Kirisun PT260 Service Manual
PT260 Service Manual
Dangerous!
Do not connect AC power or DC power over 8.6V to any
connector or terminal of the radio. Otherwise it will cause fire,
electric shock or damage to the radio.
Warning!
Do not reverse the power polarity.
It may cause harm to the radio if signal input on the antenna
connector is higher than 20 dBm (100mW).
Do not turn on the radio until the antenna or load connection is
completed.
If the antenna has been damaged, do not use the radio.
Damaged antenna may cause light burning on skin.
Though the radio is waterproof, it's better to avoid putting it in
rain or snow, or any other liquid to ensure its life and performance.
Statement!
Shenzhen Kirisun Electronics Co., Ltd owns the copyright of
KSP260 software.
Duplication of KSP7800 software is allowed.
Shenzhen Kirisun Electronics Co., Ltd owns the copyright of
the MCU software code.
Shenzhen Kirisun Electronics Co., Ltd owns the copyright of
the radio outward appearance/structure/circuit design.
Shenzhen Kirisun Electronics Co., Ltd owns the copyright of
this service manual. Unauthorized publication is prohibited.
Shenzhen Kirisun Electronics Co., Ltd owns the trademarks
“KIRISUN”, “
”, “ ”, and “科立讯”.
Contents
Chapter 1 Overview ............................................................ 2
Chapter 2 External View and Functional Keys ................ 2
Chapter 3 Circuit Description ........................................... 3
Chapter 4 Function Description and Parameter Setting . 6
Chapter 5 Disassembly for Repair .................................... 9
Chapter 6 Adjustment ...................................................... 11
Chapter 7 Specifications ................................................... 14
Chapter 8 Troubleshooting............................................... 15
Chapter 9 KBC-260 Charger ........................................... 15
Appendix 1 Abbreviations ................................................ 16
Appendix 2 Electronic Parts Lists ................................... 17
Appendix 4 Accessories Lists ........................................... 21
Figure 1 PT260 Schematic Circuit Diagram................... 23
Figure 2 PT260 Top Layer Numeric Value Diagram ..... 24
Figure 3 PT260 Bottom Layer Numeric Value Diagram25
Figure 4 PT260 Top Layer Position Mark Diagram ...... 26
Figure 5 PT260 Bottom Layer Position Mark Diagram 27
Figure 6 Charger Schematic Circuit Diagram ............... 28
1
PT260 Service Manual
Chapter 1 Overview
1.1 Scope of Application
This manual applies to the service and maintenance of PT260
series of FM portable radios, and is intended for use by engineers
and professional technicians that have been trained by Kirisun.
Information that is needed in the maintenance all contain in this
manual. In order to improve the performance and quality of this
product, Kirisun owns the right to modify the structure and change
electronic parameters without first notice. For the latest service
manual, you can visit our website www.kirisun.com
or ask us or the authorized agencies to get it.
Please read this manual carefully before servicing this
product.
1.2 Attentions
Safety
Do not connect the antenna connector and PCB with your
skin during the servicing.
Do not reverse the power polarity.
It may cause harm to the radio if signal input on the antenna
connector is higher than 20 dBm (100mW).
Do not turn on the radio until the antenna or load connection is
completed.
If the antenna has been damaged, do not use the radio.
Damaged antenna may cause light burning on skin.
Electromagnetic Interference
Do not use or repair the radio in the following areas:
Hospital, health center, and airport.
Areas containing potentially explosive atmosphere, e.g. orlop
deck of the ship, storage and transportation equipment for fuel and
chemical.
Areas near blasting sites or with electrical blasting cap.
Avoid using or repairing the radio in the following areas:
In the moving car. Because the radio wave transmitted from
this product may probably cause the car stopping to work.
Replacement Parts
Make sure that you are using the parts provided by Kirisun
during the servicing.
Although you can purchase the parts with the similar type in
the market, we are not sure that those can be used on our product,
and we do not ensure the quality will not be changed.
If you require any replacement parts, please submit the blank
with the following format.
to download it,
Replacement Part Application
Product
Typ e
PT260 Field Effect
PT260 Triode Q41 2SC4181(L18) 1TT1-2SC4181 1
PT260 Belt clip KBJ-09 1
Part Name Part
No.
