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PT500-2

Service Manual

Chapter 2 Radio Overview

1. PTT ( PUSH-TO-TALK) Button
To make a call, press and hold the PTT button, then speak into the microphone in normal

voice. Release the PTT button to receive signals.

2.  Side Button 1 (Programmable Button)
3.  Side Button 2(Programmable Button)
4.  Channel Selector

Rotate to select channel 1~16.

5. Power/Volume Knob

Summary of Contents for PT500-2

Page 1: ...PT500 2 Service Manual 1 PT500 2 Service Manual RED RADIO...

Page 2: ...oduction This manual applies to the service and maintenance of PT500 radios and is for the engineers and professional technicians that have been trained by our company In this manual you can find all...

Page 3: ...he quality of the product using such components 1 3 Service All the RED RADIO products are subject to the service warranty After sales service will be provided and the length of warranty is stated by...

Page 4: ...To make a call press and hold the PTT button then speak into the microphone in normal voice Release the PTT button to receive signals 2 Side Button 1 Programmable Button 3 Side Button 2 Programmable...

Page 5: ...e 8 MIC Input Please keep your mouth about 10 cm 3 4 inches away from the microphone input to achieve the best voice quality If the distance is too far or too close to the radio it will affect the voi...

Page 6: ...e leaving the factory the radio has been set in factory However due to different requirements of users functional parameters of the radio such as working frequency channels CTCSS DCS and auto scanning...

Page 7: ...est Mode According to Figure 3 1 connect the radio to the computer with the special programming cable Warning Before entering the Test Mode please first connect a high frequency load of 50 ohm to the...

Page 8: ...radio is equipped with an internal FLASH ROM it can be upgraded if required 1 Connect the radio to the PC with a proper programming cable then power on the radio 2 Run computer programming software 3...

Page 9: ...ry please place it into the groove on the top of the radio chassis about 5mm away from latch If the radio has the belt clip installed you will have to press one side of the clip to raise it and slide...

Page 10: ...Power Volume Knob Screw the antenna out of the connector at the top of the radio by holding the bottom of the antenna and turn it counter clockwise until apart Using a smooth tool or a tool protected...

Page 11: ...plug make sure it is properly aligned straight to avoid internal damage to the connector in the radio Installing Removing the Belt Clip Use the 2 screws M2 5x8 0 supplied with the radio and fix these...

Page 12: ...PT500 2 Service Manual 12 Installing Removing the Chassis PCB...

Page 13: ...ross slot at the bottom of the aluminum shell and then pull out the surface shell after placing the aluminum shell inclined to the back but please be careful not to snap off the cable of the speaker 4...

Page 14: ...50001001 Cabinet asm 1 2 2010CU600004X Ear phone cabinet 1 3 2020PT500004X O ring 5X1 5 2 4 304060250001X Volume screw M6X0 75X2 5 special shape brass 1 5 2010CU600006X Volume knob black 1 6 304070250...

Page 15: ...PCB 1 19 2020PT500001X cabinet waterproof ring 1 20 301200407001X machine screw M2 0X4 0 14 Exchangeable part list No Parts No Description Qty 604PT50001001 Cabinet asm 1 2010PT500001X Radio front ca...

Page 16: ...2 Clip Chapter 5 Circuit Description 5 1 Frequency configuration The reference frequency of frequency synthesizer is provided by 12 8MHz crystal oscillator X1 TCXO The receiver adopts quadric mixing m...

Page 17: ...Signals from the antenna are filtered by BPF which consists of C235 C236 C233 C604 C252 C951 C234 C255 C260 L211 L209 L208 D201 D202 and D204 via RX TX switch D101 D102 and D103 After being filtered...

Page 18: ...ilter XF201 IF Circuit The 1st IF signal from crystal filter is amplified by the first IF amplifier Q201 before processing of IC in IF IC200 GT3136 IF IC consists of the 2nd mixer 2nd local oscillatio...

Page 19: ...1 CTCSS signaling filter circuit and IC300 D respectively after amplified in IC300 C After that the signals are removed of the HF and LF components after amplification de emphasis and filtering by oth...

Page 20: ...wer Amplification The audio power amplifying circuit consists of IC302 and the peripheral components The signals are amplified by audio power amplifier to drive the speaker after collecting the receiv...

Page 21: ...Circuit R130 R131 and R132 are power amplification current detector IC100A is power amplification current sampling amplifier and IC00B is power comparison amplifier The power amplification current and...

Page 22: ...Frequency Synthesizer Figure 5 8 Schematic Diagram for Frequency Synthesizer The PT500 2 adopts PLL frequency synthesizer Frequency synthesizer consists of reference oscillator voltage controlled osc...

