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Icom IC-F4021T Service Manual

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SERVICE
MANUAL
UHF TRANSCEIVERS
S-14304HZ-C1
July 2006

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Summary of Contents for Icom IC-F4021T

  • Page 1 SERVICE MANUAL UHF TRANSCEIVERS S-14304HZ-C1 July 2006...
  • Page 2 8. READ the instructions of test equipment thoroughly before connecting equipment to the transceiver. Icom, Icom Inc. and logo are registered trademarks of Icom Incorporated (Japan) in the United States, the United Kingdom, Germany, France, Spain, Russia and/or other countries.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS SECTION SPECIFICATIONS SECTION INSIDE VIEWS SECTION DISASSEMBLY INSTRUCTIONS SECTION OPTIONAL UNIT INSTALLATION SECTION CIRCUIT DESCRIPITON RECEIVER CIRCUITS............5-1 TRANSMITTER CIRCUITS .
  • Page 4 50 Ω (nominal) • Antenna impedance • Operating temperature range −22˚F to +140˚F –25˚C to +55˚C • Power supply requirement Specified Icom’s battery packs only (Operatable voltage; 7.2 V DC negative ground) • Current drain Stand-by 75 mA (approx.) Max.audio...
  • Page 5 SECTION 2 INSIDE VIEWS MAIN UNIT TOP VIEW BOTTOM VIEW +5 regulator AF amplifier Q26: 2SB1580 (IC15: TA7368FG) CPU5 regulator Q27: XP6501 (IC17: NJM2870) Q28: UNR9213J IF amplifier TX VCO 1st mixer (Q7: 2SC5107) Q16: 2SC4226 (Q6: 3SK324) D10, D13: HVC350B R5 regulator PLL IC RX VCO...

  • Page 6: Disassembly Instructions

    SECTION 3 DISASSEMBLY INSTRUCTIONS 1 REMOVING THE CHASSIS UNIT q Unscrew ANT nut A, and remove knob B. e Unscrew 6 screws J. w Unscrew 2 screws C, and remove the jack panel. r Remove the side plate I. e Unscrew 2 screws D, and unplug the connector E from t Unsolder 8 points K, and remove the shield cover.
  • Page 7 SECTION 4 OPTIONAL UNIT INSTALLATION CAUTION! Optional unit installation should be done at authorized Icom servise center only. Install the optional unit as follows. r Install the unit as below. q Rotate [VOL] to turn the power OFF, and remove the battery pack.

  • Page 8: Circuit Descripiton

    SECTION 5 CIRCUIT DESCRIPTION 5-1 RECEIVER CIRCUITS The converted 1st IF signal is passed through the 1st IF fi lter (FI1) to filter-out adjacent signals, then applied to the 1st IF 5-1-1 ANTENNA SWITCHING CIRCUIT (PA UNIT) amplifi er (Q7). The amplifi ed 1st IF signal is then applied to the The antenna switching circuit toggles the receive (RX) line and FM IF IC (IC9, pin 16).

  • Page 9: Transmitter Circuits

    The AF signals from the analog switch (IC3, pin 11) are 5-2 TRANSMITTER CIRCUITS applied to the volume buffer amplifi er (IC6, pin 9). The buffer- 5-2-1 MICROPHONE AMPLIFIER CIRCUITS amplified AF signals are adjusted its level (= audio level) (MAIN UNIT) by volume control pot (R315), then applied to the AF power The AF signals from the microphone (MIC signals) are fi...
  • Page 10 5-2-3 TRANSMIT AMPLIFIERS (PA UNIT) 5-2-4 APC CIRCUIT (PA UNIT) The transmit signal from the VCO is amplifi ed to the transmit The APC (Automatic Power Control) circuit prevents the output level by the transmit amplifi ers. transition of the transmit output power level which is caused by load mismatching or heat effect, etc.

  • Page 11: Pll Circuits

    5-3 PLL CIRCUITS 5-3-2 PLL IC (MAIN UNIT) The PLL circuit provides stable oscillation of the transmit 5-3-1 VOLTAGE CONTROLLED OSCILLATORS frequency and receive 1st LO frequency. The PLL output (VCOs; MAIN UNIT) frequency is controlled by the divided ratio (N-data) from the VCO is an oscillator whose oscillating frequency is controlled CPU.

  • Page 12: Power Supply Circuits

    5-4 POWER SUPPLY CIRCUITS Voltage from the attached battery pack is routed to whole of the circuit in the transceiver via a switch and regulators. Power switch F701 (PA unit ) Drive amplifier (Q702), Power amplifier (Q701), etc. IC17 CPU (IC22), CPU5 CPU5V EEPROM (IC10),...

