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PT500-2 Service Manual
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PT500-2 Service Manual
RED-RADIO
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PT500-2 Service Manual
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PT500-2 Service Manual
Contents
Chapter 1
General
Chapter 2
Radio Overview
Chapter 3
Mode Introduction
Chapter 4
Disassembly For Repair
Chapter 5
Circuit Description
Chapter 6
PCB Layout
Chapter 7
Adjustment
Chapter 8
Bill Of Materials
Chapter 9
Charger
Chapter 10 Block and Schematic
Appendix 1 Abbreviations Appendix 2 Main Technical Indexes Appendix 3 Trouble
Shooting
Chapter 1 General
1.1 Introduction
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 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. Read this manual before repairing the product.
1.2 Attention
Safety
Do not touch the antenna connector with your skin directly. .
Do not reverse the power polarities.
Do not turn on the radio before the antenna and load connection is completed.
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Do not contact the damaged antenna when transmitting, or may make lightly burning on the
skin.
Electromagnetism Interference
It’s prohibited to use or repair the radio in the following places:
Hospital, health center, air port
Any area with a potentially explosive atmosphere (e.g. fuel and chemical storage and
transport devices etc.)
Any area of dynamite or exploder.
Change Components
All the components used in repair service should be supplied by RED-RADIO.
Other components of the same models available on the market are not surely able to use in
this product and we do not guarantee the 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 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.
No valid service warranty or original invoice.
Malfunction caused by disassemble, repair or reconstruct the radio by the users without
permission.
Wear and tear or any man-made sabotage such as mechanical damage, burning or water
leaking.
Product serial number has been damage or the product trademark is difficult to identify.
Beyond the warranty time, lifetime service is still available with paid. And we also provide
service components to service stations and staff.
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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
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Turn clockwise to switch on the radio.
Turn counterclockwise till a click is heard to switch off the radio.
Rotate to adjust the volume after turning on the radio.
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. Red LED flashes when low battery.
7. Speaker/Microphone Jacks
Used to connect the optional speaker/microphone.
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 voice quality.
Programmable Button Function
The dealer can program the Side Button 1, Side Button 2 and the Top Button with the
following Optional functions:
None (No Function)
Annunciation Selection
Talkaround
Call1/Call2/Call3/Call4
Lone Work
Emergency Call
Cancel Emergency Call
Scan
Noise Channel Delete
Call Forward
H/M/L Power Switch
Squelch Adjust
Monitor Momentary/Call Cancel
Monitor/Call Cancel
Squelch Off Momentary/Call Cancel
Squelch Off/Call Cancel
Lock Keyboard
Battery Check
Surveillance
CTCSS Scan/Forever Save CH
CTCSS Scan/Save CH
Chapter 3 Mode Introduction
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Mode combinations
Mode
Function
How to access
User Mode
For normal use
Power on
PC
Mode
Data
Programming
mode
Reading and writing
frequency data and other
functions
Receive instructions from
the PC
Test Mode
Used to tune the radio
using the PC.
Receive instructions from
the PC
Firmware
Upgrading
Mode
Upgrades the software
when new features are
added
Receive instructions from
the PC
User Mode：
You can enter User Mode (conventional communication mode) by turning on the power
switch. Users in the mode can use the defined function of the radio.
Data programming mode:
Before 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, etc. should be set again. Therefore, the company
has specially designed a set of PT500 programming software with friendly interface,
convenient operation and visualized display for setting functional parameters of the radio.
Steps for setting the functional parameters of the interphone by computer are as follows:
1. Install PT500 programming software on the computer.
2. As shown in the figure below, connect the radio to the computer through a special serial
or USB programming cable.
Comput
(RS232 seria
/USB po
Programm
cable
Radio
(Earphone /Program port)
Figure 3-1
3. Turn on the power of the computer.
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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.
Caution:
1. Before editing for the first time, the data should be read from the interphone and properly
backed up.
2. If the edited data cannot work normally after being written into the interphone, please
open the backup data and rewrite them.
3. “Model Information” is the important information of the interphone and should not be
altered.
Test 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 antenna port of the radio or connect the radio a certain test instrument.
With the PT500 Programming Software, you can enter the adjustment status in Computer
Test Mode to adjust the following parameters of the radio:
（1） Frequency stability
（2） RF transmitting high power
（3） RF transmitting Middle power
（4） RF transmitting Low power
（5） Maximum TX voice deviation
（6） VOX1(Tight)
（7） VOX10
（8） 2/5 tone deviation
（9） DTMF deviation
（10） MSK deviation
（11） DCS/LTR balance
（12） DCS deviation
（13） LSD deviation
（14） CTCSS(67.0Hz) deviation
（15） CTCSS(254.1Hz) deviation
（16） Battery warning level
（17） RX Sensitivity
（18） DCS RX middle level
（19） RX squelch 9 open level
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（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.
1. Connect the radio to the PC with a proper programming cable, then power on the radio.
2. Run computer programming software.
3. Select the right “com port” you connected and the upgrading firmware and then click on
“E.P” to start downloading. 4. Turn off the radio and exit the programming software.
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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:
Installing/Removing the Battery Pack
To install the battery, 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 the battery in proper position.
Press the battery with your fingers and push the battery until you hear a latch click, the
battery is now installed.
Removing the battery pack：
If you want to remove the battery from the radio, first press the battery latch located on the
bottom of the radio, and then press down to slide the battery about 5mm to release the
latch.
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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.
Using a smooth tool or a tool protected with cloth to hold or prize up form the bottom of
channel selector or volume knob until apart，then screw the two screws under the channel
selector and volume knob using the special tool.
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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.
Installing/Removing the Belt Clip
Use the 2 screws (M2.5x8.0) supplied with the radio and fix these screws on the holes in the
radio clip and into the holes in the aluminum case. If you want to remove the clip from the
radio, just unscrew them, and remove the clip, you can put the screws back to make sure
you do not loose them.
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Installing/Removing the Chassis, PCB
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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
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． Screw off the 11 screws on the PCB by a cross screwdriver.
5． Unsolder the endpoints of the antenna , PTT key board and speaker by an electric iron,
then remove the main board.
After the disassembly above, you can carry out corresponding reparation and debugging
according to the actual malfunction.
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Exploded View of the Parts
No.
Parts No.
Description
Qty.
1
604PT50001001
Cabinet asm.
