Icom IC-UR8050 Service Manual
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Icom IC-UR8050 Service Manual

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SERVICE
MANUAL
UHF REPEATER
iUR8050

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Summary of Contents for Icom IC-UR8050

  • Page 1 SERVICE MANUAL UHF REPEATER iUR8050...
  • Page 2 µPD4049UBG IC-UR8050 MAIN UNIT 5 pieces repeater is defective. 8810008660Screw PH B0 M3x6 NI-ZU IC-UR8050 Top cover 10 pieces 6. DO NOT transmit power into a signal generator or a Addresses are provided on the inside back cover for your sweep generator.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS SECTION 1 SPECIFICATIONS SECTION 2 CIRCUIT DESCRIPTION 2 - 1 RECEIVER CIRCUITS..........................2 - 1 2 - 2 TRANSMITTER CIRCUITS........................2 - 2 2 - 3 PLL CIRCUITS............................2 - 3 2 - 4 POWER SUPPLY CIRCUITS ........................2 - 4 2 - 5 PORT ALLOCATIONS ..........................
  • Page 4 SECTION 1 SPECIFICATIONS GENERAL • Frequency range 400–430 MHz • Mode FM (F3) • Frequency Resolution 5 or 12.5 kHz (Selectable) 50 Ω • Antenna impedance • Power supply requirement DC 13.8 V ± 15 % (negative ground) • Current drain (at 13.8 V DC) 15 A Transmit Standby...

  • Page 5: Circuit Description

    SECTION 2 CIRCUIT DESCRIPTION 2-1 RECEIVER CIRCUITS The 455 kHz 2nd IF signal is applied to a ceramic band-pass filter (FI2) where unwanted signals are suppressed and then 2-1-1 RF CIRCUIT (RF UNIT) to a limiter amplifier section in system IC (IC5, pin 5). Received signal enter the antenna connector (J3) and pass through a band-pass filter (C4–C7, C11–C13, D3, D4, L1, IC5 contains the local oscillator circuit, quadrature detector...

  • Page 6: Transmitter Circuits

    2-2 TRANSMITTER CIRCUITS 2-2-4 RF POWER AMPLIFIER CIRCUIT (PA UNIT) 2-2-1 MICROPHON AMPLIFIER CIRCUIIT IC1 is a power module which provides a stable 45 W of out- put power. (LOGIC UNIT) The microphone amplifier circuit (IC16) amplifies the audio The amplified signal from the TX unit passes through the signals from the microphone.

  • Page 7: Pll Circuits

    2-3 PLL CIRCUITS 2-3-5 TRANSMITTER PLL CIRCUIT (TX UNIT) 2-3-1 GENERAL The PLL IC (IC3) which includes in the prescaler, the pro- grammable counter and the phase comparator generates Each receiver and transmitter circuit has an independent the 1st LO frequency with a Colpitts VCO (D2, D3, Q2). The PLL circuit for controlling frequencies.

  • Page 8: Power Supply Circuits

    2-4 POWER SUPPLY CIRCUIT 2-5 PORT ALLOCATIONS 2-4-1 VOLTAGE LINES 2-5-1 CPU (LOGIC UNIT IC1) LINE DESCRIPTION Port Description number name The voltage from the connected DC power sup- Outputs LOCAL INHIBIT LED control ply. The output voltage is applied to the CPU P62 / A18 13.8 V signal .

  • Page 9: Adjustment Procedures

    9 – 16 V/20 A Attenuator FM deviation Oscilloscope meter 50 dB or 60 dB Standard signal generator Frequency counter DC POWER SOCKET PA UNIT BOARD LOGIC UNIT IC-UR8050 (TOP view) Audio generator UNIT TX UNIT FRONT UNIT VOL SQL 3 - 1...

