Factory Service Manual
Contents
1. 295 AKER i sp 11515 O NB ANL 9 ci 39P RI 5 R26 D107 8 100K D97 14148 VRI ves D89 100K 14148 Ri 5 S 560P MAIC 131 18365 cise 014750 88 7 c210 250969 D 197 P CH 142 212440 18001 ci z 85 103 Sejo cess 5501 POWER Sw T 5200 3P CH AUTO SWR 47P CH J20 194 150P CH RANGER ELECTRONIC COMMUNICATIONS INC 104 473 MODEL DX 929 Cesi 473 KI ceeo 0929107 TITLE SCHEMATIC DIAGRAM APPROVED CHECKED MAR 7 2003 ZM LU DRAWER 919 EXPLODE DRAWING DX 919 MECHANICAL PART NO NUMBER PART NAME QTY 1 FRONT PAH2. 0202 DISPLAY PCB 4 main pcb G VR PCB EPTO92940Z xxx MRGTC S C403 103 DUH 8v nb TBI lt 19 o 0203 RNI403 GND 7 ROTARYSW EPTO92920Z METER 0929607 1601 470uH main pcb 0 gt 2 1 3 5 2 IB 2 5 GN 9 1206 ki 77 77 77 777 771 777 777 777 777 777 TO E p o gt e 2 Y ols S s 915 KD KD 777 777 777 7 TT TT T
3. gt C z Du COMPONENTS SIDE 27 zena Mon sloni TNA nei SINE E VEE za Ura kp PART LIST DX 919 MAIN PCB REFERENCE RANGER DESCRIPTION NUMBER PART NO EPT092913Z MAIN PCB R19 305 258 B239 RCP160004Z 0 1 16W R246 RCP161004Z 10 Q 1 16W R267 241 B236 RCP161504Z 150 Q 1 16W R133 213 253 282 RCP164704Z 47 1 16W R130 215 220 249 RCP165604Z 56 Q 1 16W RCP166804Z 68 Q 1 16W R5 8 30 33 76 81 174 260 RCP161014Z 100 Q 1 16W R32 245 B236 RCP161514Z 150 Q 1 16W R23 RCP161814Z 180 Q 1 16W R140 163 177 259 B239 RCP162214Z 220 Q 1 16W 1 1627147 270 Q 1 16W R6 10 16 24 248 254 300 RCP163314Z 330 Q 1 16W R188 268 293 RCP164714Z 470 1 16W R266 RCP165614Z 560 Q 1 16W R4 50 209 89 RCP166814Z 680 Q 1 16W R74 RCP168214Z 820 1 16W R62 64 67 72 115 116 118 RCP161024Z IK O 1 16W 122 123 136 138 160 164 179 186 189 205 206 214 303 232 237 261 269 291 292 295 320 VR12 B236 R192 RCP161224Z 1 2K Q 1 16W R132 207 233 247 RCP161524Z 1 5K Q 1 16W 255 273 79 80 R226 RCP161824Z 1 8K 1 16W R20 27 71 75 134 RCP162224Z 2 2K 1 16W 162 283 313 R9 25 28 121 RCP162724Z 2 7K 1 16W R18 22 66 73 128 RCP163324Z 3 3K 1 16W 191 219 274 R52 57 RCP163924Z 3 9 O 1
4. 11 11 4 1 Alignment Procedures hee 11 5 MAINTENANCE 5 0 bw eine dae Bp ee aga ee BS 15 5 1 PeriodicInspection bidet ek awe Wee ey ee 15 5 2 Fuse Replacement sty gad elas Se A tee a Qe SA ha 15 CHAPTER 6 DIAGRAMS AND PARTS LIST 6 0 PCB Eayout amp Parts Lists ish beets Ged hie oe etd pads 16 1 919 SPECIFICATIONS HE Z TOV Ne 1 0 GENERAL Model DX 919 Channels 40 Freguency Range 26 965 27 405 MHz Emission Modes AM Freguency Control Phase Lock Loop PLL synthesizer Freguency Tolerance 0 005 Freguency Stability 0 001 Operating Temperature Range 30 to 50 Microphone Dynamic PTT 500 0 Input Voltage 13 8V DC Antenna Connector UHF SO239 Dimensions 7 1 4 W x 9 D x 2 1 4 H Weight 3 4 165 1 1 TRANSMITTER RF Power Output AM 4 watts RF Transmit Modes AM Modulation High and Low level Class B Amplitude Modulation Spurious Emissions 60dB Carrier Suppression 60dB Audio Frequency Response 300 to 2500 Hz Antenna Impedance 50 Ohms Output Indicators Meter shows incoming signal strength RF output power SWR and AM Modulation level Transmit LED glows red when transmitter is in operation 1 2 RECEIVER Sensitivity For 10dB S N lt 0 5uV IF Freguency AM 10 695 M
5. 4 1 2 TRANSMITTER ALIGNMENT ADJUST ITEM U U T SETTING POINT MEASUREMENT Set radio to CH 19 AM TX mode 140 142 MAX gt 12W Connect RF Power Meter to antenna jack Set L43 L44 Balance Power SWR MOD PWR Switch to PWR Between CH 1 40 AM TX Set radio to CH 19 AM TX mode High Power Set modulation to off 3 8 W Set RF POWER fully clockwise AM TX Set POWER fully counterclockwise 0 3W 0 2W Low Power RF Power Set radio to CH 19 AM TX mode For a needle reading Meter Set RF POWER fully clockwise of 4 on TX PWR Set SWR MOD PWR Switch to PWR scale position AM TX Set radio to CH 19 AM TX mode For a needle reading Modulation AF signal 30mV 1 KHz to microphone of 90 on the Set MIC Gain fully clockwise external modulation Set SWR MOD PWR Switch to MOD position meter AM Modulation