Galaxy DX 929 Service Manual
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Galaxy DX 929 Service Manual

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CB Radio
DX 929
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Summary of Contents for Galaxy DX 929

  • Page 1 CB Radio DX 929 Model  Service Manual Copyright Reserved...

  • Page 2: Table Of Contents

    TABLE OF DX 929 CONTENTS PAGE CHAPTER 1 SPECIFICATIONS General ..............

  • Page 3: Specifications

    CHAPTER 1 DX 929 SPECIFICATIONS 1.0 GENERAL Model DX 929 Channels Frequency Range 26.965 – 27.405 MHz Emission Modes Frequency Control Phase Lock Loop (PLL) synthesizer Frequency Tolerance 0.005 % Frequency Stability 0.001 % Operating Temperature Range -30°C to +50°C Dynamic PTT, 500 Ω...

  • Page 4: Operation

    DX 929 Figure 2-1 Front Panel 2.0 INTRODUCTION This section explains the basic operating procedures for the DX 929 mobile CB radio. 2.1 CONTROLS AND CONNECTIONS 2.1.1 FRONT PANEL Refer to the above Figure 2-1 for the location of the following controls.
  • Page 5 4. MIC GAIN CONTROL: Adjusts the microphone gain in the transmit and PA modes. This controls the gain to the extent that full talk power is available several inches away from the microphone. In the Public Address (PA) mode, the control functions as the volume control. 5.
  • Page 6 4. EXT SP.: This jack accepts a 4 to 8 ohm, 5-watt external speaker. When the external speaker is connected to this jack, the built-in speaker will be disabled. 5. F.C.: This jack is used to connect the optional Galaxy FC347 six-digit frequency counter. All connections, including DC power, are provided to the FC347 through this jack.
  • Page 7 2.1.3 FREQUENCY CHART CHANNEL CHANNEL FREQUENCY CHANNEL CHANNEL FREQUENCY (MHz) (MHz) 26.965 27.215 26.975 27.225 26.985 27.255 27.005 27.235 27.015 27.245 27.025 27.265 27.035 27.275 27.055 27.285 27.065 27.295 27.075 27.305 27.085 27.315 27.105 27.325 27.115 27.335 27.125 27.345 27.135 27.355 27.155 27.365...

  • Page 8: Microphone

    2.2 MICROPHONE The push-to-talk switch on the microphone controls the receiver and transmitter. Press the switch and the transmitter is activated, release switch to receive. When transmitting, hold the microphone two inches from your mouth and speak clearly in a normal voice. This transceiver comes complete with a low impedance dynamic microphone.

  • Page 9: Alternate Microphones And Installation

    2.4 ALTERNATE MICROPHONES AND INSTALLATION For best results, the user should select a low impedance dynamic type microphone or a transistorized microphone. Transistorized type microphones have a low output impedance characteristic. The microphones must be provided with a four-lead cable. The audio conductor and its shielded lead comprise two of the leads.

  • Page 10: Circuit Description

    DX 929 DESCRIPTION 3.0 INTRODUCTION This section explains the technical theory of operation for the DX 929 mobile CB radio. 3.1 PLL CIRCUIT The Phase Lock Loop (PLL) circuit is responsible for developing the receiver’s first local oscillator signal and the transmitter’s exciter signal. The PLL circuit consists primarily of IC2, IC3, Q25, Q29 and Q28.
  • Page 11 - 10 -...

  • Page 12: Alignment

    CHAPTER 4 DX 929 ALIGNMENT 4.0 REQUIRED TEST EQUIPMENT DC Power Supply (13.8VDC, 10A) Frequency Counter (100 MHz) RF Wattmeter (10W) RF Signal Generator (100 MHz) Multi-meter Automatic Distortion Meter Automatic Modulation Meter Oscilloscope (50 MHz) Audio Signal Generator Sinad Meter 4.1 ALIGNMENT PROCEDURES...
  • Page 13 4.1.2 TRANSMITTER ALIGNMENT ADJUST ITEM U.U.T. SETTING MEASUREMENT POINT TX Power Set radio to CH 19 AM TX mode. L40, L42, MAX > 12W Connect RF Power Meter to antenna jack. L43, L44 Balance Power Set SWR/MOD/PWR Switch to PWR. Between CH.
  • Page 14 Figure 4-1 Transmitter test setup Figure 4-2 Receiver test setup - 13 -...
  • Page 15 DX 929 MAIN PCB ADJUSTMENT LOCATION RF METER AM LOW POWER AM HI POWER AM LOW POWER AM MOD AM MOD METER AM S-METER 10.240 MHz ADJUST AM SQUELCH - 14 -...

