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RTS DV2400 Service Manual

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CIRCUIT DESCRIPTION ............................ 1
PARTS LIST ............................................... 8
ADJUSTMENT ........................................ 28
PC BOARD..................................................30
SERVICE MANUAL
CONTENTS
SCHEMATIC DIAGRAM............................ 34
BLOCK DIAGRAM..................................... 38
SPECIFICATIONS...................................... 39
© 2016 Jan.

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Summary of Contents for RTS DV2400

  • Page 1: Table Of Contents

    SERVICE MANUAL © 2016 Jan. CONTENTS CIRCUIT DESCRIPTION ......1 SCHEMATIC DIAGRAM......34 PARTS LIST ..........8 BLOCK DIAGRAM........38 ADJUSTMENT ........28 SPECIFICATIONS........39 PC BOARD..........30...

  • Page 2: Circuit Description

    DV-2400 CIRCUIT DESCRIPTION Frequency configuration The receiver utilizes double conversion. The first IF is 38.850 MHz and the second IF is 450kHz. The first local oscillator signal is supplied from the PLL circuit. The PLL circuit in the transmitter generates the necessary frequencies. Fig. 1 shows the frequencies. 45 0KHz 1s t ANT SW...
  • Page 3 DV-2400 CIRCUIT DESCRIPTION First Mixer The signal from the RF amplifier is heterodyned with the first local oscillator signal from the PLL frequency synthesizer circuit at the first mixer (Q205) to create a 38.850MHz first intermediate frequency (1st IF) signal. The first IF signal is then fed through one pair of monolithic crystal filter (MCF : XF200 XF201) to further remove spurious signals.

  • Page 4: Squelch Circuit

    DV-2400 CIRCUIT DESCRIPTION Squelch Circuit The detection output from the FM IF IC (U200) passes through a noise amplifier (U201 2/2) to detect noise. A voltage is applied to the CPU (U2). The CPU controls squelch according to the voltage (SQIN) level.
  • Page 5 DV-2400 CIRCUIT DESCRIPTION high and Q104 turns on. Q102 turns on and a voltage is applied to (8T). The CPU in the control unit monitors the PLL (U205) LD signal directly. When the PLL is unlocked during transmission, the PLL LD signal goes low. The CPU detects this signal and makes the TXC signal low.
  • Page 6 DV-2400 CIRCUIT DESCRIPTION at the antenna end and to stabilize transmission output at voltage and temperature variations. (See Fig. Q208  and Q219 Q212 Q2 14 Q215 D214 ,D21 5 RF AM P DRIVE STAGE D202 DRIVE AMP FINAL AM P ANT SW POWER D2 28 ,D229 U2 02 VR2 00 U5 05...
  • Page 7 DV-2400 CIRCUIT DESCRIPTION P14~P17 P85~P86 Q6,Q7 KEY BACK LIGHT Fig. 12 Display circuit Encode DCS and CTCSS data is output through 42 PIN of CPU. The signal passes through low-pass CR filter, and the signal attained goes into the D/A converter (U505). The high speed data of DTMF/2T/5T Tone is output through 58 PIN of CPU, The signal passes through low-pass CR filter, providing TX and SP output audio frequency, and has processed IDC after amplified by a U504(B/4).
  • Page 8 DV-2400 CIRCUIT DESCRIPTION D/A Converter The D/A converter (U505) is used to adjust MO modulation, AF volume, TV voltage, FC reference voltage, and PC POWER CONTROL voltage level. Adjustment values are sent from the CPU as serial data. The D/A converter has a resolution of 256 and the following relationship is valid.

