmit output power, then push the right band’s [mai...

  • Page 20

    5 - 4 adjustment item adjustment conditions operation value 144 mhz band deviation (left band) (band low) (fm) [l fmd] 1 • • • connect a modulation analyzer to the antenna connector (j1) through an attenuator. Connect an audio generator to the jig cable (see the page 5-1 for the connector and settin...

  • Page 21

    5 - 5 adjustment item adjustment conditions operation value 430 mhz deviation (right band) (band low) (fm) [r fmd] 1 • • • connect a modulation analyzer to the antenna connector (j1) through an attenuator. Connect an audio generator to the jig cable (see the page 5-1 for the connector and setting de...

  • Page 22

    5 - 6 adjustment item adjustment conditions operation value sensitivity connect a standard signal generator to the antenna connector (j1). 118.020 mhz (left band) [l lt1] 1 • set the ssg as; frequency : 118.020 mhz push the right band’s [main•band] key. (automatic adjustment) (right band) [r lt1] 2 ...

  • Page 23

    5 - 7 adjustment item adjustment conditions operation value sensitivity 375.020 mhz (left band) [l lt5] 19 • set the ssg as; frequency : 375.020 mhz push the right band’s [main•band] key. (automatic adjustment) (right band) [r lt5] 20 399.980 mhz (left band) [l ht5] 21 • set the ssg as; frequency : ...

  • Page 24

    5 - 8 adjustment item adjustment conditions operation value s-meter connect a standard signal generator to the antenna connector (j1). 127.020 mhz (s3 level) (left band) [l s31] 1 • set the ssg as; frequency : 127.020 mhz level : −1 dbµ push the right band’s [main•band] key. (automatic adjustment) (...

  • Page 25

    Adjustment item operation value squelch connect a terminator (50 Ω) to the antenna connector (j1). 127.020 mhz (fm) [l sq1] 1 push the right band’s [main•band] key. (automatic adjustment) (fm) [r sq1] 2 (fm-n) [l sq1] 3 (fm-n) [r sq1] 4 146.020 mhz (fm) [l sq2] 5 (fm) [r sq2] 6 (fm-n) [l sq2] 7 (fm-...

  • Page 26: Section 6

    6 - 1 section 6 parts list m.=mounted side (t: mounted on the top side, b: mounted on the bottom side) [control unit] ref order description m. H/v no. No. Location ic3 1180000421 s.Ic ta78l05f (te12r,f) b 29.7/14.1 ic6 1180002371 s.Reg r1111n321b-tr-f b 42.4/18.8 ic9 1110005991 s.Ic s-80945cnmc-g9f-...

  • Page 27

    6 - 2 m.=mounted side (t: mounted on the top side, b: mounted on the bottom side) [control unit] ref order description m. H/v no. No. Location c87 4030016790 s.Cer ecj0eb1c103k b 116.1/25.4 c95 4550006840 s.Tan teesva 1e 225m8r b 52.3/24.5 c101 4550006840 s.Tan teesva 1e 225m8r b 93/25.2 c102 455000...

  • Page 28

    6 - 3 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 q49 1590003290 s.Tr unr9213j-(tx) t 102.9/93.5 q50 1590003290 s.Tr unr9213j-(tx) t 113.8/89.6 q52 1530003990 s.Tr 2sc4738-bl (te85l,f) b 25.4/47.8 q53 159000323...

  • Page 29

    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 d154 1790001260 s.Dio ma2s077-(tx) t 80.7/70 d155 1790001621 s.Dio 1sv308 (tpl3,f) t 88.4/63.5 d156 1790001260 s.Dio ma2s077-(tx) t 77.1/70 d157 1790001621 s.Di...

  • Page 30

    6 - 5 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 r15 7030005240 s.Res erj2gej 473 x (47 k) t 103.6/101.6 r16 7030005240 s.Res erj2gej 473 x (47 k) t 18/128.5 r17 7030005240 s.Res erj2gej 473 x (47 k) t 85.9/76...

