Kirisun PT7200 Service Manual

PROFESSIONAL
TWO-WAY RADIO

PT7200

FM PORTABLE RADIO
SERVICE MANUAL

V071215

PT7200 SERVICE MANUAL

DANGEROUS!!

Do not connect the AC power or DC power over 7.4V

with any connector or terminals of the radio. Otherwise it will

cause fire, electric shock or damage to the radio.

WARNING

Do not reverse power connection.

It may cause harm to the radio if signal input on the

antenna connector is bigger than 20 dBm (100mW).

Do not turn on the power before the antenna or load

connection is completed.

If the antenna has been damaged, do not use the radio.

Damaged antenna may cause lightly 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.

Contents

Chapter 1 Introduction.....................................................................1

Chapter 2 Radio Overview and Function Keys................................1

Chapter 3 Electric circuit..................................................................2

Chapter 4 Function Description and Parameter Setting..................6

Chapter 5 Service Assemble and Disassemble...............................8

Chapter 6 Radio Debugging..........................................................10

Chapter 7 Major Specifications......................................................11

Chapter 8 Trouble Shooting...........................................................12

Chapter 9 KBC-70C Charger.........................................................13

Appendix 1 Abbreviations..............................................................14

Appendix 2 Spare List....................................................................15

Appendix 3 Framework Component List........................................15

Appendix 4 Electronic Component List..........................................16

Appendix 5 Accessory List.............................................................26

Figur 1 PT7200 Schematic Circuit Pane Diagram......................

Figur 2 PT7200 Schematic Circuit Pane Diagram.......................28

Figure 3 PT7200Top Board Position Mark Diagram......................29

Figure 4 PT7200 Bottom Board Position Mark Diagram................30

.27

STATEMENT

Kirisun Electronic (Shenzhen) Co., Ltd owns the

copyright of KSP7200 software.

Unauthorized Duplication of KSP7200 software is strictly
prohibited.

Kirisun Electronic (Shenzhen) Co., Ltd owns the
copyright of the MCU software.

Kirisun Electronic (Shenzhen) Co., Ltd owns the
copyright of the radio outward/structure/circuit design.

Kirisun Electronic (Shenzhen) Co., Ltd owns the
copyright of this service manual. Unauthorized publication
is prohibited.

Kirisun Electronic (Shenzhen) Co., Ltd owns the
trademarks KIRISUN , , .

Figure 5 KBC-70CSchematic Circuit Diagram...............................31

Figure 6 KBC-70CSchematic Circuit Diagram...............................32

Figure 7 KBC-70CSchematic Circuit Diagram...............................33

PT7200 SERVICE MANUAL

Chapter 1 Introduction

1.1 Introduction

This manual applies to the service and maintenance of PT7200
series of FM portable radios, and is designed for the engineers and
professional technicians that have been trained by Kirisun. In this
manual you can find all the information of product service. Kirisun
reserves the rights to modify the product structure and specification
without notice in order to enhance product performance and quality.
You can also log on our website www.kirisun.com to download the
latest service manual or contact your local dealer or us.

Read this manual before repairing the product.

1.2 Service Precautions

Safety

Avoid skin contacting with the antenna connector and PCB.

Do not reverse the power polarities.

If signal input at antenna connector is bigger than
20dBm(100mW), it may cause damage to the radio.

Do not turn on the power before the antenna and load
connection is completed.

Do not use the radio if the antenna has been damaged.
Contacting the damaged antenna will cause slightly 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 (where the air
contains gas, dust and smog, etc.), such as the storage or
transportation facilities of fuel or chemicals.

Any area of dynamite or exploder.

It's recommended to avoid using or repairing the radio in the
following places:

It's recommended to avoid using the radio in a car that is
moving. The radio wave might interfere the auto engine and cause it
to stop working.

Component Replacement

All the components used in repair service should be supplied by
Kirisun.

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.

Please fill in a component application forms if you want to apply
for any components from Kirisun.

The following is one sample form that might be used to apply
for any components from Kirisun.

Component Application

Radio M o del/
Model
PT7200-01 FET Q68 RD07MVS1 105-RD07MV-001 1
PT7200-01 Triode Q57 2SC5108(Y) 104-SC5108-001 1

months. Accessories (such as battery pack, power adapter, antenna
or charger) are guaranteed for free service of 6 months. Earphones

Compo
nent

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 18

No.

pecifications

S

Mat e r i a l Serial

No.

Qua

ntity

are wearing parts and out of warranty.

In one of the following situations, charge-free service will not be

available.

