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Icom IC-4008A Service manual

Other manuals for IC-4008A: Instruction Manual, Service Manual

Summary of IC-4008A

  • Page 1

    Service manual uhf fm transceiver lpd fm transceiver.

  • Page 2

    Introduction danger ordering parts repair notes this service manual describes the latest service information for the at the time of publication. Never connect the transceiver to an ac outlet or to a dc power supply that uses more than 5 v. Such a connection could cause a fire hazard and/or electric....

  • Page 3

    Table of contents section 1 specifications section 2 inside views section 3 disasembly instruction section 4 circuit description 4-1 receiver circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1 4-2 transmiter circuits . . . . . . . . ...

  • Page 4: Section 1

    Section 1 specifications 1 - 1 all stated specifications are subject to change without notice or obligation. Number of channels type of emission frequency stability frequency resolution power supply requirements (negative ground) current drain operating temperature range number of ctcss frequency di...

  • Page 5

    Channel frequency list ctcss frequency list 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 433.0750 433.1000 433.1250 433.1500 433.1750 433.2000 433.2250 433.2500 433.2750 433.3000 433.3250 433.3500 433.3750 433.4000 433.4250 433.4500 433.4750 433.5000 433.5250 433.5500 433.5750 433.600...

  • Page 6: Section 2

    Section 2 inside views 2 - 1 • main unit • rf unit t+3 regurator (q28: 2sb798) +3 regurator (ic6: s-81230sg) r+3 regurator (q18: 2sa1586) cpu (ic1: µ pd753036gk) audio amplifier (ic9: njm2070m) eeprom (ic3: x24c01as) top veiw bottom veiw 1st mixer (q2: 2sc4226) pll ic (ic1: tb31202fn) 2nd if filter ...

  • Page 7: Section 3

    Section 3 disasembly instructions 3 - 1 a b b main unit rf unit e c d f h g • removing the rear panel unscrew 1 screw , and 4 screws . Remove the rear panel in the direction of the arrow. • removing the rf unit remove 1 knob, , and unscrew 1 nut, . Unsolder 1 point, , and then remove the rf unit. • ...

  • Page 8: Section 4

    4 - 1 section 4 circuit description 4-1 receiver circuits 4-1-1 antenna switching circuit (rf unit) received signals from the antenna connector are passed through the low-pass filter (l5, l6, c8–c12). The filtered sig- nals are applied to the λ ⁄ 4 type antenna switching circuit (d7, d101, d102, l4,...

  • Page 9

    4 - 2 • pll circuit shift register prescaler phase detector loop filter programmable counter programmable divider x1 21.25 mhz to the fm if ic (ic2, pin 1) vco buffer q7 6 7 8 stb ic1 (pll ic) ck data to transmitter circuit to 1st mixer circuit d2 d1 9 11 14 16 q6, d4, d5 4-1-6 squelch circuit (rf a...

  • Page 10

    4 - 3 line batt 3v +3v r+3 t+3 description the voltage from the connected battery pack. Common 3 v converted from the batt line at the 3v regulator circuit (ic6). The circuit outputs the voltage regardless of the power on/off condition. Common 3 v converted from the batt line at the +3v regulator ci...

  • Page 11: Section 5

    5 - 1 section 5 adjustment procedures 5-1 preparation required test equipment equipment dc power supply rf power meter (terminated type) frequency counter fm deviation meter dc voltmeter grade and range output voltage : 4.5 v dc current capacity : 1 a or more measuring range : 1 mw–1 w frequency ran...

  • Page 12

    5 - 2 5-2 adjustment reference frequency output power fm deviation squelch adjustment adjustment adjustment condition measurement value point unit location unit adjust 433.925000 mhz 9 mw [ita/–1] 470 mw [csa/–1] ±4.8 khz 10 mv ±3 db audio signal disappears. 1 1 1 2 1 2 • operating channel : ch 35 •...

  • Page 13

    5 - 3 rf gnd j1 rf test por r50 fm deviati reference frequency adjustment r206 output power adjustment test c63 entering the adjustment mode q turn the transceiver power off. W while connecting the "test" to gnd, then turn power on..

  • Page 14: Section 6

    Section 6 parts list 6 - 1 ic1 1140006881 s.Ic µpd753036gk-524-be9 ic2 1110002820 s.Ic njm2100m-t1 ic3 1140004450 s.Ic x24c01as-3.0t6 ic5 1110004710 s.Ic s-80928anmp-ddr-t2 ic6 1180001150 s.Ic s-81230sg-qb-t1 ic9 1110002810 s.Ic njm2070m-t1 q1 1590000720 s.Transistor dta144eua t106 q2 1590001860 s.T...

