Icom IC-F620 Service Manual
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Icom IC-F620 Service Manual

Uhf transceiver
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Summary of Contents for Icom IC-F620

  • Page 1 SERVICE MANUAL UHF TRANSCEIVER iF610 iF620 iF621...
  • Page 2 IC-F610 MAIN UNIT 5 pieces 6. DO NOT transmit power into a signal generator or a 8810009990 Screw PH BT M3×8 ZK IC-F620 Bottom cover 10 pieces sweep generator. 7. ALWAYS connect a 50 dB to 60 dB attenuator between...

  • Page 3: Table Of Contents

    EXPLICIT DEFINITIONS FREQUENCY COVERAGE CHANNEL SPACING L-band 400 – 430 MHz Narrow/Wide-type 12.5 kHz / 25 kHz M-band 440 – 490 MHz Narrow/Middle-type 12.5 kHz / 20 kHz H1-band 480 – 512 MHz H-band H2-band 480 – 520 MHz TABLE OF CONTENTS SECTION 1 SPECIFICATIONS SECTION 2...
  • Page 4 SECTION 1 SPECIFICATIONS USA/GEN Measurement method EIA-152-C/204D or TIA-603 ETS 300 086 [L-band]: 400.000–430.000 MHz Frequency coverage [M-band]: 440.000–490.000 MHz [H-band]: 480.000–512.000 MHz [USA], 480.000–520.000 MHz [EUR]/[GEN] [N/W]: 8K50F3E/16K0F3E (12.5 kHz; Narrow/25 kHz; Wide), Type of emission [N/M]: 8K50F3E/14K0F3E (12.5 kHz; Narrow/20 kHz; Middle) ×...
  • Page 5 SECTION 2 INSIDE VIEW Power module IC3: RA30H4047M [L] Antenna switch/ RA30H4452M [M]-25W, [H] Low-pass filter circuits RA45H4452M [M]-45W 8V regurator (IC9: TA7808F) AF amplifier 1st mixer* (IC8: LA4425A) (Q3: 3SK272) CPU 5V regurator* 2nd IF filter (IC10: AN78L05M) (FI2: ALFYM450F=K) FM IF IC VCO circuit (IC1: TA31136FN)
  • Page 6 SECTION 3 DISASSEMBLY INSTRUCTIONS • Opening case ➀ ➈ Unscrew 4 screws A, and remove the bottom cover. Lift up the front portion of the main unit and remove it. ➁ Disconnect the flat cable B from J2. ➂ Unscrew 2 screws c, and remove the front unit. •...

  • Page 7: Circuit Description

    SECTION 4 CIRCUIT DESCRIPTION 4-1 RECEIVER CIRCUITS 4-1-3 1ST MIXER AND 1ST IF CIRCUITS (MAIN unit) 4-1-1 ANTENNA SWITCHING CIRCUIT (MAIN unit) The 1st mixer circuit converts the received signals to a fixed The antenna switching circuit functions as a low-pass filter frequency of the 1st IF signal with the PLL output frequency.

  • Page 8: Transmitter Circuits

    4-1-5 AF AMPLIFIER CIRCUIT (MAIN unit) 4-2 TRANSMITTER CIRCUIT The AF amplifier circuit amplifies the demodulated AF sig- 4-2-1 MICROPHONE AMPLIFIER CIRCUIT nals to drive a speaker. (MAIN unit) The microphone amplifier circuit amplifies audio signals The AF signals from the FM IF IC (IC1, pin 9) are amplified within +6 dB/octave pre-emphasis characteristics from the at the AF amplifier section of the compander IC (IC14, pins microphone to a level needed for the modulation circuit.

  • Page 9: Pll Circuits

    4-2-4 POWER AMPLIFIER CIRCUIT (MAIN unit) 4-3 PLL CIRCUITS The power amplifier circuit amplifies the driver signal to an 4-3-1 PLL CIRCUIT output power level. A PLL circuit provides stable oscillation of the transmit fre- quency and receive 1st LO frequency. The PLL output com- The RF signal from the pre-drive amplifier (Q8) is applied to pares the phase of the divided VCO frequency to the refer- the power module (IC3) to obtain 25 W for IC-F610/F620, or...

  • Page 10: Power Supply Circuits

    4-4 POWER SUPPLY CIRCUITS 4-4-1 VOLTAGE LINES (MAIN unit) 4-5-3 CPU (MAIN unit; IC20) Description Line Port Description number name The voltage from a DC power supply. I/O port for data signals from/to the D/A DSDA The same voltage as the HV line which is con- converter (IC7).
  • Page 11 CPU (IC20)—continued CPU (IC20)—continued Port Port Description Description number name number name Input port for MIC mute signal from the Input port for serial data signals from MMUT optional board via J1. XTXD the connected MAP27 unit via external connector (J9). OPT1–...