Q21 2SK3476 1TF1-2SK3476 1
Transistor
Parameters Material No. Pcs
1.3 Service
All the Kirisun products are subject to the service warranty.
The main unit of the radio is guaranteed for free service of 24
months. Accessories (such as battery pack, power adapter, antenna
or charger) are guaranteed for free service of 6 months. Earphones
are wearing parts and out of warranty.
In one of the following situations, charger free service will not be
available.
z No valid warranty card or original invoice.
z Malfunction caused by disassembling, repairing or
reconstructing the radio by users without permission.
z Wear and tear or any man-made damages such as mechanical
damage, burning or water leaking.
z Product’s serial number has been damaged or the product
trademark is difficult to identify.
After the warrant expires, lifetime service is still available.
We also provide service components to service stations and staffs at
favorable prices.
Chapter 2 External View and Functional Keys
2.1 External View
See figure below:
2
PT260 Service Manual
2.2 Functional Keys
① LED indicator
Red LED lights in transmitting; Green LED lights in
receiving. Red LED flashes in low battery warning.
② Channel selector
Rotate it to select channel 1-16.
③ Power ON/OFF/Volume knob
Rotate it clockwise until a click is heard to power on the radio.
Rotate it counterclockwise until a click is heard to power off the
radio. Rotate it to adjust the volume.
④ PTT button
Press it and speak to the microphone to send a call. Release it
to receive a call.
⑤ Monitor
Press it to turn off the squelch circuit, and then the user can
hear the background noise. Release it to turn on the squelch circuit.
⑥ Voice annunciation
In standby state, press this key and the radio will annunciate
the current channel number. Press it again to restart the radio and
change the type of annunciation.
⑦ Emergency button
Press this key and an alert tone sends out. Press it again to
turn off the alert tone. All the other switches and keys are invalid in
this state.
⑧ Speaker/Microphone jack
Use it to connect the external speaker and microphone.
Chapter 3 Circuit Description
3.1 Frequency Configuration
The receiver adopts single mixing. The first IF is 9.375 kHz.
The first local oscillator signal of the receiver is generated by
the frequency synthesizer. The transmitter signal is generated by
the frequency synthesizer.
The reference frequency of the frequency synthesizer is
produced by TXCO.
3.2 Principle of Receiver (RX)
3A
BATT
1
23
POWER
AFCN
5T
RF
ANT SW
FROM TX
AF
W558
5M
MUTE
MUTE
CLK FR OM MCU
DATA FROM MCU
DTMF/BEEP FROM MCU
BUSY T O MCU
RDA1845
AMP
5R
AF
AMP
5C
SW
4
5
GND
AF
MUTE
MUTE
AF POWER AMP
GND
AF
POWER
sw
SPK JACK
2
2
2
4
4
3
3
1
1
TXD
Figure 3.1 Receiver Diagram
Receiver Front End
The signal coming from the antenna passes through the
RX/TX switch circuit (D11, D12, D21, D17), and sends into IC1
(RDA1845) to demodulate, and then output audio signal.
RX Audio Signal Process
The audio signal demodulated by IC1 (RDA1845) passes
through the volume potentiometer, and comes to audio power
amplifier U31 (TA7368F).
Squelch Circuit
The third pin of IC1 (RDA1845) sends out signal to MCU
which can identify the noise level and control the squelch circuit.
Audio Power Amplifier
IC1 and the periphery components consist of BTL audio
power amplifier circuit.
Base electrode of Q31is the control end. High level: On; low
level: Off.
Receiving audio signal, voice annunciation signal, alert tone
signal and emergency alarm signal gather together and are
amplified by audio amplifier to drive the speaker. Among these
signals, the emergency alarm cannot be adjusted by the volume key.
The impedance of the speaker is 8 Ω.
CTCSS Process
rd
The 33
pin of IC1 (RDA1845) outputs CTCSS/CDCSS signal to
MCU to decode.
