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Icom IC-F21S manual

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Table of contents for the manual

  • Page 1

    SER VICE MANUAL 1-1-32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan S-13717IZ-C1 © 2001 Icom Inc. UHF FM TRANSCEIVERS[...]

  • Page 2

    INTRODUCTION DANGER ORDERING P ARTS REP AIR NOTES This service manual describes the latest service information for the IC-F21/IC-F21S at the time of publication. NEVER connect the transceiver to an AC outlet or to a DC power supply that uses more than 16 V . Such a connection could cause a fire hazard and/or electric shock. DO NOT expose the transc[...]

  • Page 3

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

  • Page 4

    1 - 1 SECTION 1 SPECIFICA TIONS ‘ ‘ GENERAL • Frequency coverage : 440.000–470.000 MHz • T ype of emission : 16K0F3E (at 25 kHz), 8K50F3E (at 12.5 kHz) • Number of channels : 2 ch (IC-F21S), 16 ch (IC-F21) • Power supply requirement : 7.2 V DC (negative ground) • Current drain (approx.) : T ransmit at High (4.0 W) 1.6 A at Low2 (2.0[...]

  • Page 5

    2 - 1 SECTION 2 INSIDE VIEWS • MAIN UNIT Power amplifier (Q1: 2SK2974) Antenna switching circuit D1: 1SV307 D9, D10: MA77 T OP VIEW BO TTOM VIEW RF amplifier (Q15: 3SK293) VCO circuit FM IF IC (IC3: T A31 136FN) Low-pass filter circuit (IC12,16: NJM12904V) Expander IC (IC15: BU4094BCFV) TX/RX switch (D3, D4: MA77) Analog switch (IC6: BU4066BCFV) [...]

  • Page 6

    3 - 1 SECTION 3 DISASSEMBL Y INSTRUCTIONS • REMOVING THE CHASSIS ¡ Unscrew 1 nut, A , and remove 2 knobs, B , C . ™ Unscrew 2 screws, D . £ Unscrew 2 screws, H , to separate the Jack panel and the Front panel. ¢ T ake off the chassis in the direction of the arrow . ∞ Unplug J6 to separate the front panel and the chassis. • REMOVING THE M[...]

  • Page 7

    4 - 1 SECTION 4 CIRCUIT DESCRIPTION 4-1 RECEIVER CIRCUITS 4-1-1 ANTENNA SWITCHING CIRCUIT The antenna switching circuit functions as a low-pass filter while receiving. However , its impedance becomes very high while D9 and D10 are turned ON. Thus transmit signals are blocked from entering the receiver circuits. The antenna switching circuit employs[...]

  • Page 8

    4 - 2 The applied AF signals are amplified at the AF power ampli- fier circuit (IC4, pin 4) to obtain the specified audio level. The amplified AF signals output from pin 10 as “AFOUT”signal are applied to the internal speaker (SP1) as the “SP” signal via the [SP] jack when no plug is connected to the jack. 4-1-6 SQUELCH CIRCUIT A squelch ci[...]

  • Page 9

    4 - 3 4-3 PLL CIRCUIT 4-3-1 GENERAL A PLL circuit provides stable oscillation of the transmit fre- quency and receive 1st LO frequency . The PLL output com- pares the phase of the divided VCO frequency to the refer- ence frequency . The PLL output frequency is controlled by a crystal oscillator and the divided ratio (N-data) of a pro- grammable div[...]

  • Page 10

    4 - 4 4-4 POWER SUPPL Y CIRCUITS VOL T AGE LINE LINE HV VCC CPU5V T5V R5V S5V +5V VCO5V DESCRIPTION The voltage from the attached battery pack. The same voltage as the HV line (battery volt- age) which is controlled by the power swtich ([VOL] control). Common 5 V converted from the VCC line by the +5 regulator circuit (IC10). The output voltage is [...]