  • Page 10: Pll And Transmitter Adjustments

    3-2 PLL AND TRANSMITTER ADJUSTMENTS MEASUREMENT ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITIONS VALUE UNIT LOCATION UNIT ADJUST PLL LOCK • Operating freq. : 415.000 MHz Connect a digital multi- 2.7 V VOLTAGE • Apply DC voltage : 13.8 V meter or an oscillo- [VOLUME] : Max.
  • Page 11 • TX unit R43 (R–MOD) R38 (F–SET) Maximum deviation Reference frequency adjustment adjustment Audio generator connect point PLL lock voltage check point for TX F.SET R-MOD 1 kHz/ 1 V R50 (MOD) Maximum deviation adjustment PLL lock voltage 2 (MOD) adjustment for TX 3 (GND) •...

  • Page 12: Acc Levels, Regulator Output And Receiver Adjustments

    3-3 ACC LEVELS, REGULATOR OUTPUT AND RECEIVER ADJUSTMENTS MEASUREMENT ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITIONS VALUE UNIT LOCATION UNIT ADJUST ACC OUPUT • [LOCAL INHIBIT] switch : ON Rear Connect a millivolt- 0 dBm LOGIC meter and 600 Ω ter- LEVEL (DO) •...
  • Page 13 • LOGIC unit Regulator output voltage adjustment R52 (LI) R102 ACC input level (VD, L) adjustment (VD, H) ACC (1) R35 (LO) Regulator ACC output level adjustment output voltage R30 (DO) checkpoints ACC output level adjustment R83 (DI) ACC output level adjustment R91 (SQL) Squelch level adjustment •...