3.3 Transceiver (TX) Principle
TX Amplifier
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PT260 Service Manual
5T
PRE
RDA1845
DRIVER
RF PA
DRIVER
5T
POWER SUPPLY
ANT SW
RF PA
APC
SW
APC
CONTROL
CURRENT
SENSING
APC FR OM MCU
Figure 3.2 Power Amplifier and Antenna Switch Diagram
The modulated RF signal from IC1 (RDA1845) is amplified
by Q19 and Q22, and then is sent to Q21 for power amplifier. The
output power of Q21 is 4.5W.
Grid bias of Q21 and Q22 is controlled by the APC circuit.
By changing the voltage of grid bias, the TX output power can be
controlled conveniently.
APC (Automatic Power Control)
POWER SUPPLY
APC
SW
APC
CONTROL
CURRENT
SENSING
APC F ROM MCU
Figure 3.3 APC Circuit Diagram
R231, R232 and R233 are used to test the power amplifier
current. IC3A is the sampling amplifier for the power amplifier
current. IC3B is the power comparator amplifier.
If the TX output power is too high, the power amplifier
current and IC5A output voltage increase; IC5B output voltage
decreases, and the offset voltage added to Q21 and Q22 decreases,
which cause the TX output power decreases and vice versa. Thus,
the TX output power can keep stable under different working
conditions.
By changing the voltage inputting to IC5B, the MCU can
adjust the power.
TX Voice Signal Process
MIC signal passes through the inner and outer MIC Switch
Circuit. This signal first is sent to U32U for filter and amplifier, and
then is sent to the 5
th
pin of IC1 (RDA1845) for carrier modulation.
3.4 Principle of Frequency Synthesizer
13MHz reference frequency signal provided by X1 is sent to
the internal reference divider of IC1 (RDA1845) for division, and
then is sent to the internal discriminator and the internal VCO to be
divided by decimal fraction divider, and then this signal comes to
phase comparator. The internal VCO is controlled by the output
control signal to make the frequency of VCO equals to the
designed frequency.
3.5 V oice Annunciation Circuit
This product has voice annunciation function, which is
especially useful at night or in the dark environment.
IC2 is the voice storage chip, which stores voices such as
channel annunciation and so on. When switching to the next
channel, the radio will annunciate the current channel number.
When pressing “Voice Annunciation” Key, the radio will
annunciate the channel number again.
If Voice Annunciation is enabled, press “Voice Annunciation”
Key in the standby state, the radio will annunciate the current
channel number. Press and hold that key to restart the radio and
change the type of voice annunciation. When repressing the key to
restart the radio, the radio will annunciate again and again in the
order of “Chinese woman voice-English woman voice-no sound”.
3.6 Power Supply
The radio uses 7.4V, 1100mAh Li-on battery as the power
supply. The transmitter power amplifier circuit (Q21, Q22) and the
receiver audio power amplifier (U31) directly adopt the battery for
power supply. Other circuits are powered by 3V regulated voltage.
IC6: 3V low dropout, micro-power regulator, supplies 3V
voltage for the radio.
Q12: 3T switch, controlled by MCU.
3T: Supplies power for front end of the TX.
Q27: 3R switch, controlled by MCU.
3R: Supplies power for RF amplifier, mixer, IF processing
unit, and audio signal processing unit etc. of receiver.
3.7 MCU Unit
ENCODE R KEYS
CLK LE
APC
WDATA
MUTE
PABC
G/R LED RDA 1845
3RC
WSCLK
TXD
3TC
CFA
3M
MCU
EEPROM
3M
KEYAD
RXD
M30C026FPG#U0
PTT
MODE
BATT
SQL
QTIN
SHIFT QTOUT
DTAT
AFCO
W558C
7.3MHz RES ET
3M
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PT260 Service Manual
Figure 3.4 MCU Unit Principle Diagram
MCU unit controls the operation of each unit of the radio so
as to realize all the functions.
Communicate with external PC.
Access the status data of the radio.
Control RDA1845 Rx and Tx.
Obtain the status of the current channel.
Control the status of LED indicator.
Control power supply of each unit.
Check the actions of each functional key.
Generate DCS signal.
Generate power control signal.
Perform CTCSS decoding.