Set radio to CH 19 AM TX mode For a needle reading Meter AF signal 30mV 1 KHz to microphone of 90 on the Set MIC Gain fully clockwise modulation scale 4 1 3 RECEIVER ALIGNMENT AM Sensitivity Set radio to CH 19 AM RX mode Set RF GAIN fully clockwise Set SQ fully counter clockwise Set VOL Control at 2 o clock Connect SG to antenna jack Freguency 27 185 MHz luV Mod 30 Set radio to CH 40 AM RX mode RE SG setting 27 405 MHz For Balance Between Set radio to CH 1 AM RX mode CH CH 40 RE SG setting 26 965 MHz Set radio to CH 19 AM RX mode RE SG setting 27 205 MHz DC Voltage to max 100u
6. 0110347 10 OHM 0 1W C7 1059 1 0 5 50WV C6 50WV C3 C4 CK2104AB7R 0 1uF 25WV C1 C2 CK1103AB7L 0 001uF 50WV Ql TY2SC2712G TR 2SC2712GR D3 EDSS00355Y DIODE 155355 D1 D2 EDHM0198SY DIODE 5 1985 D4 EDMA0028TY DIODE MA28T LI ECRFZ10053 C3RH0610 VRI RE10300009 S F R 10K OHM WX01070715 26 JUMPER WIRE 919 MAIN PCB EPT092913Z Ce37 J K RS RANGER Z gt 929137 JPet jo gla 4 81 1 JP14 MiC OPRI Oz
7. CHIP F R 15 0 0 1W 606 607 1447047 CHIP F R 47 1 4W R605 RCY013324Z CHIP F R 3 3KQ 0 1W R604 0110347 10KQ 0 1W R601 RCY011234Z CHIP F R 12KQ 0 1W R602 RCY014734Z CHIP F R 47KQ 0 1W C602 C609 C613 C614 C615 616 CK1103AB5X CHIP C 0 01uF 50WV C601 C607 C608 C610 C612 CK1104AB5X CHIP C 0 1uF SOWV C605 C611 5475 7 4 7 16WV C603 C606 CEY254767Z E C 47uF 25WV C604 CEY251077Z E C 100uF 25WV Q601 Q602 TY2SC2712G T R 2SC2712GR TE85L Q603 TYDTC124EA T R DTCI24EUATI06 L601 YCTLI4774E CHOKE COIL 470uH LAMP EX02N40230 LAMP 0 05 12V J603 EX07N48223 PCB CONN S 2 PIN J601 EX07N48350 PCB CONN S 3 PIN J602 EX07N48222 PCB CONN S 5 PIN 919 ANTENNA PCB EPT360042Z COPPER SIDE SMD PART LIST DX 919 ANT P C B REFERENCE NUMBER COPPER SIDE NUMBER EPT360042Z RANGER PART 5 DESCRIPTION ANT P C B R9 RCY010004Z 0 OHM 0 1W RI RCY014714Z 470 OHM 0 1W R3 R4 RCY011014Z 100 OHM 0 1W R2 RCY013314Z 330 OHM 0 1W R5 R11 0110247 OHM 0 1W 10 12 RCY012224Z 2 2K OHM 0 1W 1 JA Nn R O 59 R7 C5
8. TR RN1403 TE85L Q205 TYZRN2403Z RN2403 TE85L J201 J206 EX07N48223 PCB CONN S 2 PIN J203 EX07N48350 PCB CONN S 3 PIN J202 EX07N48222 PCB CONN S 5 PIN J204 EX07N48209 PCB CONN S 10 PIN ROTARY SW EWRT32059S ROTARY SW GPS 0668 J205 RCP160004Z 18 C F R 0 0 Q 1 16W 919 DISPLAY EPT092930Z 4 _ 966665 8 timi e PART LIST DX 919 DISPLAY P C B REFERENCE NUMBER RANGER PART NUMBER 0929307 DESCRIPTION DISPLAY PCB R301 R302 R303 R304 R305 R306 RCY016814Z CHIP F R 680 2 0 1W R308 0110247 CHIP F R IK 0 1W R310 RCY012224Z CHIP F R 2 2K 0 1W R309 0122347 CHIP F R 22K Q 0 1W D301 D302 EDSS00355Y DIODE 155355 LED201 LED202 EX01Y40114 LED LAMPS KM 23ESGC DISPLAY EX03N40419 LED DISPLAY TX 566 HI OFF LO NB CB PA SWR MOD PWR EWSL31027K 20 SLIDE SW 3N 919 POWER MIC GAIN VOL SQ CONTROL VR PCB 0929407 ee o o COMPONENT SIDE COPPER SIDE 21 PART LIST DX 919 POWER MIC GAIN VOL SO CONTROL VR P C B REFERENCE NUMBER RANGER PART NUMBER EPT092940Z DESCRIPTION VR PCB SH3027 RCY010004Z CHIP F R 0 0 0 1W R401 0110347 CHIP F R 10
9. This switch controls the function of the meter during the transmit mode In SWR position the meter indicates the Standing Wave Ratio SWR of your antenna There are no adjustments because the SWR circuit in this radio calibrates itself automatically When the switch is in the MOD position the green scale on the meter indicates your percentage of modulation in the AM mode only They are most accurate when testing at maximum power output When this switch is in PWR position the meter indicates your power output 12 NB ANL CB PA SWITCH When the switch is in the NB ANL position the Noise Blanker NB and Automatic Noise Limiter ANL circuits are activated The Noise Blanker is very effective in eliminating repetitive impulse noise such as ignition interference In the CB position the PA function is disabled and the radio will transmit and receive on the speaker that is connected In the PA position the radio acts as public address amplifier Your voice will come out of the speaker that is plugged into the PA SP jack on the rear panel The radio does not operate when you are in the PA mode 13 TALKBACK SWITCH This feature is used to monitor your own voice For example you could use this feature to compare different microphones HI is high volume LO is low volume The Talkback circuit is off when the switch is in the OFF position 14 RX TX LED This LED is green during receive and red during transmit 15 CHANNEL DISPL