1
2
2010CU600004X
Ear phone cabinet
1
3
2020PT500004X
O-ring Φ5X1.5
2
4
304060250001X
Volume screw M6X0.75X2.5 special shape brass
1
5
2010CU600006X
Volume knob black
1
6
304070250001X
Volume screw M7X0.75X2.5 special shape brass
1
7
2010CU600007X
Encoder knob black
1
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8
7100500240471
Anntenna
1
9
2030CU600003X
SMA RF socket
1
10
2020PT500003X
O-ring Φ7X1.5
1
11
2010CU600005X
radio top cover black
1
12
2020PT500002X
2 PIN power socket washer
1
13
301250607001X
machine screw M2.5X6.0 PB(+) black Ni-plate
2
14
7110CLP02001
CLP-02 clip asm.
1
15
70600CB03001
Battery CB-03 (OR CB-05 70600CB05001)
1
16
301200807001X
Machine screw M2.0X8.0
2
17
2030PT500001X
AL cabinet polishing ADC 12
1
18
1010500200102
Main 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 cabinet black
1
2
2010CU600010X
Light-guider clear PC
1
3
2010CU600002X
PTT plastic key black
1
4
2010CU600003X
Ear phone plastic plug
1
5
2010CU600008X
Ear phone cover black
1
6
2020CU600001X
PTT silicon key block
1
7
306003301001X
Φ36mm air filter nylon weave
1
8
1211361601001
Speaker Φ36mm
1
9
2040CU600004X
7mm mic air filter Φ7.0X4.5X0.2
1
10
2020CU600004X
Mic waterproof washer
1
11
2010CU600009X
Battery locker black
1
12
2030CU600004X
Spring Φ2.3X10.5 Φ0.25
2
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604PT50001002
AL cabinet asm.
1
2030PT500001X
AL cabinet
1
2
2010CU600005X
Radio top cover black
1
3
2020PT500001X
Cabinet waterproof ring orange
1
4
2020PT500002X
Power socket washer
1
5
301250607001X
Machine screw M2.5X6.0
2
2010CU600006X
Volume knob
2010CU600007X
Encoder knob
7110CLP02001
CLP-02 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 mode. The first IF is 38.85MHz, and the
second IF is 450kHz. The first local oscillation signal of the receiver is produced by frequency
synthesizer and the second local oscillation signal selects the 3rd harmonics of 12.8MHz of
crystal oscillator X1 TCXO. The signal of transmitter is produced by frequency synthesizer
directly.
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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
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 out the useless out-of-band signals, the signals are
amplified by LNA consisting of Q203 and external components.
Signals from LNA are filtered again by BPF which consists of C228 C226 C238 C229 C227
C239 C947 C259 C948 L214 L204 L203 D905 D206 and D206 before entering the 1st mixer
(Q202).
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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.
1st mixer
The first IF (51.65MHz) signal is produced after mixing of the receiving signal from LNA and
the 1st local oscillation signal from frequency synthesizer. The first IF signal is filtered out
adjacent channel and other useless signals by crystal filter (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 oscillation, IF amplifier, limiter, frequency
discriminator and noise amplifier.
Frequency (12.8MHz) produced by TCXO(X1) is amplified and then selects 3rd harmonics
(38.4MHZ) as the second local oscillator signal source. The second IF signals (450kHz) are
generated after signals mixing of the second local oscillation (38.4MHz) and the first IF
(38.85MHz) in IC200. Audio signals are demodulated and outputted by IC200 after the
second IF signals are amplified and limited in IC200 and then filtered by ceramic
filter(450kHz).
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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. After that, the signals are removed of the HF and LF
components after amplification, de-emphasis and filtering by other units of IC300, and only
audit components from 300 to 3000Hz can be sent to audio power amplifier (IC302) after
amplified in Q300 and adjusted by volume potentiometers.
Figure 5.4 Schematic Diagram for Audio Processing of Receiver
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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.
The DC signal from the FM IC goes to the analog port of the microprocessor(IC403).IC403
determines whether to output sounds from the speaker by checking whether the input
voltage is higher or lower than the preset value.
To output sounds from the speaker,IC403 sends a high signal to the MUTE and AFCO lines
and turns IC302 on through Q302 Q304 and Q305.
Audio Power 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
receiving audio signals, voice signals and warning tone signals. The warning tone has no
volume limitation.
When AFCO is high level, Q304 is on, IC302 begins to work and the speaker sounds.
Speaker Impedance: 16ohm
CTCSS Signal filtering
The audio signals after demodulation in IC200 may contain CTCSS (continuous tone control
squelch system) or DCS （ digital squelch ） signals. The spectrum component of
CTCSS/DCS is 67 to 250Hz. The filtering circuit composed of IC301 can filter out signals
except CTCSS/DCS spectrum, which makes MCU decode the CTCSS/DCS more
accurately.
5.3 Transmitter (Tx)
Transmitter Power Amplifier
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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.
APC（Automatic Power Control）
Figure 5.6 Schematic Diagram for APC 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 IC100A output will increase with oversized output power
of transmitter. When the output voltage of IC100B decreases, the bias voltage of Q105 and
Q107 will decrease, finally the output power of transmitter will decrease or vice versa. Thus,
the output power of transmitter will keep stable under any different working condition. MCU
can set the power by changing the voltage input to IC100B.
Audio Signal Processing of Transmitter
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Figure 5.7 Schematic Diagram for Audit Circuit of Receiver
The audio signal processing circuit of Transmitter consists of IC500 and the peripheral
components. Voice signals from MIC are sent to VCO for modulation together with
CTCSS/DCS after amplification, limitation and filtering.
AGC circuit consists of D500, D501 and Q503. The signal amplitude is reduced to ensure
no distortion in case of oversized MIC signal.
Q504, the power switch of voice processing circuit, controlled by MCU, will give power supply
to IC500 only during transmission.
J501 is the socket for external MIC, and the internal MIC will disconnect automatically when
using external 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).
RX VCO Unit consists of Q4 D2 D4 L14 C35 C41 C44 C45 and D1 Q5.
TX VCO Unit consists of Q4 D2 D4 L14 C35 C41 C44 and C45,D5 is the modulation circuit
of VCO.
IC1 (MB15E03) is PLL integrated circuit and contains programmable parametric frequency
divider (PPFD), programmable frequency divider (PFD), phase comparator and charge
pump, etc.
Low pass filter consists of R5 R7 R9 R10 C12 C15 and C18.
Reference frequency is provided by X1 (TCXO, 12.8MHz).
Reference frequency of TCXO (Temperature-controlled Crystal Oscillator) is divided by
PPFD in IC1 to produce reference frequency of 5kHz or 6.25kHz (controlled by MCU based
on the set channel frequency).
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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).
N=F
VCO/FR
N：Division Frequency
F
VCO
：VCO Oscillation Frequency
FR：Reference Frequency
Lock lost detection: When PLL is out of lock, IC pin14 will output low level signal to MCU，
and then MCU prohibit transmitter from transmitting with a warning tone.