Page 23: ...during night or under dark condition The speaker will voice the current channel number when changing the channel every time because of the voice memory chip IC401 which stores channel voice prompts 5...

Page 24: ...mitting of local oscillation frequency Access to the current channel state Control LED status indicator Control power supplied condition of every unit Detect action of every function key Produce CTCSS...

Page 25: ...not CTCSS continuous tone control squelch system hereinafter referred to as CTCSS is a kind of squelch control system with modulation on carrier and continuous sub audio signals as pilot tone If CTCS...

Page 26: ...with voice signal and used for squelch control If DCS function is set the speaker is available only when receiving the same DCS code to avoid the disturbance of useless signals The station has 83 kind...

Page 27: ...1 243 351 503 664 043 132 244 364 506 703 047 134 245 365 516 712 051 143 251 371 532 723 054 152 261 411 546 731 065 155 263 412 565 732 071 156 265 413 606 734 072 162 271 423 612 743 073 165 306 43...

Page 28: ...switch 12 F_CS P53 O L FLASH chip select output 13 F_DI P52 O FLASH data in 14 F_CLK P51 O FLASH serial clock output 15 F_DIO P50 I O FLASH data input output 16 NC P27 O 17 VCCN P26 O Frequency regul...

Page 29: ...Reserved 39 MIC_MUTE P65 O L MIC mute L MIC mute 40 5TC P64 O H Transmitting power control 41 EXTPTT P63 I L External PTT switch input 42 SAVE P31 O H Battery power control H Power save 43 5RC P30 O H...

Page 30: ...cription of semiconductor device Item Model Function Description IC1 MB15E03 Frequency Synthesizer IC100 NJM2904 APC Voltage Comparison Driving IC200 GT3136 Receiver 2nd Local Oscillation 2nd IF Ampli...

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Page 35: ...nge 100MHz 500MHz Resistance 50 SWR 1 2 7 Frequency meter Frequency range 0 1 600MHz Frequency accuracy higher than 1 10 6 Sensitivity higher than 100mV 8 Frequency deviator Frequency range DC 600MHz...

Page 36: ...14 Audio Frequency voltmeter Test range 10mV 10V Recommend how to use item 6 7 8 10 11 and 12 which listed in the table can be substituted by integrated tester HP8920 HP8921 33...

Page 37: ...e of our company The adjustable parameters are as follows 1 Frequency stability 2 RF transmitting high power 3 RF transmitting Middle power 4 RF transmitting Low power 5 Maximum TX voice deviation 6 V...

Page 38: ...of PD by DMM which shall less than 4 0V Table 7 2 High Intermediate Low Frequency Point of All Models Low Frequency Intermediate High Frequency Point Frequency Point Point PT500 2 400 100 MHz 435 100...

Page 39: ...tment mode Make the transmitting demodulation waveform be flat square wave DCS deviation Signal source LPF 300Hz Adjust DCS frequency deviation in the computer adjustment mode 0 50kHz 0 85kHz wideband...

Page 40: ...or 119dBm narrowband Automatically records the corresponding squelch level Squelch 1 open The signal level output is set to 124dBm wideband or 123dBm narrowband Automatically records the corresponding...

Page 41: ...5001 Lithium ion Battery 1300mAH 7 4V CB 05 1 12 13 14 701PT5002001 PT500 2 portable two way radio 15 16 RESISTOR 17 1090400050001 0402 CHIP R 0 RC0402JR 070R 6 R4 R7 R13 R419 R901 R911 18 10904101500...

Page 42: ...R 4 7k RC0402JR 074K7 4 R32 R416 R607 R909 32 1090456250001 0402 CHIP R 5 6k RC0402JR 075K6 8 R101 R301 R302 R324 R326 R910 R914 R923 33 1090468250001 0402 CHIP R 6 8k RC0402JR 076K8 2 R523 R972 34 1...

Page 43: ...7120K 2 R30 R340 50 1090415420001 0402 CHIP R 150k RC0402DR 07150K 6 R134 R135 R136 R137 R138 R507 51 1090418450001 0402 CHIP R 180k RC0402JR 07180K 2 R202 R306 52 1090422450001 0402 CHIP R 220k RC040...

Page 44: ...6150001 0603 CHIP R 560 RC0603JR 07560R 1 R20 72 1090618250001 0603 CHIP R 1 8k RC0603JR 071K8 1 R534 73 1090622250001 0603 CHIP R 2 2k RC0603JR 072K2 1 R144 74 1090627250001 0603 CHIP R 2 7k RC0603JR...