  • Page 9: Parts List

    DV-2400 PARTS LIST DISPLAY UNIT Ref. No Parts No. Description of item Size (LxW)(mm) Specification C1-C2 SMT CAPACITOR 0603 104±10% 50V SMT CAPACITOR 0603 102±10% 50V SMT CAPACITOR 0603 104±10% 50V SMT CAPACITOR 0603 102±10% 50V SMT CAPACITOR 0603 104±10% 50V C7-C20 SMT CAPACITOR 0603...
  • Page 10 DV-2400 PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification SMT CAPACITOR 0603 225±10% 50V SMT CAPACITOR 0603 104±10% 50V SMT CAPACITOR 0603 8P±0.1P 50V SMT CAPACITOR 0603 103±10% 50V ELECTRO 4×8 22uF25V ELECTRO 4×8 47uF/10V SMT TANTALUM CAPACITOR B type 22uF±20% 10V SMT RESISTOR...
  • Page 11 DV-2400 PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification SMT RESISTOR 0603 4.7K±5% SMT RESISTOR 0603 1.5K±5% SMT RESISTOR 0603 680R±5% SMT RESISTOR 0603 10K±5% SMT RESISTOR 0603 15K±5% SMT RESISTOR 0603 12K±5% SMT RESISTOR 0603 1.5K±5% SMT RESISTOR 0603...
  • Page 12 DV-2400 PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification LIGHTED DIODE POWER(YELLOW) LIGHTED DIODE RX(GREEN) SMT DIODE 0603 1SS400 SMT DIODE SC70 1SS372 SMT DIODE 0603 HSC277 SMT LIGHTED DIODE 0603 YELLOW LIGHTED DIODE TX(RED) D10-D13 SMT DIODE SOT-323 DA221...
  • Page 13 DV-2400 PARTS LIST MAIN UNIT Ref. No Parts No. Description of item Size (LxW)(mm) Specification C100-C104 SMT CAPACITOR 0603 103±10% 50V C105-C109 SMT CAPACITOR 0603 102±10% 50V C110-C111 SMT CAPACITOR 0603 104±10% 50V C112 SMT CAPACITOR 0603 102±10% 50V C113 SMT CAPACITOR 0603 NO USE...
  • Page 14 DV-2400 PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification C264 SMT CAPACITOR 0603 103±10% 50V C265-C268 SMT CAPACITOR 0603 104±10% 50V C269 SMT CAPACITOR 0603 47P±5% 50V C270-C271 SMT CAPACITOR 0603 180P±5% 50V C272-C274 SMT CAPACITOR 0603 100P±5% 50V C275...
  • Page 15 DV-2400 PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification C310 SMT CAPACITOR 0805 NO USE C311-C330 SMT CAPACITOR 0603 470P±10% 50V C331 SMT CAPACITOR 1206 470P±10% 50V C332 SMT CAPACITOR 0603 470P±10% 50V C333 SMT CAPACITOR 1210 470P±10% 50V C334...
  • Page 16 DV-2400 PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification C381 SMT CAPACITOR 0603 3.6P±0.1P 50V C382-C383 SMT CAPACITOR 0603 3P±0.1P 50V C384 SMT CAPACITOR 0603 NO USE C385-C386 SMT CAPACITOR 0603 3P±0.1P 50V C387 SMT CAPACITOR 0603 2P±0.1P 50V C388...
  • Page 17 DV-2400 PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification C527 SMT CAPACITOR 0603 82P±5% 50V C528-C530 SMT CAPACITOR 0603 NOUSE C531-C532 SMT CAPACITOR 0603 33P±5% 50V C533 SMT CAPACITOR 0603 680P±10% 50V C534-C535 SMT CAPACITOR 0805 474±10% 50V C536-C537 SMT CAPACITOR...
  • Page 18 DV-2400 PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification CF200 CERAMIC FILTER CFW450G CF201 CERAMIC FILTER CFW450E CV200 SMT CAPACITOR 1206 2P±0.25P 50V CV201 CERAMIC TRIMMER CAPVAR3 3-10P E100-E101 ELECTRO 10×15 470uF25V E102-E105 SMT TANTALUM CAPACITOR B type 22uF16V E200...