10. 16W R26 165 190 195 196 131 RCP164724Z O 1 16W R264 265 RCP165624Z 5 6K 1 16W R14 40 41 70 82 312 RCP166824Z 6 8K 1 16W R275 RCP168224Z 8 2K O 1 16W R1 13 17 65 68 159 161 175 RCP161034Z 10K O 1 16W 181 202 210 216 227 231 272 276 296 297 262 R178 310 RCP161234Z 12K Q 116 RI80 RCP161534Z 15 Q 1 16W R187 208 RCP162234Z 22K 1 16W R2 309 311 RCP163334Z 33K 1 16W R46 RCP163934Z 39K O 1 16W R7 29 61 63 185 218 126 157 RCP164734Z ATK 1 16W 222 224 R21 105 107 RCP166834Z 68K 1 16W R45 RCP168234Z 82K 1 16W R12 42 43 44 51 53 104 108 RCP161044Z 100K 1 16W 112 182 184 221 225 278 R47 117 135 139 194 RCP162244Z 220K 1 16W R49 55 176 RCP162744Z 270K 1 16W 15 111 183 RCP164744Z 470K 1 16W R48 RCP168244Z 820K 1 16W R106 RCP161054Z IMO 1 16W R193 RCP161554Z 1 5M 1 16W R124 RCP161064Z 10M 1 16W R244 B236 RCP141514Z 150 1 4W R239 RCP121034Z 10K O 1 2W C8 CC0508204L 82PF 50WV C4 CC0501015L 100PE 50WV C137 CC0501515L 150 50WV C31 136 CC0502715L 270PE 50 C11 14 CC0503315L 330PE 50 29 23 CC0505615L 560PE 50 C52 197 0500101 IPF 50WV C225 CC0500201A 2PF 50WV C218 CC0500301A 50WV C61 62 90 0500501 SPE 50WV C108 1 49 CC0501004A 10PE 50WV C84 89 0501504 15 50WV C43 CC0501804A 18 50WV C
11. 8 T 174 100 7 4 FREGI REQUENCY 5 gt 10u25v J10 MICROPHONE g cse 103 77 07 COUNTER yee Ice 29 GIJA TIA 68P CH 270P UJ 02 300 Sul6V T Me JOK K 2 9 1 2313 m RNA RIJS RF GAIN GN 8 117 o 5P CH R222 oy 28 9307 0929207 2 2541282 8807 1K5 214 1K AM H D82 C116 6 27 935 256945 Ik Ri glo 20P UJ 5 668 ROTARY 7 J28 t selo SN R157 47K 4 41 5 06 8181818 103 s 5
12. 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 2 3 OPERATION 2 3 1 PROCEDURE TO RECEIVE 1 Be sure that the power source microphone and antenna are connected to the proper connectors before going to the next step 2 Turn VOL knob clockwise to apply power to the radio 3 Set the VOL to a comfortable listening level 4 Set the MODE switch to the desired mode 5 Listen to the background noise from the speaker Turn the SOUELCH knob slowly clockwise until the noise just disappears The SOUELCH is now properly adjusted The receiver will remain guiet until a signal is actually received Do not advance the control too far or some of weaker signals will not be heard 6 Set the CHANNEL selector switch to the desired channel 7 Set the RF GAIN control fully clockwise for maximum RF gain 2 3 2 PROCEDURE TO TRANSMIT 1 Select the desired channel of transmission 2 Set the MIC GAIN control fully clockwise 3 If the channel is clear depress the push to talk switch on the microphone and speak in a normal voice 2 4 ALTERNATE MICROPHONES AND INSTALLATION For best results the user should select a low impedance dynamic type microphone or a transistorized microphone Transistorized t
13. 018 9 EMOJ00310Z F E TJ310 D3 5 7 9 10 13 14 20 21 27 41487 14148 96 33 35 37 53 60 65 69 75 81 88 89 102 106 107 141 150 97 82 155 85 95 115 114 90 B236 92 B236 93 B236 21 2 11 12 30 31 ED1N00060P IN60P D110 ED1N04003Z 1N4003 D109 ED1N04007Z 1N4007 D16 17 EDSS00053Z 15553 259 72 EDMA00027W MA27W A D71 145 156 EDMA00027T 27 D70 EDZDO05519Z 541 05 D73 EDZDO05759Z 7 5 0 5W 12 3 ECIFT12002 7MC 7172ABW L6 12290 LET L20 12012 LET 113CN 6514X 123 ECIFT12016 LET 113CN 6344Z LI ECIFT12252 144 ECIFT12255 19 10 ECIFT12256 LET 115 12258 140 12262 LET 114 12263 LET 143 239 ECIFT12265 LET 306 PIN4 amp 6 B239 CKI820AA4A 82PE50WV L7 42 12253 LET L5 12440 LET L8 12492 LET L48 ECCHK16096 4700 L503 16000 0 47UH TI ECCHK16004 11 19 L33 37 ECCHK16070 220 147 ECCHK16176 4 116 ECCHK16246 220 L30 ECSPG18003 SPRING COIL L29 28 B236 ECSPG18075 SPRING COIL 131 ECSPG18365 SPRING COIL L35 ECSPG18001 SPRING COIL 138 ECREZ10048 25 UH 139 ECBAD18506 BEAD COIL 141 13 ECBAD18526 BEAD COIL 30 16 18 RE10200041 S F R 1K VM6CK VRI4 50200042 S F R SK VM6CK 15 RE10300031 S F R 10K VM6CK VR9 RE10400043 S E R 100K V
