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Icom IC-208H Service Manual

Other manuals for IC-208H: Service Manual, Instruction Manual

Summary of IC-208H

  • Page 1

    Vhf/uhf fm transceiver i208h service manual.

  • Page 2

    Introduction this service manual describes the latest service information for the ic-208h vhf/uhf fm transceiver at the time at 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. This will ruin the transceiver. Do not expos...

  • Page 3

    Table of contents section 1 specifications section 2 inside views section 3 disassembly instructions section 4 circuit description 4 - 1 receiver circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 1 4 - 2 transmitter ci...

  • Page 4: Section 1

    1 - 1 section 1 specifications all stated specifications are subject to change without notice or obligation. M general • frequency range : * 1 guaranteed 144.000 – 146.000 mhz only, * 2 guaranteed 144.000 – 148.000 mhz only, * 3 guaranteed 430.000 – 440.000 mhz only; * 4 guaranteed 440.000 – 450.000...

  • Page 5: Section 2

    Section 2 inside views 2 - 1 • control unit (top view) lcd back light (ds22: cv1074) key back light ds13-ds18,ds20: sml512mw ds21: sml-020myt lcd back light (ds22: cv1074) key back lights ds13-ds18, ds20: sml512mw ds21: sml-020myt • main unit (top view) vco board ee prom (ic501: hn58x24128fpi) af am...

  • Page 6

    • control unit (bottom view) color controller (q6,q7: 2sc4116) control unit cpu (ic6: hd6433842rb36h) reset ic (ic2: s-80945clmc-g7f) +5v regurator ic5: ta78l05f d4: ma8062 +8v regurator q1: 2sc4116 q3: 2sa1734 d5: ma8068 color controller (q6, q7: 2sc4116) control unit cpu (ic6: hd6433842rb36h) rese...

  • Page 7: Section 3

    Section 3 disassembly instructions • removing the main unit ➀ unscrew 4 screws a , and remove the cover. ➁ disconnect the cable b from j505, and remove the speaker. ➂ remove 2 sheets c . ➆ unscrew 8 screws g , and remove the main unit. J505 j505 b c a a ➃ unsolder 3 points d . ➄ disconnect the cable...

  • Page 8

    • removing the control unit ➀ remove 2 knobs a . ➂ unscrew 2 screws c , and remove the lcd plate. ➃ remove the control unit. A ➁ unscrew 2 screws b , and remove the cover. B c control unit 3 - 2.

  • Page 9: Section 4

    4 - 1 4-1 receiver circuits 4-1-1 duplexer circuit (main unit) the transceiver has a duplexer (low-pass and high-pass fil- ters) on the first stage from the antenna connector to sepa- rate the signals into vhf, uhf and above 800 mhz signals. The 2 of low-pass filters (l51, l52, l56, c295, c299 and l...

  • Page 10

    4 - 2 • above 230 mhz rf circuit (230 mhz–550 mhz, except 430 mhz–440 mhz) the signals from the attenuator circuit pass through the tun- able bandpass filter (d36, l37, l38, c242, c253, c261). The filtered signals are amplified at the above 230mhz rf amplifier (q40) and are then enter another 2-stag...

  • Page 11

    4 - 3 • in case of fm signal receiving the signal is then amplified at the limiter amplifier section (ic5, pin 5) and applied to the fm detector section (x2, ic5, pins 10, 11) for demodulation the 2nd if signal into af sig- nals. The fm detector circuit employs a quadrature detection method (liner p...

  • Page 12

    4 - 4 the signal from the am detector circuit (q13) is detected at the agc detector circuit (d19–d21). When receiving strong signals, the detected voltage increases and the agc voltage decreases via the agc circuit. The agc voltage is used for the bias voltage of the receive switching pin diodes to ...

  • Page 13

    4 - 5 4-2-3 vhf drive amplifier circuit (main unit) the drive amplifier circuit amplifies the vco oscillating sig- nal to a level needed at the power amplifier. The rf signals from the low-pass filter (vco board) pass through the attenuator (r133, r134, r137), and are then amplified at the pre-drive...