  • Page 12: Adjustment Procedures

    SECTION 5 ADJUSTMENT PROCEDURES I ADJUSTMENT SOFTWARE INSTALLATION Note: [MPT] versions must use ‘CS-F600’ instead of ‘CS-F500’. q Boot up Windows. 5-1 PREPARATION - Quit all applications when Windows is running. w Insert the ‘CS-F500’ into the appropriate CD-ROM drive. When you adjust the contents on pages 5-4 and 5-5, SOFT- e Select ‘Run’...
  • Page 13 • Screen display exampe CS-F500 ADJ Rev.1.0 File Option COM 1: OPEN Connect Reload (F5) Disp para [A / D] [D / A] : 156 : 9Ch : 12.24 V BPF T1 : 50 : 32h : 0.98 V TEMPS : 187 : BBh : 30.81 'C BPF T2 : 50 : 32h : 0.98 V...

  • Page 14: Pll Adjustment

    5-2 PLL ADJUSTMENT MEASUREMENT ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITIONS VALUE UNIT LOCATION UNIT ADJUST PLL LOCK • Operating freq. : 400.000 MHz MAIN Connect a digital multi- 1.0 V MAIN C133 VOLTAGE 440.000 MHz meter or an oscillo- 480.000 MHz scope to the check •...

  • Page 15: 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 freq. : 430.000 MHz Rear Loosely couple a frequnecy 430.0000 MHz [L] FREQUENCY...
  • Page 16 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 • Operating freq. : 400.000 MHz MAIN Connect a SINAD meter with a Minimum distortion 4 Ω...

  • Page 17: Parts List

    SECTION 6 PARTS LIST [FRONT UNIT] [FRONT UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 1130010800 S.IC LC75824W 4030011600 S.CERAMIC C1608 JB 1E 104K-T 1130008560 S.IC TC75S51F (TE85L) 4030011600 S.CERAMIC C1608 JB 1E 104K-T 4030011600 S.CERAMIC C1608 JB 1E 104K-T 4030007130 S.CERAMIC C1608 CH 1H 101J-T 1590000720 S.TRANSISTOR DTA144EUA T106 4030007090 S.CERAMIC...

  • Page 18: Main Unit

    [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 1110003490 S.IC TA31136FN (D, EL) 1750000710 S.VARICAP HVC350BTRF 1130008560 S.IC TC75S51F (TE85L) 1790000660 S.DIODE MA728 (TX) 1150002090 IC RA30H4047M-01 1790000620 S.DIODE MA77 (TX) 1150002030 IC RA30H4452M [M]-25W, [H] 1790000620 S.DIODE MA77 (TX) 1150002060 IC RA45H4452M [M]-45W...
  • Page 19 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION ERJ3GEYJ 221 V (220 Ω) 6200006980 S.COIL ELJRE R10G-F 7030003360 S.RESISTOR 6200005690 S.COIL ELJRE 18NG-F 7030003560 S.RESISTOR ERJ3GEYJ 103 V (10 kΩ) ERJ3GEYJ 561 V (560 Ω) 7030003410 S.RESISTOR 7030003500 S.RESISTOR ERJ3GEYJ 332 V (3.3 kΩ) 7030000620 S.RESISTOR MCR10EZHJ 100 kΩ...
  • Page 20 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION R173 7030003800 S.RESISTOR ERJ3GEYJ 105 V (1 MΩ) R262 7030003620 S.RESISTOR ERJ3GEYJ 333 V (33 kΩ) R174 7030003800 S.RESISTOR ERJ3GEYJ 105 V (1 MΩ) R263 7030003600 S.RESISTOR ERJ3GEYJ 223 V (22 kΩ) R175 7030003800 S.RESISTOR ERJ3GEYJ 105 V (1 MΩ)
  • Page 21 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 4030009910 S.CERAMIC C1608 CH 1H 040B-T 4030009920 S.CERAMIC C1608 CH 1H 050B-T 4030009530 S.CERAMIC C1608 CH 1H 030B-T [M], [H] 4030009910 S.CERAMIC C1608 CH 1H 040B-T [25W] 4030006860 S.CERAMIC C1608 JB 1H 102K-T 4030009350 S.CERAMIC C1608 CH 1H 3R5B-T [45W]...
  • Page 22 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION C174 4030011600 S.CERAMIC C1608 JB 1E 104K-T C280 4510004650 S.ELECTROLYTIC ECEV1EA4R7SR C176 4510005430 S.ELECTROLYTIC ECEV0JA220SR C281 4030011340 S.CERAMIC C1608 CH 1H 471J-T C177 4030007030 S.CERAMIC C1608 CH 1H 150J-T C282 4030011600 S.CERAMIC C1608 JB 1E 104K-T C178 4030007040 S.CERAMIC...
  • Page 23 [MAIN UNIT] ORDER DESCRIPTION C363 4030006980 S.CERAMIC C1608 CH 1H 070D-T C364 4030006980 S.CERAMIC C1608 CH 1H 070D-T C365 4030009920 S.CERAMIC C1608 CH 1H 050B-T C366 4030011600 S.CERAMIC C1608 JB 1E 104K-T C367 4030007090 S.CERAMIC C1608 CH 1H 470J-T C368 4550002890 S.TANTALUM TESVA 1A 225M1-8L C369...
  • Page 24 SECTION 7 MECHANICAL PARTS [CHASSIS PARTS] [FRONT UNIT] REF. ORDER REF. ORDER DESCRIPTION QTY. DESCRIPTION QTY. 6510004880 Connector MR-DS-E 01 7210003020 Variable resistor EVU-F2KFK1 2510001030 Speaker VS-57-0837A 6450002210 Connector 3017-8821 8600036860 Cable FX2527 P01CH DS12 5030002230 LCD L1-0483TAT 8900010950 Cable OPC-1126 8010018880 2526 chassis 8010018902...
  • Page 25 MP11 (C) J1 (C) MP1 (C) MAIN UNIT MP15 (M) MP12 (C) MP14 (C) MP12 (M) MP4 (M) MP1 (M) R12 (F) W1 (F) J4 (M) MP13 (M) MP13 (C) J1 (F) W2 (M) MP11 (C) MP3 (F) MP11 (M) MP14 (M) MP1 (F) MP5 (M)
  • Page 26 SECTION 8 SEMI-CONDUCTOR INFORMATION • TRANSSISTORS AND FET’S • DIODES 2SB1132 T100 R 2SC3356 R24 T2B 2SC4116 BL 2SC4213 B 2SC4215 O DA221 TL DAN222TL HVC350B HVC362 MA2S111 (Symbol: BAR) (Symbol: R24) (Symbol: LL) (Symbol: AB) (Symbol: QO) (Symbol: K) (Symbol: N) (Symbol: B0) (Symbol: V2)
  • Page 27 SECTION 9 BOARD LAYOUTS 9-1 FRONT UNIT • TOP VIEW microphone 9 - 1...
  • Page 28 • BOTTOM VIEW (FRONT UNIT) to MAIN unit J2 9 - 2...
  • Page 29 9-2 MAIN UNIT • TOP VIEW to DC cable to FRONT unit J2 to speaker DISC to optional cable OPC-617 PAAF HORN to optional unit 9 - 3...
  • Page 30 • BOTTOM VIEW (MAIN UNIT) 9 - 4...