14. 0WV C34 CM0504735Z 0 0470 50WV C12 CM0502225Z 0 00220 50 198 CE0501047Z 0 1UF 50WV C10 CE0504747Z 0 47UF 50WV C67 75 153 157 170 186 187 CE0501057Z 5 159 214 CE0502257Z 2 2UF 50WV C103 182 CE0504757Z 4 TUF 50WV C13 21 22 44 82 115 158 275 CE0251067Z 10UF 25WV 276 239 1 03820047 TRIMMER C 20P CV38D2001 C80 181 CE0252267Z 220 25WV C37 175 38 CE0254767Z 4TUF 25WV C156 238 293 107 01610772 100UF 16WV C252 CE0162277Z 220UF 16WV 152 179 CE0163377Z 330UF 16WV C91 CE0104777Z 470UF 10WV C243 248 CE0251087Z 1000UF 25WV C35 CEM254767Z 47UF 25WV FLI EFCFW455HT 455 FL2 107 SFE10 7MX EYCAB10240 10 240MHZ X3 EYBAA15480 15 480 MHZ EYBAE10697 10 6975MHZ 1 1 1 ENSS00324Z LM324 IC3 ENRG871999 RCI 8719A IC7 045587 4558 IC9B239 ENRCI6130Z RCI 6130 ENNOHICO7A 7 08 17 T2SC01674L 2SC1674L 51 T2SC02538Z 2SC2538 052 T2SC01906Z 2SC1906 036 TDTCO124ES DTCI24ES 024 43 114 114 5 060 TDTA0124ES 124 5 Q30 33 62 T2SA01282E 2SA1282AE Q1 2 9 10 11 25 28 29 46 27 25 01675 2SC1675L Q3 4 5 7 16 31 35 39 40 42 T2SC00945P 2SC945P 44 53 57 06 38 T2SA00733P 2SA733P 055 T2SA01869Z 2SA1869
15. 10 410 95 134 wy 31 mm 29667 4 XIN W4 WY JU 173 80 gt LINII 299 5 121 48 18 TA OFT O ga R V 0718 616 10 4 919 ALIGNMENT 4 0 REOUIRED TEST OD DC Power Supply 13 8VDC 10 Freguency Counter 100 MHz RE Wattmeter 10W RF Signal Generator 100 MHz 3 Multi meter Automatic Distortion Meter Automatic Modulation Meter Oscilloscope 50 MHz 5 Audio Signal Generator Sinad Meter 4 1 ALIGNMENT PROCEDURES This transceiver has been aligned at the factory and does not require any adjustments at installation The required test equipment listed are used for the test setup or alignment shown in Figure 4 1 Transmitter Test Setup and Figure 4 2 Receiver Test Setup These test setups are used in part or total during the following adjustments Refer to page 14 for adjustment locations 4 1 1 PLL ALIGNMENT ADJUST ITEM U U T SETTING POINT MEASUREMENT Set radio to CH 1 AM RX mode 2 5 VDC 0 1 Connect Multi meter to TP2 Connect Oscilloscope to TP3 Adjust for max Connect Freguency Counter to IC3 Pin 8 10 2400MHz 20Hz AM Frequency Set radio to CH 19 AM RX mode Connect Freguency Counter to TP3 16 4900MHz 20Hz AM OSC Set radio to CH 19 AM TX mode Connect Freguency Counter to TP5 10 6950MHz 10Hz 11
16. 54 55 0502204 22 50 119 279 226 287 0503304 33PE 50 195 0503904 39PF 50WV 202 224 147 150 0504704 47 50WV 88 116 117 CC0506804A 68PE SOWV 194 192 0501515 150 50WV C196 222 295 0501815 150 50WV 139 05039040 9 50WV 0 CC0502004G 20 50 281 CC0501015G 100PF 50WV C282 CC0501815G 180PF 50WV C220 CC0502215G 220 50 C86 CC0502715G 270 50WV 201 203 CC0503915G 390PE 50 C210 CC0504715G 470 50 C74 85 CC0505615G 560PE 50WV 199 CD3005614Z 560P 300WV C7 47 50 95 99 110 118 120 CC0501027L 0 001UF SOWV 174 183 244 245 100 246 C81 173 193 206 207 236 CC0501047L 0 1UF 50WV 213 234 250 256 259 272 249 302 270 177 292 40 171 235 211 236 215 B236 C5 18 20 48 87 92 CC0504737L 0 047UF 50WV 96 102 105 106 257 151 160 233 240 247 251 253 258 260 261 263 217 65 C32 42 45 46 221 162 163 CC0504727L 0 0047UF 50 C155 CC0502237L 0 022UF SOWV C200 CC1001037L 0 01UF 100 C2 3 6 9 15 17 19 51 57 58 05010371 0 01UF 50WV 60 109 114 138 161 16 189 205 219 229 230 232 241 265 267 269 271 278 298 188 305 306 307 308 309 310 311 312 262 216 285 154 01622462 0 22UF 16WV C97 01610462 0 1UF 16WV C98 180 299 300 01622562 2 20 16WV 178 296 CMO0501045Z 0 10 50 C237 78 CM0501024Z 0 0010 50WV C184 CM0501035Z 0 010 50WV C39 185 CM0502235Z 0 0220 50WV C176 CM0504725Z 0 00470 5