  • Page 14

    4 - 6 4-2-7 uhf drive amplifier circuit (main unit) the rf signals from the low-pass filter (vco board) pass through the high-pass filter (l69, c119) and attenuator (r135, r136, r138), and are then amplified at the pre-drive (q31) and drive (q34, d14) amplifiers to obtain power that ic14 can operate...

  • Page 15

    4 - 7 4-3-3 uhf loop (vco board and main unit) the generated signal at the u-vco (q101, d100, d101) enters the pll ic (main unit; ic2, pin 8) via buffer-ampli- fiers (q102, q50) and vco switching circuit (d51) and is divided at the programmable divider section and is then applied to the phase detect...

  • Page 16

    4 - 8 4-4 other circuits 4-4-1 sub-cpu reset circuit (control unit) ic2 is the reset voltage detecting circuit. The output voltage from the +5 regulator circuit (ic5) is applied to the vdd ter- minal (ic2, pin 2). Ic2 outputs “h” (high) signal to the sub- cpu (ic6, pin 15) when the vdd terminal’s vo...

  • Page 17

    4 - 9 50 51 52 53 55 56 57 58 62 63 65 66 67 72 73 74 77 78 input port for the cloning signal. Outputs the data signal to the d/a converter (ic11, pin 17). Outputs the clock signal to the d/a converter (ic11, pin 16). Outputs the strobe signal to the d/a converter (ic1, pin 15). Outputs the af mute ...

  • Page 18

    4 - 10 79 81 83 84 86–89 90 91 93–96 99 outputs the vco circuit select signal. High : the vco circuit oscillates 203.95–263.945 mhz signal. Outputs the vhf vco select signal. High : the vhf vco’s power supply (q6, q8) is on. Outputs the pll loop control signal. Input port for the pll unlock signal. ...

  • Page 19

    5 - 1 5-1 preparation need to enter the adjustment mode, and the jig calble as shown the page 5-2 is required when adjusting the ic-208h. ■ required test equipment dc power supply rf power meter (terminated type) frequency counter standard signal generator (ssg) fm deviation meter oscilloscope audio...

  • Page 20

    5 - 2 ‘ ‘ connections pin 6 (mic) pin 4 (ptt) pin 7 (gnd) pin 2 (micu/d) pin 5 (mice) to the antenna connector standard signal generator 0.1 300 mhz 127 to 17 dbm (0.1 v to 32 mv) rf power meter 50 , 1 80 w fm deviation meter attenuator 50 db or 60 db power supply 13.8 v, 20 a or more caution! Do no...

  • Page 21

    5 - 3 5-2 software adjustments (transmitting) reference frequency [fr] reference voltage [re] vhf output power (high) [poh] (middle) [pom] (low) [pol] uhf output power (high) [poh] (middle) [pom] (low) [pol] transmit minimum voltage [pl] protect voltage [pv] 1 1 1 2 3 1 2 3 1 2 3 1 2 • operating fre...

  • Page 22

    5 - 4 software adjustments (transmitting and receiving)–continued frequency deviation (vhf band) [de] (uhf band) [de] dtcs wave form (vhf band) [de] (uhf band) [de] tracking (low band) [tr] (middle1 band) [tr] 1 2 3 4 1 2 1 2 3 4 5 6 7 8 • operating frequency : 144.0 mhz • connect an audio generator...

  • Page 23

    5 - 5 software adjustment (receiving)–continued tracking (middle2 band) [tr] (high band) [tr] s-meter [sl] 9 10 11 12 13 14 15 1 2 3 4 • operating frequency : 400.1 mhz • connect an ssg to the antenna connector and set as level : 1 µv* (–107 dbm) modulation : 1 khz deviation : ± 3.5 khz • receiving ...

  • Page 24

    5 - 6 software adjustment (receiving)–continued squelch level (wide) [sqw] (narrow) [sqn] temp. Correction (vhf –10˚c) [hp–] (vhf +60˚c) [hp–] (vhf –10˚c) [mp–] (vhf +60˚c) [mp–] (vhf –10˚c) [lp–] (vhf +60˚c) [lp–] 1 2 3 4 5 6 7 8 1 2 3 4 5 6 • operating frequency : 146.1 mhz • connect an ssg to the...