  • Page 11

    4 - 5 Pin number 61 62 Port name BDET BA TV Description Input port for the battery’s type detec- tion. Input port for battely voltage detection. 4-5-3 D/A CONVERTOR IC (IC9) Pin number 2, 3, 10, 1 1 14 15 22 Port name T1–T4 REF BAL DEV Description Output tunable bandpass filters con- trol signals. Outputs differential voltage for the ref- erenc[...]

  • Page 12

    5-1 PREP ARA TION When you adjust the contents on page 5-5 or 5-6, SOFTW ARE ADJUSTMENT , the optional CS-F21 ADJ ADJUSTMENT SOFTWARE (Rev . 1.0 or later), OPC-478 CLONING CABLE and a JIG CABLE (see illustration at page 5-2) are required. ■ REQUIRED TEST EQUIPMENT 5 - 1 SECTION 5 ADJUSTMENT PROCEDURES EQUIPMENT DC power supply RF power meter (ter[...]

  • Page 13

    5 - 2 JIG cable + ( CLONE) ( GND) + ( SP) ( SPE) 3-conductor 3.5(d) mm plug OPC-478 JIG cable to IC-F4GT/GS [SP] jack CS-F21 ADJ Rev .1.0 File COM 1: OPEN Option Connect Reload (F5) Disp para [A / D] VIN : 197 : C5h : 7.73 V TEMPS : 190 : BEh : 32.23 ’ C L VIN : 98 : 62h : 1.92 V SD : 0 : 00h : 0.00 V REMOT : 14 : 0Eh : 0.27 V BDET : 255 : FFh : [...]

  • Page 14

    5 - 3 to an RS-232C port Personal computer to [MIC] to [SP] JIG cable DB9 female plug (incl. level converter circuit) Connection to the antenna connector RF power meter 0.1—10 W/50 ‰ Frequency counter Attenuator 40 dB or 50 dB FM deviation meter Standard signal generator 0.1 V to 32 mV (—127 dBm to —17 dBm) SINAD meter Speaker (8 ‰) Audio[...]

  • Page 15

    5 - 4 C54 PLL lock voltage adjustment (RX) TOP VIEW RF power meter C68 PLL lock voltage adjustment (TX) LV PLL lock voltage check point 5-2 PLL ADJUSTMENT PLL LOCK VOL T AGE 1 2 3 4 • Operating frequency: 440.000 MHz • Receiving • T ransmitting • Operating frequency: 470.000 MHz • Receiving • T ransmitting MAIN Connect a digital multi m[...]

  • Page 16

    5 - 5 1 1 2 3 1 2 1 • Operating frequency: 470.000 MHz • High/Low switch : Low • Connect the RF power meter or 50 Ω dummy load to the antenna connector . • T ransmitting • Operating frequency: 440.000 MHz • High/Low switch : High • T ransmitting • High/Low switch : Low2 • T ransmitting • High/Low switch : Low1 • T ransmittin[...]

  • Page 17

    5 - 6 Minimum distortion level 12 dB SINAD At the point where the audio signals just appears. 1 • Operating frequency: 440.000 MHz • Channel spacing :Narrow • Connect a standard signal generator to the antenna connector and set as: Frequency : 440.000 MHz Level : 10 µ V* ( – 87 dBm) Modulation : OFF Deviation : ± 1.75 kHz • Receiving ?[...]

  • Page 18

    6 - 1 S.=Surface mount Q1 1590003020 S.TRANSISTOR XP4216-(TX) R1 7210003060 V ARIABLE TP76N00N-15F-10KA-2251 R2 7030003380 S.RESISTOR ERJ3GEYJ 331 V (330 Ω ) R3 7030003410 S.RESISTOR ERJ3GEYJ 561 V (560 Ω ) F1 5210000710 S.FUSE KAB 2402 322 NA29 DS1 5040002070 S.LED LNJ107W5PRW S1 2250000430 ENCODER TP70QF4161-16F-2458 EP1 0910053673 PCB B 5603[...]