  • Page 31: Block Diagram

    SECTION 10 BLOCK DIAGRAM 2SC4116 DTC144EU MA2S111 XP1214 MAIN UNIT RIPPLE 2SK880 400-520 MHz RX VCO LVIN BUFF D16 HVC350B 2SC4226 RA30H4047M [L] D2 UM9401F RA30H4452M [M]-25W, [H] D14, D15 D5 MA4PH224 D1, D11 RA45H4452M [M]-45W CR-671A D20 MA2S111 SA7026DH 2SC5107 2SC5107 MA77...
  • Page 32 SECTION 11 VOLTAGE DIAGRAMS FRONT UNIT DS12 L1-0483TAT DIM2 SEG22 SEG5 SEG23 SEG4 DTA144EU DTC144EU SEG24 SEG3 SEG25 SEG2 SEG26 SEG1 P12/S12 SEG27 P11/S11 DIM1 SEG28 P10/S10 SEG29 LC75824W P9/S9 SEG30 P8/S8 ON: 7.6V DTC144EU SEG31 HORN DTA144EU DIM: 6.1V P7/S7 SEG32 OFF: 0V...

  • Page 33: Main Unit

    MAIN UNIT (1) BUS LINE1 C366 C378 R209 6.9V 0.001 NTCG20 2SC4116 5.0V R292 2SK880 R108 8.2k 3.3k 3.3k IC11 R107 C161 TC75S51F C123 100p CR-671A 100k 12p[L] OPV1 R138 APST 2SC4226 8p[M],[H] C145 2SC4215 C372 OPV2 R139 AMSK R307 120k C118 1.8µ...
  • Page 34 CHASSIS MAIN UNIT (2) BUS LINE1 DTC144EU CPU5 R111 R112 C165 0.001 IC21 4.7µ NJM12902V R116 R117 C170 1.5k 5.6k 0.033 R130 27k R131 68k IC21a IC21d C166 NJM12902V R182 R181 R185 NJM12902V IC21b 0.001 C167 C168 C169 C190 NJM12902V 0.027 0.039 0.039...
  • Page 35 Unit 9, Sea St., Herne Bay, Kent, CT6 8LD, U.K. Phone : +44 (01227) 741741 Fax : +44 (01227) 741742 : http://www.icomuk.co.uk Icom (Australia) Pty. Ltd. E-mail : info@icomuk.co.uk A.B.N. 88 006 092 575 290-294 Albert Street, Brunswick, Victoria, 3056, Australia Icom France S.a...
  • Page 36 S-13817HZ-C1U-q 1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan C 2002 Icom Inc.

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