  • Page 25

    5 - 7 software adjustment (receiving)–continued temp. Correction (uhf –10˚c) [hp–] (uhf +60˚c) [hp–] (uhf –10˚c) [mp–] (uhf +60˚c) [mp–] (uhf –10˚c) [lp–] (uhf +60˚c) [lp–] protect scale (vhf) [pm] (uhf) [pm] protect power (vhf) [pp] (uhf) [pp] 1 2 3 4 5 6 1 2 1 2 • operating frequency : 445.0 mhz •...

  • Page 26: Section 6

    [control unit] [control unit] ic2 1110005780 s.Ic s-80945clmc-g7f-t2 b ic5 1180000420 s.Ic ta78l05f (te12r) b ic6 1140011370 s.Ic hd6433842rd36h (fx2633d) b q1 1530002690 s.Transistor 2sc4116-gr (te85r) b q2 1590001650 s.Transistor xp4601 (tx) b q3 1510000690 s.Transistor 2sa1734 (te12r) b q6 153000...

  • Page 27

    [vco unit] [vco unit] d106 1790001620 s.Diode 1sv308 (tpl3) t d107 1790001260 s.Diode ma2s077-(tx) b l1 6200001980 s.Coil nl 252018t-1r0j t l2 6200010100 s.Coil c2012c-33ng t l3 6200010210 s.Coil c2012c-22ng t l4 6200006980 s.Coil eljre r10g-f t l5 6200003540 s.Coil mlf1608d r22k-t t l6 6200006990 s...

  • Page 28

    [main unit] [vco unit] c124 4030006980 s.Ceramic c1608 ch 1h 070d-t t c125 4030006860 s.Ceramic c1608 jb 1h 102k-t t c126 4030006950 s.Ceramic c1608 ch 1h 040c-t t c127 4030009520 s.Ceramic c1608 ch 1h 020b-t t c128 4030007130 s.Ceramic c1608 ch 1h 101j-t t c129 4030009510 s.Ceramic c1608 ch 1h 010b...

  • Page 29

    [main unit] [main unit] d34 1790000980 s.Diode ma742 (tx) b d36 1750000610 s.Varicap ma2sv0500l t d37 1720000700 s.Varicap 1sv305 (tpl3) t d38 1790001260 s.Diode ma2s077-(tx) t d39 1790001160 s.Diode 1ss362 (te85r) t d40 1750000510 s.Diode um9401f t d41 1750000720 s.Varicap hvc375btrf t d42 17900016...

  • Page 30

    [main unit] [main unit] r39 7030003680 s.Resistor erj3geyj 104 v (100 k Ω ) t r40 7030003700 s.Resistor erj3geyj 154 v (150 k Ω ) b r41 7030003720 s.Resistor erj3geyj 224 v (220 k Ω ) b r42 7030003580 s.Resistor erj3geyj 153 v (15 k Ω ) t r43 7030003560 s.Resistor erj3geyj 103 v (10 k Ω ) t r44 7030...

  • Page 31

    [main unit] [main unit] r212 7030003720 s.Resistor erj3geyj 224 v (220 k Ω ) t r213 7030003440 s.Resistor erj3geyj 102 v (1 k Ω ) t r214 7030003360 s.Resistor erj3geyj 221 v (220 Ω ) t r217 7030003640 s.Resistor erj3geyj 473 v (47 k Ω ) t r218 7030003680 s.Resistor erj3geyj 104 v (100 k Ω ) t r219 7...

  • Page 32

    [main unit] [main unit] r621 7030003640 s.Resistor erj3geyj 473 v (47 k Ω ) t r622 7030003660 s.Resistor erj3geyj 683 v (68 k Ω ) b r623 7030003680 s.Resistor erj3geyj 104 v (100 k Ω ) b r624 7030003800 s.Resistor erj3geyj 105 v (1 m Ω ) b r625 7030003520 s.Resistor erj3geyj 472 v (4.7 k Ω ) b r626 ...

