Icom IC-F21 Series Service Manual
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Icom IC-F21 Series Service Manual

Uhf transceivers
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SERVICE
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UHF TRANSCEIVERS

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Summary of Contents for Icom IC-F21 Series

  • Page 1 SERVICE MANUAL UHF TRANSCEIVERS...
  • Page 2 INTRODUCTION This service manual describes the latest service information for the IC-F21/IC-F21S/IC-F21BR/IC-F21GM/IC-F22/IC- F22S/IC-F22SR at the time of publication. To upgrade quality, all electrical or mechanical parts and internal circuits are subject to change without notice or oblig- ation. DANGER NEVER connect the transceiver to an AC outlet or to a DC power supply that uses more than 8.6 V.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS SECTION SPECIFICATIONS SECTION INSIDE VIEWS SECTION DISASSEMBLY INSTRUCTIONS SECTION CIRCUIT DESCRIPTION RECEIVER CIRCUITS ........... . .4-1 TRANSMITTER CIRCUITS .
  • Page 4 SECTION 1 SPECIFICATIONS EIA-152-C/204D or TIA-603 ETS 300 086/300 296 440.000 MHz–470.000 MHz 440.000 MHz–470.000 MHz Frequency coverage 462.550 MHz–469.550 MHz 446.00625 MHz–446.09375 MHz 462.550 MHz–467.725 MHz Type of emission 16K0F3E/8K50F3E (at 25 / 12.5 kHz: W/N-type), 8K50F3E (at 12.5 kHz: N-type) Number of channels 2 ch.
  • Page 5 SECTION 2 INSIDE VIEWS • MAIN UNIT TOP VIEW BOTTOM VIEW Antenna switching circuit D1: 1SV307 D9, D10: MA77 RF amplifier (Q15: 3SK293) Power amplifier (Q1: 2SK2974) (IC2: TA75S01F) Pre-drive (Q2 : 2SK2973) AF amplifier (IC4: TA7368F) YGR amplifier Analog switch Q3: 2SC3585 R44 (IC6: BU4066BCFV) Q4: 2SC5107 O...

  • Page 6: Disassembly Instructions

    SECTION 3 DISASSEMBLY 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. ¢ Take off the chassis in the direction of the arrow. (Black, 2mm) x 2 ∞...

  • Page 7: Circuit Description

    SECTION 4 CIRCUIT DESCRIPTION 4-1 RECEIVER CIRCUITS The signals from the RF circuit are mixed at the 1st mixer (Q16) with a 1st LO signal (393.65–423.65 MHz) coming 4-1-1 ANTENNA SWITCHING CIRCUIT from the VCO circuit to produce a 46.35 MHz 1st IF signal. The antenna switching circuit functions as a low-pass filter while receiving.

  • Page 8: Transmitter Circuits

    The applied AF signals are amplified at the AF power ampli- 4-2-2 MODULATION CIRCUIT fier circuit (IC4, pin 4) to obtain the specified audio level. The The modulation circuit modulates the VCO oscillating signal amplified AF signals output from pin 10 as “AFOUT”signal (RF signal) using the microphone audio signal.

  • Page 9: Pll Circuits

    4-3 PLL CIRCUIT The pulse-type signal is converted into DC voltage (lock voltage) at the loop filter (R40–R42, C74–C77), and then 4-3-1 GENERAL applied to varactor diodes (D5) of the RX-VCO to stabilize A PLL circuit provides stable oscillation of the transmit fre- the oscillated frequency.

  • Page 10: Power Supply Circuits

    4-5 PORT ALLOCATIONS 4-4 POWER SUPPLY CIRCUITS 4-5-1 CPU (IC7) VOLTAGE LINE Port Description LINE DESCRIPTION number name The voltage from the attached battery pack. Input port for RESET signal. The same voltage as the HV line (battery volt- SENC0 age) which is controlled by the power swtich SENC1 Outputs single tone encode signal.
  • Page 11 CPU (IC7)–continued Port Description number name Input port for the battery’s type detec- BDET tion. BATV Input port for battely voltage detection. 4-5-2 OUTPUT EXPANDER IC (IC15) Port Description number name Outputs clock shift control signal for CSFT CPU. RMUT Outputs RX mute control signal.