  • Page 13: Port Allocations

    5-5 PORT ALLOCATIONS Port Description Name 5-5-1 CPU (IC22) Outputs Analog/Digital select signal to the A/D Port Description DIGI switch (D2, D3). Name “High”=Digital mode is selected. KR1− 1−3 Input ports for dealer-programmable keys. Outputs serial data to the LCD driver (IC20, pin 48). LSCK Outputs clock signal to the LCD driver (IC20, pin 47).

  • Page 14: Adjustment Procedures

    [Next>] to install the software to the destination folder. (e.g. items as below. C:\Program Files\Icom\CS-F3020 ADJ) t Set or modify adjustment data as specifi ed. y After the installation is completed, the “InstallShield Wiz- ard Complete”...
  • Page 15 • CONNECTION Attenuator Osciiloscope 10 dB or 20 dB deviation meter Standard signal generator 0.1 µV to 32 mV RF power meter (–127 dBm to –17 dBm) 0.1–5 W/50 CAUTION! Frequency DO NOT transmit while counter the SSG is connected to OPC-478 (RS-232C type) the antenna connector to RS-232C port...
  • Page 16 • PC SCREEN EXSAMPLE Transmit output power (Hi) Reference frequency Receive sensitivity (Automatically) Transmit output power (L2) Receive sensitivity (Manually) Transmit output power (L1) Modulation balance PLL lock voltage FM deviation (Narrow) PLL lock voltage preset FM deviation (Middle*/Wide) S-meter PLL lock voltage (verify) CTCSS/DTCS deviation Squelch...

  • Page 17: Frequency Adjustment

    6-2 FREQUENCY ADJUSTMENT Select an adjustment item using [↑] / [↓] keys, then set to the specifi ed value using [←] / [→] keys on the connected PC’s keyboard. MEASUREMENT ADJUSTMENT ADJUSTMENT CONDITION VALUE UNIT OPERATION PLL LOCK 1 • Channel : CH 1 Click [Reload (F5)] button, then 1.2 V...

  • Page 18: Transmit Adjustment

    6-3 TRANSMIT ADJUSTMENT Select an adjustment item using [↑] / [↓] keys, then set to the specifi ed value using [←] / [→] keys on the connected PC’s keyboard. MEASUREMENT ADJUSTMENT ADJUSTMENT CONDITION VALUE UNIT OPERATION OUTPUT 1 • Channel : CH 3 Connect an RF power meter to 4.0 W...

