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PT500-2 Service Manual
PT500-2 Service Manual
RED-RADIO
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Summary of Contents for RED PT500-2

  • Page 1 PT500-2 Service Manual PT500-2 Service Manual RED-RADIO...
  • Page 2: Chapter 1 General

    In this manual you can find all the information of product service. RED-RADIO reserve the rights to modify the product construction and specification without notice in order to enhance product performance and quality.
  • Page 3 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 RED-RADIO. The radio and its accessories are all in the warranty. However, in one of the following cases, charge free service will be not available.
  • Page 4: Chapter 2 Radio Overview

    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.
  • Page 5: Chapter 3 Mode Introduction

    6. LED Indicator LED Indicates Status/Alert. Green LED lights when a carrier is detected in the current channel. Red LED lights during transmission. Orange LED flashes when receiving the Radio ID 5-Tone signaling or 2-Tone signaling or MDC signaling. Green LED flashes when scanning.
  • Page 6: Mode Combinations

    PT500-2 Service Manual Mode combinations Mode Function How to access User Mode For normal use Power on Data Reading and writing Receive instructions from frequency data and other Programming the PC functions mode Used to tune the radio Receive instructions from Test Mode using the PC.
  • Page 7 PT500-2 Service Manual 4. Turn on the power of the interphone. 5. Click on PT500 icon to perform the program. 6. In the main menu of the programming software, click on [Read] to read the parameters of the radio into the computer; click on [Write] to write the parameters set in the computer into the radio.
  • Page 8 PT500-2 Service Manual (20) RX squelch 9 close level (21) RX squelch 1 open level (22) RX squelch 1 close level (23) RSSI(-120dBm) (24) RSSI(-70dBm) Firmware Upgrading Mode The radio is equipped with an internal FLASH ROM, it can be upgraded if required.
  • Page 9: Chapter 4 Disassembly For Repair

    PT500-2 Service Manual Chapter 4 Disassembly For Repair The radio is a kind of sophisticated communication equipment with small and fine mechanical structure. You should assemble and disassemble it carefully during the maintenance process. The Instruction for assembly and disassembly are as follows:...
  • Page 10 PT500-2 Service Manual Notice: * Do not short-circuit the battery terminals or dispose the battery in fire. * Do not disassemble the battery case. Installing/Removing Antenna, Channel Selector, 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.
  • Page 11 PT500-2 Service Manual Install external speaker/MIC Open the cover of the jack for external speaker/MIC, and then insert the plug of the external speaker or microphone into the jack on the radio. When inserting the accessory plug, make sure it is properly aligned ( straight) to avoid internal damage to the connector in the radio.
  • Page 12 PT500-2 Service Manual Installing/Removing the Chassis, PCB...
  • Page 13 PT500-2 Service Manual 1. Remove the antenna, channel selector and power/volume knob and two screws under the channel selector and volume knob. 2. Screw off the two screws at the bottom of the radio by a hexagon screwdriver. 3. Pry up the aluminum shell by peaking a straight screwdriver in the cross-slot at the...
  • Page 14 PT500-2 Service Manual Exploded View of the Parts Parts No. Description Qty. 604PT50001001 Cabinet asm. 2010CU600004X Ear phone cabinet O-ring Φ5X1.5 2020PT500004X 304060250001X Volume screw M6X0.75X2.5 special shape brass 2010CU600006X Volume knob black 304070250001X Volume screw M7X0.75X2.5 special shape brass...
  • Page 15 PT500-2 Service Manual 7100500240471 Anntenna 2030CU600003X SMA RF socket O-ring Φ7X1.5 2020PT500003X 2010CU600005X radio top cover black 2020PT500002X 2 PIN power socket washer 301250607001X machine screw M2.5X6.0 PB(+) black Ni-plate 7110CLP02001 CLP-02 clip asm. 70600CB03001 Battery CB-03 (OR CB-05 70600CB05001) 301200807001X Machine screw M2.0X8.0...
  • Page 16: Circuit Description

