DNT XLP77 Service Manual
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DNT XLP77 Service Manual

DNT XLP77 Service Manual

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Summary of Contents for DNT XLP77

  • Page 1: Block Diagram

    XLP77...

  • Page 2: Table Of Contents

    – – – Contents Pages Specifications ………………………………………………………………………………………….2 Block Diagram …………………………………………………………………………………………3 Schematic Diagram ………………………………………………………………………………….4~5 Channel Frequency Charts …………………………………………………………………………6~7 Printed Circuit Board …………………………………………………………………………………8~9 Alignment and Adjustment ……………………………………………………………………………10 Test Equipment set-up and Alignment Instructions ……………………………………………11~14 Trouble Shooting ………………………………………………………………………………………15 Parts List ……………………………………………………………………………………………16~21 Semiconductor Voltage Chart …………………………………………………………………….22~24 SPECIFICATIONS STANDARD TEST CONDITIONS Supply Voltage - Battery …………………………..…………………...….……………………………………….

  • Page 3: Specifications

    GENERAL SPECIFICATIONS Transmitter……………………………………..………………….…….……………...…..CPU Controlled PLL Synthesizer Receiver…………………………………..……...……….CPU Controlled double conversion, super-heterodyne system Intermediate Frequency ………………………….……………………………………………………………….. 21.7 MHz …… ……… …… …… …… ……… …… ….… …… …… … ……… …… …… …… 45 0 KH z Operating Frequencies PMR…………………….….……………...……………………….… 446.00625MHz ~ 446.09375 MHz LPD…………………………………………………………………..433.07500 MHz ~ 433.77500 MHz Frequenc y Stability……………………………………………………………..………………...……………………0.0005% Battery Life……………………………...………………………………………………………………….…30 hours (typical)

  • Page 4: Channel Frequency Charts

    CTCSS Tone Frequency Chart FREQ.(Hz) FREQ. (Hz) FREQ. (Hz) 67.0 107.2 167.9 71.9 110.9 186.2 74.4 114.8 179.9 77.0 118.8 186.2 79.7 123.0 192.8 82.5 127.3 203.5 85.4 131.8 210.7 88.5 136.5 218.1 91.5 141.3 225.7 94.8 146.2 233.6 97.4 151.4 241.8 100.0...
  • Page 5 4 3 3 . 5 5 0 0 0 4 3 4 . 4 2 5 0 0 4 3 3 . 5 7 5 0 0 4 3 4 . 4 5 0 0 0 4 3 3 . 6 0 0 0 0 4 3 4 .

  • Page 6: Printed Circuit Board

    PRINTED CIRCUIT BOARD TOP VIEW...
  • Page 7 PRINTED CIRCUIT BOARD BOTTOM VIEW...

  • Page 8: Alignment And Adjustment

    ALIGNMENT AND ADJUSTMENT TRANSMITTER A. Power Supply Voltage 6.0VDC B. Frequency Setting 1. Connect a frequency counter or Communications Service Monitor to the antenna connector through an RF power attenuator (5.0 watts min. rating, 20 dB min. attenuation). 2. Depress the PTT switch. 3.

  • Page 9: Test Equipment Setup And Alignment Instructions

    TEST EQUIPMENT SETUP AND ALIGNMENT INSTRUCTIONS ALIGNMENT PROCEDURE Step Setting Connection Adjuster Adjust for RX VCO voltage adjustment DC voltmeter to VCO L302 0.7~3.5 V DC Channel PMR: (P1) 446.00625 MHz Test point (Figure 1) LPD: (69) 434.775 MHz Mic : Receive Volume : Optional Squelch : On TX VCO voltage adjustment...
  • Page 10 TRANSMITTER SECTION A. Test Equipment Required • RF power meter (RF SSVM) • DC power supply • 50 ohms dummy load (non-inductive) • Spectrum analyzer • RF attenuator (50 ohms non-inductive) • Frequency counter • Oscilloscope • Coupler • Audio generator •...
  • Page 11 2. Adjust Deviation Step Setting Connection Adjuster Adjust for -Connection the audio generator RV701 * For PMR: AF Modulation adjustment Channel (set to 1 KHz)to the microphone 2.3 ~ 2.5KHz PMR: (P1) 446.00625 MHz jack. Normal Adjust: LPD: (69) 434.775 MHz -Connect the modulation meter 2.5KHz Mic : Transmit...
  • Page 12 RECEIVER SECTION A. Test Equipment Required • Standard signal generator (SSG) • DC power supply • AC level meter • 12 dB SINAD Meter • Distortion meter B. Alignment Procedure Step Setting Connection Adjuster Adjust for RX SINAD Maximum PMR: (P1) 446.00625 MHz sensitivity LPD: (69) 434.775 MHz indication on...

  • Page 13: Trouble Shooting

    TROUBLE SHOOTING Symptom Probable Cause Remedy • Defective regulator IC901.. • Replace • Defective components of X801. • Replace defective Unit does not work at all component(s) • Broken DC power terminal. • Replace • Defective external speaker line. • Repair or replace •...