17. AY The channel display indicates the current selected channel 4 2 1 2 REAR PANEL Figure 2 2 represents the location of the following connections This device complies with part 15 of the FCC Rules Operation is subject to the condition that this device does not cause harmful interference Service Manual at www GalaxyRadios com ___ MODELNO DX919 FCC ID MEE DX 929 NU a DC 13 8V AM 40 CH Galaxy gt gt CB TRANSCEIVER WN oe na DATE OF MFG SERIAL NO Figure 2 2 Rear Panel 1 ANTENNA This jack accepts 50 ohm coaxial cable with PL 259 type plug 2 DC POWER This jack accepts the 13 8V DC power cable with built in fuse The power cord provided with the radio has a black and red wire The black goes to negative and red goes to positive 3 PA SP This jack is for PA operation Before operating you must first connect a PA speaker 8 ohms 4W to this jack 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 This jack is used to connect the optional Galaxy FC347 six digit freguency counter connections including DC power are provided to the FC347 through this jack 2 1 3 FREOUENCY CHART CHANNEL CHANNEL FREOUENCY MHz CHANNEL CHANNEL FREOUENCY MHz 2 2 MICROPHONE The push to talk switch on
18. B PCB RF GAIN VR502 IKB o 2 th 1504 RANGER ELECTRONIC COMMUNICATIONS INC MODEL DX 929 CONTROL TITLE SCHEMATIC DIAGRAM APPROVED CHECKED prawer 7 2003 Z M LU No 919 SCHEMATIC DIAGRAM MAIN 5 5 GN 26 4k7 MR T MM Le 12002 455 k FLL 04 330 25 945 26 ko 05 25 733 255945 pooo p swe MOD PWR v 5 22 8501675 4 51 Se 330P V VOLUME MO vrsos soka D9 1N4148 R40 R61 47K VR4 500K NB AN R48 820K 5 nate 018 2310 D20 4148 12492 031 1 60 Fi Fe 9 0 ce 9 N4148 10 04 7 37 ce 69 R106 IM 1141 44148 D33 14748 Ok 1 025 10 240MHz 8561675 R117 PE 26
19. CH 14 5 919 MAINTENANCE Sees 5 0 PRECAUTIONS The inherent guality 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 1 Never key the transmitter unless an antenna or suitable dummy load is connected to the antenna receptacle ii Ensure that the input voltage does not exceed 16 VDC or fall below 11 VDC 11 Transmitting over long periods can cause heat built up and cause transmitter damage 5 1 PERIODIC INSPECTION This unit is aligned at the factory to deliver maximum performance However continued performance cannot be expected without periodic inspection and maintenance Important points to be checked regularly are as follows Check Item Action If cracked or broken replace it If sheath is cracked or immersed in water install new coaxial cable If loosened reconnect If plug connections corroded clean contacts Battery connection corroded clean power terminals Ground terminal If corroded clean terminal 5 2 FUSE REPLACEMENT To protect the equipment from serious damage a fuse is provided on the power supply lines The fuse protects against over voltage reverse polarity or internal fault of the equipment If the fuse has blown first find out the cause of the trouble before replacing it A fuse rated for more than the transceiver requirement sho
20. EL 1 x 2 D PLATE DX9 1 5 4 FRONT HOUSING 5 CH KNOB z 6 VR KNOB 4 OUTER KNOB NNER KNOB 200 4 PRING D gt k gt SK PLATE SW si 51 EPTO929 4 242012275 2 1 2 2 SULATING RING 2 25 2166 1 Z E 1 1 1 1 204 SIN NIN SININ BLIND RIVET ANT PCB 74 FOAM14X16X20MM 72 SCREW M2 6X4 6 73 BOTTOM HOUSING 1 74 SCREW M2X10 75 FIBER SHER UPDATES amp CORRECTIONS Any updates or corrections to this Service Manual will be included in the Tech Support section of our website at www GalaxyRadios com Galaxy Two Year Warranty This new Galaxy radio is covered by a two year limited warranty Here are the details e All of our Galaxy radio model numbers begin with the letters and are covered by our Limited Two Year Parts and Labor Warranty e Limited means that we will repair problems caused by factory defects or normal use at no charge Work performed by gualified technicians which did not cause any damage to the radio will not void the warranty and will be l