  • Page 19: Receive Adjustment

    6-4 RECEIVE ADJUSTMENT Select an adjustment item using [↑] / [↓] keys, then set to the specifi ed value using [←] / [→] keys on the connected PC’s keyboard. MEASUREMENT ADJUSTMENT ADJUSTMENT CONDITION VALUE UNIT LOCATION RECEIVE NOTE: “RECEIVE SENSITIVITY” must be adjusted before “S-METER.” Otherwise, “S-METER” will not be SENSITIVITY adjusted properly.
  • Page 20 SECTION 7 PARTS LIST [MAIN-A UNIT] (for Low band) [MAIN-A UNIT] (for Low band) ORDER ORDER DESCRIPTION DESCRIPTION LOCATION LOCATION 1140005991 S.IC MB15A02PFV1-G-BND-ERE1 81.2/34.5 6070000191 S.DCR CDBKB450KCAY24-R0 80/16.9 1130011770 S.IC CD4066BPWR 40.4/22 6050011940 S.XTL CR-783 (15.3 MHz) 1110005320 S.IC NJM13403V-TE1 40.4/12.8 [F4021], [F4023] only B 61.6/38.9...
  • Page 21 [MAIN-A UNIT] (for Low band) [MAIN-A UNIT] (for Low band) ORDER ORDER DESCRIPTION DESCRIPTION LOCATION LOCATION 7030005310 S.RES ERJ2GEJ 124 X (120 k) 74.9/29.1 R202 7030004980 S.RES ERJ2GEJ 101 X (100) 96.6/38.1 7030006020 S.RES RR0510P-682-D (6.8 k) 74.7/34.3 R203 7030010040 S.RES ERJ2GEJ-JPW 58.4/25.4 7030005060 S.RES ERJ2GEJ 333 X (33 k) 75.5/28.7...
  • Page 22 [MAIN-A UNIT] (for Low band) [MAIN-A UNIT] (for Low band) ORDER ORDER DESCRIPTION DESCRIPTION LOCATION LOCATION R364 7030005160 S.RES ERJ2GEJ 105 X (1 M) 29.4/14.9 C115 4030017630 S.CER ECJ0EC1H120J 73.8/34.3 R367 7030004980 S.RES ERJ2GEJ 101 X (100) 23.9/9.8 C116 4030016790 S.CER ECJ0EB1C103K 75.6/34.3 R368 7030005090 S.RES ERJ2GEJ 104 X (100 k)
  • Page 23 [MAIN-A UNIT] (for Low band) [MAIN-A UNIT] (for Low band) ORDER ORDER DESCRIPTION DESCRIPTION LOCATION LOCATION C250 4030016930 S.CER ECJ0EB1A104K 43.9/6.8 C401 4030018860 S.CER ECJ0EB0J105K 71.2/28.2 C251 4030016950 S.CER ECJ0EB1A473K 34.7/10.9 C402 4030017460 S.CER ECJ0EB1E102K 97.1/26.8 C252 4030016950 S.CER ECJ0EB1A473K 34.7/9.2 C406 4030016930 S.CER ECJ0EB1A104K...
  • Page 24 [MAIN-B UNIT] (for High band) [MAIN-B UNIT] (for High band) ORDER ORDER DESCRIPTION DESCRIPTION LOCATION LOCATION 1590001400 S.TR XP1214 (TX) 71.3/31.7 7030005080 S.RES ERJ2GEJ 823 X (82 k) 93.4/38.3 1590003290 S.TR UNR9213J-(TX) 71.4/29.3 7030005110 S.RES ERJ2GEJ 224 X (220 k) 88.2/35.2 1530002851 S.TR 2SC4116-BL (TE85R F)
  • Page 25 [MAIN-B UNIT] (for High band) [MAIN-B UNIT] (for High band) ORDER ORDER DESCRIPTION DESCRIPTION LOCATION LOCATION R155 7030005720 S.RES ERJ2GEJ 563 X (56 k) 35.9/37.1 R279 7030005090 S.RES ERJ2GEJ 104 X (100 k) 12.8/4.7 R156 7030005050 S.RES ERJ2GEJ 103 X (10 k) 48.1/16.4 R280 7030005090 S.RES ERJ2GEJ 104 X (100 k)
  • Page 26 [MAIN-B UNIT] (for High band) [MAIN-B UNIT] (for High band) ORDER ORDER DESCRIPTION DESCRIPTION LOCATION LOCATION 4550007090 S.TAN TEESVA 1A 226M8R 96.6/35.1 C232 4030016790 S.CER ECJ0EB1C103K 85.6/9.2 4030017420 S.CER ECJ0EC1H470J 98.2/38.1 C233 4550007090 S.TAN TEESVA 1A 226M8R 98/16.8 4030017420 S.CER ECJ0EC1H470J 102.7/32.5 C234 4030016790 S.CER ECJ0EB1C103K...
  • Page 27 [MAIN-B UNIT] (for High band) [PA-A UNIT] (for Low band) ORDER ORDER DESCRIPTION DESCRIPTION LOCATION LOCATION C386 4030016930 S.CER ECJ0EB1A104K 58.9/13.5 L701 6200002851 S.COL NLV25T-R82J 34.7/11 C387 4030016930 S.CER ECJ0EB1A104K 60.9/14.6 L703 6200009470 S.COL 0.40-0.9-2TL 29.9/13.7 C388 4030016930 S.CER ECJ0EB1A104K 60.9/13.7 L704 6200009470 S.COL 0.40-0.9-2TL...
  • Page 28 [PA-A UNIT] (for Low band) [PA-B UNIT] (for High band) ORDER ORDER DESCRIPTION DESCRIPTION LOCATION LOCATION C718 4030017420 S.CER ECJ0EC1H470J 17.3/2.1 C785 4030016790 S.CER ECJ0EB1C103K 16.8/23.7 C719 4030016790 S.CER ECJ0EB1C103K 20.1/13.5 C786 4030018860 S.CER ECJ0EB0J105K 16.4/19.8 C787 4030017460 S.CER ECJ0EB1E102K 16.4/20.7 C722 4030017420 S.CER ECJ0EC1H470J...

  • Page 29: Connect Unit

    [CONNECT UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION LOCATION LOCATION C901 4030017460 S.CER ECJ0EB1E102K 6.1/7 7030000010 S.RES MCR10EZHJ JPW 23.5/5.7 C902 4030017420 S.CER ECJ0EC1H470J 6.1/6 7030008240 S.RES ERJ12YJ0R00U 34.1/38.2 C905 4030017420 S.CER ECJ0EC1H470J 9.4/7.3 7030000010 S.RES MCR10EZHJ JPW 23.9/34.9 C906 4030017460 S.CER ECJ0EB1E102K 9.4/6.3 7030000010 S.RES MCR10EZHJ JPW...