  • Page 31

    6 - 6 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 r245 7030005050 s.Res erj2gej 103 x (10 k) t 34.7/148.8 r246 7030005090 s.Res erj2gej 104 x (100 k) t 112/88.6 r247 7030007320 s.Res erj2gej 225 x (2.2 m) t 117...

  • Page 32

    6 - 7 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 r481 7030005160 s.Res erj2gej 105 x (1 m) b 124.8/81.4 r482 7030005050 s.Res erj2gej 103 x (10 k) t 116.8/86.2 r483 7030000020 s.Res mcr10ezhj 1 (010) t 128/20....

  • Page 33

    6 - 8 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 r769 7030005230 s.Res erj2gej 334 x (330 k) t 60.1/18.4 r770 7030005110 s.Res erj2gej 224 x (220 k) t 114.4/69.1 r771 7030005110 s.Res erj2gej 224 x (220 k) t 7...

  • Page 34

    6 - 9 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 c101 4030017530 s.Cer ecj0ec1h0r5b t 95.5/105.4 c102 4030017590 s.Cer ecj0ec1h070c t 18.7/121.5 c103 4030017460 s.Cer ecj0eb1e102k t 19.6/121.5 c104 4030017350 ...

  • Page 35

    C322 4030017460 s.Cer ecj0eb1e102k t 81.7/118.1 c323 4030017350 s.Cer ecj0ec1h020b t 106.6/133.4 c324 4030017460 s.Cer ecj0eb1e102k t 59/138.9 c325 4030017360 s.Cer ecj0ec1h030b t 60.6/139.8 c326 4030011220 s.Cer grm31m2c2h360jv01l b 61.5/144 c327 4030018010 s.Cer ecj0ec1h360j t 98.4/137 c328 403001...

  • Page 36

    C540 4030017390 s.Cer ecj0ec1h180j b 28.8/65.8 c541 4030017730 s.Cer ecj0eb1e471k t 73.2/81.6 c543 4030017360 s.Cer ecj0ec1h030b b 29.5/72.2 c544 4030017350 s.Cer ecj0ec1h020b t 32.8/57.6 c547 4030017460 s.Cer ecj0eb1e102k t 34.7/68.3 c548 4030016790 s.Cer ecj0eb1c103k b 27.5/74.2 c549 4030017460 s....

  • Page 37

    C782 4030017460 s.Cer ecj0eb1e102k t 79.8/57.5 c783 4030017460 s.Cer ecj0eb1e102k t 90.3/44.4 c784 4030017460 s.Cer ecj0eb1e102k t 85.4/47.1 c785 4030017670 s.Cer ecj0ec1h390j t 85.4/63.8 c786 4030017460 s.Cer ecj0eb1e102k t 75.3/55.5 c787 4030017630 s.Cer ecj0ec1h120j t 83.7/60.9 c788 4030017460 s....

  • Page 38

    Ep40 6910018460 s.Bea mmz1005y102c-t b 127.7/36.8 ep41 6910018460 s.Bea mmz1005y102c-t b 127.7/34.1 ep42 6910018460 s.Bea mmz1005y102c-t b 127.7/35.9 ep43 6910018460 s.Bea mmz1005y102c-t b 127.7/33.2 ep47 6910018460 s.Bea mmz1005y102c-t t 45.7/57.9 ep48 6910018460 s.Bea mmz1005y102c-t t 91/61.3 ep49...

  • Page 39: Section 7

    Screw abbreviations a, b0, bt: self-tapping ph: pan head zk: black ni-zu: nickel-zinc sus: stainless 7 - 1 section 7 mechanical parts [chassis parts] ref order description qty. No. No. J1 6510004880 mr-dse-01 1 j2 6510004880 mr-dse-01 1 p1 6510009580 zhr-2 1 sp1 2510001160 057p0802 1 mf1 2710000820 ...