  • Page 15

    6 - 2 c8 4510004630 s.Electrolytic ecev1ca100sr c9 4030006850 s.Ceramic c1608 jb 1h 471k-t-a c10 4030006850 s.Ceramic c1608 jb 1h 471k-t-a c11 4030006850 s.Ceramic c1608 jb 1h 471k-t-a c15 4030011600 s.Ceramic c1608 jb 1c 104kt-n c17 4550006880 s.Tantalum temsvd2 0j 157m-12r c18 4510004630 s.Electro...

  • Page 16

    6 - 3 l206 6200005690 s.Coil eljre 18ng-f l207 6200005690 s.Coil eljre 18ng-f l208 6200003640 s.Coil mlf1608k 100k-t r1 7030003430 s.Resistor erj3geyj 821 v (820 Ω ) r2 7030003670 s.Resistor erj3geyj 823 v (82 k Ω ) r3 7030003470 s.Resistor erj3geyj 182 v (1.8 k Ω ) r4 7030003450 s.Resistor erj3geyj...

  • Page 17

    6 - 4 c211 4030006860 s.Ceramic c1608 jb 1h 102k-t-a j1 6910007660 connector imsa-9210b-1-02t j2 6510018170 s.Connector 4-175643-4 w4 7030003860 s.Jumper erj3ge jpw v w5 7030003860 s.Jumper erj3ge jpw v w6 7030003860 s.Jumper erj3ge jpw v w8 7030003860 s.Jumper erj3ge jpw v w201 7030003860 s.Jumper ...

  • Page 18: Section 7

    Section 7 mechanical parts and disassembly 7 - 1 screw abbreviations a, b0, bt: self-tapping ph: pan head fh: flat head bih: bind head ni: nickel sus: stainless zk: black sp1 2510000960 speaker k036na500-26a27 1 ep1 3310002090 antenna 2045ant 1 mp1 8210015181 panel 2045 front panel-1 [ita], [csa] 1 ...

  • Page 19

    7 - 2 unit abbreviation (c): chassis parts, (rf): rf unit, (m): main unit mp1 (c) sp1 (c) mp10 (c) mp12 (c) ep1 (m) ds2 (m) mp7 (c) mp5 (c) main unit mp20 (c) mp25 (c) mp14 (c) mp23 (c) mp11 (c) mp13 (c) mp4 (c) mp2 (c) mp25 (c) mp9 (c) mp8 (c) rf unit mp24 (c) mp30 (c) mp24 (c) mp22 (c) ep1 (c) mp3...

  • Page 20

    Section 8 semi-conductor information 8 - 1 • diodes • transistor and fet’s 2sa1362 gr (symbol: aeg) 2sc4213 b (symbol: ab) 2sc5108 y (symbol: mc) dta114 eu (symbol: 16) un5119 (symbol: 6k) un9215 (symbol: 8e) dtc114 eu (symbol: 14) mrf9745 (symbol: m745) umz1n (symbol: z1) umz2n (symbol: z2) 2sc5194...

  • Page 21: Section 9

    Section 9 board layouts 9-1 main unit • top view (ic-4008a) 9 - 1 c20 r98 r74 r76 c53 c60 ic5 c55 c88 r78 w7 c80 r42 r12 r46 r50 c5 r31 r1 18 c3 r9 r1 10 c25 c7 c79 c4 q6 r13 q3 r10 r202 c35 c34 r45 r36 c36 c31 r43 r37 r41 c32 r38 c90 c8 q7 mc1 c64 q25 d4 c62 c65 c89 r77 c67 r80 q18 c17 c52 c18 c49 ...

  • Page 22

    9 - 2 • bottom view (ic-4008a) r58 r88 r54 q10 c21 c47 c44 c72 r87 c59 r106 c82 r112 c46 c87 r103 c51 r62 c92 c94 r97 r63 c45 r79 c86 r68 r69 ic3 q23 r86 ic9 j4 j1 j3 s1 x1 q5 c6 c29 r6 r7 r5 r4 r40 r105 r32 r34 c26 c40 c27 c1 1 r33 r2 r108 w1 w4 r60 q1 c73 c83 r51 r52 c93 c24 r53 c98 r39 r102 q2 c2...