  • Page 12: Adjustment Procedures

    SECTION 5 ADJUSTMENT PROCEDURES 5-1 PREPARATION When you adjust the contents on page 5-5 or 5-6, SOFTWARE ADJUSTMENT, the optional CS-F21 ADJ ADJUSTMENT SOFTWARE (Rev. 1.0 or later), OPC-478 and a JIG CABLE (see illustration at page 5-2) are required. CLONING CABLE REQUIRED TEST EQUIPMENT EQUIPMENT...
  • Page 13 SCREEN DISPLAY EXAMPLE CS-F21 ADJ Rev.1.0 File Option COM 1: OPEN Connect Reload (F5) Disp para [A / D] [D / A] : 197 : C5h : 7.73 V BPF T1 : 90 : 5Ah : 1.76 V TEMPS : 190 : BEh : 32.23 ’C BPF T2 : 45 : 2Dh : 0.88 V...
  • Page 14 CONNECTION Standard signal generator to the antenna connector to [MIC] 0.1 V to 32 mV Audio generator ( 127 dBm to 17 dBm) CAUTION: DO NOT transmit while an SSG is connected to to an RS-232C port the antenna connector. Personal computer OPC-478...

  • Page 15: Pll Adjustment

    5-2 PLL ADJUSTMENT MEASUREMENT ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITIONS VALUE UNIT LOCATION UNIT ADJUST PLL LOCK • Operating frequency MAIN Connect a digital multi 1.3 V – MAIN VOLTAGE 440.000 MHz meter to check point 1.8 V 462.550 MHz 446.00625 MHz •...

  • Page 16: Software Adjustment

    5-3 SOFTWARE ADJUSTMENT Select an operation using [↑] / [↓] keys, then set specified value using [←] / [→] keys on the connected computer keyboard. MEASUREMENT ADJUSTMENT ADJUSTMENT CONDITION VALUE UNIT LOCATION REFERENCE • Operating frequency: Loosely couple a frequnecy 470.0000 MHz FREQUENCY 470.000 MHz...
  • Page 17 SOFTWARE ADJUSTMENT – continued Select an operation using [↑] / [↓] keys, then set specified value using [←] / [→] keys on the connected computer keyboard. MEASUREMENT ADJUSTMENT ADJUSTMENT CONDITION VALUE UNIT LOCATION 1 • Operating frequency: Connect a SINAD meter with an Minimum distortion 8 Ω...
  • Page 18 SECTION 6 PARTS LIST [SW-A UNIT] ([F21], [F21GM], [F22] AND [F22SR]) [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 1590003020 S.TRANSISTOR XP4216-(TX) IC16 1110005330 S.IC NJM12904V-TE1 7210003060 VARIABLE TP76N00N-15F-10KA-2251 1560001050 S.FET 2SK2974 ERJ3GEYJ 331 V (330 Ω) 7030003380 S.RESISTOR 1560001020 S.FET 2SK2973 (MTS101P) ERJ3GEYJ 561 V (560 Ω) 7030003410 S.RESISTOR 1530002620 S.TRANSISTOR 2SC3585 R44-T2B...
  • Page 19 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 6200005680 S.COIL ELJRE 15NG-F 7030003660 S.RESISTOR ERJ3GEYJ 683 V (68 kΩ) 6200005710 S.COIL ELJRE 27NG-F 7030003700 S.RESISTOR ERJ3GEYJ 154 V (150 kΩ) 6200005710 S.COIL ELJRE 27NG-F 7030003690 S.RESISTOR ERJ3GEYJ 124 V (120 kΩ) ERJ3GEYJ 101 V (100 Ω) 6200009360 S.COIL 0.45-1.4-3TL 11N...
  • Page 20 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION R142 7030003680 S.RESISTOR ERJ3GEYJ 104 V (100 kΩ) R228 7030003760 S.RESISTOR ERJ3GEYJ 474 V (470 kΩ) ERJ3GEYJ 104 V (100 kΩ) D only R229 7030003470 S.RESISTOR ERJ3GEYJ 182 V (1.8 kΩ) R143 7030003680 S.RESISTOR ERJ3GEYJ 104 V (100 kΩ) C only R232...
  • Page 21 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 4030007010 S.CERAMIC C1608 CH 1H 100D-T-A C152 4030007010 S.CERAMIC C1608 CH 1H 100D-T-A 4030009920 S.CERAMIC C1608 CH 1H 050B-T-A C153 4030006900 S.CERAMIC C1608 JB 1H 103K-T-A 4030009540 S.CERAMIC C1608 CH 1H 1R5B-T-A C154 4030007170 S.CERAMIC C1608 CH 1H 221J-T-A...
  • Page 22 [MAIN UNIT] ORDER DESCRIPTION C236 4030008880 S.CERAMIC C1608 JB 1H 223K-T-A C237 4030006860 S.CERAMIC C1608 JB 1H 102K-T-A C238 4030006860 S.CERAMIC C1608 JB 1H 102K-T-A C239 4030006860 S.CERAMIC C1608 JB 1H 102K-T-A C240 4030007090 S.CERAMIC C1608 CH 1H 470J-T-A C242 4030008470 S.CERAMIC C1608 JB 1H 272K-T-A C243...