No valid service warranty or original invoice.
Malfunction caused by disassembling, repairing or

reconstructing the radio by the users without permission.

Wearing and tearing or any man-made damage such as

mechanical damage, burning or water leaking.

Product serial number has been damaged or the product

trademark is difficult to identify.

After the warranty expires, lifetime service is still available. And
we also provide service components to service stations and service
staff.

Chapter 2 Radio Overview and Function Keys

2.1 Radio Overview

Figure2-1

LED Indicator

Lights red while transmitting signals; lights green while receiving

signals.

Flashes red while in low battery power during transmitting.

Channel Selector

Rotate it to select channel 1-16.

Power/Volume Switch

Turn clockwise till a click is heard to switch on the radio.
Turn counterclockwise till a click is heard to switch off the radio.
Rotate it to adjust the volume after turning on the radio.

PTT (Push-to-talk)

To make a call, press and hold the PTT button, then speak into

the microphone in normal voice.

Release the PTT button to receive a call.

Side key 1

Programmable function button: Press it to activate the

programed auxiliary function.

Side key 2

Programmable function button: Press it to activate the

programed auxiliary function.

Top Button

Programmable function button: Press it to activate the

programed auxiliary function.

Microphone/Speaker Jacks

For connecting the optional Microphone/Speaker.

1

PT7200 SERVICE MANUAL

Chapter 3 Electrocircuit

3.1 Frequency Configuration

This radio receiver adopts the 2 Mixer, the 1 IF 51.65MHz,

nd

the 2 IF 450kHz.

The receiver's first local oscillation is generated by the
frequency synthesizer, the 2 local oscillation selects the 4
harmonic wave 51.2MHZ of TCXO.

The transmitter signal is generated by the
synthesizer.

The standard frequency of the frequency synthesizer is
generated by TCXO.

Figure 3.3 Frequency structure

nd st

nd th

frequency

3.2 Receiver Elements (RX)

as the 2 local oscillation signal source after amplification. The 2
local oscillation (51.2MHz) and the 1 IF signal (51.65MHz) are
mixed at U9 to generate the 2 IF (450MHz). After the 2 IF signal

nd nd

st

nd nd

is amplified and its amplitude is limited inside U9, and then filtered
at porcelain filter (wideband CF4/Nattowband 3, 450kHz) and then
sent to U9 to demodulate the output audio signals which are finally
output from the 9 pin of U9.

th

Figure 3.5 IF System

Receiver Audio Signal Processing

IC13, IC12, IC16, IC15 and their peripheral circuit compose the
receiver audio signal processing circuit. After being sent to IC13
from U9 for amplification Audio, the audio signal is sent to IC15
CTCSS signaling filter circuit for waveform shaping and then sent to
MCU; and it is simultaneously sent to IC12 and through IC12
amplification, deemphasis, filtration to remove high frequency and
low frequency elements in the audio, only audio components of
300--3000Hz are kept to be sent to audio power amplifier (U9) after
volume potentiometer adjustment, and simultaneously sent to MCU
through IC15 (2 tone/5 tone filtration circuit).

Figure 3.4 Receiver Illustration

The receiver front terminal

Signals from the antenna pass through the low pass filter
consisting of L104, C546, L103, C545, L102, C534 and the RX/TX
switch (D51); and then undesirable out-of-band signals will be
filtered out at the band pass filter (BPF) consisting of L104, C546,
L103, C545, L102, C534; then signals are amplified at the low noise
amplifier (LNA) consisting of Q81 and its peripheral components.

The output of LNA is sent to the first mixer (Q79) through the
BPF filter consisting of L115, C541, D63, C528, C591, L114, D62,
C527, C590, L113, D60 and C526.

The First Frequency Mixer

After mixing the receiving signals and the first local oscillation
signals from the frequency synthesizer, the 1 IF signals (51.65MHz)
are generated. The 1 IF signals pass the crystal filter (XF2), which

st

st

will filter the signals of adjacent channel and those out of band, and
are sent to the IF amplifier.

IF Circuit

The IF signals from the crystal filter are amplified at the 1 IF

st

amplifier (Q78), and then are sent to the IF processing IC (U9,
TA31136FN). The IF IC consists of the 2 frequency mixer, the 2

nd nd

local oscillator, IF amplifier, limiter, phase frequency detector, and
noise amplifier.