Q8, the power filter, can provide PLL with more purified power to reduce the noise of
frequency synthesizer.
5.5 Voice Circuit
The station is equipped with Voice Prompt Function, which is very useful 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.
5.6 Power Supply:
The station use lithium battery (7.4V, 1300mAh), while transmitter amplifier circuit (Q105
Q107) and receiver audio amplifier (IC302) use battery directly for power supply, and other
circuits use regulated voltage (5V and 3V).
IC404:micro-power voltage stabilizer of 3V LDO, provides power (3V) of heavy current for
the station together with Q10 and Q30.
IC902:5V LDO
Q405: 5T switch (controlled by MCU)
5T: supply power for the front end of transmitter
Q408: 5R switch (controlled by MCU)
5R: supply power for the units such as RF amplification, mixing, IF processing and
audio signal processing.
Q910: 5C switch (controlled by MCU)
5C: the power (5V), controlled by power-down mode, is the supply power of frequency
synthesizer.
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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
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 signal
Produce DCS signal
Produce power controlled signal
Finish CTCSS decoding
Finish DCS decoding
Squelch detection and control Control voice
prompt content
Memory (FLASH)
Channel data, voice data and other function setting data and parameter adjustment data.
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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.
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 CTCSS function is set, the call is available only at the same CTCSS
frequency of both receiving and transmitting parties to avoid the disturbance of other signals.
The station has 39 groups of standard CTCSS frequency for your selection, such as Table
5.1.
CTCSS signals produced by MCU are sent to VCO for modulation after filtered the HF
components over 300Hz in low pass filter composed by RC.
Table 5.1 CTCSS Frequency Table
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No.
Frequency
[Hz]
No.
Frequency
[Hz]
No.
Frequency
[Hz]
No.
Frequency
[Hz]
1
67.0
11
94.8
21
131.8
31
186.2
2
69.3
12
97.4
22
136.5
32
192.8
3
71.9
13
100.0
23
141.3
33
203.5
4
74.4
14
103.5
24
146.2
34
210.7
5
77.0
15
107.2
25
151.4
35
218.1
6
79.7
16
110.9
26
156.7
36
225.7
7
82.5
17
114.8
27
162.2
37
233.6
8
85.4
18
118.8
28
167.9
38
241.8
9
88.5
19
123.0
29
173.8
39
250.3
10
91.5
20
127.3
30
179.9
DCS signaling：
DCS (Digital code squelch), is a kind of continuous digital code modulated on carrier 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 kinds of standard codes including positive and inverse code for your selection,
such as Table 2.
DCS signals produced by MCU (PWM waveform) are sent to VCO and TCXO for modulation
(the HF components of DCS signals are modulated by VCO, while the LF components by
TCXO) after filtered the HF components over 300Hz in low pass filter composed by RC.
CTCSS/DCS signals from receiver are sent to MCU for decoding, and then MCU test if there
are DCS codes with the same setting of the station to decide whether open the speaker or
not.
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Table 5.2 DCS Coding Schedule
023
114
174
315
445
631
025
115
205
331
464
632
026
116
223
343
465
654
031
125
226
346
466
662
032
131
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
431
624
754
074
172
311
432
627
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:
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Pin No.
Port Name
Pin
Name
I/O
Active
Level
Function
1
APCSW
P33
O
H
APC switch
2
PTT
P34
I
L
PTT switch input
3
MODE
-
-
-
Connect this pin to VCC via a 4.7K
resistor(*Burn)
4
SK1
P43
I
L
SIDE KEY1 input
5
SK2
P44
I
L
SIDE KEY2 input
6
RESET
-
I
L
CUP reset (*Burn)
7
XOUT
-
O
-
MCU clock
8
VSS
-
-
-
GND
9
XIN
-
I
-
MCU clock
10
VCC
-
-
-
+3V
11
BSHIFT
P54
O
H
Beat shift 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 regulation output（PWM）
18
DCSTCXO
P25
O
-
CTCSS/DCS output（PWM）
19
PLL_CLK
P24
O
H
PLL clock Output
20
PLL_DAT
P23
O
-
PLL data Output
21
PLL_EN
P22
O
H
PLL enable
22
DCSVCO
P21
O
-
CTCSS/DCS output（PWM）
23
PLL_UL
P20
I
H
PLL unlock detect pin
24
RXVCO
P17
O
H
TX/RX VCO selection(H,RX)
25
BEEP_AF
P16
O
-
Local Beep Control Pin
26
RXD0
P15
I
-
Serial data
27
TXD0
P14
O
-
Serial data
Page 29
PT500-2 Service Manual
29
28
GLED
P86
O
H
Green LED
29
RLED
P85
O
H
Red LED
30
NC
P84
O
31
TDIN
P83
I
TRFI
TONE data input
Alarm switch control（H：Controlled by
32
ALARMC
P82
O
L
Volume Switch
L：Emergency siren maximum volume)
33
DEV2
P81
O
-
Voice deviation adjustment 2
34
DEV1
P80
O
-
Voice deviation adjustment 1
35
NARROW
P60
O
H
12.5KHz
36
MIDDLE
P45
O
H
20KHz
37
TXD1
P66
O
-
Reserved
38
RXD1
P67
I
-
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
Receiving power control
44
ENC0
P36
I
-
Channel selector input
45
ENC1
P32
I
-
Channel selector input
46
ENC2
P13
I
-
Channel selector input
47
ENC3
P12
I
-
Channel selector input
48
VOX
P11
I
AN9
VOX level input
49
BATT
P10
I
AN8
Battery voltage input
50
AFCO
P00
O
L
Audio Amplification Power
51
SPKSW
P01
O
L
Audio amplifier control
52
DCS_IN
P02
I
AN5
CTCSS/DCS input Recording level input
53
NC
P03
I
Page 30
PT500-2 Service Manual
30
54
BUSY
P04
I
AN3
Busy level input
55
TOPKEY
P62
I
L
TOPKEY input
56
RXMUTE
P61
O
H
RX audio mute
57
RSSI
P05
I
AN2
Received Signal Strength Indicator input
58
PCTV
P06
O
DA0
APC/BPF control output
59
AVSS
-
I
GND
60
DTMF
P07
O
DA1
DTMF/Beep output
61
VREF
-
I
+3V
62
AVCC
-
I
+3V
63
NC
P37
O
64
RX_W/N
P53
O
H
RX Wide/Narrow switch
Table 5.4 Functional description of semiconductor device
Item
Model
Function Description
IC1
MB15E03
Frequency Synthesizer
IC100
NJM2904
APC, Voltage Comparison, Driving
IC200
GT3136
Receiver 2
nd
Local Oscillation, 2nd IF Amplification,
Limitation, Demodulation, Noise Amplification
IC300
NJM2902V
Receiver demodulated signal Amplification, Filtering
IC500
NJM2100V
MIC Amplification, Limitation, Filtering
IC302
TDA2822D
Audio Frequency Power Amplification
IC401
W25Q80
FLASH, Channel Frequency Data Storage, Function
Setting Parameter, Debug Mode Parameter
IC403
R5F212BCSNFP
MCU
Chapter 6 PT500-2 PCB Layout
Page 31
Page 32
Page 33
Page 34
Page 35
PT500-2 Service Manual Chapter 7
ADJUSTMENT
7.1 Required Test Equipment
Table 7.1
Number
Name
Parameter requirements
1
Computer
Above P2, compatible IBM PC, WINDOWS
98/ME/2000/XPOperating System
2
Programming
software
PT500 Programming software
3
Programming
cable
Special Serial/USB (CPL-01) programming cable
5
DC regulator
Output voltage:7.5V, output electric current:≥ 5A
6
RF power meter
Test range: 0.5---10W
Frequency range: 100MHz—500MHz
Resistance: 50Ω 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
Test range: 0--±5kHz
9
DMM
Input resistance: above 10MΩ/V DC, capable of
measuring voltage, electric current and resistance.