Perform DCS decoding.
Test and control the squelch.
Control content of voice annunciation.
Memory (E
2
PROM, AT24C08)
The memory stores the channel data, CTCSS/DCS data, other
data for function setting and parameter adjusting data.
CTCSS/DCS Signal Encoding and Decoding
The CTCSS/DCS signal (output from pin 17, PWM wave)
generated by MCU passes through R624, R623, C616 and C617
filter and is sent to RDA 1845 for modulation.
The CTCSS/DCS signal from the receiver is sent to MCU for
modulation. The MCU will judge whether the CTCSS/DCS signal
in the receiver matches with the preset CTCSS/DCS signal of the
radio, and determines whether to turn on the speaker or not.
CTCSS
CTCSS（Continuous Tone Control Squelch System, CTCSSS
for short）is the squelch control system which is modulated on the
carrier, and uses the continuous sub-audio signal as the guide
frequency. If CTCSS is set, the communication between the
transmitting and receiving radios can be realized only when the two
radios have set the same CTCSS frequency. In doing this,
disturbance from other signals can be avoided.
This radio has 39 groups of standard CTCSS frequencies for
your selection (these CTCSS frequencies are compatible with any
of the CTCSS within 67-254.1Hz). See table 3.1.
The CTCSS signal (PWM wave) generated by MCU passes
through the low pass filter consisted of by RC to remove high
frequency components (above 300Hz). Then the resulting signal is
sent to VCO for modulation.
Table 3.1 CTCSS Frequency List
No. Frequency
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
[Hz]
No. Frequency
[Hz]
No. Frequency
[Hz]
No. Frequency
[Hz]
DCS
DCS (Digital Code Squelch), which is used to control
squelch, is a series of continuous digital codes modulated on the
carrier together with voice signal. If DCS is set, the speaker can
only be opened when the radio receives signal with the same DCS
to avoid disturbance of unwanted signals.
This radio has 83 standard codes (normal and inverse) for
your selection. See table 3.2.
DCS signal (PWM wave) is generated by MCU. It passes
through the low pass filter consisted of by RC to remove high
frequency components (above 300Hz), and then the processed
signal is sent to VCO and TCXO for modulation, with HF
components of the DCS signal being modulated by VCO, and the
LF components of the DCS signal being modulated by TCXO.
The DCS signal coming from the receiver is sent to MCU for
decoding. MCU checks if the DCS code in the received signal
matches the preset DCS of the radio, and determines whether to
open the speaker or not.
Table 3.2 DCS Codes
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
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PT260 Service Manual
3.8 Semiconductor Components
MCU Description
Table 3.3 Description for Port of Microprocessor
(M30C026FPG#U0)
Pin No. I/O Port Name Function
1. NC Null pin
2. I EDATA E
3. O ECLK E
2
PROM data
2
PROM clock
4. NC Null pin
5. I MODE Used for downloading
programs
6. NC Null pin
7. NC Null pin
8. I RESET Reset
9. O X2 internal oscillator pin
10. GND GND
11. I X1 Internal oscillator pin
12. VCC Power supply
13. NC Null pin
14. NC Null pin
15. I CTCSSIN CTCSS/CDCSS input
16. O 3TC Tx power control
17. O CTCSSOU
CTCSS/CDCSS output
T
18. O CFA Center frequency control
19. O APC Automatic power control
20. I SQL Squelch check
21. O RPDN RDA1845 power saving
enable
22. NC Null pin
23. O RDAEN RDA1845 data lock and
storage
24. O RDACLK RDA1845 clock
25. I/O RDADATA RDA1845 data
26. NC Null pin
27. I RINT RDA1845 interrupt
28. O TXD Serial port data Tx
29. I RXD Serial port data Rx
30. O MUTE Mute control
31. O MAXAF Max. audio power control
32. O AFCO Audio power amplifier power
supply control
33. O BEEP Alert tone output
34. O 3RC Rx power supply control
35. I ECO3 Channel encode switch
36. I ECO2 Channel encode switch
37. I ECO1 Channel encode switch
38. I ECO0 Channel encode switch
39. NC Null pin
40. NC Null pin
41. O GLED Green LED control
Pin No. I/O Port Name Function
42. O RLED Red LED control
43. AD BATT Battery voltage check
44. I VREF ADC reference voltage
45. I PTT PTT button check
46. NC Null pin
47. O W558C Voice annunciation IC control
48. I KEYAD Button check
49. NC Null pin
50. NC Null pin
51. O WDATA Voice annunciation IC data
52. O WCLK Voice annunciation IC clock
Chapter 4 Function Description and Parameter
Setting
4.1 Main Functions
4.1.1 16 channels/15 channels + scan channel
This radio has 16 channels, and can be chosen to work as 15
channels + one scan channel.