    PT500-2 Service Manual 604PT50001002 AL cabinet asm. 2030PT500001X AL cabinet 2010CU600005X Radio top cover black 2020PT500001X Cabinet waterproof ring orange 2020PT500002X Power socket washer 301250607001X Machine screw M2.5X6.0 2010CU600006X Volume knob 2010CU600007X Encoder knob 7110CLP02001 CLP-02 Clip Chapter 5 Circuit Description 5.1 Frequency configuration...
  • Page 17: Receiver(Rx

    PT500-2 Service Manual Figure 5. 1 Frequency configuration 5.2 Receiver(Rx) The receiver is double conversion superheterodyne, designed to operate in the frequency range of 400 to 470MHz,The frequency configuration in Fig 2 Figure 5.2 Receiver section configuration Front End of Receiver...
  • Page 18 PT500-2 Service Manual The PWM wave is output by MCU composed of 58 foot and then commutated to adjustable voltage after filtering to change the capacity of varactor diode D905 D203 D206 D201 D202 and D204 to control the center frequency of BPF.
  • Page 19 PT500-2 Service Manual Figure 5.3 Schematic Diagram for IF System Receiving Audio Signal Processing: The audio processing circuit of receiver consists of IC300 and the peripheral circuit. Voice signals from IC200 are sent to IC301 ( CTCSS signaling filter circuit ) and IC300-D respectively after amplified in IC300-C.
  • Page 20: Squelch Circuit