  • Page 40

    7 - 2 mp5(c) mp10(c) mp16(c) mf1(c) main unit mp14(c) mp14(c) j2(c) mp7(c) mp18(c) sp1(c) sp1(c) mp20(c) w7(c) mp17(c) ep1(u) j2(c) mp36(c) mp2(c) mp15(c) mp12(c) mp19(c) mp6(c) mp1(c) mp10(m) mp11(m) mp13(c) mp12(m) mp14(m) mp3(c) mp13(m) mp9(c) mp15(m) mp14(m) mp15(m) ic3 (m) ic2 (m) unit abbrevia...

  • Page 41

    8 - 1 section 8 board layouts • main unit (top view) • hm-133 (top view) • control unit (top view) • vr1 unit (top view) • vr2 unit (top view) j1 (chassis) w5 (main unit) j2 (chassis) j9 j5 j8 w6 (main unit) hv gnd 1 j7 sp1 2 j2 8v 1 micu/d extmic ptt mice gnd mic micin 8 j3 1 6 nc cthv gnd rdata tx...

  • Page 42

    8 - 2 s-14325xh-p2 printed in japan © 2007 icom inc. • main unit (bottom view) • hm-133 (bottom view) • control unit (bottom view) • vr1 unit (bottom view) • vr2 unit (bottom view) gnd nc bt one d afout af dmod c5v op+5v ambeepr ambestb amberes ambeclk gnd gpstxd0 gpsrxd0 nc nc amberxd ambetxd dv c ...

  • Page 43

    9 - 1 section 9 block diagram • block diagram (left side) j9 mic mute af amp lpf amp sp1 level conv d/a d/a buff +3 reg lpf level conv reset s16 com a b cr-839 x1 mic amp driver hpf mf1 fun ctrl pwr ctrl j5 +5 reg s15 com a b cr-838 x6 j2 1 2 3 4 5 6 7 8 reset amp eeprom x4 alc amp j8 +8 reg matrix ...

  • Page 44

    9 - 2 • block diagram (right side) rf amp rx sw swr det if amp lpf apc ctrl hpf x3 att rx sw hpf hpf att amp bpf bpf ceramic lpf if amp att rx sw hpf buff rf amp att rf amp bpf att bpf xtal bpf ceramic rf amp x2 jtb450c24 lpf lpf ant sw pll ic hpf hpf bpf ceramic pwr amp bpf rf amp fil loop bpf cera...

  • Page 45

    *; refer to “parts list.” 10 - 1 section 10 voltage diagram 0.01 c25 skqdpa s11 47k r204 1 c72 1ss372 d24 0.01 c74 0.1 c119 0.001 c44 10k r177 47p c7 skqdpa s13 0.001 c42 0.01 c50 0.1 c114 ma8068 d1 2 47k r170 r21 2.2k 2sc4738 q17 2sc4738 q19 47k r168 skqdpa s10 r25 10k 0.001 c105 100 r176 2sc4738 q...

  • Page 46

    *; refer to “parts list.” 10 - 2 10-2 main unit (1) 2sc4738 q97 r514 22k q102 2sc4213 ep63 68k r764 100k r784 100 r835 r489 100 c605 47p 10 msva c656 47k r851 1 c867 mmz1005y102ct ep31 c647 0.0033 r635 330k 10 c697 m pz1608s221a ep60 0.022 c639 r493 100 c654 0. 1 *d128 ep27 tc7w53fu ic61 1 com 2 inh...

  • Page 47

    10 - 3 180k r366 0.01 c530 vdet c432 0. 1 plldata 4.7k r471 10k r398 1.2k r264 vvif r274 330 0.001 c515 r246 100k uuif 470p c570 10k r270 0.01 c472 0.1 c928 100 r793 0.001 c517 l_pllsw 100 r791 r254 47k lt450hw fi3 i o 0.1 c926 r339 3.3k l5v c442 0. 1 l_pllstb r321 2.2k r328 180k tc7w53fu ic11 1 com...