4.1.2 Automatic scan channel (which can be prohibited by the
program software)
When the channel selector rotates to the 16
radio comes to the scan mode. The scan will stop at one channel
when the signal is received.
When the channel selector rotates to any of the channel in
1-15 channels, the scan is disabled.
Descriptions:
The methods to restart the scan are as follows:
1. Time control:
2. Carrier control:
Press PTT button when the radio is scanning, there are 8 options to
select the working channel:
1. The last receiving channel
Press PTT button, the radio will transmit the signal on the last
receiving channel.
2. The last receiving channel + the currently working channel
During the scan, press PTT button, the radio will transmit the
signal on the last receiving channel; if the scan stops at one channel,
press PTT button, the radio will transmit the signal on the currently
working channel.
3. Selected channel
Press the PTT button, the radio will transmit the signal on the
first channel of the scan list.
4. Selected channel + the currently working channel
6
th
channel, the
PT260 Service Manual
During the scan, press the PTT button, the radio will transmit
the signal on the last receiving channel; if the scan stops at one
channel, press the PTT button, the radio will transmit the signal on
the currently working channel.
5. Priority channel (The priority channel must be set first)
Press the PTT button, the radio will transmit the signal on the
priority channel in the scan list.
6. Priority channel + the currently working channel (The priority
channel must be set first)
During the scan, press the PTT button, the radio will transmit
the signal on the priority channel in the scan list; if the scan stops at
on channel, press the PTT button, the radio will transmit on the
currently working channel.
7. The last transmitting channel
Press the PTT button, the radio will transmit on the last
transmitting channel.
8. The last transmitting channel + the currently working channel
During the scan, press the PTT button, the radio will transmit
the signal on the last transmitting channel; if the scan stops at on
channel, press the PTT button, the radio will transmit on the
currently working channel.
Note: The currently working channel is the channel at which the
radio stops in the following situations:
1. The radio receives the signal and stays at the channel before the
scan restarts. This channel is the currently working channel.
2. The radio receives the signal and stays at the channel before the
signal disappears. This channel is the currently working channel.
3. Press the PTT button to transmit, the radio will stay at the
channel. This channel is the currently working channel.
4. Release the PTT button to end the transmission, the radio will
stay at the channel before the “Transmitting Pause” time is over.
This channel is the currently working channel.
4.1.3 CTCSS and DCS
CTCSS/DCS is a kind of sub-audio and digital sub-audio
signal, which can realize the function of call selection and group
call. On one channel, the communication can only be realized when
the radios have the same CTCSS/DCS code. CTCCS/DCS code is
preset.
4.1.4 TOT Transmitting Timeout
TOT can prevent the user from continuously talking overlong
and prevent the current channel from being occupied overlong so as
to affect the group communication.
If you continuously transmit longer than the preset TOT time,
the radio will stop transmitting and make an alert tone. To stop the
warning tone, release the PTT button.
4.1.5 TOT Pre-alert
The radio will make an alert tone in advance before the TOT
terminates the transmission. If the continuous transmitting time
exceeds the time preset by the dealer, the radio will send out an
alert tone, but the communication can be continuing until the TOT
time is over.
4.1.6 TOT Repress
The function can be set to stop transmitting after the TOT
time is over. When the TOT time is over, and press the PTT button
again during the pre-set time, the radio will send out an alert tone
and stop to transmit.
4.1.7 TOT Reset
This is the interval between the pre-set TOT time is over and
the time to release the PTT button and reset the timer. If the time to
release the PTT button is shorter than the reset time, the TOT
continues to count down.