TCXO (X4, 12.8MHz) selects the 4 harmonic wave 51.2MHZ

th

2

Figure 3.6 Receiver Audio Processing

Squelch Circuit

The audio signal output from the demodulation of U9 is sent
back to U9 internal noise amplifier and composes the frequency
selection noise amplifier together with C320, Q77, R167, C439 and
C319. Filtered from the demodulation signals, the noise is changed
into DC level by D57 demodulation after amplification by Q77 and
then sent to MCU, which distinguishes the noise volume so as to
decide whether to enable the squelch, which achieves the control of
the squelch.

Audio Power Amplifier

Q92 and peripheral compose the BTL-audio and power
amplifier.

The audio receiving signals, voice indication signals, indication
tone signals and warning tone signals are converged to be
amplified by the audio power amplifier to drive the speaker.

Speaker impedance: 16Ù

Q95: Receiving audio signal switch

Note: No terminal of the speaker can be grounded!

CTCSS signaling filter

The U9 Demodulation output audio signals may contain CTCSS
(continuous tone coded squelch system) or DCTCSS (Digital coded
squelch) signals. The frequency spectrum of CTCSS/DCS is 20­250Hz. The filtering circuit constructed by IC16can filter out the
signals out of the CTCSS/DCS frequency spectrum to ensure MCU

to decode CTCSS/DCS more precisely.

3.3 Transmitter (TX)

Transmitter Power Amplifier

Figure 3.7 Amplifier and antenna switch diagram

The modulated RF signals from VCO are amplified at Q60, Q66,
Q67 and then are sent to Q68 for power amplification. Q68 output
power: 4.5W.

The Q67, Q68 grid offset is controlled by APC circuit. Changing
the grid bias can control the transmitter output power conveniently.

APC (Auto Power Control)

Figure 3.8 APC Circuits

R512, R513, R514 are the amplifier current checker; IC10A the
sample amplifier of the amplification current. IC10B is the power
comparison amplifier.

If the transmitter output power is too high, the amplifier current
will increase, IC10A output will mount, IC10B output voltage
decrease, the offset voltage added to Q67 and Q68 will decrease,
and then the transmitter output power will decrease. Vice versa,
such can ensure steady transmitter output power in different
working circumstances.

MCU changes the voltage input to IC10B to set the power.

Transmitter Audio Signal Processing

PT7200 SERVICE MANUAL

Figure 3.10 Frequency Synthesizer

The radio adopts Phase Locked Loop (PLL) frequency

synthesizer.

The frequency synthesizer consists of standard oscillator,
voltage controlled oscillator (VCO), programmable frequency
demultiplier, phase comparator, and low pass filter.

IC9 (ADF4111) is PLL integrated circuit, including
programmable reference frequency demultiplier, programmable
frequency demultiplier, phase comparator, and charge pump.

R334, C464, R333, R311, C448, C484 and R336 construct the
low pass filter.

The standard frequency is supplied by X4 (TCXO, 12.8MHz).

The standard frequency from TCXO (Temperature Control
Transistor Oscillator) is demultiplied by the programmable reference
frequency demultiplier at IC9 to acquire 6kHz or 6.5kHz reference
frequency (controlled by MCU according to the preset channel
frequency).

The oscillation frequency from VCO is sent to IC1, and
demultiplied by programmable frequency demultiplier and
compared with reference frequency to acquire the error signals.
Then pass the low pass filter and are sent to VCO to change VCO
oscillation frequency to the preset value, and then VCO is locked.

N=F /F

N: Frequency demultiplication times

F : VCO oscillation frequency

F : Reference frequency

Check Loss of Lock: When PLL is in loss of lock, IC pin14
sends out low level signals to MCU, which controls the transmitter
not to transmit and initiate warning tone.

3.5 Voice Prompt Circuit:

The radio features voice prompt, which is very useful at night or
in the environment of dim light.

The internal memory IC of MCU is provided with voices like
channel indication, etc., each time switch a channel, the speaker
will prompt the current channel number by voice prompt.

VCO R

VCO

R

Figure 3.9 Transmitter Audio Circuits

IC14, IC12 and the peripherals components compose the
transmitter audio processing circuit. The audio signals from MIC are
amplified to be sent to MCU after the demodulation (VOX signal);
simultaneously they are amplified after preemphasis, amplitude limit
and filtration in the C12 where they have been sent there through
the ACC circuit and finally sent to VCO modulation together with
CTCSS/DCS for modulation.

J2 is the external MIC socket, when the external MIC is used,
the internal MIC will be off automatically while the internal PTT will
remain activated.

3.4 Frequency Synthesizer

3.6 Power Supply:

The radio is equipped with 7.4V, 1700mAh li-polymer battery,
transmitter power amplifier circuit (Q67, Q68), receiver audio power
amplifier (Q92) directly adopt the power supplied by the battery and
other circuits adopt the regulated 5V to supply power.

