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Icom IC-F51 manual

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Table of contents for the manual

  • Page 1

    SER VICE MANU AL VHF TRANSCEIVER[...]

  • Page 2

    INTRODUCTION D ANGER ORDERING P ARTS REP AIR NO TES This ser vice manual describes the latest ser vice information f or the IC-F50/IC-F51 VHF TRANSCEIVER at the time of publication. NEVER connect the transceiv er to an AC outlet or to a DC power supply that uses more than 8 V . Such a connection could cause a fire or electric hazard. DO NO T e xpos[...]

  • Page 3

    T ABLE OF CONTENTS SECTION 1 SPECIFICA TIONS SECTION 2 INSIDE VIEWS SECTION 3 DISASSEMBL Y INSTRUCTIONS SECTION 4 CIRCUIT DESCRIPITON 4-1 RECEIVER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 -1 4-2 TRANSMITER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .[...]

  • Page 4

    1 - 1 SECTION 1 SPECIFICA TIONS ‘ ‘ GENERAL • Frequency coverage : 136.000–174.000 MHz • Mode : FM • T ype of emission : • Number of conventional channels : 128 ch, 8banks • Antenna connector : SMA type (50 Ω ) • Operating temperature range : –30 ˚C to +60˚C (–22 ˚F to +140˚F) [USA], [GEN] –25 ˚C to +55˚C [EUR] • P[...]

  • Page 5

    SECTION 2 INSIDE VIEWS • MAIN UNIT 2 - 1 • FRONT UNIT APC amplifier (IC2: T A75S01F) +5 Regurator (IC9: NJM2870) IF amplifier (Q4: 2SC4215) IF IC (IC1: T A31136FN) Antenna switching circuit (D2,D5: 1SV307) Analog switch (IC13: BU4066BCFV) Baseband IC (IC10: AK2346) Expander IC (IC12: BU4094BCFV) D/A conv er ter (IC6: M62363FP) Po w er amplifier[...]

  • Page 6

    SECTION 3 DISASSEMBL Y INSTR UCTIONS 3 - 1 Chassis unit B C D F G E H A E F Shield cover L L K I I K J J Main unit Chassis unit N N Front unit M O • REMO VING THE CHASSIS UNIT 1 Unscrew 1 n ut A , and remove 1 knob B . 2 Remov e 1 washer c , and unscrew 1 scre w D . 3 Unscrew 2 scre ws E , and remove 2 w ashers F . 4 Unscrew 2 scre ws G . 5 Ta ke[...]

  • Page 7

    4 - 1 SECTION 4 CIRCUIT DESCRIPTION 4-1 RECEIVER CIRCUITS 4-1-1 ANTENNA SWITCHING CIRCUIT (MAIN UNIT) The antenna switching circuit functions as a low-pass filter while receiving and a resonator circuit while transmitting. This circuit does not allow transmit signals to enter the receiver circuits. Received signals enter the antenna connector (CHAS[...]

  • Page 8

    4 - 2 4-1-5 AF AMPLIFIER CIRCUIT (MAIN AND FRONT UNITS) The AF amplifier circuit amplifies the demodulated AF sig- nals to drive a speaker . This transceiver employs the base band IC which is composed of pre-amplifier , expander , scrambler , MSK de-modulator , etc. at the AF amplifier sec- tion. The AF signals from the FM IF IC (IC1, pin 9) are am[...]

  • Page 9

    4 - 3 4-2-2 MODULA TION CIRCUIT (MAIN UNIT) The modulation circuit modulates the VCO oscillating signal (RF signal) using the microphone audio signals. The AF signals from the D/A converter (IC6, pin 3) change the reactance of varactor diode (D18) to modulate the oscil- lated signal at the TX VCO circuit (Q13, D16, D17). The modulated VCO signal is[...]

  • Page 10

    4 - 4 4-3-2 VCO CIRCUIT (MAIN UNIT) The VCO circuit contains a separate RX VCO (Q14, D19, D20) and TX VCO (Q13, D16, D17). The oscillated signal is amplified at the buffer amplifiers (Q10, Q12) and is then applied to the T/R switch (D14, D15). Then the receive 1st LO (Rx) signal is applied to the 1st mixer (Q3) and the trans- mit (Tx) signal to the[...]

  • Page 11

    4 - 5 4-5 OTHER CIRCUITS 4-5-1 COMPOUNDER CIRCUIT (MAIN UNIT) IC-F50/F51 have compounder circuit which can improve S/N ratio and become wide dynamic range to suppress the transmitting signal and to extend receiving signal. The circuit is composed of the base band IC (MAIN unit; IC10). (1) IN CASE OF TRANSMITTING The audio signals from the microphon[...]

