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Icom IC-F4TR Service Manual

Uhf trunked radio
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UHF TRUNKED RADIO
iC-f4tr

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  • Page 1 UHF TRUNKED RADIO iC-f4tr...
  • Page 2 INTRODUCTION This service manual describes the latest service information for the IC-F4TR UHF TRUNKED RADIO at the time of publication. To upgrade quality, all electrical or mechanical parts and internal circuits are subject to change without notice or obligation. DANGER...

  • Page 3: Table Of Contents

    TABLE OF CONTENTS SECTION 1 SPECIFICATIONS SECTION 2 INSIDE VIEWS SECTION 3 DISASSEMBLY INSTRUCTION SECTION 4 CIRCUIT DESCRIPTION 4 – 1 RECEIVER CIRCUITS ........................4 – 1 4 – 2 TRANSMITTER CIRCUITS ......................4 – 2 4 – 3 PLL CIRCUIT ..........................4 – 3 4 –...

  • Page 4: Specifications

    SECTION 1 SPECIFICATIONS ‘ ‘ GENERAL Frequency coverage : 450.000–490.000 MHz Type of emission : 16K0F3E (25 kHz) 11K0F3E (12.5 kHz) : 50 Ω nominal Antenna impedance Power supply requirement : 9.6 V DC (negative ground; supplied battery pack) Current drain at 9.6 V DC (approx.) : Transmit 1.4 A (at 4 W) 700 mA (at 1W)

  • Page 5: Inside Views

    SECTION 2 INSIDE VIEWS • MAIN UNIT TOP VIEW BOTTOM VIEW RF amplifier Low-pass filter circuit (Q12: 3SK293) Antenna switching diodes (D1, D8*, D406: MA77) 1st mixer circuit (Q13: 3SK241 R) APC controller (IC19: TA75S01F) 1st IF filter (FI1: FL-296) FM IF IC (IC2: TA31136FN) Microphone mute...

  • Page 6: Disassembly Instruction

    SECTION 3 DISASSEMBLY INSTRUCTION • Removing the cassis panel 1 Unscrew 1 nut A, and remove 1 nob B. 2 Unscrew 2 screws C. 3 Take off the chassis in the direction of the arrow. 4 Unplug J6 to separate front panel and chassis. Chassis (nickel, 2 mm) ×...

  • Page 7: Circuit Description

    SECTION 4 CIRCUIT DESCRIPTION 4-1 RECEIVER CIRCUITS The signals from the RF circuit are mixed at the 1st mixer (Q13) with a 1st LO signal coming from the VCO circuit to 4-1-1 ANTENNA SWITCHING CIRCUIT produce a 47.25 MHz 1st IF signal. Received signals are passed through the low-pass filter (L1–L3, C3–C5, C7).

  • Page 8: Transmitter Circuits

    The applied AF signals are amplified at the AF power ampli- 4-2-2 MODULATION CIRCUIT fier circuit (IC5, pin 4) to obtain the specified audio level. The The modulation circuit modulates the VCO oscillating signal amplified AF signals, output from pin 10, are applied to the (RF signal) using the microphone audio signal.

  • Page 9: Pll Circuit

    When the driving current is increased, input voltage of the 4-4 POWER SUPPLY CIRCUITS differential amplifier (IC19, pin 3) will be increased. In such VOLTAGE LINE cases, the differential amplifier output voltage (pin 4) is Line Description decreased to reduce the driving current. The voltage from the attached battery pack.
  • Page 10 4-5 PORT ALLOCATIONS CPU (IC17) Port Port Description Description number name number name Input port for the reset signal. BEEP Outputs beep audio signals. Input port for writing control signal. Outputs T5 regulator control signal. Low : Writing to CPU (IC17) Low: While transmitting CSHIFT Outputs CPU clock shift signal.

  • Page 11: Parts List

    SECTION 6 PARTS LIST [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 1130009130 S.IC SA7025DK-T 1720000370 S.VARICAP HVU350TRF 1110003490 S.IC TA31136FN (D,EL) 1720000370 S.VARICAP HVU350TRF 1110003780 S.IC NJM2902V-TE1 1720000370 S.VARICAP HVU350TRF 1130008090 S.IC BU4066BCFV-E1 1790001250 S.DIODE MA2S111-(TX) 1110001810 S.IC TA7368F (TP1) 1750000130 S.DIODE DA204U T107 1180001940 S.IC...
  • Page 12 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION L420 6200004780 S.COIL MLF1608A 1R5K-T R125 7030005600 S.RESISTOR ERJ2GEJ 273 X (27 kΩ) ERJ2GEJ 4R7 X (4.7 Ω) L421 6200004780 S.COIL MLF1608A 1R5K-T R126 7030009320 S.RESISTOR ERJ3GEYJ 100 V (10 Ω) L422 6200004780 S.COIL MLF1608A 1R5K-T R127...
  • Page 13 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION R453 7030005230 S.RESISTOR ERJ2GEJ 334 X (330 kΩ) R562 7030005090 S.RESISTOR ERJ2GEJ 104 X (100 kΩ) R455 7030005090 S.RESISTOR ERJ2GEJ 104 X (100 kΩ) R563 7030005050 S.RESISTOR ERJ2GEJ 103 X (10 kΩ) R456 7030005030 S.RESISTOR ERJ2GEJ 152 X (1.5 kΩ)
  • Page 14 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 4030014490 S.CERAMIC ECUE1E331KBQ C147 4030014490 S.CERAMIC ECUE1E331KBQ 4030014490 S.CERAMIC ECUE1E331KBQ C148 4030016930 S.CERAMIC ECJ0EB1A104K 4030014490 S.CERAMIC ECUE1E331KBQ C149 4030016960 S.CERAMIC ECJ0EB1C183K 4030014200 S.CERAMIC ECUE1H101JCQ C150 4550006200 S.TANTALUM ECST0JY106R 4550006410 S.TANTALUM ECST1VY334R C151 4030014180 S.CERAMIC ECUE1H470JCQ 4030014490 S.CERAMIC...
  • Page 15 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION C404 4030014490 S.CERAMIC ECUE1E331KBQ C523 4030014180 S.CERAMIC ECUE1H470JCQ C405 4030014070 S.CERAMIC ECUE1H040BCQ C524 4030016930 S.CERAMIC ECJ0EB1A104K C406 4030014110 S.CERAMIC ECUE1H080CCQ C525 4030016930 S.CERAMIC ECJ0EB1A104K C407 4030014490 S.CERAMIC ECUE1E331KBQ C526 4030014180 S.CERAMIC ECUE1H470JCQ C408 4030014490 S.CERAMIC ECUE1E331KBQ...