10
Audio signal
generator
Frequency range:2---3000Hz Output
level: 1---500mV
11
RF power
attenuator
Decrement: 40db or 50db
Receive power : higher than10W
12
Standard signal
source
Frequency range:10MHz---1000MHz Output
level:0.1uV~32mV (-127dBm~-17dBm)
13
Oscilloscope
Frequency range: DC~20MHz
Test range: 10mV~20V
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
PT500-2 Service Manual
37
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. 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） VOX1(Tight)
（7） VOX10
（8） 2/5 tone deviation
（9） DTMF deviation
（10） MSK deviation
（11） DCS/LTR balance
（12） DCS deviation
（13） LSD deviation
（14） CTCSS(67.0Hz) deviation
（15） CTCSS(254.1Hz) deviation
（16） Battery warning level
（17） RX Sensitivity
（18） DCS RX middle level
（19） RX squelch 9 open level
（20） RX squelch 9 close level
（21） RX squelch 1 open level
（22） RX squelch 1 close level
（23） RSSI(-120dBm)
（24） RSSI(-70dBm)
Page 38
PT500-2 Service Manual
38
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.
7.3 Adjustment
7.3.1 VCO Adjustment
Close “Power-saving Mode”. Set receiving frequency to low frequency point (see Table 7.2)
and in the receiving state, test voltage of PD by DMM and adjust fine-tuning capacitor
TC1/TC2 to get CV voltage of 1.0V±0.2V
Set transmitting frequency to high frequency point (refer to Table 7.2), press PTT and test
voltage 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 MHz 469.975 MHz
7.3.2 Frequency stability
Double-click to enter “Frequency Stability” in “Test Mode Manual” to achieve the rated
transmitting frequency by adjusting the number from 0 to 255 (Error<100Hz).
7.3.3 RF transmitting power
High power
Adjusts the transmitting power to 3.8-4.2W in the computer (5
frequency points including Highest, High, Med, Low, lowest)
Middle Power
Adjust the transmitting power to 1.8-2.2W in the computer Low Power
Adjust the transmitting power to 0.8-1.2W in the computer
7.3.4 Voice deviation
Maximum voice deviation
Signal source: MOD:1kHz/120mV LPF:15kHz
Adjust the max frequency deviation in the computer adjustment mode. mode.
Page 39
PT500-2 Service Manual
39
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.
VOX1 for 50mv and VOX10 for 5 mv
7.3.5 CTCSS/DCS deviation DCS/LTR
balance
Signal source: LPF: 300Hz
Adjust DCS/LTR balance in the computer adjustment 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)
0.50kHz ---0.65kHz (medium band)
0.25kHz--0.45kHz (narrowband)
The waveform shall be good.
LSD deviation
Reserved for the future.
CTCSS(67.0, 254.1Hz) deviation
Signal source: LPF:300Hz
Adjust CTCSS deviation in the computer adjustment mode.
0.50kHz---0.85kHz (wideband)
0.50kHz ---0.65kHz (medium band)
0.25kHz--0.45kHz (narrowband)
The waveform shall be good.
7.3.6 Battery warning level
Adjust the battery warning level in the computer adjustment mode.
Set the power supply voltage at 6.8V, and press start and then end.
Page 40
PT500-2 Service Manual
40
7.3.7 Receive sensitivity
Adjust the sensitivity in the computer adjustment mode.
Make the sensitivity of all frequency points the highest
(provided the sensitivity is the highest, the better data)
7.3.8 Squelch adjustment Adjust squelch in the computer
adjustment mode.
Squelch 9 open
The signal level output is set to -118dBm (wideband) or -117dBm (narrowband)
Automatically records the corresponding squelch level.
Squelch 9 close
The signal level output is set to -120dBm(wideband) 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 squelch level
Squelch 1 close
The signal level output is set to -126dBm (wideband) or -125dBm (narrowband)
Automatically records the corresponding squelch level
7.3.9 RSSI adjustment
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
PT500-2 PARTS LIST
No. TP-PT5002
Ver 01C
No.
Parts No.
Description
Component
Name/Specificatio
n
Qt
y.
Ref. No.