    PT500-2 Service Manual Squelch Circuit Part of the AF signal from the IC200 enters the FM IC again,and the noise component is amplified and rectified by a filter and an amplifier to produce a DC voltage corresponding to the noise level.
  • Page 21 PT500-2 Service Manual Figure 5.5 Schematic Diagram for Power Amplifier and Antenna Switch The modulated RF signals from VCO are amplified by Q101, Q102 and Q105 before the power amplification in Q107. Gate bias of Q105 and Q107 is controlled by APC circuit, so the output power of transmitter can be controlled conveniently by changing the gate bias voltage.
  • Page 22 MIC, but the internal PTT is still effective. 5.4 PLL 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 oscillator (VCO), programmable frequency divider (PFD), phase comparator and low pass filter (LPF).
  • Page 23 PT500-2 Service Manual The oscillation frequency of VCO is compared with reference frequency to produce error signal after divided by PFD in IC1. The error signal is filtered by low pass filter before changing the VCO frequency to the set value in VCO (it is locking).
  • Page 24 PT500-2 Service Manual 5.7 MCU Unit: 5.9 Schematic Diagram for MCU Unit MCU Unit controls the operation of every unit to realize all functions of the PT500-2 Communication with external PC State data access Control PLL for the generation, receiving and transmitting of local oscillation frequency...
  • Page 25 PT500-2 Service Manual CTCSS/DCS signal coding and decoding: CTCSS/DCS signals from MCU (pin22 and pin18 output) are sent to VCO and TCXO for modulation respectively after filtering by R500 R501 C500 C501 and R504 R503 C920 C921. CTCSS/DCS signals from receiver are sent to MCU(pin52) for decoding, and then MCU test if there are CTCSS/DCS signals with the same setting of the station to decide whether open the speaker or not.
  • Page 26 PT500-2 Service Manual Frequency Frequency Frequency Frequency [Hz] [Hz] [Hz] [Hz] 67.0 94.8 131.8 186.2 69.3 97.4 136.5 192.8 71.9 100.0 141.3 203.5 74.4 103.5 146.2 210.7 77.0 107.2 151.4 218.1 79.7 110.9 156.7 225.7 82.5 114.8 162.2 233.6 85.4 118.8...
  • Page 27 PT500-2 Service Manual Table 5.2 DCS Coding Schedule 5.8 Description of Semiconductor Devices The distribution of each pin goes as the table 5.3. Table 5.3---Definition of CPU Base Pin:...
  • Page 28 PT500-2 Service Manual Active Pin No. Port Name Function Level Name APCSW APC switch PTT switch input Connect this pin to VCC via a 4.7K MODE resistor(*Burn) SIDE KEY1 input SIDE KEY2 input RESET CUP reset (*Burn) XOUT MCU clock...
  • Page 29 PT500-2 Service Manual GLED Green LED RLED Red LED TDIN TRFI TONE data input Alarm switch control(H:Controlled by ALARMC Volume Switch L:Emergency siren maximum volume) DEV2 Voice deviation adjustment 2 DEV1 Voice deviation adjustment 1 NARROW 12.5KHz MIDDLE 20KHz TXD1...
  • Page 30 PT500-2 Service Manual BUSY Busy level input TOPKEY TOPKEY input RXMUTE RX audio mute RSSI Received Signal Strength Indicator input PCTV APC/BPF control output AVSS DTMF DTMF/Beep output VREF AVCC RX_W/N RX Wide/Narrow switch Table 5.4 Functional description of semiconductor device...
  • Page 35 Chapter 7 PT500-2 Service Manual ADJUSTMENT 7.1 Required Test Equipment Table 7.1 Number Name Parameter requirements Above P2, compatible IBM PC, WINDOWS Computer 98/ME/2000/XPOperating System Programming PT500 Programming software software Programming Special Serial/USB (CPL-01) programming cable cable Output voltage:7.5V, output electric current:≥ 5A DC regulator Test range: 0.5---10W...
  • Page 36 Audio Frequency Test range: 10mV~10V voltmeter 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.
  • Page 37 PT500-2 Service Manual Figure 7.1 External Speaker/microphone Interface Definition 7.2 Adjustment Items Some detection and adjustment shall be made to the station technical data after changing the components during the maintenance. The debugging introduction of some related circuits goes as follows: Some parameters of the product can be adjusted by use of PT500 Programming Software of our company.
  • Page 38 PT500-2 Service Manual Steps for adjustment: 1) Enter Computer Test Mode by selecting “Test Mode” in main menu of PT500 Programming Software. 2) Select the items to be adjusted in choice menus, and then adjust the parameters by function keys on the computer keyboard. 3) Exit Computer Test Mode after adjustment.
  • Page 39 PT500-2 Service Manual 3.9kHz---4.5kHz (wideband) 3.2kHz--3.9kHz (median band) between 1.8kHz-- -2.3kHz (narrowband) (2/5)TONE, DTMF, MSK Deviation Adjust TONE, DTMF, MSK deviation in the computer adjustment mode. 3.2---4.0 kHz (wideband) 3.0kHz---3.6kHz (median band) 1.8---2.3kHz (narrowband) VOX1, VOX10 Adjust VOX1, VOX10 microphone sensitivity in the computer adjustment mode.