21. Galaxy CB Radio Model DX 9 Service Manual DIMME 2 2 VOL D SQ MIC GAIN R TALKBACK SWR NB ANL le IZ RX TX CB OFF 6 PWR PA Lo SWR POWER Copyright Reserved TABLE OF DX 919 CONTENTS PAGE CHAPTER 1 SPECIFICATIONS 1 0 General xis ii tai A a gk races e 2 11 Transmitter eaten os alae Pees 2 12 zdne s ina bja sledi 2 CHAPTER 2 OPERATION 2 0 Reh PL ie eed Bea VVE PV RI E REL SEN 3 2 1 Control amp E 3 22 Microphone a 7 2 3 SS o tS ladon os See A 7 2 4 Alternate Microphones And Installation 8 CHAPTER 3 CIRCUIT DESCRIPTION 3 0 Introduction reren ee CN ee Oe eek ae LOE eee 9 3 1 PEL cn ee 9 3 2 Receiver Circuit Sein o EV 9 3 3 Transmitter Modulation 9 3 4 Transmitter Amplifier Circuit 1 9 CHAPTER 4 ALIGNMENT 4 0 Required Test Equipment
22. Hz 1st IF 455 KHz 2nd IF Image Rejection 50 Adjacent Channel Selectivity 60dB RF Gain Control 45dB adjustable for optimum signal reception Automatic Gain Control AGC Figure Of Merit 100mV for 10dB Change in Audio Output Squelch Adjustable threshold less than 0 5uV Noise Blanker RF type Audio Output Power 2 5W 10 THD Audio Freguency Response 300 to 2500 Hz Built in Speaker 8 Ohms 4 Watts External Speaker Not Supplied 8 Ohms 4 Watts SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE 2 919 OPERATION EE 8 9 10 11 12 13 14 15 i RF GAIN DIMMER TALKBACK S 5 7 20 98 5 ZA A AN 1 LI 4 5 S l 23 PWA 5 MIC GAIN Gal N 9B ge 1 2 4 5 6 7 Figure 2 1 Front Panel 2 0 INTRODUCTION This section explains the basic operating procedures for the DX 919 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 1 MICROPHONE JACK Used to connect microphone for voice source 2 SOUELCH CONTROL This knob is used to eliminate background noise being heard through the receiver which can be disturbing when no transmissions are being heard through the receiver To use this feature turn the knob fully counterclockwise an
23. K 0 1W C401 C402 CK1102AB5X CHIP C 001uF 50VW C403 C404 CK1103AB5X CHIP C 50VW L402 YCTLI5653C CHOKE COIL 5 6uH L401 YCBAD18581 BEAD FERRITE COIL WB 403025 Q902 124 T R DTA124EUAT106 1 2 3 4 5 6 7 8 9 MIC GAIN 10203529 VR IKA VOL SQ OFF RV50303522 50 50 W SW POWER RV50203525 VR 5 J401 J408 J410 J411 J415 EX07N48223 PCB CONN S 2PIN J403 J413 EX07N48350 PCB CONN S 3PIN 1414 EX07W48824 PCB CONN S 3PIN J407 EX07N41216 PCB CONN S 3PIN J402 EX07N48222 PCB CONN S SPIN J409 EX07W48826 PCB CONN S SPIN 919 GAIN DIMMER CONTROL VR PCB EPT092950Z PART LIST DX 919 RF GAIN DIMMER CONTROL VR P C B REFERENCE NUMBER COMPONENT SIDE COPPER SIDE RANGER PART NUMBER 0929507 DESCRIPTION TB PCB 501 DIMMER RV50203525 VR 5 502 RF GAIN RV 10203528 VR IKB J501 EX07W48824 PCB CONN S 3 PIN J503 EX07N48350 23 PCB CONN S 3 PIN 919 METER PCB 0929617 COMPONENT SIDE COPPER SIDE COPPER SIDE SMD 24 PART LIST DX 919 METER PCB Dimmer Circuit REFERENCE NUMBER RANGER PART NUMBER EPT092961Z DESCRIPTION METER PCB R603 0115047
24. M6CK VR4 50400087 S E R 500 MIC 14 C amp E SH3028 WX01070702 JUMP WIRE JP5 14 15 16 17 18 30 35 WX01070705 JUMP WIRE 36 37 39 63 68 69 75 76 87 88 91 92 100 102 103 104 108 110 114 120 124 125 126 129 133 148 19 153 TP8 C131 C133 C142 R241 JP9 JP13 JP127 JP31 41 43 46 79 80 82 84 97 WX01070706 JUMP WIRE 106 155 6 JP25 57 70 71 96 116 117 WX01070707 JUMP WIRE 122 123 130 142 207 119 141 D25 D50 JP3 JP22 29 132 WX01070708 JUMP WIRE 1 11 20 38 40 42 83 4 1 6 WXx01070709 JUMP WIRE JP128 JP7 10 26 27 44 61 62 65 72 WX01070710 JUMP WIRE 73 74 78 33 89 95 114 115 138 150 151 152 66 67 77 105 146 147 149 JP8 21 51 139 86 WX01070711 JUMP WIRE JP12 52 140 WX01070712 JUMP WIRE JP48 111 137 144 154 34 WX01070713 JUMP WIRE 145 8 JP32 93 FL3 D26 WX01070714 JUMP WIRE JP1 47 49 50 54 56 58 90 WX01070715 JUMP WIRE 121 143 TP7 TP8 TP8 TP9 WX01070718 JUMP WIRE J7 17 22 25 31 34 EX07N48223 P C S 2P J6 11 18 32 EX07N48350 P C S 3P J21 EX07N48490 P C S 4P J3 5 20 EX07N48222 P C S 5P J14 EX07N48331 P C S 6P J33 EX07N48209 10 J12 EX07N41227 P C S 3P 5 716 EX07N41330 P C S 2P 2 3 5 EX07N48612 L 11 8 SP EX06N41045 EARJACK L503 WX0012015A TUBE L504 WH0007005Z LEAD WIRE 919 SCHEMATIC DIAGRAM CONTROL PCB COM J com P2 Cmain peh