  • Page 19

    6 - 2 S.=Surface mount L13 6200009360 S.COIL 0.45-1.4-3TL 1 1N L14 6200002860 S.COIL NL 252018T -4R7J L15 6200002800 S.COIL ELJFC R68M-F L16 6200009360 S.COIL 0.45-1.4-3TL 1 1N L17 6200002860 S.COIL NL 252018T -4R7J L18 6200005680 S.COIL ELJRE 15NG-F L19 6200008240 S.COIL 0.30-0.9-5TL 14N L20 6200008240 S.COIL 0.30-0.9-5TL 14N L21 6200007670 S.COIL[...]

  • Page 20

    6 - 3 S.=Surface mount R152 7030003940 S.RESISTOR ERJ3GEYF 104 V (100 k Ω ) R153 7030003940 S.RESISTOR ERJ3GEYF 104 V (100 k Ω ) R154 7030003940 S.RESISTOR ERJ3GEYF 104 V (100 k Ω ) R155 7030003200 S.RESISTOR ERJ3GEYJ 100 V (10 Ω ) R156 7030003800 S.RESISTOR ERJ3GEYJ 105 V (1 M Ω ) R157 7030003570 S.RESISTOR ERJ3GEYJ 123 V (12 k Ω ) R15[...]

  • Page 21

    6 - 4 S.=Surface mount C86 4030006860 S.CERAMIC C1608 JB 1H 102K-T -A C87 4030007090 S.CERAMIC C1608 CH 1H 470J-T -A C88 403001 1600 S.CERAMIC C1608 JB 1C 104KT -N C89 4030006860 S.CERAMIC C1608 JB 1H 102K-T -A C90 403001 1770 S.CERAMIC C1608 CH 1H 060B-T -A C91 403001 1770 S.CERAMIC C1608 CH 1H 060B-T -A C92 4030008630 S.CERAMIC C1608 JF 1C 104Z-T[...]

  • Page 22

    [MAIN UNIT] S.=Surface mount C261 4030007090 S.CERAMIC C1608 CH 1H 470J-T -A J1 6910013720 CONNECTOR IMSA-9230B-04Z120-T [F21] only J2 6910013730 CONNECTOR IMSA-9230B-07Z120-T J3 6510021900 S.CONNECTOR BM02B-ASRS-TF J4 6450001680 CONNECTOR HSJ1 122-010010 J5 6450001690 CONNECTOR HSJ1456-01-220 MC1 7700002160 MICROPHON KUC3523-040245 S1 2230001060 S[...]

  • Page 23

    SECTION 7 MECHANICAL P ARTS AND DISASSEMBL Y 7 - 1 RE F . NO . ODER NO . DESCRIPTION QTY . SP1 2510001 100 Speaker 036D0601 1 MP1 8210017710 2458 front panel 1 MP4 8930054680 2458 release button 1 MP6 8930054690 2458 lens 1 MP7 8210017730 2458 jack panel 1 MP8 8930054881 2458 plus terminal-1 1 MP9 8010018501 2458 chassis-1 1 MP10 8930054710 2458 A-[...]

  • Page 24

    7 - 2 UNIT abbreviation (C): CHASSIS P ARTS, (M): MAIN UNIT MAIN unit MP29 (C) MP28 (C) MP15 (C) MP10 (C) MP21 (C) MP32 (C) MP8 (C) MP29 (C) MP29 (C) MP12 (C) MP9 (C) MP22 (C) IC-F21S MP34 (C) MP27 (C) MP14 (C) MP13 (C) MP39 (C) MP29 (C) MP35 (C)([F21S] only) MP7(M) MP29 (C) MP7 (C) MP20 (C) MP11 (C) MP30 (C) MP29 (C) MP29 (C) MP2 (M) MP1 (M) MP1 ([...]