  • Page 19 DV-2400 PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification R102 SMT RESISTOR 0603 10K±5% R103 SMT RESISTOR 0603 3.3K±5% R104-R105 SMT RESISTOR 0603 47K±5% R106 SMT RESISTOR 0805 1K±5% R200-R201 SMT RESISTOR 0603 100R±5% R202 SMT RESISTOR 0603 NOUSE R203...
  • Page 20 DV-2400 PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification R252 SMT RESISTOR 2010 470R±5% R253-R254 SMT RESISTOR 0603 470R±5% R255-R260 SMT RESISTOR 0603 100K±5% R261 SMT RESISTOR 0603 82K±5% R262 SMT SMALL FIXED INDUCTOR 0603 22NH R263-R268 SMT RESISTOR 0603...
  • Page 21 DV-2400 PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification R319 SMT RESISTOR 0603 3.3K±5% R320 SMT RESISTOR 0603 4.7K±5% R321 SMT RESISTOR 0603 15K±5% R322 SMT RESISTOR 0603 30K±5% R323-R324 SMT RESISTOR 0805 820R±5% R325 SMT RESISTOR 1206 R326 SMT RESISTOR...
  • Page 22 DV-2400 PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification R351 SMT RESISTOR 0603 NO USE R352 SMT RESISTOR 0603 47K±5% R353 SMT RESISTOR 0603 5.6K±5% R500 SMT RESISTOR 0603 470R±5% R501 SMT RESISTOR 0603 2.7K±5% R502-R506 SMT RESISTOR 0603 10K±5%...
  • Page 23 DV-2400 PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification R548-R549 SMT RESISTOR 0603 2.2K±5% R550 SMT RESISTOR 0603 1.2K±5% R551 SMT RESISTOR 0603 3.9K±5% R552-R553 SMT RESISTOR 0603 1M±5% R554 SMT RESISTOR 0603 R555 SMT RESISTOR 0603 8.2K±5% R556-R559...
  • Page 24 DV-2400 PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification R581 SMT RESISTOR 0603 39K±5% R582 SMT RESISTOR 0603 680K±5% R583 SMT RESISTOR 0603 150K±5% R584 SMT RESISTOR 0603 6.8K±5% R585 SMT RESISTOR 0603 8.2K±5% R586 SMT RESISTOR 0603 47K±5% R587...
  • Page 25 DV-2400 PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification D230 SMT DIODE 0805 1SV214 D231 SMT DIODE 1210 JDP2S12CR D500 SMT DIODE SC-70 NOUSE D501 SMT DIODE SC-70 1SS372 D502 SMT DIODE SOT-416 DAN222 Q100 SMT TRANSISTOR SC-89 2SB1386 Q101...
  • Page 26 DV-2400 PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification Q220 SMT TRANSISTOR SOT-23 2SC1623 Q221 SMT TRANSISTOR SC-70 2SA1832(GR) Q222 SMT TRANSISTOR SC-70 2SC4738(GR) Q223 SMT TRANSISTOR EMT3 2SC4617 Q500 SMT DIGITAL TRANSISTOR EMT3 DTC144EE Q502 SMT TRANSISTOR SC-70 2SC4181...
  • Page 27 DV-2400 PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification L212-L213 SMT SMALL FIXED INDUCTOR 0603 27NH L214 SMT SMALL FIXED INDUCTOR 0603 18NH L215-L216 SMT WIRE WOUND INDUCTOR 0805 18NH L217-L218 SMT FERRITE BEAD (BLACK) 0805 L220-L221 SMT WIRE WOUND INDUCTOR 0805...
  • Page 28 DV-2400 PARTS LIST Ref. No Parts No. Description of item Size (LxW)(mm) Specification XF200-XF201 SMT CRYSTAL FILTER 38.5MHz Y200 CRYSTAL NO USE Y800 CRYSTAL NO USE VR200 SMT VARIOUS RESISTOR VER2×3 47K±5% SMT VARIOUS RESISTOR VER2×3 VR500 NO USE F100 SMT RESISTOR 1206...