U13: 5V low voltage difference, micro-power regulator, together
with U12 to supply 5V power with high current.

Q76: T5V switch, controlled by MCU.

T5V: Supply power for the Transmitter front terminal

Q85: R5V switch, controlled by MCU.

R5V: Supplies power for the receiver RF amplification, mixing,
IF processing, audio signal processing.

Q83: C5V switch, controlled by MCU.

C5V: The 5V power controlled by power saving supplies power
for the frequency synthesizer.

3

PT7200 SERVICE MANUAL

3.7 MCU:

Figure 3.11 MCU Diagram

MCU controls the working of each unit of the radio to realize

all the radio functions.

1 Connects with the PC
2 Accesses the radio status data
3 Controls PLL to generate the receiving and transmitting local

oscillation frequency.

4 Accesses the current channel status.
5 Controls the LED status indication
6 Controls the power supply of each location
7 Checks the action of each function key
8 Generates voice contents
9 Generates power on voice prompt
10 Generates CTCSS/DCS signals
11 Generates 2 tone/5 tone signals
12 Generates power control signals
13 Completes CTCSS/DCS decoding
14 Completes 2 tone/5 tone decoding
15 Squelch check and control
16 VOX level sampling

Controls the audio processing chips to complete
emphasis/deemphasis, scrambling/descrambling, companding,
filtration and amplification etc.

Memorizer (E PROM, AT24C64)

2

Memorizes the channel data, CTCSS/DCS data as well as
other function setting data and parameter setting data of the radio.

CTCSS/DCS Encoding and Decoding:

CTCSS/DCS signals generated by MCU (pin24, pin28 output,
PWM wave) are filtered at the filter circuit and then sent to VCO and
TCXO modulation respectively.

CTCSS/DCS signals from the receiver are sent to MCU for
decoding. MCU determines whether the signals contain the same
CTCSS/DCS as that set on the radio and decides whether to turn
on the speaker.

Power adjustment:

MCU PIN1 output DC signals, inputted to APC unit to control
the output power of the transmitter.

3.8 Semiconductor Component

MCU Description

Table 3.3 Microprocessor (M30620FCPFP) Port Description

PinNo. Port Name

1 PCTV

2 DTMF

3 HSDI

4 EPDT

5 EPCK

6 BYTE

7 CNVSS

Input/ output

D/A Output

D/A Output

I

I/O

O

I

I

Function

Receiver sensitivity adjusting voltage

output/power control (V)

DTMF/Tone output, beep output

Tone decoding input

EEPROM data input/ output

EEPROM clock

Gnd

Gnd

4

PinNo. Port Name Input/ output Function

8 BSHIFT

9SV

10 RESET

11 XOUT

12 VSS

13 XIN

14 VCC

15 NC

16 VDET

17 RDT

18 TCLK

19 SCLK

20 QT/DQT

21 TDATA

22 StCtrl

23 DI/O

24 QTVCO

25 DIR

26 APC

27 NC

28 QTTCXO

29 TXD

30 RXD

31 NC

32 APC SW

33 TXD0

34 RXD0

35 DC SW

36 TX W/N

37 RX SW

38 TX SW

39 NC

40 PLL UL

41 PLL STD

42 PLL DATA

43 PLL CLK

44 NC

45 RX W/N

46 EN1

47 EN2

48 EN3

49 EN4

50 EN5

51 W/N R1

52 W/N R2

53 AFCON

54 RX MUTE

55 A BUSY

56 A DATA

57 A SCLK

58 A MUTE

59 NC

60 ACC

61 NC

O

Clock beat frequency control

O

Min. volume control

I

CPU reset input

O

CPU reset output

-

Gnd

I

CPU clock input

-

+5V

I

+5V

I

Voltage down detection

I

AK2346 MSK signal input

I

AK2346 MSK data transmission clock

O

AK2346 data transmission clock

I/O

CTCSS/DCS output

O

AK2346 MSK data transmission outp ut

O

Side tone volume control pin

I

AK2346

O

CTCSS/DCS output VCO (PWM)

O

AK2346 IO control

O

Power control (U)

-

NC
QT/DQT TCXO (PWM)