  • Page 23: Mechanical Parts And Disassembly

    SECTION 7 MECHANICAL PARTS AND DISASSEMBLY [CHASSIS PARTS] [MAIN UNIT] REF. NO. ODER NO. DESCRIPTION QTY. REF. NO. ODER NO. DESCRIPTION QTY. 2510001100 Speaker 036D0601 8510013000 2336 VCO case 8510011180 1923 VCO cover 8210017710 2458 front panel 8510014320 2458 main shield 8930054680 2458 release button 8930055690 Sponge (GT) 8930054690 2458 lens...
  • Page 24 MP21 (C) MP32 (C) MP27 (C) MP8 (C) MP14 (C) MP13 (C) MP29 (C) MP39 (C) MP29 (C) MP12 (C) MP9 (C) MP35 (C) ([F21S], [F21BR] and [F22S] only) MP18 (C) MP19 (C) ([F21], [F21GM], [F22] and [F22SR] only) MP6 (M) MP29 (C) MP26 (C) MP7(M)

  • Page 25: Semi-Conductor Information

    SECTION 8 SEMI-CONDUCTOR INFORMATION • TRANSISTOR AND FET’S 2SA1577 Q 2SB1132 R 2SC3585 R44 2SC4116 GR 2SC4215 O (Symbol: HQ) (Symbol: BARB) (Symbol: R44) (Symbol: LG) (Symbol: QO) 2SC5085 Y 2SC5107 O 2SK880 Y 2SK2973 2SK1829 (Symbol: MCY) (Symbol: MFO) (Symbol: XY) (Symbol: K1) (Symbol: K1)

  • Page 26: Board Layouts

    SECTION 9 BOARD LAYOUTS 9-1 IC-F22/F22S/F22SR MAIN UNIT • TOP VIEW R222 R223 C196 R192 R136 R129 C244 R188 R159 R190 C229 to the SW-A/B units R187 R138 C194 C177 C185 R196 C231 7 GND R112 R123 R121 R120 C175 C228 R198 TLED...
  • Page 27 • BOTTOM VIEW C178 R165 C203 R179 C195 C176 R119 C218 R180 R178 R158 R200 C186 R118 R127 C227 R177 R140 R133 R181 R176 C187 C219 R130 R182 R233 R184 R141 R234 R185 C189 C161 R199 C162 R101 C155 R227 C257 R125 R100...

  • Page 28: Ic-F21/F21S/F21Br/F21Gm Main Unit

    9-2 IC-F21/F21S/F21BR/F21GM MAIN UNIT • TOP VIEW R222 R223 C196 R192 R136 R129 C244 R188 R159 R190 C229 R138 to the SW-A/B units R187 C194 C177 C185 R196 C231 7 GND R112 R123 R121 R120 C175 C228 R198 IC16 TLED R195 R116 RLED...
  • Page 29 • BOTTOM VIEW C178 R165 C203 R179 C195 C176 R119 C218 R180 R178 R158 R200 C186 R127 R118 C227 R177 R140 R133 R181 R176 C187 C219 R130 R182 R233 R184 R141 R234 R185 C189 C161 R199 C162 R101 C155 R227 C257 R125 C202...