  • Page 29: Adjustment

    DV-2400 ADJUSTMENT PCB Section Measurement Adjustment Specifications Item Condition Test equipment Terminal Parts Method /Remarks 1. Setting 1) Power supply voltage DC Power supply terminal : 13.8V 1) CH: TX high CV201 5.5 V ±0.2V 2. VCO lock Digital voltmeter voltage 2) CH: RX high CV200...
  • Page 30 DV-2400 ADJUSTMENT Transmitter section Measurement Adjustment Specifications Item Condition Test equipment Terminal Parts Method /Remarks ±3kHz (Wide) 9. 2-Tone CH : TX center (Wide/Narrow) ±150Hz Modulation Encoder ±1.5kHz (Narrow) deviation LPF:15kHz analyzer or linear ±100Hz Knob HPF:OFF detector 4) Transmit (LPF15kHz) ±3kHz (Wide) 10.

  • Page 31: Pc Board

    DV-2400 SCHEMATIC DIAGRAM POWER LED POWER(3AY2UD09) CE6275A50 Vout NOUSE 1K5(10K,YH291) 470R(3K,YH291) 102P 104P 22uF/25V 47uF/10V 103P 271T 271T 271T 680R(2K,YH291) RX(3AG2HD01) NOUSE 1SS400 103P 104P 103P NOUSE NOUSE 103P 102P NOUSE MICG YELLOW(587-589.5) MICI 220K 1K5(4K7,YH291) PASS DC SWITCH MICM DTC114EE YELLOW(587-589.5) DTC114EE...
  • Page 32 DV-2400 SCHEMATIC DIAGRAM L202 22NH FM RF AMP R233 C307 R269 C245 2P5(B) R222 220R R203 R200 C201 C211 R346 100R C251 D201 R231 C270 103P 100R(10R) R242 Q203 104P DAN235E C313 C315 C318 100R C226 DTA114YE C209 C308 471P 471P L209 471P...
  • Page 33 DV-2400 SCHEMATIC DIAGRAM R511 RX-IN C510 R541 102P DTM F-DET RX-OUT BUFFER AM P C520 R543 D500 R540 104P(J) NOUSE R508 NOUSE AUDIO/HPF C501 R573 C503 R526 103P R542 C529 634K-1% 103P R575 C564 FILT ER R586 RX-A 180K* NOUSE NOUSE NOUSE U501B...
  • Page 34 DV-2400 SCHEMATIC DIAGRAM P1 00 2S B1 386 SB E KIA78 08AF B L85 03-50 PSM F1 00 +8 V Vout C 105 C 106 C 100 C 101 MAIN+DC 13.8V 10 2P 10 2P 10 3P D100 E1 00 R 101 E1 01 10 3P...
  • Page 37 DV-2400 PC board views...
  • Page 38 DV-2400 PC board views...

  • Page 39: Block Diagram

    DV-2400 BLOCK DIAGRAM Q211 2SC4226 400‐470MHz D214, D215 Q221 Q214 D231 Q216 Q210 Q207 D202 Q208 Q219 Q212 Q215 2SA1832(GR) AFT05MS006NPB L407CDB 2SK508(K52) 2SC4226 2SC4226 DAN235E 2SC4226(R24) 2SC3356(R24) 2SK3078 MRF7042 CHARGE DRI VE FINAL PUM P BUFF T/R SW DRIVE ANT SW LOOP Q202 Q218...

  • Page 40: Specifications

    DV-2400 SPECIFICATIONS General Frequency Range 400~490MHz 400~490MHz Number of channels Channel Stepping 5, 6.25, 8.33, 10, 12.5, 20, 25, 30, 50KHz Antenna Impedance 50Ω Working temperature –20℃~+60℃ (–4℉~+140℉) Power Supply 13.8V DC±15% (11.7~15.8V) Grounding Method Negative ground Current Transmitter: about 9.5A Receiver: about 600mA(max.) Frequency Stability ±2.5ppm...