  • Page 33

    [main unit] [main unit] c143 4030006860 s.Ceramic c1608 jb 1h 102k-t b c144 4030006860 s.Ceramic c1608 jb 1h 102k-t t c145 4030007090 s.Ceramic c1608 ch 1h 470j-t t c146 4030006860 s.Ceramic c1608 jb 1h 102k-t t c147 4030006860 s.Ceramic c1608 jb 1h 102k-t b c148 4030009560 s.Ceramic c1608 ch 1h r75...

  • Page 34

    [main unit] [main unit] c512 4030006860 s.Ceramic c1608 jb 1h 102k-t t c513 4030011600 s.Ceramic c1608 jb 1e 104k-t t c514 4030009910 s.Ceramic c1608 ch 1h 040b-t b c515 4030006860 s.Ceramic c1608 jb 1h 102k-t b c516 4030006860 s.Ceramic c1608 jb 1h 102k-t t c517 4030007090 s.Ceramic c1608 ch 1h 470...

  • Page 35

    [main unit] w506 7030000010 s.Jumper mcr10ezhj jpw (000) t w507 7030003860 s.Jumper erj3ge jpw v t w508 7030003860 s.Jumper erj3ge jpw v t w509 7030000010 s.Jumper mcr10ezhj jpw (000) t w510 7030003860 s.Jumper erj3ge jpw v t w511 7030003860 s.Jumper erj3ge jpw v b w512 7030003860 s.Jumper erj3ge jp...

  • Page 36: Section 7

    Section 7 mechanical parts and disassembly 7 - 1 j1 6510004880 connector mr-ds-e 01 1 sp1 2510001160 speaker 057p0802 1 mf1 2710000760 fan fd1240107b-1n 1 mp1 8010019240 2633 chassis 1 mp2 8930059790 2633 sp rubber 1 mp3 8930041552 1893 opc plate-2 1 mp4 8930041560 1893 release button 1 mp5 88100086...

  • Page 37

    7 - 2 mf1(c) mp21(c) mp20 (c) mp8 (m) mp10 (m) mp8 (c) mp27 (c) mp26 (c) mp1 (m) mp19 (c) mp10 (c) mp11 (c) mp6 (c) j1 (c) mp1 (c) mp17 (c) mp4 (c) mp3 (c) mp12 (c) mp26 (ct) mp1 (m) mp5 (m) mp2 (ct) mp25 (ct) ds22 (ct) r1 (ct) mp21 (ct) mp18 (ct) mp7 (ct) mp17 (ct) mp6 (ct) mp5 (ct) s1 (ct) r5 (ct)...

  • Page 38

    8 - 1 section 8 semi-conductor information • transistors and fet’s • diodes b e c b e c b e c b c e b e c c e b b c e b c e b e c b e c b e c b e c b e c b e c b e c b e c b e c b e c b e c e c b e d g s d s g2 g1 e1 b1 b2 c1 c2 b e c b e c b e c b e c b e c b e c b e c b1 e b2 c1 c2 e1 c2 b1 c1 e2 ...

  • Page 39

    Section 9 board layouts 9 - 1 9-1 control unit • top view set lock s.Mw mw v/mhz scan m/call prio tone t-scan low dup moni dtmf sql pwr vol band.

  • Page 40

    • bottom view (control unit) 1 100 76 75 25 26 50 51 hv 1 4 to main unit j503 j3 td a t a rd a t a gnd 9 - 2.

  • Page 41

    1 7 14 8 1 4 8 5 1 4 8 5 1 8 16 9 1 8 16 9 1 10 20 11 1 1 4 8 5 4 8 5 1 25 75 76 100 50 26 51 5 8 4 1 1 3 6 4 ant chassis j2 fa n - 1 to fan 2 j1 f an+ chassis w501 red black sp+ 1 2 to speaker j505 gnd afout 5 6 3 1 2 4 j504 psql pttp datain gnd dataout da t a sp 7 1 to microphone 8 2 j502 gnd mice...