  • Page 14: Parts List

    SECTION 4 PARTS LIST [FRONT UNIT] [LED UNIT] ORDER ORDER DESCRIPTION DESCRIPTION ERJ3GEYJ 821 V (820 Ω) 7210000140 VARIABLE RK1631110D9DA (10KA) 7030003430 S.RESISTOR ERJ3GEYJ 821 V (820 Ω) 7210000690 VARIABLE RK1631110D9CA (10KB) 7030003430 S.RESISTOR ERJ3GEYJ 821 V (820 Ω) 7030003430 S.RESISTOR ERJ3GEYJ 821 V (820 Ω) 7030003430 S.RESISTOR ERJ3GEYJ 821 V (820 Ω)
  • Page 15 [LOGIC UNIT] [LOGIC UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 1790001200 S.DIODE MA6S121(TX) 7310002670 S.TRIMMER RV-143 (RH03A3AS2) 471 1790001200 S.DIODE MA6S121(TX) 7030003480 S.RESISTOR ERJ3GEYJ 222 V (2.2 KΩ) 1790001200 S.DIODE MA6S121(TX) 7030003560 S.RESISTOR ERJ3GEYJ 103 V (10 KΩ) 1790001200 S.DIODE MA6S121(TX) 7030003720 S.RESISTOR ERJ3GEYJ 224 V (220 KΩ) 1790001200 S.DIODE MA6S121(TX)
  • Page 16 [LOGIC UNIT] [LOGIC UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 4550006360 S.TANTALUM ECST1VY104R 4030007130 S.CERAMIC C1608 CH 1H 101J-T-A 4510004630 S.ELECTROLYTIC ECEV1CA100SR 4030007130 S.CERAMIC C1608 CH 1H 101J-T-A 4030006860 S.CERAMIC C1608 JB 1H 102K-T-A 4030006850 S.CERAMIC C1608 JB 1H 471K-T-A 4510005310 S.ELECTROLYTIC ECEV1CA220SR 4030006850 S.CERAMIC C1608 JB 1H 471K-T-A 4510005310 S.ELECTROLYTIC ECEV1CA220SR...
  • Page 17 [RX UNIT] [RX UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 1790001310 S.VARICAP 1SV270(TPH3) 7030003520 S.RESISTOR ERJ3GEYJ 472 V (4.7 kΩ) 1750000550 S.DIODE 1SS355 TE-17 7030003550 S.RESISTOR ERJ3GEYJ 822 V (8.2 kΩ) 1790000950 S.ZENER MA8056-M(TX) 7030003450 S.RESISTOR ERJ3GEYJ 122 V (1.2 kΩ) 1790000620 S.DIODE MA77(TX) 7030003720 S.RESISTOR ERJ3GEYJ 224 V (220 kΩ)
  • Page 18 [RX UNIT] [RX UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 4030007020 S.CERAMIC C1608 CH 1H 120J-T-A 6510003570 CONNECTOR S09B-EH-S 4030006900 S.CERAMIC C1608 JB 1E 103K-T-A 6510003510 CONNECTOR S03B-EH-S 4030006900 S.CERAMIC C1608 JB 1E 103K-T-A 6510013350 CONNECTOR C05-LR-03 4030006870 S.CERAMIC C1608 JB 1H 222K-T-A 4030012610 S.CERAMIC C2012 JB 1C 474K-T-A 4030006900 S.CERAMIC...
  • Page 19 [TX UNIT] [TX UNIT] ORDER ORDER DESCRIPTION DESCRIPTION MCR50JZHJ 10 Ω (100) 7030001010 S.RESISTOR 4030006850 S.CERAMIC C1608 JB 1H 471K-T-A ERJ3GEYJ 681 V (680 Ω) 7030003420 S.RESISTOR 4550006770 S.TANTALUM TEMSVD2 1C 476M-12R ERJ3GEYJ 390 V (39 Ω) 7030003270 S.RESISTOR 4030006940 S.CERAMIC C1608 CH 1H 030C-T-A ERJ3GEYJ 390 V (39 Ω) 7030003270 S.RESISTOR...
  • Page 20 [REG UNIT] [PA UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 1180001320 IC NJM7809FA 7030003610 S.RESISTOR ERJ3GEYJ 273 V (27 kΩ) 7510000850 S.THERMISTOR NTCCF2012 3BH 102KC-T ERJ3GEYJ 821 V (820 Ω) 7030003430 S.RESISTOR 1790000700 DIODE DSA3A1 4030011080 S.CERAMIC GRM42-6 CH 060D 500PT 7010004680 RESISTOR 4030011070 S.CERAMIC GRM42-6 CH 050C 500PT 7010004680 RESISTOR...
  • Page 21 SECTION 5 BLOCK DIAGRAM IC5 TA31136F D3/D4 #03 FL-199 D8/D9 D5/D7 2SC2714 #04 FL-238 1SV270 3SK184 1SV270 3SK166 1SV270 3SK184 CB424 NOISE RX ANT FILTER CONNECTOR FRONT UNIT D10 1SV270 D11 1SV270 S OUT 2SC4226 2SC4226 Q4 2SC5186 IC4 TA75S01F CR-473 IC15 IC13B...
  • Page 22 SECTION 6 VOLTAGE DIAGRAM • LOGIC UNIT BOARD IC12A P0\0 P0\1 +13.8V DATA NJM4558M 10 k 100 k +13.8V 8.8 V 22 k +13.8V R LE P0\3 +13.8V 4.1 V BOARD 0.8 V 0.01 UNLOCK P7\1 RX UNIT SQL SW P7\0 7.0 V 10 k...
  • Page 23 • TX, PA AND REG UNIT 8.18 V RX: 0.00 V 470 p 0.001 0.001 0.001 0.001 TX: 8.00 V 10 µH 10 p 470 p 470 p 0.022 1SV270 10 k MC152 470 p 100 k 47 nH 0.001 0.001 470 p 0.001...
  • Page 24 • RX UNIT 15 k C150 R15 18 k 3.46 V 470 p 470 p 2.35 V 0.001 C151 10 k MC152 470 p 470 p MC152 0.001 6.8 k 0.001 15 k 1.73 V CHASSIS 0.001 1.5 p 0.75 p 0.75 p 0.75 p 0.75 p...
  • Page 25 Highway 17 Delta, B.C., V4K 5B8, Canada : http://www.icomspain.com Phone : +1 (604) 952-4266 Fax : +1 (604) 952-0090 E-mail : icom@icomspain.com : http://www.icomcanada.com E-mail : info@icomcanada.com Blacksole House, The Boulevard, Altira Business Park, Herne Bay, CT6 6GZ, UK Phone : +44 (01227) 741741...
  • Page 26 A-5351M-SU 6-9-16, Kamihigashi, Hirano-ku, Osaka, 547-0002, Japan © 1998 by Icom Inc.

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