1
Page 41
PT500-2 Service Manual
41
2
3
702PT5002001
PT500-2 UNIT
4
701PT5002001
PT500-2 portable
twoway radio
1
5
605PT5000201
PT500-2 packaging
BOM
1
6
71200CT02001
CT-02 radio ring
1
7
70700CP02001
CP-02 rapid charger
1
8
7100500240471
PT500U1 ANTENNA
(about 160mm)
CRAK435001010
400-470MHz
1
9
10
709CA02US001
Power Supply(DC
12V 500mA)
CA-02
1
11
70600CB05001
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 0Ω
RC0402JR-070R
6
R4 R7 R13 R419 R901
R911
18
1090410150001
0402 CHIP R 100Ω
RC0402JR-07100R
5
R19 R26 R210 R211
R530
19
1090415150001
0402 CHIP R 150Ω
RC0402JR-07150R
1
R27
20
1090433150001
0402 CHIP R 330Ω
RC0402JR-07330R
2
R108 R113
21
1090456150001
0402 CHIP R 560Ω
RC0402JR-07560R
1
R5
22
1090468150001
0402 CHIP R 680Ω
RC0402JR-07680R
1
R110
23
1090482150001
0402 CHIP R 820Ω
RC0402JR-07820R
2
R429 R532
Page 42
PT500-2 Service Manual
42
24
1090410250001
0402 CHIP R 1kΩ
RC0402JR-071K
16
R2 R9 R10 R222 R328
R407 R409 R413 R420
R427 R433 R434 R932
R951 R952 R967
25
1090415250001
0402 CHIP R 1.5kΩ
RC0402JR-071K5
4
R112 R331 R521 R525
26
1090418250001
0402 CHIP R 1.8kΩ
RC0402JR-071K8
4
R205 R329 R522 R908
27
1090422250001
0402 CHIP R 2.2kΩ
RC0402JR-072K2
5
R1 R226 R418 R536
R537
28
1090427250001
0402 CHIP R 2.7kΩ
RC0402JR-072K7
2
R422 R428
29
1090433250001
0402 CHIP R 3.3kΩ
RC0402JR-073K3
11
R100 R103 R105 R106
R203 R204 R303 R424
R425 R510 R548
30
1090439250001
0402 CHIP R 3.9kΩ
RC0402JR-073K9
1
R201
31
1090447250001
0402 CHIP R 4.7kΩ
RC0402JR-074K7
4
R32 R416 R607 R909
32
1090456250001
0402 CHIP R 5.6kΩ
RC0402JR-075K6
8
R101 R301 R302 R324
R326 R910 R914 R923
33
1090468250001
0402 CHIP R 6.8kΩ
RC0402JR-076K8
2
R523 R972
34
1090482250001
0402 CHIP R 8.2kΩ
RC0402JR-078K2
3
R339 R410 R426
35
1090410350001
0402 CHIP R 10kΩ
RC0402JR-0710K
16
R15 R33 R140 R308
R327 R432 R435 R501
R502 R503 R511 R516
R913 R920 R928 R964
36
1090412350001
0402 CHIP R 12kΩ
RC0402JR-0712K
2
R117 R312
37
1090415350001
0402 CHIP R 15kΩ
RC0402JR-0715K
3
R526 R527 R955
38
1090418350001
0402 CHIP R 18kΩ
RC0402JR-0718K
3
R305 R529 R919
39
1090422350001
0402 CHIP R 22kΩ
RC0402JR-0722K
7
R321 R500 R504 R506
R925 R927 R958
40
1090433350001
0402 CHIP R 33kΩ
RC0402JR-0733K
8
R508 R513 R514 R515
R519 R520 R929 R963
41
1090439350001
0402 CHIP R 39kΩ
RC0402JR-0739K
2
R313 R915
Page 43
PT500-2 Service Manual
43
42
1090447350001
0402 CHIP R 47kΩ
RC0402JR-0747K
11
R22 R107 R118 R126
R141 R307 R320 R330
R917 R921 R968
43
1090451350001
0402 CHIP R 51kΩ
RC0402JR-0751K
1
R524
44
1090456350001
0402 CHIP R 56kΩ
RC0402JR-0756K
2
R216 R605
45
1090468350001
0402 CHIP R 68kΩ
RC0402JR-0768K
1
R602
46
1090482350001
0402 CHIP R 82kΩ
RC0402JR-0782K
3
R11 R543 R918
47
1090491350001
0402 CHIP R 91kΩ
RC0402JR-0791K
1
R300
48
1090410450001
0402 CHIP R 100kΩ
RC0402JR-07100K
14
R6 R21 R146 R221 R318
R323 R325 R341 R401
R408 R533 R541 R603
R961
49
1090412450001
0402 CHIP R 120kΩ
RC0402JR-07120K
2
R30 R340
50
1090415420001
0402 CHIP R 150kΩ
RC0402DR-07150K
6
R134 R135 R136 R137
R138 R507
51
1090418450001
0402 CHIP R 180kΩ
RC0402JR-07180K
2
R202 R306
52
1090422450001
0402 CHIP R 220kΩ
RC0402JR-07220K
6
R322 R411 R414 R415
R421 R423
53
1090427450001
0402 CHIP R 270kΩ
RC0402JR-07270K
4
R16 R18 R316 R317
54
1090433450001
0402 CHIP R 330kΩ
RC0402JR-07330K
2
R8 R400
55
1090439450001
0402 CHIP R 390kΩ
RC0402JR-07390K
1
R315
56
1090447450001
0402 CHIP R 470kΩ
RC0402JR-07470K
6
R206 R309 R314 R333
R983 R984
57
1090468450001
0402 CHIP R 680kΩ
RC0402JR-07680K
3
R208 R912 R922
58
1090475450001
0402 CHIP R 750kΩ
RC0402JR-07750K
2
R505 R528
59
1090410550001
0402 CHIP R 1MΩ
RC0402JR-071M0
7
R142 R219 R228 R230
R231 R304 R950
60
1090418550001
0402 CHIP R 1.8MΩ
RC0402JR-071M8
1
R512
61
Page 44
PT500-2 Service Manual
44
62
1090600050001
0603 CHIP R 0Ω
RC0603JR-070R
5
L400 R120 R147 R311
R973
63
109064R750001
0603 CHIP R 4.7Ω
RC0603JR-074R7
2
R332 R959
64
1090610050001
0603 CHIP R 10Ω
RC0603JR-0710R
7
R3 R104 R115 R200
R334 R412 R417
65
1090622050001
0603 CHIP R 22Ω
RC0603JR-0722R
3
R109 R111 R218
66
1090647050001
0603 CHIP R 47Ω
RC0603JR-0747R
4
R121 R128 R212 R220
67
1090610150001
0603 CHIP R 100Ω
RC0603JR-07100R
3
R14 R31 R403
68
1090622150001
0603 CHIP R 220Ω
RC0603JR-07220R
2
R215 R402
69
1090627150001
0603 CHIP R 270Ω
RC0603JR-07270R
3
R102 R139 R154
70
1090647150001
0603 CHIP R 470Ω
RC0603JR-07470R
2
R535 R969
71
1090656150001
0603 CHIP R 560Ω
RC0603JR-07560R
1
R20
72
1090618250001
0603 CHIP R 1.8kΩ
RC0603JR-071K8
1
R534
73
1090622250001
0603 CHIP R 2.2kΩ
RC0603JR-072K2
1
R144
74
1090627250001
0603 CHIP R 2.7kΩ
RC0603JR-072K7
1
R209
75
1090610350001
0603 CHIP R 10kΩ
RC0603JR-0710K
2
R35 R214
76
1090647350001
0603 CHIP R 47kΩ
RC0603JR-0747K
2