  • Page 16: Vr Board

    [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION C613 4030014180 S.CERAMIC ECUE1H470JCQ 7030003860 S.JUMPER ERJ3GE JPW V C614 4030014220 S.CERAMIC ECUE1E471KBQ 7030003860 S.JUMPER ERJ3GE JPW V C615 4030014180 S.CERAMIC ECUE1H470JCQ C616 4030014220 S.CERAMIC ECUE1E471KBQ C617 4030014220 S.CERAMIC ECUE1E471KBQ 8600035811 CABLE FX1923 P01MA-1 C618 4030014490 S.CERAMIC...
  • Page 17 SECTION 7 MECHANICAL PARTS AND DISASSEMBLY 7-1 CABINET PARTS 7-2 ACCESSORIES [CHASSIS PARTS] ORDER ORDER QTY. DESCRIPTION DESCRIPTION QTY. 8010016822 1922 chassis-2 Optional product Antenna FA-SC56U-2 8210014731 1922 front panel (B) assembly [24 keys] 8210015161 2066 front panel (A) assembly [7 keys] Optional product Battery BP-196 8210014330 1922 contact base...
  • Page 18 7 keys MP36 (C) MP26 (C) MP12 (C) MP25 (C) MP4 (C) MP29 (C) MP40 (C) MP34 (C) MP28 (C) MP6 (C) MP9 (C) MP19 (C) MP10 (C) MP13 (C) MP4 (M) MP1 (M) MP10 (M) VR BOARD MP1 (C) MP27 (C) MP31 (C) MP22 (C)
  • Page 19 SECTION SECTION 8 PARTS LIST SEMI-CONDUCTOR INFORMATIONS 8 - 1 TRANSISTORS AND FET’S NAME SYMBOL INSIDE VIEW NAME SYMBOL INSIDE VIEW NAME SYMBOL INSIDE VIEW NAME SYMBOL INSIDE VIEW 2SK2596BXTL HVU350TRF 2SA1362-GR XP6401 B2 E2 3SK239XR - TL MA77 2SB1132 - R 3SK241 - R XP6501 - AB 3SK293...
  • Page 20 SECTION 9 BOARD LAYOUTS The combination of this page and the next page shows 9 - 1 MAIN UNIT the unit layout in the same configuration as the actual P.C. Board. MICROPHONE • TOP VIEW VR unit VLOUT VLIN to SP1 ANTENNA Surface 9 - 2 VR BOARD...
  • Page 21 The combination of this page and the previous page shows the unit layout in the same configuration as the actual P.C. Board. MICROPHONE • BOTTOM VIEW EXT. SP CLONE EXT. MIC Surface CHARGER • BOTTOM VIEW VL OUT MAIN unit VL IN Surface 9 - 2...

  • Page 22: Block Diagram

    SECTION 10 BLOCK DIAGRAM CLONE SP JACK Q31, D27 IC22 D3, D4 Q403 D1, D8, D406 BUFF TCXO PLL IC LOOP TX/RX DRIVE BUFF BUFF BUFF FILTER DRIVE 15.6 MHz FRQCON Q15,Q16 BUFF IC19 AFON AFMT VOL BOARD MODCON AFOUT LVIN BUFF Q415...

  • Page 23: Voltage Diagram

    SECTION 11 VOLTAGE DIAGRAM ISENS ISENS FRQCON MODCON C556 C558 C553 C627 NFM60R20T152 R161 C555 C557 C554 C552 Q404 2SC4116 BL L417 4.17V 0.15 47µH DETIN C234 R185 330p R587 R573 C604 R582 D405 CTCSS L409 C595 1.50V 330p R184 R450 R411 4.7µH...
  • Page 24 290-294 Albert Street, Brunswick, Victoria, 3056, Australia : http://www.icomuk.co.uk Phone : 03 9387 0666 Fax : 03 9387 0022 : http://www.icom.net.au Zac de la Plaine, Rue Brindejonc des Moulinais BP 5804, 31505 Toulouse Cedex, France 6F No. 68, Sec. 1 Cheng-Teh Road, Taipei, Taiwan, R.O.C.
  • Page 25 S-13606MS-CD 6-9-16, Kamihigashi, Hirano-ku, Osaka 547-0002, Japan © 2000 Icom Inc.

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