  • Page 25

    SECTION 8 SEMI-CONDUCT OR INFORMA TION 8 - 1 2SC5085 Y (Symbol: MCY) 2SK1829 (Symbol: K1) 2SC5107 O (Symbol: MFO) 2SK880 Y (Symbol: XY) 2SK2974 (Symbol: K2974) 2SC4116 GR (Symbol: LG) 2SA1577 Q (Symbol: HQ) 2SB1132 R (Symbol: BARB) 3SK272 (Symbol: K) 2SC4215 O (Symbol: QO) 2SK2973 (Symbol: K1) DTC144 TU (Symbol: 06) DTC144 EU (Symbol: 26) UN911 H ([...]

  • Page 26

    SECTION 9 BOARD LA YOUTS 9 - 1 9-1 MAIN UNIT • TOP VIEW C196 C194 R159 R222 R223 R224 R122 R151 C223 R143 EP7 R145 R146 R187 R195 R188 R193 R190 C226 C242 C243 R215 R224 R225 R226 C245 C246 R155 C191 C258 C225 C224 R191 R189 R194 R245 C58 R163 C43 L11 X3 R50 R22 R31 R23 R24 R51 R164 C84 C85 C252 D6 R32 C67 C63 C65 C253 C206 D19 C86 C87 C88 C192 C[...]

  • Page 27

    9 - 2 • BOTTOM VIEW R133 R130 R227 R229 R63 D12 C100 C99 D9 L19 D1 C106 D10 MP5 C98 R60 R61 R59 C96 C7 L4 C165 R103 C118 R73 L1 C257 C114 C115 R71 R125 C119 R75 C121 R127 R118 IC2 Q21 IC9 Q16 R84 R86 R83 C129 C138 C123 R76 L26 C127 C128 C137 R89 C136 C126 C202 R93 R119 C178 C176 R165 R100 C203 C186 R140 C187 R141 C189 R99 C154 C155 R98 C147 R90 C[...]

  • Page 28

    9 - 3 9-2 SW-A AND SW-B UNITS • TOP VIEW SW-A UNIT F1 Q1 DS1 B5603C SW-B UNIT F1 Q1 DS1[...]

  • Page 29

    9 - 4 • BOTTOM VIEW SW-A UNIT SW-B UNIT R2 R3 R1 S1 J2 to the MAIN unit J2 17 CBI0 VOLOUT VOLIN VCC RLED TLED GND J1 to the MAIN unit J1 14 CBI0 CBI1 CBI2 CBI3 S1 W1 R2 R3 W2 R1 B5604C J2 to the MAIN unit J2 17 CBI0 VOLOUT VOLIN VCC RLED TLED GND[...]

  • Page 30

    10 - 1 SECTION 10 BC-146 OPTIONAL DESKTOP CHARGER INFORMA TION RE F . NO . ODER NO . DESCRIPTION QTY . MP1 8010018620 2447 case (A) 1 MP2 81 10007450 2447 cover 1 MP3 8930039620 Leg cushion (A) 4 MP4 8930055020 2480 spacer 1 MP5 8930055030 2480 BC-spacer 1 MP6 8810008660 Screw B0 M 3 x 8 NI-ZU (BT) 1 [CHASSIS UNIT] 10-1 P ARTS LIST 10-2 DISASSEMBL [...]

  • Page 31

    10 - 2 10-3 VOL T AGE DIAGRAM 10-4 BOARD LA YOUT MP1 R1 68 J1 HEC0470-01-230 R2 1k DS1 TLG124A MP2 C : 13.8V N : 13.8V C : 7.2V N : 13.8V C : 9.2V N : 13.8V J1 MP1 MP2 B5650 R1 R2 HD1 DS1[...]