  • Page 23

    9 - 3 c57 ic6 c20 q14 ic5 c63 q27 q1 1 r26 r49 w3 c74 d303 d5 ds2 c55 c17 c52 c18 c48 c49 r23 r114 r302 r89 c9 c42 c75 r90 c71 q28 d101 c97 r74 r76 r98 c53 c60 c81 c96 d2 ds1 c95 r61 c15 r22 r27 c50 r24 r25 r56 r55 c88 r78 q18 q25 d4 w7 c80 c64 c67 c62 r42 r43 c90 mc1 r37 r46 r13 c79 c4 r50 c5 c7 c8...

  • Page 24

    9 - 4 r58 ic9 c6 ic2 c29 c73 r39 r99 r100 r101 r35 c91 c10 r14 r64 w1 w4 q1 r60 r108 r2 r4 r5 q2 q12 q29 c28 r102 r40 r32 r105 c26 c27 c40 r95 c1 1 r34 r33 r65 r6 r7 c24 r53 r66 c1 c85 r30 c83 r51 r52 c93 c98 q10 c59 c72 c82 j1 s1 j3 q23 r87 r106 r301 r112 r81 r72 c61 c56 c54 r94 c46 r63 c45 r79 c87...

  • Page 25

    9 - 5 9-2 rf unit • top view r69 r67 r71 r66 c89 r68 c96 l6 l204 l203 d103 l5 l23 c90 c36 c4 r12 c70 c23 r86 q14 q13 d9 d8 c81 c82 c48 c43 c86 ic1 r64 r65 r32 r27 c13 r60 r19 r4 c28 c3 l25 c67 r58 q2 j2 r5 c46 l1 c11 c72 r209 r213 r202 w202 w201 l201 c201 c203 c204 l202 c26 q201 q202 r205 r93 c87 c6...

  • Page 26

    9 - 6 • bottom view c79 c83 x1 c63 r52 r88 c15 c16 c69 c55 r36 c57 l14 c64 r34 c52 r31 c53 q6 l13 r54 c50 r30 r29 c20 l11 d4 d5 r35 r33 l12 q7 q12 c84 c56 c51 r210 q8 c60 fi1 fi2 w8 q1 r3 r2 fi3 j1 r50 r206 c88 c85 r211 c211 l207 l105 l19 c102 r212 c21 c42 c100 r208 r6 c35 c45 r53 r55 r61 l21 r37 r3...

  • Page 27

    Section 10 block diagram 10 - 1 ctcin d/a remin ptt2 micsw rmut afon rxv txv power lcd ds2 volt sens reset ic5 x2 cdbca450cx24 (450 khz) fi3: cfwm450e ceramic bpf (450 khz) fmdet s det if amp noise det ic2 ta31136fn 2sc4215 q13: 2sc4081 q14: 2sa1586 d8 : 1ss355 d9 : 1ss355 fl-298 q6: 2sc5108 d4,d5: ...

  • Page 28

    Section 11 voltage diagram 11 - 1 11-1 main unit lon: 0 lof: 3.02 lon: 2.82 lof: 0 c: 3.02 t: 3.04 r: 2.40 c: 3.82 c: 3.10 c: 1.65 t: 0 r: 0.86 c: 1.95 t: 0 r: 2.97 c: 3.12 t: 0 r: 3.02 c: 3.10 t: 1.58 r: 0 t: 3.05 r: 0 t: 1.46 r: 0 c: 0 c: 3.12 t: 1.48 r: 0 t: 1.45 r: 0 c: 2.50 c: 3.13 t,sc: 0.49 s...

  • Page 29

    11-2 rf unit 11 - 2 t: 0 r: 2.96 t: 0 r: 0.72 t: 0 r: 1.86 t: 0 r: 2.60 t: 0 r: 1.76 t: 0 r: 0.72 t: 0 r: 1.98 c: 2.83 c: 2.80 t: 0 r: 1.12 t: 1.16 r: 0 t: 0.42 r: 0.36 t: 0.72 r: 0 t: 1.38 r: 0 t: 1.51 r: 0 t: 0.75 r: 0.84 t: 1.20 r: 0 t: 0 r: 0.82 t: 0.57 r: 0 t: 1.47 r: 0 t: 0 r: 2.61 t: 0 r: 0.9...

  • Page 30

    6-9-16, kamihigashi, hirano-ku, osaka 547-0002, japan phone : 06 6793 5302 fax : 06 6793 0013 communication equipment himmelgeister str. 100, d-40225 düsseldorf, germany phone : 0211 346047 fax : 0211 333639 url : http://www.Icomeurope.Com unit 9, sea st., herne bay, kent, ct6 8ld, u.K. Phone : 0122...

  • Page 31

    6-9-16, kamihigashi, hirano-ku, osaka, 547-0002, japan a-5505i-s printed in japan © 1998 by icom inc..