  • Page 30: Sw-A And Sw-B Units

    9-3 SW-A AND SW-B UNITS • TOP VIEW SW-A UNIT SW-B UNIT 9 - 5...
  • Page 31 • BOTTOM VIEW SW-A UNIT to the MAIN unit J1 to the MAIN unit J2 SW-B UNIT B5604C to the MAIN unit J2 9 - 6...

  • Page 32: Parts List

    SECTION 10 BC-146 OPTIONAL DESKTOP CHARGER INFORMATION 10-1 PARTS LIST 10-2 DISASSEMBLY INFORMATION [CHARGE UNIT] REF. NO. ODER NO. DESCRIPTION QTY. 7010007550 RESISTOR ERG3SJ680H 7010007100 RESISTOR PSD1/4V 1 kΩ 6510021470 CONNECTOR HEC0470-01-230 5040001390 LED TLG124A 0910053820 PCB B 5650 8930051340 2338 TERMINAL 8930051340 2338 TERMINAL [CHASSIS UNIT] REF.

  • Page 33: Voltage Diagram

    10-3 VOLTAGE DIAGRAM C : 13.8V C : 7.2V N : 13.8V N : 13.8V R1 68 TLG124A HEC0470-01-230 C : 9.2V N : 13.8V 10-4 BOARD LAYOUT B5650 10 - 2...

  • Page 34: Main Unit

    SECTION 11 BLOCK DIAGRAM Q8 DTC144EUA XP6501 Q9 XP1214 MAIN UNIT RIPPLE 2SK880 440–470MHz Q10 2SC5085 LVIN BUFF D5 HVU350B CR-671A D3,D4 D1 1SV307 MA77 MB15A02PFV1 2SK2974 RB706F-40 D9,D10 MA77 2SC5107 2SC3585 2SK2973 RX VCO 2SC5107 2SC5107 15.3MHz TX / RX LOOP BUFF BUFF...
  • Page 35 SECTION 12 VOLTAGE DIAGRAM NOTE: A: [F21], [F21BR], [F21GM] and [F21S] B: [F22], [F22S] and [F22SR] C: [F21BR], [F21GM] and [F22SR] D: [F21], [F21S], [F22] and [F22S] E: [F21BR], [F21S] and [F22S] F: [F21GM], [F21], [F22] and [F22SR] VCO5V Q12 XP6501 AB 3.3 k 2.7 k 4.9 V...
  • Page 36 F21GM] and [F22SR] F21], [F22] and [F22SR] VCO5V 0.001 2SC5085 Y 14 nH 14 nH VCO5V C260 0.001 47 P 4.1 V 3225 H VCO5V 47 P 0.001 0.5 P J7 [F22SR] only 0.001 0.82 H B only 10 k 47 P 4.7 V 3.7 V...
  • Page 37 SECTION 12 VOLTAGE DIAGRAM NOTE: A: [F21], [F21BR], [F21GM] and [F21S] B: [F22], [F22S] and [F22SR] C: [F21BR], [F21GM] and [F22SR] D: [F21], [F21S], [F22] and [F22S] E: [F21BR], [F21S] and [F22S] F: [F21GM], [F21], [F22] and [F22SR] VCO5V Q12 XP6501 AB 3.3 k 2.7 k 4.9 V...

  • Page 38: Sw-A And Sw-B Units

    12-2 SW-A AND SW-B UNITS • SW-A UNIT CP10 CBI0 CP11 CBI1 CP12 CBI2 CP13 CBI3 CBI0 TP76N00N-15F-10KA-2251 VOLOUT VOLIN RX (SQL OPEN) 4.8 V RLED 4.8 V RX (SQL OPEN) 0 V TLED Q1 XP4216 RX (SQL OPEN) 0 V 4.1 V RX (SQL OPEN) 2.1 V LNJ107W5PRW...
  • Page 40 S-13806IZ-C1U 1-1-32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan © 2001 Icom Inc.

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