  • Page 32

    11 - 1 SECTION 1 1 BLOCK DIAGRAM ANT 440–470MHz Q1 2SK2974 D1 1SV307 D9,D10 MA77 D2 RB706F-40 Q2 2SK2973 Q3 2SC3585 Q4 2SC5107 VCO SW D3,D4 MA77 Q7 2SC5107 Q5 2SC5107 Q8 DTC144EU Q9 XP1214 R5V S5V RX VCO Q12 XP6501 Q10 2SC5085 D5 HVU350 Q11 2SC5085 D7 HVU350 LVIN BUFF Q13 2SK880 IC1 MB15A02PFV1 X1 CR-671A REF BAL DEV 15.3MHz Q18 2SC4116 REF Q31 2[...]

  • Page 33

    R47 47 EP3 VCC CBI0 CBI1 CBI2 CBI3 RLED TLED CBI0 C156 0.001 C157 0.001 C158 0.001 C159 0.001 W12 W13 EP7 VOLIN VOLOUT C93 47 P C94 47 P F1 F2 C84 0.001 R51 47 k D19 HVC362 C85 2.2 R50 56 REF BAL R52 1k C92 0.1 D20 MA2S111 R232 150 k OSCIN OSCOUT VP VCC DO GND LD FIN CLOCK 9 DATA 10 LE 11 FC 12 NC 13 FOUT 14 P 15 R 16 8 7 6 5 4 3 2 1 R244 22 SCK UN[...]

  • Page 34

    EP3 C3 7 P C5 4 P C6 0.001 R1 82 k D1 1SV307 L1 14 nH L2 14 nH C8 47P C9 0.001 C18 47 P C20 0.001 R2 100 L3 0.82 H T5V C34 47 P C35 47 P R11 10 R13 220 L6 EXCCL3225U W14 C45 47 P R16 10 k R19 100 R22 220 R24 100 C260 0.001 T5V VCO5V VCO5V C48 0.001 R5V S5V RSSI R5V VCO5V S5V RSSI RSSI C60 0.001 C61 47 P C62 0.5 P R27 10 k 3 2 1 5 4 R33 220 C37 0.00[...]

  • Page 35

    R47 47 EP3 VCC CBI0 CBI1 CBI2 CBI3 RLED TLED CBI0 C156 0.001 C157 0.001 C158 0.001 C159 0.001 W12 W13 EP7 VOLIN VOLOUT C93 47 P C94 47 P F1 F2 C84 0.001 R51 47 k D19 HVC362 C85 2.2 R50 56 REF BAL R52 1k C92 0.1 D20 MA2S111 R232 150 k OSCIN OSCOUT VP VCC DO GND LD FIN CLOCK 9 DATA 10 LE 11 FC 12 NC 13 FOUT 14 P 15 R 16 8 7 6 5 4 3 2 1 R244 22 SCK UN[...]

  • Page 36

    12 - 2 12-2 SW-A AND SW-B UNITS • SW-A UNIT TP76N00N-15F-10KA-2251 R1 Q1 XP4216 R3 560 R2 330 DS1 LNJ107W5PRW C 1 1 2 2 3 4 4 8 5 S1 CP10 CP11 CP12 CBI0 CBI1 CP13 CBI2 CBI3 CP8 HV F1 6 5 4 3 2 1 CP3 CP4 CP5 CP6 CP2 CP9 CBI0 VOLIN VOLOUT VCC RLED TLED GND CP1 G R RX (SQL OPEN) 4.1 V RX (SQL OPEN) 0 V RX (SQL OPEN) 2.1 V RX (SQL OPEN) 4.8 V TX 4.8 [...]

  • Page 37

    INTRODUCTION DANGER ORDERING P ARTS REP AIR NOTES This service manual describes the latest service information for the IC-F21/IC-F21S at the time of publication. NEVER connect the transceiver to an AC outlet or to a DC power supply that uses more than 16 V . Such a connection could cause a fire hazard and/or electric shock. DO NOT expose the transc[...]

  • Page 38

    SER VICE MANUAL 1-1-32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan S-13717IZ-C1 © 2001 Icom Inc. VHF FM TRANSCEIVERS[...]