  • Page 16: Maintenance

    CHAPTER 5 DX 929 MAINTENANCE 5.0 PRECAUTIONS The inherent quality of the solid-state components used in this transceiver will provide many years of continuous use. Taking the following precautions will prevent damage to the transceiver. (i) Never key the transmitter unless an antenna or suitable dummy load is connected to the antenna receptacle.
  • Page 17 CHAPTER 6 DIAGRAMS & DX 929 PARTS LIST 6.0 GENERAL Information on most electrical and mechanical parts is included in the parts list. The reference designators are in alphanumeric order. - 16 -...
  • Page 18 DX 929 ROTARY SWITCH PCB (EPT092920Z) (SMD-COPPER SIDE) ( COMPONENT SIDE ) - 17 -...
  • Page 19 PART LIST: DX 929 ROTARY SW. P.C.B REFERENCE RANGER PART ITEM DESCRIPTION NUMBER NUMBER EPT092920Z ROTARY SW PCB CHIP/F/R 0.0 Ω 0.1W R207,R210,R218,R219 RCY010004Z CHIP/F/R 330 Ω 0.1W R201 RCY013314Z R202,R203,R204,R205, CHIP/F/R 680 Ω 0.1W RCY016814Z R206 CHIP/F/R 4.7K Ω 0.1W...
  • Page 20 DX 929 DISPLAY PCB (EPT092930Z) ( COMPONENT SIDE ) ( COMPONENT SIDE ) ( COPPER SIDE ) - 19 -...
  • Page 21 PART LIST: DX 929 DISPLAY P.C.B REFERENCE RANGER PART ITEM DESCRIPTION NUMBER NUMBER EPT092930Z DISPLAY PCB CHIP/F/R 680 Ω 0.1W R301,R302,R303,R304, RCY016814Z R305,R306 CHIP/F/R 1K Ω 0.1W R308 RCY011024Z CHIP/F/R 2.2K Ω 0.1W R310 RCY012224Z CHIP/F/R 22K Ω 0.1W R309...
  • Page 22 DX 929 (POWER/MIC GAIN/VOL-SQ CONTROL) VR PCB (EPT092940Z) ( COMPONENT SIDE ) ( COPPER SIDE ) - 21 -...
  • Page 23 PART LIST: DX 929 POWER/MIC GAIN/VOL-SQ CONTROL, VR P.C.B REFERENCE RANGER PART ITEM DESCRIPTION NUMBER NUMBER EPT092940Z VR PCB CHIP/F/R 0.0 Ω 0.1W SH3027 RCY010004Z CHIP/F/R 10K Ω 0.1W R401 RCY011034Z C401,C402 CK1102AB5X CHIP/C .001uF 50VW C403,C404 CK1103AB5X CHIP/C .01uF 50VW...
  • Page 24 DX 929 (RF GAIN/DIMMER CONTROL) VR PCB (EPT092950Z) ( COMPONENT SIDE ) ( COPPER SIDE ) PART LIST: DX 929 RF GAIN/DIMMER CONTROL, VR P.C.B REFERENCE RANGER PART ITEM DESCRIPTION NUMBER NUMBER EPT092950Z TB PCB VR501 (DIMMER) RV50203525 VR 5KB...
  • Page 25 DX929 METER PCB (EPT092961Z) ( COMPONENT SIDE ) ( COPPER SIDE ) ( COPPER SIDE-SMD ) - 24 -...
  • Page 26 PART LIST: DX 929 METER PCB (Dimmer Circuit) REFERENCE RANGER PART ITEM DESCRIPTION NUMBER NUMBER EPT092961Z METER PCB CHIP/F/R 15 Ω 0.1W R603 RCY011504Z CHIP/F/R 47 Ω 1/4W R606,R607 RCY144704Z R610 RCY011024Z CHIP/F/R 1KΩ 0.1W R605 RCY013324Z CHIP/F/R 3.3KΩ 0.1W...
  • Page 27 DX929 ANTENNA PCB (EPT360042Z) (COPPER SIDE-SMD ) ( COPPER SIDE ) ( COMPONENT SIDE ) PART LIST: DX 919 ANT P.C.B REFERENCE RANGER PART ITEM DESCRIPTION NUMBER NUMBER EPT360042Z ANT P.C.B RCY010004Z 0 OHM 0.1W RCY014714Z 470 OHM 0.1W R3,R4 RCY011014Z 100 OHM 0.1W RCY013314Z...
  • Page 28 DX 929 MAIN PCB (EPT092913Z) ( COMPONENTS SIDE ) - 27 -...
  • Page 29 DX 929 MAIN PCB (EPT092913Z) ( COPPER SIDE ) - 28 -...
  • Page 30 PART LIST DX 929 MAIN PCB REFERENCE RANGER DESCRIPTION CC0505615L 560PF 50WV NUMBER PART NO. C52,197 CC0500101A 1PF 50WV C225 CC0500201A 2PF 50WV EPT092913Z MAIN PCB C218 CC0500301A 3PF 50WV 0 Ω 1/16W R19,305,258(B239) RCP160004Z C61,62,90 CC0500501A 5PF 50WV 10 Ω 1/16W...
  • Page 31 C37,175,38 CE0254767Z 47UF 25WV VR16,18 RE10200041 S/F/R 1K C156,238,293,107 CE0161077Z 100UF 16WV VM6CK C252 CE0162277Z 220UF 16WV VR14 RE50200042 S/F/R 5K VM6CK C152,179 CE0163377Z 330UF 16WV VR1,15 RE10300031 S/F/R 10K CE0104777Z 470UF 10WV VM6CK C243,248 CE0251087Z 1000UF 25WV RE10400043 S/F/R 100K CEM254767Z 47UF 25WV VM6CK...
  • Page 32 DX 929 SCHEMATIC DIAGRAM (CONTROL PCB)
  • Page 33 DX 929 SCHEMATIC DIAGRAM (MAIN PCB)
  • Page 34 DX 929 EXPLODE DRAWING DX 929 MECHANICAL PART...
  • Page 35 UPDATES & CORRECTIONS Any updates or corrections to this Service Manual will be included in the Tech Support section of our website at www.GalaxyRadios.com.
  • Page 36 Two Year Warranty This new Galaxy radio is covered by a two year limited warranty. Here are the details. • All of our Galaxy radio model numbers begin with the letters “DX” and are covered by our Limited Two Year Parts and Labor Warranty.
  • Page 37 ATS929010A July, 2003...

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Dx 919

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