  • Page 30: Ant Unit

    SECTION 8 MECHANICAL PARTS AND DISASSEMBLY [CHASSIS PARTS] [PA UNIT] REF. ORDER REF. ORDER DESCRIPTION QTY. DESCRIPTION QTY. 6910015910 Connector ANT connector-104 J701 6910017680 Connector IMSA-9230B-1-04Z140-PT1 6910015860 Connector IMSA-6277S-02A-G J702 6910017680 Connector IMSA-9230B-1-04Z140-PT1 2510001061 Speaker K036NA500-67 MP701* 8410002530 2681 PA heatsink MP702 8510018030 2927 PA-shield plate...
  • Page 31 * MP2 (C), MP12 (C): The shape is depending on the version. Unit: mm (inch) MP13 (C) MP25 (C) J1 (C) SP1 (C) MP35 (C) W1 (C) MP8 (C) MP24 (C) MP31 (C) ANT Unit MP1 (C) MP801 (A) MP17 (C) MP20 (C) MP33 (C) CONNECT Unit...
  • Page 32 SECTION 9 SEMICONDUCTOR INFORMATION • TRANSISTORS AND FET's • DIODES 2SA1577 T106 R 2SB1132 T100 R 2SB1580 T100 2SC3356 2SC4081 T106 R 1SV307 DAN222TL HVC350B MA2S077 MA2S111 (Symbol: HR) (Symbol: BAR) (Symbol: BN) (Symbol: R25) (Symbol: BR) (Symbol: TX) (Symbol: N) (Symbol: B0) (Symbol: S) (Symbol: A)
  • Page 33 SECTION 10 BOARD LAYOUTS • MAIN UNIT (TOP VIEW) SWITCH H100 H105 to SPEAKER “SP1” (CHASSIS) • PA UNIT (TOP VIEW) • ANT UNIT (TOP VIEW) • BC-160 (TOP VIEW) (CHASSIS) • CONNECT UNIT (TOP VIEW) J901 to PA unit (No patterns) to Battery Connector “J2”...
  • Page 34 • MAIN UNIT (BOTTOM VIEW) SIDE1 SIDE2 SIDE3 ISENS PA unit “J702” VR & POWER SWITCH SPEAKER to PA unit “J701” H105 H100 • PA UNIT (BOTTOM VIEW) J702 ISENS CONNECT unit to ANT unit “J901” to MAIN unit • ANT UNIT •...
  • Page 35 SECTION 11 BLOCK DIAGRAM Q18: XP1214 Q19: UNR9213J MAIN UNIT 400-470 MHz 450-512 MHz 450-520 MHz TX/RX 2SC4116 LVIN RIPPLE PA UNIT BUFF D16:1SV307 D9 : HVC350B RX VCO D17: MA2S077 D11: HVC350B RLVA 2SC4226 2SC5700 2SK880 15.3 MHz TX/RX BUFF BUFF Q704...
  • Page 36 SECTION 12 VOLTAGE DIAGRAMS 12 - 1...
  • Page 37 CONNECT UNIT J901 L901 L902 BLM21P300S BLM21P300S BATT BATTERY CONNECTOR L903 BLM21P300S TX: 7.0V TX: 7.1V F701 RX: 7.2V RX: 7.2V 0467003.NR R729 0.15 R730 1k TO CONNECT UNIT J901 Q705 XP6401 EP701 ACZ1005Y C762 0.5p C761 C731 0.5p Q703 TX: 6.5V 2SC3356 RX: 6.8V...
  • Page 38 SECTION 13 BC-160 [CHASSIS PARTS] RSQ035P03TR REF. ORDER DESCRIPTION QTY. 100µ CHARGE 8010019750 2830 case 8110008220 2830 cover 8930039620 Leg cushion (A) 2SC4081 1SS355 Screw PH BT M3 × 6 NI-ZU 8810008630 2SC4081 VSENS 5.00V battery 4.7k 9.6uS 10.05V MCR10-JPW 16.0V NJM2801U1-0543-TE1 MCR10-JPW...
  • Page 39 Phone : +34 (93) 590 26 70 Fax : +34 (93) 589 04 46 Glenwood Centre #150-6165 : http://www.icomspain.com Highway 17 Delta, B.C., V4K 5B8, Canada E-mail : icom@icomspain.com Phone : +1 (604) 952-4266 Fax : +1 (604) 952-0090 : http://www.icomcanada.com E-mail : info@icomcanada.com Unit 9, Sea St., Herne Bay, Kent, CT6 8LD, U.K.
  • Page 40 S-14304HZ-C1 1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan © 2006 Icom Inc.

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