  • Page 48

    10 - 4 unr9114j q8 ma2s077 d36 l30 lqw18an6n8c00 0.001 c9 100 r233 hvc350b d54 0.5p c182 l6 4.7u 0.001 c150 l29 10n 0.001 c65 mmz1608y102bt ep71 ma2s077 d71 0.001 c307 180k r119 0.001 c128 r216 10 as080547 l88 l51 lqw18an24ng00d dan222 d3 1 0.001 c83 1.5p c340 2.2k r9 100k r149 c293 0.001 lqw18anr15...

  • Page 49

    10 - 5 l 1 5 5 68n r 6 9 6 1 . 2 k r733 4.7k l150 0.1u d146 hvc321b d143 ma2s111 r723 10k c743 82p d153 m a2s077 c733 0.001 c767 0.001 l145 c2012c c731 0.001 c798 0.001 1 p c777 r 6 9 7 1 . 2 k r 7 1 7 1 2 0 0 . 0 0 1 c803 d150 ma2s077 d155 1sv308 c763 0.1 sva tc7s66fu ic42 1 2 3 4 5 d148 m a2s077 0...

  • Page 50

    10 - 6 q72 2sc5231 10k r404 hvc362 d89 7p c527 1 c474 1k r423 2p c554 2969 mp 4 1 2 3 4 39n l121 q64 unr9213j upc2709tb ic45 1 in 2 gnd 3 gnd 4 out 5 gnd 6 vcc d107 m a2s077 0.001 c923 0. 1 c401 r433 4.7k hvc375b d91 0 r378 47k r845 33k r847 0.22u l112 d81 ma2s111 4p c524 47n l114 0.001 c444 xp4601 ...

  • Page 51

    Mp2 (c) mp8 (c) mp3 (c) mp9 (c) s1 (m) mp6 (c) mc1 (m) j1 (m) mp4 (c) mp1 (c) mp5 (c) w1 (c) unit abbreviations (c): chassis parts (m): main-a unit main-a unit j1 1 2 3 4 5 6 7 8 q2 q3 q4 q5 q6 q7 q9 d1 d16 7 1 d d18 1 s d 2 s d 3 s d 4 s d 5 s d 6 s d 7 s d 8 s d r g ds11 mc1 s2 s3 s4 s5 s6 s7 s8 s...

  • Page 52

    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 ic1 1180002371 s.Reg r1111n321b-tr-f t 13/6.8 ic101 1130010920 s.Ic ambe-2020 b 9.8/9.5 ic102 1130011930 s.Ic sn74lvc1g04dckr t 4.7/5.1 ic201 1130013440 s.Ic sn74lvc2...

  • Page 53

    12 - 2 • main unit (bottom view) 0 5 c 1 5 c c52 c53 c54 c100 c101 c205 c206 c207 c208 9 0 2 c c210 c212 c352 c353 c354 6 5 3 c 7 5 3 c 8 5 3 c c360 c361 c362 c363 4 6 3 c 0 7 3 c 1 7 3 c ep351 5 5 3 p e 1 0 1 c i 2 0 2 c i ic350 ic352 3 5 3 c i q50 1 5 q 8 1 2 q q219 4 2 2 q 0 5 r r203 r204 r205 r2...

  • Page 54

    &.O3ec#heng4eh2oad4aipei4aiwan2/# 0hone &ax 52, httpwwwasiaicomcom %mailsales asiaicomcom :acdela0laine 2ue"rindejoncdes-oulinais"0 4oulouse#edex&rance 0hone &ax 52, httpwwwicomfrancecom %mailicom icomfrancecom 5nit3ea3t(erne"ay+ent#4,$5+ 0hone &ax 52, httpwwwicomukcouk %mailinfo icomukcouk #tra2ubi...

  • Page 55

    1-1-32, kamiminami, hirano-ku, osaka 547-0003, japan s-14310xz-c1 © 2007 icom inc..