  • Page 40 RSSI(-120dBm), RSSI(-70dBm) The signal level output is set to -120dBm or -70dBm. Automatically records the corresponding RSSI level. Note: Voltage for the aforesaid tests: 7.5V +/-0.1V in room temperature Chapter 8 PT500-2 BOM No. TP-PT5002 PT500-2 PARTS LIST Component Name/Specificatio Parts No.
  • Page 41 PT500-2 Service Manual 702PT5002001 PT500-2 UNIT PT500-2 portable 701PT5002001 twoway radio PT500-2 packaging 605PT5000201 71200CT02001 CT-02 radio ring 70700CP02001 CP-02 rapid charger PT500U1 ANTENNA CRAK435001010 7100500240471 (about 160mm) 400-470MHz Power Supply(DC 709CA02US001 CA-02 12V 500mA) Lithium-ion Battery 70600CB05001 CB-05 1300mAH 7.4V...
  • Page 42 PT500-2 Service Manual R2 R9 R10 R222 R328 R407 R409 R413 R420 0402 CHIP R 1kΩ 1090410250001 RC0402JR-071K R427 R433 R434 R932 R951 R952 R967 0402 CHIP R 1.5kΩ 1090415250001 RC0402JR-071K5 R112 R331 R521 R525 0402 CHIP R 1.8kΩ 1090418250001...
  • Page 43 PT500-2 Service Manual R22 R107 R118 R126 R141 R307 R320 R330 0402 CHIP R 47kΩ 1090447350001 RC0402JR-0747K R917 R921 R968 0402 CHIP R 51kΩ 1090451350001 RC0402JR-0751K R524 0402 CHIP R 56kΩ 1090456350001 RC0402JR-0756K R216 R605 0402 CHIP R 68kΩ 1090468350001...
  • Page 44 PT500-2 Service Manual L400 R120 R147 R311 0603 CHIP R 0Ω 1090600050001 RC0603JR-070R R973 0603 CHIP R 4.7Ω 109064R750001 RC0603JR-074R7 R332 R959 R3 R104 R115 R200 0603 CHIP R 10Ω 1090610050001 RC0603JR-0710R R334 R412 R417 0603 CHIP R 22Ω 1090622050001...
  • Page 45 PT500-2 Service Manual GRM1555C1HR50B 112043P500091 0402 CHIP C 0.5pF C40 C49 Z01D GRM1555C1H1R0B 1120431P00091 0402 CHIP C 1pF C226 C238 Z01D GRM1555C1H1R5B 1120431P50091 0402 CHIP C 1.5pF Z01D GRM1555C1H2R0B 1120432P00091 0402 CHIP C 2pF C29 C951 Z01D GRM1555C1H3R0B 1120433P00091 0402 CHIP C 3pF...
  • Page 46 PT500-2 Service Manual GRM1555C1H560J C208 C259 C338 C947 1120435605091 0402 CHIP C 56pF C948 Z01D GRM1555C1H680J 1120436805091 0402 CHIP C 68pF C51 C252 Z01D GRM1555C1H101J C2 C3 C6 C31 C134 1120431015091 0402 CHIP C 100pF C910 Z01D GRM155R71H221K C205 C206 C529 C530...
  • Page 47 PT500-2 Service Manual GRM155R71H472K 1120434726091 0402 CHIP C 4700pF C204 A01D GRM155R71H562K 1120435626091 0402 CHIP C 5600pF C308 A01D GRM155R71H682K 1120436826091 0402 CHIP C 6800pF C309 C501 C921 C930 A01D GRM155R71H822K 1120438226091 0402 CHIP C 8200pF C300 A01D C19 C20 C37 C128 C201...
  • Page 48 PT500-2 Service Manual GRM155R61A105K C310 C413 C903 C904 0402 CHIP C 1μF 1120431056031 E15D C923 C926 C949 C959 GRM1885C1H1R0B 1120631P00091 0603 CHIP C 1pF C135 C151 C154 C155 Z01D GRM1885C1H1R5B 1120631P50091 0603 CHIP C 1.5pF C149 Z01D GRM1885C1H2R0B 1120632P00091 0603 CHIP C 2pF...
  • Page 49 PT500-2 Service Manual C5 C23 C56 C127 C200 C304 C307 C332 C408 0805 CHIP C 10μF 1120731066031 GRM21BR61A106K C519 C527 C940 C956 C970 CHIP-TAN 0.1μF P 1120721047081 TC211P104M035A C12 C18 CHIP-TAN 1μF P 1120721057051 TEESVP1C105M8R CHIP-TAN 10μF A 1121021066051 TEESVA1C106K8R...
  • Page 50 PT500-2 Service Manual SMALL FIXED 1140612215001 MLG1608SR22J L16 L17 L207 L901 INDUCTOR 220nH SMALL FIXED 1140713315001 C2012CR33J L200 INDUCTOR 330nH SMALL FIXED MLF1608AR47KT0 1140624716001 INDUCTOR 0.47μH SMALL FIXED 1140715615001 C2012CR56J L201 INDUCTOR 560nH SMALL FIXED 1140625616001 MLF1608DR56KT INDUCTOR 0.56μH SMALL FIXED...
  • Page 51 PT500-2 Service Manual VARIABLE CAPACITANCE 1030000132501 1SV325 D2 D4 DIODE TRANSISTOR、FET 1040002136201 TRANSISTOR 2SA1362-GR Q305 Q406A Q406B 1040002461701 TRANSISTOR 2SC4617(S) Q8 Q300 Q501 Q502 1040002498801 TRANSISTOR 2SC4988FRTR Q102 Q1 Q2 Q6 Q100 Q101 1040002506601 TRANSISTOR 2SC5066-Y Q201 Q503 1040000012301 TRANSISTOR...
  • Page 52 PT500-2 Service Manual FM IF 1020000313601 GT3136 IC200 DEMODULATOR 1020000521202 MICROPROCESSOR R5F212B8SNFP IC403 OPERATIONAL 1020000210001 NJM2100V IC500 AMPLIFIER OPERATIONAL 1020000290201 NJM2902V IC300 AMPLIFIER OPERATIONAL 1020000290401 NJM2904V IC100 IC301 AMPLIFIER AUDIO 1020000282201 TDA2822D IC302 PROCESSOR IC OTHERS CHIP CRYSTAL 1221009830402 [5032SMD(glass)]...
  • Page 53 PT500-2 Service Manual STRUCTURE 2010PT500001A PT500 radio front cabinet black 2010CU600002A CU600 PTT plastic key black PC+ABS 2950 CU600 ear phone plastic plug black PC+ABS 2010CU600003A 2950 2010CU600004A CU600 ear phone cabinet PC+ABS 2950 2010CU600005A CU600 radio top cover black PC+ABS 2950...
  • Page 54 PT500-2 Service Manual 2040CU600002A CU600 PTT metal dome plate Φ33mm air filter nylon weave 306003301001A 7mm mic air filter Φ7.0X4.5X0.2 2040CU600004A 304060250001A encoder screw M7X0.75 special shape brass 304070250001A volume screw M6X0.75 special shape brass machine screw M2.0X4.0 PB(+) Ni-plate nylok...
  • Page 55 PT500-2 Service Manual Chapter 9 CP-02 Charger 9.1 General Description: Function: intelligent rapid charging Applicable battery: CB-05(1300mAh, 7.4V Li-ion battery) Battery type identification: External Input power supply: DC12±0.5V, 500mA, ripples <500mV 9.2 Operating environment Temperature: -5℃ ℃±2-- +55℃ ℃±2 Humidity: 95%@40℃...
  • Page 56: Chapter 10 Block And Schematic