  • Page 12

    4 - 6 4-6-2 MAIN CPU (FRONT unit; IC401) Input port for the PTT switch detection signal. Low: While the PTT switch is pushed. Input ports for the key return A/D sig- nals. Input port for the detect signal for con- necting battery pack ’ s voltage. Input port for the PLL lock voltage . Input port for the S-meter signal from the FM IF IC (MAIN unit[...]

  • Page 13

    4 - 7 4 5 6 7 11 12 13 14 LEDR LEDT LIGT AFON DUSE MCON CSFT SPON Outputs RX LED control signal. Low: Lights ON. Outputs TX LED control signal. Low: Lights ON. Outputs back light LED control signal. Low: Back light is ON. Outputs audio control signal. Low: Outputs audio signals from speaker . • Outputs CTCSS/DTCS switching sig- nal when transmitt[...]

  • Page 14

    5 - 1 SECTION 5 ADJUSTMENT PROCEDURES 5-1 PREP ARA TION When adjusting IC-F60/F61, the optional CS-F50 ADJ ADJUSTMENT SOFTW ARE (Rev . 1.0 or later), *OPC-966 JIG CABLE (modified OPC-966 CLONING CABLE ) are required. ■ REQUIRED TEST EQUIPMENT ■ SYSTEM REQUIREMENTS • Microsoft ® Windows ® 95 or Windows ® 98 • RS-232C serial port ■ ADJUS[...]

  • Page 15

    5 - 2 CS-F50 ADJ Rev .1.0 File COM 1: OPEN Option Connect Reload (F5) Disp para [A / D] VIN : 203 : CBh : 7.96 V TEMPS : 190 : BEh : 32.23 'C L VIN : 110 : 6Eh : 2.16 V SD : 31 : 1Fh : 0.61 V S MTR : P ower (Hi) : 155 [ # # # # # # # # # # # # ] P ower (L2) : 82 [ # # # # # # ] P ower (L1) : 51 [ # # # # ] BAL N : 84 [ # # # # # # # ] BAL Rati[...]

  • Page 16

    5 - 3 + Add a jumper wire here Electro l ytic capacity 47 µF OPC-966 (Cloning cable) Audio generator 300 Hz to 3 kHz AC millivoltmeter PTT PTT E MIC MICE SP– SP+ + – FM deviation meter SINAD meter Speaker (8 Ω ) Audio generator *OPC-966 (JIG CABLE) IC-F 5 0/F 5 1 (incl. level converter circuit) DB9 female plug to an RS-232C port RS-232C cabl[...]

  • Page 17

    5 - 4 5-2 SOFTW ARE ADJUSTMENTS (TRANSMITTING) Select an operation using [ ↑ ] / [ ↓ ] keys, then set specified value using [ ← ] / [ → ] keys on the connected computer keyboard. 1 2 3 4 1 1 2 3 1 2 3 1 2 3 • Operating CH : CH3 • Receiving • Operating CH : CH3 • T ransmitting • Operating CH : CH1 1 • Receiving • Operating CH :[...]

  • Page 18

    MAIN Front panel Minimum distortion level Set “ SQL level ” to close squelch. Then set “ SQL level ” at the point where the audio signals just appears. 5 - 5 *The output level of the standard signal generator (SSG) is indicated as the SSG ’ s open circuit. SOFTW ARE ADJUSTMENTS (RECEIVING) • Select an operation using [ ↑ ] / [ ↓ ] k[...]

  • Page 19

    [FRONT UNIT] [VR BOARD] R601 7210003130 V ARIABLE TP76N97N-13F-10KA-2497 T W601 8900012340 CABLE OPC-1260 T EP601 0910056532 PCB B 6034B D701 1790001810 S.V ARISTOR A VR-M1005C080MT ABB B D702 1790001810 S.V ARISTOR A VR-M1005C080MT ABB B D703 1790001810 S.V ARISTOR A VR-M1005C080MT ABB B D704 1790001810 S.V ARISTOR A VR-M1005C080MT ABB T D705 1790[...]

  • Page 20

    [FRONT UNIT] R494 7030008010 S.RESISTOR ERJ2GEJ 123 X (12 k Ω ) T R495 7030008010 S.RESISTOR ERJ2GEJ 123 X (12 k Ω ) T R496 7030005050 S.RESISTOR ERJ2GEJ 103 X (10 k Ω ) T R497 7030005050 S.RESISTOR ERJ2GEJ 103 X (10 k Ω ) T R500 7030005090 S.RESISTOR ERJ2GEJ 104 X (100 k Ω ) T R501 7030005090 S.RESISTOR ERJ2GEJ 104 X (100 k Ω ) T R502 [...]