  • Page 14: Parts List

    PARTS LIST LEVEL PART NO NAME & DESCRIPTION Q'TY REFERENCE NO UPPER COVER ASS'Y 420-36N-H8 SPK NR-03606NB-A2409 SPK201 290-281-E4 LCD STD-DT013-HP-0 (28.4X21.4X2.8mm) LCD801 711-001 UPPER COVER ABS GRAY+INSERT 1EA 711-003 BEZEL ABS BLACK 811-002 PTT BUTTON SILICONE RUBBER 811-004 LED CAP SILICONE RUBBER CLEAR 941-001 FELT(SPK)
  • Page 15 PARTS LIST LEVEL PART NO NAME & DESCRIPTION Q'TY REFERENCE NO 020-101-00 CHIP RESISTOR 1/16W 5% J 1608 R103.534 020-102-00 CHIP RESISTOR 1/16W 5% J 1608 R124.135.502.527.705.734.751.914 R137.140.142.306.309.312.313.314.351. 020-103-00 CHIP RESISTOR 1/16W 5% J 1608 353.713.741.817.858 R308.526.528.551.712.735.802.803.804. 020-104-00 CHIP RESISTOR 100K 1/16W 5% J 1608 812.815...
  • Page 16 PARTS LIST LEVEL PART NO NAME & DESCRIPTION Q'TY REFERENCE NO 020-474-00 CHIP RESISTOR 470K 1/16W 5% J 1608 R507.522.535.714.733 020-562-00 CHIP RESISTOR 5.6K 1/16W 5% J 1608 R602.706 020-563-00 CHIP RESISTOR 1/16W 5% J 1608 R126.816 020-564-00 CHIP RESISTOR 560K 1/16W 5% J 1608 R715...
  • Page 17 PARTS LIST LEVEL PART NO NAME & DESCRIPTION Q'TY REFERENCE NO 110-050-00 CHIP CERAMIC CL05C050CBNC C617 110-561-00 CHIP CERAMIC CL05B561KBNC 560PF C503.507.722 110-060-00 CHIP CERAMIC CL05C060CBNC C109.309.315.319.600.614.615 110-070-00 CHIP CERAMIC CL05C060CBNC C603 110-080-00 CHIP CERAMIC CL05C080CBNC C111.318.601 C313.325.329.502.619.702.726.728.733.734 110-102-00 CHIP CERAMIC CL05B102KBNC 0.001UF .806...
  • Page 18 PARTS LIST LEVEL PART NO NAME & DESCRIPTION Q'TY REFERENCE NO 233-412-30 CHIP TR KRC412 Q704 201-154-00 CHIP DIODE KDV154 D300.301 201-114-00 CHIP DIODE KDS115 D101.103.107.501 201-200-00 CHIP DIODE KDS120 D102.105.106 201-201-00 CHIP DIODE KDS121 D701.702.703 201-193-00 CHIP DIODE KDS114 D302.305.601.602 250-112-00 IC R1120N401B...
  • Page 19 PARTS LIST LEVEL PART NO NAME & DESCRIPTION Q'TY REFERENCE NO 261-400-10 CRYSTAL 4.0MHz 30ppm C/L:20pF HC-49S H=2.5mm X801 128-050-10 Condenser Mic EM-05FP 9.7X6.5mm(-36dB +/-2dB) MIC701 440-2R5-10 MIC JACK SKJS-2511S NOR JACK701 440-3R5-10 SPEAKER JACK SKJS-3511S NOR JACK702 425-111-02 TACT SW SKTS-1102VSA SW701.SW702 280-450-21 CERAMIC FILTER LTM 450FW...

  • Page 20: Semiconductor Voltage Chart

    SEMICONDUCTOR VOLTAGE CHART 1. IC’s IC NO. PIN NO IC NO PIN NO IC NO PIN NO IC801 (TMP87CH21DF) IC801 IC801 (TMP87 (TMP87 CH21DF) CH21DF) IC901 R1120N 400B IC101 DBL5018...
  • Page 21 SEMICONDUCTOR VOLTAGE CHART IC NO. PIN NO IC NO PIN NO IC NO PIN NO U504 LM324 IC301 TB3120FN IC101 DBL5018 LM324 U502 LM358 U504 U503 LM324 LM386 IC301 TB3120FN...
  • Page 22 SEMICONDUCTOR VOLTAGE CHART 2. Transistor Receiver Transceiver PIN NO Q101 Q102 Q103 Q105 Receiver Transceiver PIN NO Q106 Q300 Q301 Q302 Q303 Q304 Q501 Q502 Q503 Q504 Q505 Q507 Q508 Q601 Q602 Q604 Q605 Q606 Q607 Q701 Q702 Q703 Q704 Q751 Q901 Q902...
  • Page 23 SEMICONDUCTOR LEAD ASSIGNMENT AND BLOCK DIAGRAM DIODEs KDV154 VHF,UHF Tuner AFC VCO for UHF BAND Radio KDS114 VHF Tuner BAND Switch Applications KDS115 VHF Tuner BAND Switch Applications KDS120 Ultra High Speed Switching Application KDS121 Ultra High Speed Switching Application...
  • Page 24 TRANSISTORs 2SC4901YK UHF / VHF Wide Band Amplifier KTC4075 Switching Application KTC3880S High Frequency Low Noise Amplifier.VHF Band Amplifier KTA2014 Switching application KRA226 High Current Switching Application. Interface Circuit and Driver Circuit Application. KRA305 Switching Application. Interface Circuit and Driver Circuit Application. KRC404 Switching Application.
  • Page 25 LM386MX-1 Equivalent Schematic and Configuration Diagram...
  • Page 26 LM324MX...
  • Page 28 LM358MX...
  • Page 29 TMP87CM21CDF Pin assignments (top view)
  • Page 30 Block Diagram AT24C02N-10SC-2.7...
  • Page 31 TB31202FN...
  • Page 32 R1120N401B...
  • Page 33 EXPLODED VIEW...
  • Page 34 EXPLODED VIEW PARTS LIST...

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