4.1.8 Automatic Battery Saving
When the radio does not receive the signal or no operation is
done above 8 seconds, the battery saving function will be enabled.
This function will be disabled when the radio receives the signal
and the transmission is going on. There are two means to save the
battery: long time saving and short time saving. The long time
saving will prolong the standby time.
4.1.9 Low Battery Warning
When the battery voltage is very low, the LED indicator
flashes. If the battery voltage is lower than the pre-set value during
the transmission, Red LED indicator flashed. When a sound of “Du
Du” is heard, the radio stops transmitting.
4.1.10 Monitor
If no signal is received, the radio will enable the squelch
circuit to mute the speaker. Thus, the user cannot hear the
background noise.
Press the “Monitor” Key to disable the squelch circuit. Then
the speaker will send out a continuous alert tone (regardless of the
signal is received or not). The function is very useful when you
adjust the volume or the receiving signal is very weak (The voice
7
PT260 Service Manual
will be intermittent when the signal is very weak).
Press the “Monitor” key, Green LED indicator lights, and the
radio is in monitor state.
4.1.11 Busy Channel Lockout
If BCL is enabled, the radio cannot transmit on the busy
channel. Press the PTT button on the busy channel, an alert tone
sends out, and the transmission is disabled.
4.1.12 PC Program
The user can set the functions and adjust the parameters of
the radio through the program software KSP260.
4.1.13 Wired Clone
The data stored in the radio can be transmitted to the radio
with the same type with the wire.
4.1.14 Squelch Circuit Level
The squelch circuit is used to mute the speaker when no
signal is received or the receiving signal is very weak. If enabled,
the sound from the speaker will be heard; if disabled, no sound will
be heard. The squelch level determines when the squelch can be
turn on or off during the receiving. If the squelch level is set too
high, the weak signal cannot be received completely; if it is set too
low, your radio will often be interrupted by the noise or other
irrelevant signals. The squelch level can be set to 0-9.
4.2 Functional Parameters Setting (PC mode)
The radio has set the factory settings before leaving the
factory. However, due to the user’s different needs to the radio, the
user may reset the working frequency, channels, CTCSS/DCS and
automatic scan etc, of the radio. Thus, Kirisun has specially
designed a set of Chinese/English programming software KSP260
with friendly interface, convenient operation and visualized display
for setting functional parameters of the radio.
Steps for setting the functional parameters of the radio by
computer are as follows:
a. Install KSP260on the computer.
b. Connect the radio to the serial port of the computer with the
special programming cable. The method refers to the figure 4.1.
PC
（RS232 serial port）
Programming cable
（KSPL02）
Radio
（Speaker/Mic jack）
Figure 4.1
c. Turn the computer power ON.
d. Turn the radio power ON.
e. Double click KSP260.exe to run the software.
f. Click “Read” in the main menu of KSP260 to read parameters of
the radio to the computer; click “Write” to write parameters in the
computer to the radio.
g. The following parameters can be set by using KSP7800
according to requirements of the user:
1) The Rx and Tx frequency of each channel
2) The Rx and Tx signaling of each channel
3) Busy Channel Lockout
4) TOT
5) Squelch level
6) Battery saving
7) Monitor
8) Scan
9) Scan revert channel
10) Scan priority channel
Please refer to the “Help” document of KSP260 for details.
Note:
1. Before connecting, please turn the radio power OFF.
2. When the computer reads the data from the radio, Red LED
indicator flashes and operation to the PTT button is forbidden;
when the computer inputs the data to the radio, Green LED
indicator flashes.
3. Before the edit, you should read out the data in the radio and
backup them.
4. If the radio cannot work after the edit, please open the backup
data and reedit them.
5. “Model Information” contains important information about the
radio and is unchangeable.
4.3 Test Mode
Connect the radio to the serial port of the computer with the
special programming cable (see figure 4.1).
Attention: Please connect 50Ωhigh frequency load to the
antenna connector of the radio or connect the radio to the
comprehensive test equipment before test.
The following parameters can be set under the test mode by
KSP260:
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