  • Page 21

    [MAIN UNIT] Q23 1520000450 S.TRANSISTOR 2SB1 132 T100 Q B Q24 1590001 190 S.TRANSIST OR XP6501-(TX) .AB B Q25 1590000720 S.TRANSISTOR DT A144EUA T106 B Q26 1590003320 S.FET TPC6103 (TE85L) T Q27 1590000720 S.TRANSISTOR DT A144EUA T106 A only B Q29 1590000430 S.TRANSISTOR DTC144EUA T106 B D1 1790001670 S.DIODE RB706F-40T106 B D2 1750000580 S.DIODE 1[...]

  • Page 22

    [MAIN UNIT] R1 13 7030005040 S.RESISTOR ERJ2GEJ 472 X (4.7 k Ω ) T R1 15 7030007570 S.RESISTOR ERJ2GEJ 122X (1.2 k Ω ) B R1 16 7030007060 S.RESISTOR ERJ2GEJ 684X (680 k Ω ) B R1 17 7030005040 S.RESISTOR ERJ2GEJ 472 X (4.7 k Ω ) B R1 18 7030005040 S.RESISTOR ERJ2GEJ 472 X (4.7 k Ω ) B R1 19 7030005050 S.RESISTOR ERJ2GEJ 103 X (10 k Ω ) B[...]

  • Page 23

    [MAIN UNIT] C1 17 4030017730 S.CERAMIC ECJ0EB1E471K B C1 18 4030017530 S.CERAMIC ECJ0EC1H0R5B B C1 19 4030017460 S.CERAMIC ECJ0EB1E102K B C120 4030017730 S.CERAMIC ECJ0EB1E471K B C121 4030017390 S.CERAMIC ECJ0EC1H180J B C122 4030017660 S.CERAMIC ECJ0EC1H330J B C123 4030017510 S.CERAMIC ECJ0EC1H680J B C124 4030017440 S.CERAMIC ECJ0EC1H221J B C126 40[...]

  • Page 24

    SECTION 7 MECHANICAL P ARTS AND DISASSEMBL Y 7 - 1 REF. NO. ORDER NO. DESCRIPTION QTY. MP701 8950005520 2403 9-pin connector 1 REF. NO. ORDER NO. DESCRIPTION QTY. R601 7210003130 TP76N97N-13F-10KA-2497 1 REF. NO. ORDER NO. DESCRIPTION QTY. DS401 5030002630 L3-0048T A Y -2 1 EP402 8930061530 SRCN-2681-SP-N-W 2 SP401 2510001092 036D0801B 1 W401 89000[...]

  • Page 25

    7 - 2 UNIT abbreviation (C): CHASSIS P AR TS, (M): MAIN UNIT , (CO): CONNECTOR UNIT , (V): VR UNIT , (A): ACCESSORIES , (F): FR ONT UNIT MP15(C) MP11(C) MP415 ( F ) MP414 ( F ) MP413 ( F ) MP3 ( A ) MP2 ( A ) MP15 ( C ) MP404 ( F ) MP11 ( C ) MP411(F) MP412 ( F ) MP701 ( CO ) MP418 ( F ) MP417 ( F ) MP423 ( F ) MP426 ( F ) W401 ( F ) MP12 ( C ) MP1[...]

  • Page 26

    SECTION 8 SEMI-CONDUCT OR INFORMA TION 8 - 1 • DIODES • TRANSISTOR AND FET’S 2SA1577 Q (Symbol: HP) 2SC5107 O (Symbol: MFO) DT A144 EU (Symbol: 16) XP1214 (Symbol: 9H) RD01MUS1 (Symbol: K2) RD07MVS1 (Symbol: RD07MVS1) XP4111 (Symbol: 9U) XP4312 (Symbol: 7T) RSR025N03 (Symbol: QY) XP6501 AB (Symbol: 5N) 3SK299 (Symbol: U73) 2SC4215 O (Symbol: [...]

  • Page 27

    SECTION 9 BO ARD LA Y OUTS 9-1 MAIN UNIT • T OP VIEW R123 C256 C263 C281 C304 R194 C303 C271 R109 C208 C202 C206 R86 C145 C203 C143 R101 R100 C141 R89 C76 C83 C104 C111 R87 C139 EP1 R80 C257 C258 R127 R128 C247 C266 C251 R187 R23 C43 R21 R104 C170 R153 R154 R155 R152 C180 R148 C222 R182 C221 C223 R20 C37 C23 R174 R173 R16 C32 C28 R13 C27 R11 R5 R[...]

  • Page 28

    • BO TT OM VIEW C274 C248 C289 R144 R145 C158 C159 C287 R191 C157 EP6 C140 C209 R97 R93 EP3 C260 C269 C267 R130 R132 R116 R115 C162 C166 C164 C288 R190 R108 C156 R94 C155 C151 R164 C232 R98 R161 R169 C231 C97 R165 C292 C96 R62 C90 C95 R63 C99 R68 C15 C308 D2 L3 D1 C8 L16 Q23 C233 Q25 MP1 Q24 C238 C5 C2 C1 R51 L1 C11 C14 L7 L8 C35 L12 D14 D15 Q9 L[...]