R125 R338
77
1090668350001
0603 CHIP R 68kΩ
RC0603JR-0768K
1
R962
78
1090610450001
0603 CHIP R 100kΩ
RC0603JR-07100K
2
R601 R604
79
1090615420001
0603 CHIP R 150kΩ
RC0603DR-07150K
1
R133
80
1090618450001
0603 CHIP R 180kΩ
RC0603JR-07180K
1
R145
81
1090618550001
0603 CHIP R 1.8MΩ
RC0603JR-071M8
1
R517
82
83
1090700050001
0805 CHIP R 0Ω
RC0805JR-070R
1
R127
84
85
10910R3950001
1206 CHIP R 0.39Ω
RC1206JR-07R39
3
R130 R131 R132
86
87
1101147300001
Adjustable resistance
47kΩ
EVM2NSX80BQ4
47K
1
VR501
88
89
90
CAPACITOR
Page 45
PT500-2 Service Manual
45
91
112043P500091
0402 CHIP C 0.5pF
GRM1555C1HR50B
Z01D
2
C40 C49
92
1120431P00091
0402 CHIP C 1pF
GRM1555C1H1R0B
Z01D
2
C226 C238
93
1120431P50091
0402 CHIP C 1.5pF
GRM1555C1H1R5B
Z01D
1
C41
94
1120432P00091
0402 CHIP C 2pF
GRM1555C1H2R0B
Z01D
2
C29 C951
95
1120433P00091
0402 CHIP C 3pF
GRM1555C1H3R0B
Z01D
4
C45 C54 C233 C409
96
1120433P60091
0402 CHIP C 3.6pF
GRM1555C1H3R6B
Z01D
1
C38
97
1120434P00091
0402 CHIP C 4pF
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
GRM1555C1H7R0B
Z01D
1
C108
101
1120438P00091
0402 CHIP C 8pF
GRM1555C1H8R0B
Z01D
3
C219 C227 C229
102
1120439P00091
0402 CHIP C 9pF
GRM1555C1H9R0B
Z01D
1
C235
103
1120431005091
0402 CHIP C 10pF
GRM1555C1H100J
Z01D
7
C9 C14 C16 C36 C412
C415 C516
104
1120432205091
0402 CHIP C 22pF
GRM1555C1H220J
Z01D
2
C28 C100
105
1120433305091
0402 CHIP C 33pF
GRM1555C1H330J
Z01D
4
C35 C202 C212 C255
106
1120434705091
0402 CHIP C 47pF
GRM1555C1H470J
Z01D
1
C10
Page 46
PT500-2 Service Manual
46
107
1120435605091
0402 CHIP C 56pF
GRM1555C1H560J
Z01D
5
C208 C259 C338 C947
C948
108
1120436805091
0402 CHIP C 68pF
GRM1555C1H680J
Z01D
2
C51 C252
109
1120431015091
0402 CHIP C 100pF
GRM1555C1H101J
Z01D
6
C2 C3 C6 C31 C134
C910
110
1120432216091
0402 CHIP C 220pF
GRM155R71H221K
A01D
6
C205 C206 C529 C530
C531 C533
111
1120433316091
0402 CHIP C 330pF
GRM155R71H331K
A01D
2
C17 C26
112
1120434716091
0402 CHIP C 470pF
GRM155R71H471K
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 C410 C411 C414
C416 C427 C506 C517
C526 C528 C532 C601
C602 C604 C606 C607
C906 C927 C928 C938
C950 C957 C958 C966
C982
113
1120436816091
0402 CHIP C 680pF
GRM155R71H681K
A01D
2
C510 C513
114
1120431026091
0402 CHIP C 1000pF
GRM155R71H102K
A01D
13
C43 C116 C123 C314
C407 C521 C609 C610
C706 C912 C916 C922
C932
115
1120433326091
0402 CHIP C 3300pF
GRM155R71H332K
A01D
5
C500 C509 C512 C920
C929
116
1120433926091
0402 CHIP C 3900pF
GRM155R71H392K
A01D
1
C502
Page 47
PT500-2 Service Manual
47
117
1120434726091
0402 CHIP C 4700pF
GRM155R71H472K
A01D
1
C204
118
1120435626091
0402 CHIP C 5600pF
GRM155R71H562K
A01D
1
C308
119
1120436826091
0402 CHIP C 6800pF
GRM155R71H682K
A01D
4
C309 C501 C921 C930
120
1120438226091
0402 CHIP C 8200pF
GRM155R71H822K
A01D
1
C300
121
1120431036071
0402 CHIP C 0.01μF
GRM155R71E103K
A01D
34
C19 C20 C37 C128 C201
C214 C217 C220 C221
C305 C306 C312 C316
C330 C334 C336 C418
C420 C421 C422 C425
C508 C515 C603 C924
C934 C935 C936 C937
C939 C961 C962 C963
C967
122
1120431836071
0402 CHIP C
GRM155R71E183K
1
C301
0.018μF
A01D
123
1120432236071
0402 CHIP C0.022μF
GRM155R71E223K
A12D
2
C518 C520
124
1120432736051
0402 CHIP C0.027μF
GRM155R71C273K
A01D
1
C524
125
1120433336051
0402 CHIP C0.033μF
GRM155R71C333K
A01D
5
C318 C320 C321 C423
C503
126
1120434736051
0402 CHIP C0.047μF
GRM155R71C473K
A01D
3
C319 C511 C514
127
1120431046031
0402 CHIP C 0.1μF
GRM155R61A104K
A01D
31
C1 C4 C30 C58 C104
C113 C131 C156 C207
C209 C210 C211 C213
C256 C302 C303 C322
C327 C400 C419 C522
C525 C902 C905 C911
C914 C915 C918 C925
C943 C960
Page 48
PT500-2 Service Manual
48
128
1120431056031
0402 CHIP C 1μF
GRM155R61A105K
E15D
8
C310 C413 C903 C904
C923 C926 C949 C959
129
130
1120631P00091
0603 CHIP C 1pF
GRM1885C1H1R0B
Z01D
4
C135 C151 C154 C155
131
1120631P50091
0603 CHIP C 1.5pF
GRM1885C1H1R5B
Z01D
1
C149
132
1120632P00091
0603 CHIP C 2pF
GRM1885C1H2R0B
Z01D
3
C142 C144 C147
133
1120633P00091
0603 CHIP C 3pF
GRM1885C1H3R0B
Z01D
2
C136 C153
134
1120635P00091
0603 CHIP C 5pF
GRM1885C1H5R0B
Z01D
2
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
C145
138
1120634716091
0603 CHIP C 470pF
GRM188R71H471K
A01D
2
C114 L213
139
1120631026091
0603 CHIP C 1000pF
GRM188R71H102K
A01D
3
C39 C42 C119
140
1120631046091
0603 CHIP C 0.1μF
GRM188R71H104K
A01D
3
C331 C333 C335
141
1120634746051
0603 CHIP C 0.47μF
GRM188R71C474K
1
C931
A01D
142
1120631056051
0603 CHIP C 1μF
GRM188R61C105K
A01D
11
C126 C313 C417 C424
C429 C430 C504 C505
C535 C710 C969
143
144
1120732005091
0805 CHIP C 20pF
GRM2165C1H200J
A01D
1
C130
Page 49
PT500-2 Service Manual
49
145
1120731066031
0805 CHIP C 10μF
GRM21BR61A106K
14
C5 C23 C56 C127 C200
C304 C307 C332 C408