25. V Mod 30 gt 2 0V Set switch to NB ANL position Connect Multi meter to D2 cathode AM Squelch Set radio to CH 19 AM RX mode Adjust very slowly Set SQ Control fully clockwise VR4 until squelch just RE SG setting 27 185 MHz 20mV Mod 30 closes SG setting 27 185 MHz 100uV Mod 30 1 on the 5 scale Bs O 0 0 0000 0000 u Oooo 5 EJ OJ A o O 0000 00000000 Figure 4 1 Transmitter test setup Ose Co OC Co 0000 0000 0000 13 Figure 4 2 Receiver test setup 919 MAIN PCB ADJUSTMENT LOCATION RF METER 2 55 AM LOW POWER 2 POWER AM MOD METER VRI 5 O 10 240 MHz lt lt ADJUST AM SQUEL
26. d then turn clockwise slowly until the background noise is just eliminated Further clockwise rotation will increase the threshold level which a signal must overcome in order to be heard Only strong signals will be heard at a maximum clockwise setting 3 ON OFF VOLUME CONTROL This knob controls the volume and power to the radio To turn radio on rotate the knob clockwise Turning the knob further will increase the volume of the receiver m 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 POWER CONTROL This control allows the user to adjust RF power output 6 SWR LED This LED lights red when your SWR is higher than about 3 1 This is not an exact indicator of 3 1 SWR but it is an indication that you should check your SWR reading 7 CHANNEL SELECTOR This control is used to select the desired transmit and receive channel 8 FRONT PANEL METER The front panel meter allows the user to monitor incoming signal strength RF output power SWR level and AM modulation level 9 RF GAIN CONTROL This control is used to reduce the gain of the RF receive amplifier under strong signal conditions 10 DIMMER CONTROL This knob controls the level of brightness for the meter lamp and channel display 11 SWR MOD PWR SWITCH
27. eft intact Problems caused by ungualified technicians or operator abuse can also be repaired but there will be a charge e The warranty period begins when the radio is first purchased However in the event that the dated sales receipt has been lost or the radio was purchased used our radios are still covered for 26 months from the date of manufacture based on the serial number Our warranty comes with the radio and remains valid even if you sell the radio to someone else Refurbished radios are distinguised from new radios by using the letter R as the first character of the serial number There are no off site Factory Authorized service centers for Galaxy DX models All warranty work must be done at our facility For maximum convenience these radios may be shipped directly to us for repair after obtaining a Repair Authorization Number RAN This RAN may be obtained from our website or by calling our Service Department at 760 480 8800 between 10 00 AM and 4 00 PM Pacific Time The RAN must be written below your return address on the outside of the shipping box Boxes which arrive without an RAN will be refused and the shipping company will return the unopened box to you Be sure to have a pen and paper ready along with the serial number of your radio before calling We will give you the RAN and our shipping address over the phone When you send your radio please include a copy of the sales receipt and a note with a detailed descripti