  • Page 42

    1 12 24 13 1 7 14 8 1 8 16 9 1 4 8 5 1 4 8 5 out vdd ic13 vg g in out ic14 vdd vg g in • bottom view (main unit) 9 - 4.

  • Page 43

    9-3 vco board • top view * * mounted r127 in place of w1 ([usa], [e208] only) 9 - 5.

  • Page 44

    • bottom view (vco board) * *mounted r128 in place of w2 ([usa], [e208] only) v_lv 1 to main unit 10 j1 v_vco8 vco_shift u_lv gnd mmute mod gnd u_vco8 8v v_txlo 1 10 to main unit j2 v_rxlo gnd u_txlo u_rxlo gnd ur5 800r5 gnd pllout 9 - 6.

  • Page 45

    Section 10 block diagram tx line note: rx line common line data bus line 8v micu/d extmic ptt mice mic gnd micin j502 8v 6 4 2 5 3 1 pttp sw q507 unr9113j datain j504 dataout psql sw q508 unr9213j + - sp501 m + - mf1 fan fun ctrl chassis unit antenna j506 afo q15,q17 2sc4116 matrix matorix_in1-4 out...

  • Page 46

    Section 11 voltage diagrams 11-1 control unit s5 r5 evu-f2af20b55 r1 evu-f2af20b55 c50 0.001 q2 xp4601 1 2 3 4 5 6 r9 47k r25 10k ep11 s7 c10 100p r29 10k c7 100p jrs0000-1401 s1 1 com 2 a 3 b c49 0.01 s6 c1 0.0047 c36 0.1 4.7k r42 c3 0.0047 c37 0.1 r6 1k r75 10k r24 4.7k r23 10k ma8062 d4 c29 4.7k ...

  • Page 47

    11-2 main unit data afout r583 c574 10 c573 1 10k r605 d521,d522 1ss400 except [exp] 1ss400 [tpe],[kor],[eur-1] d511-d514,d516-d519 d510 1ss400 [itr],[tpe],[kor] d509 1ss400 [ic-e208] d508 1ss400 [tpe],[kor],[aus] d507 1ss400 [eur],[tpe],[exp],[eur-1] 5vs_w 5vs hv hv_i 8v 8v 8v hv 5vs 8v hv 5vs 8v h...

  • Page 48

    4.7k r124 47p c6 [eur],[itr],[usa],[eur-1] only w528 10p c667 [eur-1]only [eur],[itr],[usa], [exp] only [tpe],[kor],[aus] 47 [other] 4.7k [tpe],[kor],[aus],[exp] 22k r52 56n l50 j2 u_rxlo u_txlo gnd pllout v_txlo 800r5 ur5 gnd v_rxlo gnd pllout gnd 800r5 ur5 gnd u_rxlo u_txlo gnd v_rxlo v_txlo 8v u_...

  • Page 49

    0.01 c274 unr9113j q42 8v 5vs_w 5vs_w 8v 8v 8v 8v 8v 5vs_w 5vs_w 5vs_w 5vs_w 5vs_w 8v 8v 8v 8v 8v 5vs_w 5vs_w 5vs_w 5vs_w hv_i 5vs_w hv_i 5vs_w hv_i 0.001 c234 tx_mute tx_mute r unr9113j q45 p n 0.001 c581 100 r616 w527 q tune_8 100p c70 10 c63 120k r75 mod l i h 0.001 c650 w v 0.001 c626 0.001 c630...

  • Page 50

    1k r240 1p c206 220 c646 47p c617 47p c616 5vs_w hv_i hv_i hv_i hv_i 5vs_w 5vs_w v_rxlo 5vs_w 630-999.990mhz 230-630mhz 118-174mhz w543 w541 w542 w539 w540 w537 w538 w535 w536 w533 w534 w531 w532 w530 w529 w2 w3 0.001 c609 ep520 s t 5p c243 220 r641 4p c599 w506 0.001 c167 g f unr9115j q43 0.001 c21...

  • Page 52

    1-1-32, kamiminami, hirano-ku, osaka 547-0003, japan s-14001hz-c1 c 2003 icom inc..