Page 45: ...GRM1555C1H4R0B Z01D 1 C44 98 1120435P00091 0402 CHIP C 5pF GRM1555C1H5R0B Z01D 1 C215 99 1120436P00091 0402 CHIP C 6pF GRM1555C1H6R0B Z01D 5 C53 C105 C222 C234 C239 100 1120437P00091 0402 CHIP C 7pF G...

Page 46: ...71K A01D 63 C7 C24 C25 C27 C46 C48 C52 C55 C57 C101 C102 C103 C106 C107 C109 C110 C120 C121 C125 C129 C132 C139 C141 C143 C157 C203 C218 C224 C228 C231 C232 C236 C237 C253 C254 C257 C402 C403 C406 C41...

Page 47: ...C421 C422 C425 C508 C515 C603 C924 C934 C935 C936 C937 C939 C961 C962 C963 C967 122 1120431836071 0402 CHIP C GRM155R71E183K 1 C301 0 018 F A01D 123 1120432236071 0402 CHIP C0 022 F GRM155R71E223K A12...

Page 48: ...C140 C150 135 1120631805091 0603 CHIP C 18pF GRM1885C1H180J A01D 1 C111 136 1120632705091 0603 CHIP C 27pF GRM1885C1H270J A01D 2 C118 C138 137 1120636805091 0603 CHIP C 68pF GRM1885C1H680J A01D 1 C14...

Page 49: ...60100001 0603 FERRITE CHIP BLM18AG601S 10 L1 L7 L10 L19 L103 L206 L402 L403 L500 L904 157 1170722100001 0805 FERRITE CHIP BLM21PG221S 4 L104 L105 L501 L502 158 1170760000001 0805 FERRITE CHIP BLM21PG6...

Page 50: ...OR 3 3 H MLF1608A3R3KT 1 L902 173 1152R351R6041 AIR CORE COIL 4T E20 35 1 6 4TR 9 L110 L112 L113 L114 L203 L204 L208 L209 L214 174 1152R351R6081 AIR CORE COIL 8T ER0 35 1 6 8 1 L106 175 176 DIODE 177...

Page 51: ...4EE TL 2 Q109 Q303 196 1040000011401 TRANSISTOR DTC114EE TL 3 Q5 Q400 Q401 197 1040000014402 TRANSISTOR DTC144EE TL 14 Q106 Q108 Q200 Q304 Q306 Q403 Q405 Q903 Q907 Q908 Q910 Q911 Q912 Q914 198 1040000...

Page 52: ...X400 220 1221012800002 TCXO 3225VCTCXO 12 8 MHz 1 X1 221 1080000388501 38 85MHz CRYSTAL FILTER MCF 5 2 5KHz 1 XF201 222 1010500200102 PT500 2 PCB PT500 2V02 PCB 1 223 1080000045001 Ceramic Filter ELFY...

Page 53: ...ABS 2950 1 246 2010CU600010A CU600 light guider clear PC 1 247 2020CU600001A CU600 PTT silicon key block 60A 50 high spring silicon 1 248 2020PT500001A PT500 cabinet waterproof ring orange 40A 50 high...

Page 54: ...A encoder screw M7X0 75 special shape brass 1 262 304070250001A volume screw M6X0 75 special shape brass 1 263 301200407001A machine screw M2 0X4 0 PB Ni plate nylok blue patch 14 264 301200807001A ma...

Page 55: ...time 300 minutes Max Battery temperature 55 Specified voltage of charged battery Nickel hydrogen battery recovery the battery when the voltage 3 7V pre charging when the voltage 6 4 0 1V when the batt...

Page 56: ...PT500 2 Service Manual 56 Standby battery not installed 0 2s ON 4 5s OFF charging ON Charging completed ON Error 0 2s ON 0 2s OFF Chapter 10 Block and Schematic...

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Page 58: ...Title PT500 DIAGRAM2 BLOCK Date Size A3 Number Sheet of Revision VER 1 0 File Drawn By A 1 2 3 4 5 6 7 8 A...

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Page 60: ...us deviation control IF intermediate frequency LED Light Emitting Diode LNA low noise amplifier LPF low pass filter MCU micro control unit MIC microphone MOD modulation MONI monitor PLL phase lock loo...

Page 61: ...nd antenna 7 2 Receiving part Sensitivity 12dB SINAD 0 25 V W 0 28 V N Adjacent channel selectivity W 70dB N 60dB Intermodulation immunity 70dB 50 100kHz Audio Output Power 1W 16 Audio distortion 5 7...

Page 62: ...t communication range 4 Other voices from non group members are heard on the channel Change the CTCSS DCS tone and make sure change the tone on all radios in your group Please set 5 Tone selective sig...

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