  • Page 29

    9-2 FRONT UNIT • T OP VIEW C424 C494 C428 C483 C432 C491 C410 C408 R466 C442 R468 R467 R476 C477 C446 R420 R441 C445 R464 R465 R461 R462 R463 R475 R471 C461 R415 R472 R473 R474 R503 C473 R502 C468 C466 R414 C417 C495 C412 C493 C416 C413 R494 C418 R501 R412 C465 R413 R404 C403 R506 R512 R507 C478 C477 C425 R432 R430 R433 R401 C476 R402 C401 C475 C[...]

  • Page 30

    • BO TT OM VIEW R446 R458 R444 R442 C485 C500 R434 R445 C433 C484 R443 C426 R457 Q413 Q406 Q403 DS404 Q404 MC401 DS402 DS403 Q405 C437 DS406 DS405 9 - 4[...]

  • Page 31

    R601 VHF B6034B 9-3 VR BO ARD • T OP VIEW • BO TT OM VIEW 9 - 5[...]

  • Page 32

    9-4 CONNECT OR BO ARD • T OP VIEW D704 R701 MP701 9 1 PTT MIC TXD RXD RESET MICE OPTV VCC AFO • BO TT OM VIEW C704 D705 C703 C702 C701 D703 D702 D701 EP704 B6035C EP703 EP702 EP701 EP705 PTT MIC CLO CLI RES GND OPTV AFO VCC 9 - 6[...]

  • Page 33

    SECTION 10 BLOCK DIAGRAM 10 - 1 136–174MHz LPF TMUT BATTERY_1 BT1 1 F1 VCC 2 Q26: TCP6103 Q403: 2SC4116 Q404: RSR025N03 Q405: RSR025N03 W406: DTC144EU Q401: 2SB1132 Q402: XP6501 IC406: TC7W66FK D401: MA2S111 D402: MA2S111 Q407: DTA144EU Q409: XP4111 DS402_403 SML–310MT AMP IC407: NJM12904 LPF IC403: NJM12902 AF MUTE IC406: TC7W66FK SIGNAL AFO X[...]

  • Page 34

    SECTION 11 V OL T A GE DIA GRAM 11 - 1 11-1 MAIN UNIT C211 4.7 R104 220 k R105 330 k R94 150 k C151 0.1 C200 47 P C199 0.001 C201 1 C202 0.1 R116 680 k R115 1.2 k L35 0.22 H C185 0.1 C167 0.1 R40 1.5 k C67 0.001 C75 10 R38 100 k R36 1.5 k R48 680 R34 100 k C60 0.01 R35 100 C59 0.001 C57 0.001 C52 12 P C53 0.01 C54 0.001 L12 0.22 H R27 470 R26 470 C[...]

  • Page 35

    11-2 FRONT UNIT 11 - 2 COM2 COM1 SEG32 SEG31 SEG30 SEG29 SEG28 SEG27 SEG26 SEG25 SEG24 SEG23 SEG22 SEG21 SEG20 SEG19 SEG18 SEG17 PM7/SEG32 PN0/SEG33 PN1/SEG34 PN2/SEG35 PN3/SEG36 PN4/SEG37 PN5/SEG38 PN6/SEG39 PN7/SEG40 PH0/COM1 PH1/COM2 PH2/COM3 PH3/COM4 V1 V2 V3 C1 C2 PF3/ADTRG/IRQ3 P35/SCK1/SCL0/IRQ5 P34/RXD1/SDA0 P33/TXD1/SCL1 P32/SCK0/SDA1/IRQ4[...]

  • Page 36

    11-3 VR / CONNECTOR BO ARDS CONNECT OR BO ARD VR BO ARD R601 TP76N97N-13F-10KA-2497 W601 DUSE 4 3 2 1 AFOUT SIGNAL PWON From / to the J402 at the FRONT UNIT VCC VCC MICE R701 1 k C701 0.001 D701 AVR-M1005 C080MTABB D702 AVR-M1005 C080MTABB C704 0.001 D705 AVR-M1005 C080MTABB D703 AVR-M1005 C080MTABB D704 AVR-M1005 C080MTABB C702 0.001 C703 0.001 MI[...]

  • Page 37

    Asia Icom Inc. 6F No.68, Sec. 1 Cheng-T eh Road, T aipei, T aiwan, 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 T oulouse Cedex, France Phone : +33 (5) 61 36 03 03 Fax : +33 (5) 61 36 03 00 URL : http://www.ic[...]

  • Page 38

    1-1-32, Kamiminami, Hirano-ku, Osaka, 547-0003, J apan S-14007IZ-C1 © 2003 Icom Inc.[...]