28. on of the symptoms especially if they are intermittent This will help our technicians locate the problem so we don t waste time sending the radio back and forth If possible please include a daytime phone number in case our technicians have any guestions Do not send your bracket power cord or microphone unless we ask you for these items during our phone conversation You are responsible for getting the radio safely to us We suggest using United Parcel Service UPS You must pay to ship the radio to us and we will pay to ship the radio back to you Since we use UPS and they do not deliver to Post Offices boxes please provide us with a street address for the return of your radio Be sure to print clearly We appreciate your choosing a Galaxy radio and we will make every effort to get you back on the air as soon as possible Be sure to visit our web site at www GalaxyRadios com Galaxy ATS919010A July 2003
29. the radio via the antenna and into the front end pre amp Q17 The RF signal is fed into the mixer circuit of Q18 Q19 and then into the AM section of the receiver The signal is then detected by the AM detector and then fed to the audio amplifier section of the receiver and finally out to the speaker 3 3 TRANSMITTER MODULATION CIRCUIT 1 The transmitter modulation circuit modulates the low level RF signal from the PLL exciter circuit with the user s audio voice signal from the microphone The audio from the microphone is then amplified and fed into the transmit amplifier circuit 2 The AF power amplifier modulates the last RF amplifier which produces a true amplitude modulated RF signal 3 4 TRANSMITTER AMPLIFIER CIRCUIT The transmitter takes the basic exciter signal from IC9 of the TX mixer and amplifies it through a series of amplifiers consisting of Q52 Q51 Q49 and Q47 where it is sent out to the antenna connector 39 280 XL NJAING Svo sor 2587169 670 XL Tid JIN Vid 221 Seo 66 6128 13 1 899 40 2 AT 899 540 2 2 291 43434018 A3XIW 629 Faces 20 829 ved 15 610 8
30. uld not be used since it may permanently damage the equipment Damage due to over fusing is not covered by the warranty 15 6 DIAGRAMS DX 919 PARTS LIST E 6 0 GENERAL Information on most electrical and mechanical parts is included in the parts list The reference designators are in alphanumeric order 16 919 ROTARY SWITCH PCB 0929207 0 PAT ii 2 Kobe sej SMD COPPER SIDE COMPONENT SIDE PART LIST DX 919 ROTARY SW P C B REFERENCE NUMBER RANGER PART NUMBER 0929207 DESCRIPTION ROTARY SW PCB R207 R210 R218 R219 RCY010004Z CHIP F R 0 0 0 1W R201 RCY013314Z CHIP F R 330 0 1W R202 R203 R204 R205 R206 RCY016814Z CHIP F R 680 2 0 1W R215 RCY014724Z CHIP F R 4 7K 0 1W R221 RCY016824Z CHIP F R 6 8K 0 1W R214 RCY012234Z CHIP F R 22K Q 0 1W R220 RCY016834Z CHIP F R 68K 0 1W A C201 C202 104 5 0 1uF 50WV D201 D202 D203 D204 D205 D206 D207 D208 D209 D210 D211 D212 D13 D214 D215 D216 D 217 D218 D219 D220 D 226 D227 D228 EDSS00355Y DIODE S M D 155355 D221 D222 D223 D224 D225 EDSS00181Y DIODE S M D 1SS181 TE85L Q207 TY2SC2712G TR 2SC2712GR TE85L 0201 0202 0203 0204 0206 TYZRN1403Z
31. ype 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 The third lead is for transmit control and the fourth is for receiving control The microphone should provide the functions shown in the schematic below Figure 2 3 4 WIRE MIC CABLE Pin Number Mic Cable Lead Audio Shield Audio Lead Transmit Control Receive Control Figure 2 3 Your Transceiver Microphone Schematic Figure 2 4 Microphone plug and pin numbers viewed from rear of pin receptacle 3 CIRCUIT DX 919 DESCRIPTION S 3 0 INTRODUCTION This section explains the technical theory of operation for the DX 919 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 The PLL circuit is programmed by the rotary channel switch GPS 668 The GPS 668 communicates the correct binary data information to the programmable divider inside of IC3 IC3 then controls the VCO Voltage Controlled Oscillator to oscillate on the correct frequency This signal is fed either into the receiver s first mixer for receive operation or the transmitter s mixer for transmit operation 3 2 RECEIVER CIRCUIT The incoming RF signal comes into
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