    PT500-2 Service Manual 0.2s ON Standby/battery 4.5s OFF not installed charging Charging completed Error 0.2s ON 0.2s OFF Chapter 10 Block and Schematic...
  • Page 58 PT500- DIAGRAM 2 BLOCK Title VER 1.0 Date:Size A3 Number Sheet of Revision File: Drawn By:...
  • Page 60: Appendix 1 Abbreviations

    PT500-2 Service Manual Appendix 1 Abbreviations (amplify, amplifier) (antenna) (automatic power control) (band pass filter) CTCSS (continuous tone control squelch system) (Digital code squelch) DEMOD (demodulation) (high pass filter) (instantaneous deviation control ) (intermediate frequency) (Light-Emitting Diode) (low noise amplifier)...
  • Page 61: Appendix 3: Troubleshooting

    PT500-2 Service Manual 16 个 Number of channels Channel separation W:25 kHz /M:20KHz/N:12.5kHz -30℃ ℃~ +60 Working temperature 50Ω Antenna Impedance Frequency Stability ±2.5ppm Battery (Standard Lithium-ion Battery: 1300mAh 7.4V Configuration) Dimension (W×L×H) 97.5 mm ×53.5 mm×31 mm Weight 230g (With battery and antenna) 7.2 Receiving part...
  • Page 62 PT500-2 Service Manual  Battery pack may not be installed properly. Remove the The radio cannot be switched on or battery pack and install it again. no display after  Battery power may be insufficient. Recharge or replace switched on.

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