C519 C527 C940 C956
C970
146
147
1120721047081
CHIP-TAN 0.1μF P
TC211P104M035A
2
C12 C18
148
1120721057051
CHIP-TAN 1μF P
TEESVP1C105M8R
1
C15
149
1121021066051
CHIP-TAN 10μF A
TEESVA1C106K8R
1
C964
150
1121221077021
CHIP-TAN 100μF
TEESVB20J107M8
R
1
C337
151
152
1130110000001
CERAMIC TRIMMER
CAP 10pF
TZY2Z100A001R00
1
TC1
153
154
155
INDUCTOR
156
1170660100001
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
BLM21PG600S
1
L107
159
1140618N28001
SMALL FIXED
INDUCTOR 8.2nH
MLG1608B8N2S
1
L119
160
1140611505001
SMALL FIXED
INDUCTOR 15nH
MLG1608B15NJ
1
L102
161
1140611805001
SMALL FIXED
INDUCTOR 18nH
MLG1608B18NJ
2
L6 L101
162
1140612205001
SMALL FIXED
INDUCTOR 22nH
MLG1608B22NJ
4
L21 L100 L202 L212
163
1140712205001
SMALL FIXED
INDUCTOR 22nH
C2012C22NJ
1
L14
164
1140611015001
SMALL FIXED
INDUCTOR 100nH
MLG1608BR10J
2
L9 L11
165
1140712215001
SMALL FIXED
INDUCTOR 220nH
C2012CR22J
1
L109
Page 50
PT500-2 Service Manual
50
166
1140612215001
SMALL FIXED
INDUCTOR 220nH
MLG1608SR22J
4
L16 L17 L207 L901
167
1140713315001
SMALL FIXED
INDUCTOR 330nH
C2012CR33J
1
L200
168
1140624716001
SMALL FIXED
INDUCTOR 0.47μH
MLF1608AR47KT0
00
1
L4
169
1140715615001
SMALL FIXED
INDUCTOR 560nH
C2012CR56J
1
L201
170
1140625616001
SMALL FIXED
INDUCTOR 0.56μH
MLF1608DR56KT
1
L5
171
1140711025001
SMALL FIXED
INDUCTOR 1μH
C2012C1R0J
1
L2
172
1140623326001
SMALL FIXED
INDUCTOR 3.3μH
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
1030000137201
DIODE
1SS372
1
D500
178
1030000022201
DIODE
DAN222TL
1
D501
179
1030000013101
DIODE
HVU131TRF
1
D101
180
1030000211101
DIODE
MA2S111TX
2
D6 D7
181
1030000207701
DIODE
MA2S077
5
D1 D100 D102 D103
D200
182
1030019213201
LED(RED)
HT19-2132SURC-H
HH
1
D400
183
1030019213202
LED(GREEN)
HT19-2132SYGC
2
D401 D402
184
1030000035001
VARIABLE
CAPACITANCE
DIODE
HVC350BTRF
5
D201 D202 D203 D206
D905
185
1030000127801
VARIABLE
CAPACITANCE
DIODE
1SV278
1
D5
Page 51
PT500-2 Service Manual
51
186
1030000132501
VARIABLE
CAPACITANCE
DIODE
1SV325
2
D2 D4
187
188
TRANSISTOR、FET
189
1040002136201
TRANSISTOR
2SA1362-GR
3
Q305 Q406A Q406B
190
1040002461701
TRANSISTOR
2SC4617(S)
4
Q8 Q300 Q501 Q502
191
1040002498801
TRANSISTOR
2SC4988FRTR
1
Q102
192
1040002506601
TRANSISTOR
2SC5066-Y
7
Q1 Q2 Q6 Q100 Q101
Q201 Q503
193
1040000012301
TRANSISTOR
DTA123JE-TL
1
Q408
194
1040000014301
TRANSISTOR
DTA143ZETL
2
Q504 Q902
195
1040000014401
TRANSISTOR
DTA144EE-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
1040000000301
TRANSISTOR
UMG3NTR
2
Q404 Q407
199
1050000230201
FET
ST2302
1
Q307
200
1050002182401
FET
2SK1824
4
Q302 Q500 Q901 Q913
201
1050000001201
FET
RD01MUS2-T113
1
Q105
202
1050000004601
FET
RFM04U6P
1
Q107
203
1050000250801
FET
2SK508-T1B(K52)
1
Q4
204
1050000331801
FET
3SK318
2
Q202 Q203
205
206
IC
207
1020620130201
LDO
XC6201P302MR
2
IC2 IC404
208
1020620150201
LDO
XC6201P502MR
1
IC902
209
1020000150301
PLL IC
MB15E03SL
1
IC1
210
1020000258001
FLASH IC
W25Q80BVSIG
1
IC401
Page 52
PT500-2 Service Manual
52
211
1020000313601
FM IF
DEMODULATOR
GT3136
1
IC200
212
1020000521202
MICROPROCESSOR
R5F212B8SNFP
1
IC403
213
1020000210001
OPERATIONAL
AMPLIFIER
NJM2100V
1
IC500
214
1020000290201
OPERATIONAL
AMPLIFIER
NJM2902V
1
IC300
215
1020000290401
OPERATIONAL
AMPLIFIER
NJM2904V
2
IC100 IC301
216
1020000282201
AUDIO
PROCESSOR IC
TDA2822D
1
IC302
217
218
OTHERS
219
1221009830402
CHIP CRYSTAL
RESONATOR
[5032SMD(glass)]
1
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
ELFY450G
(or LTWC450G)
1
CF201
224
225
1080004502401
Discriminator
JTM450C24
1
CD200
226
1212602762201
MIC ELEMENT
PF0-6027P-62±2dB
1
MIC500
227
1102210300001
POWER SWITCH
RP08110SNAX-V02
-0000
1
VR401
228
1061001010001
ROTARY SWITCH
RE1001BA-V01-000
1
1
S401
229
1230525200801
SOCKET(φ2.5)
PJ-D2008K
1
J501
230
1230535302701
SOCKET(φ3.5)
PJ-D3027
1
J500
231
1010600200202
CU600 KEY PCB
CU600pttV03.PCB
1
232
1211361601001
SPEAKER
φ36 16Ω 1W
1
233
Page 53
PT500-2 Service Manual
53
234
235
236
STRUCTURE
237
2010PT500001A
PT500 radio front cabinet black
1
238
2010CU600002A
CU600 PTT plastic key black PC+ABS 2950
1
239
2010CU600003A
CU600 ear phone plastic plug black PC+ABS
2950
1
240
2010CU600004A
CU600 ear phone cabinet PC+ABS 2950
1
241
2010CU600005A
CU600 radio top cover black PC+ABS 2950
1
242
2010CU600006A
CU600 volume knob black ABS 700
1
243
2010CU600007A
CU600 encoder knob black ABS 700
1
244
2010CU600008A
CU600 ear phone cover black TPU
1
245
2010CU600009A
CU600 battery locker black PC+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 spring silicon
1
249
2020CU600004A
CU600 mic waterproof washer 60A 50% high
spring silicon
250
2020PT500002A
2 PIN power socket washer 60A 50% high
spring silicon
1
251
2020PT500003A
Φ7X1.5 waterproof ring high spring silicon
1
252
2020PT500004A
Φ5X1.5 waterproof ring high spring silicon
1
253
2030PT500001A
PT500 AL cabinet polishing ADC 12
1
254
2030CU600002A
CU600 battery metal locker polishing
SUS304
1
255
2030CU600003A
SMA RF socket
1
256
2030CU600004A
spring Φ2.3X10.5 Φ0.25 spring steel
Ni-plate
2
257
2040PT500001A
2 PIN power socket
1
J502
Page 54
PT500-2 Service Manual
54
258
2040CU600002A
CU600 PTT metal dome plate
1
259
306003301001A
Φ33mm air filter nylon weave
1
260
2040CU600004A
7mm mic air filter Φ7.0X4.5X0.2
1
261
304060250001A
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
machine screw M2.0X8.0 six lobe pan
Ni-plate nylok blue patch
2
265
301250607001A
machine screw M2.5X6.0 PB(+) black
Ni-plate
2
266
306006005001A
mic washer Φ6.0X0.5mm soft PVC
1
267
268
269
270
Page 55
PT500-2 Service Manual
55
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℃
9.3 Safety requirements
In accordance with safety requirements of CCC, CE and UL, etc.
9.4 Technical Specifications Current:
600±50mA
Max. charging 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 battery voltage reaches 6.4±0.1V, the charging turns to
rapid charging. When the battery voltage reaches 8.35V, the battery will be deemed as full
and the charging will be stopped.
Li-ion battery: pre-charging when the voltage < 6.4±0.1V, when the battery voltage reaches
6.4±0.1V, the charging turns to rapid charging.
Charging process checking: battery voltage, battery temperature rise, -△V, charging time,
max. Battery temperature
9.5 LED Status Table:
LED Status
RED
GREEN
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
Page 57
Page 58
Title PT500-
DIAGRAM
2 BLOCK
Date:Size A3 Number Sheet of Revision VER 1.0
File: Drawn By:
A
1 2 3 4 5 6 7 8
A
Page 59
Page 60
PT500-2 Service Manual
51
Appendix 1 Abbreviations
AMP (amplify, amplifier)
ANT （antenna）
APC （automatic power control）
BPF （band pass filter）
CTCSS （continuous tone control squelch system）
DCS （Digital code squelch）
DEMOD （demodulation）
HPF (high pass filter)
IDC (instantaneous 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 loop）
PTT （push-to-talk）
RX (receiver)
SPK (speaker)
TCXO （Temperature Compensated Crystal Oscillators）
TX （transmitter）
UL (un-lock)
VCO （voltage control oscillator）
Appendix 2: Main Technical Indexes
Technical Parameters
PT500-2
7.1 General Specification
Frequency
(400 ~ 470) MHz
Page 61
PT500-2 Service Manual
52
Number of channels
16 个
Channel separation
W:25 kHz /M:20KHz/N:12.5kHz
Working temperature
-30℃ ℃~ +60
Antenna Impedance
50Ω
Frequency Stability
±2.5ppm
Battery (Standard
Configuration)
Lithium-ion Battery: 1300mAh 7.4V
Dimension (W×L×H)
97.5 mm ×53.5 mm×31 mm
Weight
230g (With battery and antenna)
7.2 Receiving part
Sensitivity (12dB SINAD)
0.25μV(W) / 0.28μV(N)
Adjacent channel
selectivity
W:≥ 70dB / N:≥60dB
Intermodulation immunity
≥70dB(±50, 100kHz)
Audio Output Power
1W (16Ω)
Audio distortion
≤5%
7.3 Transmitting part
Transmitting Power
4W
Modulation Mode
F3E
Clutter and Harmonics
-36dBm ＜ 1GHz, -30dBm ＞1GHz
Residual FM
（300~3000Hz）
W:≤-45 dB / N:≤-40dB
Audio distortion
（300~3000Hz）
≤5%
Adjacent power
W:≥70dB / N:≥60dB
Max Frequency Offset
W:≤±5kHz / M:≤±4kHz /N:≤±2.5kHz
Appendix 3: Troubleshooting
No.
Problems
Solutions
Page 62
PT500-2 Service Manual
53
1
The radio cannot
be switched on or
no display after
switched on.
Battery pack may not be installed properly. Remove the
battery pack and install it again.
Battery power may be insufficient. Recharge or replace
the battery pack.
2
The battery power
consume quickly
after charging.
The battery life is finished; please replace it with a new
battery pack.
3
Cannot talk to or
hear other
members in your
group.
The frequency or CTCSS/DCS signaling are not identical
and please reprogram it.
Make sure the setting of the selective signaling 5-Tone in
he RX Squelch Mode is proper.
Beyond the radio efficient 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 signaling on the channel.
5
Communication
range is too small.
Make sure the antenna is well connected. Make sure
the antenna is the originally supplied one. Check if the
battery power is in the normal state. Ask your local
dealer to adjust the squelch level.
6
Unable to
transmit.
Make sure the PTT button has been pressed
completely.
Battery power may be insufficient. Recharge or replace
the battery pack.
Transmitting frequency has not been set on the channel
and the radio has been remote killed.
7
Noise is too loud.
Battery power may be insufficient. Recharge or replace
the battery pack.
Beyond the efficient communication range.
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