O

O

TXD1 output

I

RXD1 input
NC

-

O

Power control output switch

O

Extension

I

Extension

O

Power control switch

O

Transmission bandwidth switch

O

Receiver VCO switch

O

Transmitter VCO switch

­Gnd

I

Phase-locked loop loss of lock check pi n

O

Phase-locked loop enabling control

O

Phase-locked loop data output

O

Phase-locked loop clock

-

NC

O

Receiving bandwidth switch

I

UV band selection

I

Encoding switch input pin

I

Encoding switch input pin

I

Encoding switch input pin

I

Encoding switch input pin

O

Receiving IF bandwidth switch

O

Receiving IF bandwidth switch

O

Audio power amplifier enablingcontrol

O

Receiving mute switch

I

Number reporting chip control

O

Number reporting chip data output

O

Number reporting chip clock

O

Number reporting chip control

-

NC

-

+5V

-

NC

Outputs

PT7200 SERVICE MANUAL

PinNo. Port Name Input/ output Function

62 VSS

63 NC

64 SELF

65 OPT S1

66 OPT S2

67 PIO3

68 PIO2

69 PIO1

70 PINT

71 TK1

72 PTT

73 Sk2

74 SK1

SP SW

75

MIC SW

76

R LED

77

G LED

78

5T C

79

5R C

80

5C C

81

P03

82

P02

83

NC

84

NC

85

MAN DOWN

86

BATT

87

RSSI

88

BUSY

89

VOX

90

QT/DQT IN

91

DTMF IN

92

AVSS

93

NC

94

VREF

95

AVCC

96

NC

97

MIC MUTE

98

MIC MUTE

99

HPF PC

100

-

-

-

I

I

I/O

I/O

I/O

I

I

I

I

I

O

O

O

O

O

O

O

O

O

O

-

I

I

I

I

I

I

I

-

-

-

-

-

O

O

O

Gnd

NC

Factory control options

Earphone check

External PTT

MAN DOWN input

Extension

Extension

Extension

Extension

Top key

PTT key

Side key 2

Side key 1

Speaker switch

MIC switch

LED red switch

LED green switch

5T control pin

5R control pin

5C control pin

Fixed side tone control

Phase-locked loop filter

NC

NC

Reverse detection input

Voltage check input

Receiving filed intensity signal input

Squelch voltage check input

VOX voltage check input

CTCSS/DCS input

DTMF input

Gnd

NC

+5V

+5V

NC

External and internal MIC switch

High pass filter switch

Table3.4: Semi-Conductor Component Function

Location mark Model

Ic9 ADF4111

Ic10 NJM2904

U9 Ta31136

Ic12 AK2346

IC14 TC75W51FU

Q92 TDA8541

Ic11 AT24C64

Function description

Phase-locked loop chip

APC, voltage comparison, drive

Receiver's 2nd local oscillation, 2nd IF

amplifier, amplitude limit, demodulation ,

noise amplification

Audio processing

MIC amplification

Receiver audio power amplifier

E2PROM, memory channel frequency

data, function setting parameter,

debugging status parameter

Location mark Model Functiondescription

U14 M30620FCPFP

U11 PST9140NR

Q60 2SC5108

Q66 2SC3356

Q56 2SC5108

Q57 2SC5108

Q65 2SC4617

Q77 2SC2412K

Q68 RD07MVS1

Q67 RD01MUS1

Q69 DTA144EE

Q79 3SK318

Q81 3SK318

Q78 2SC5108

Q73 DTC144EE

Q74 DTC144EE

Q83 2SJ243

Q76 2SA1745

Q85 2SJ243

MCU

MCU reset circuit

Transmitter 1st amplification

Transmitter 2nd amplification

VCO buffering amplifier

VCO buffering amplifier

VCO power filter

noise amplifier

Transmitter final amplifier

Transmitter amplifier drive

APC output switch

The first frequency mixer

Receiver HF amplifier

The first IF amplifier

Red LED drive

Green LED drive

C5V switch

T5V switch

R5V switch

Table 3.5 Diode Function Description

Location mark Model

D Ma77

D101 HSC277

D103 HSC277

D104 HSC277

D201 HSC277

D302 MA2S376

D304 MA2S376

D305 MA360

D310 MA2S376

D308 MA2S376

ZD12 HZU5ALL

D38 MA2S111

D48 MA2S111

D57 1N4148

D53 LED RED

D55 LED GREEN

D54 LED RED

D56 LED GREEN

Function Description

Transmitter antenna switch diode

VCO output switch

Antenna switch

Antenna switch

VCO output switch

VCO oscillation variable capacitance diode

VCO oscillation variable capacitance diode

VCO modulation diode

VCO oscillation variable capacitance diode

VCO oscillation variable capacitance diode

APC output voltage-limiting diode

Loss of lock check diode

VCO power filtering accelerating diode

Noise detector

Transmitting indication

Receiving indication

Transmitting indication

Receiving indication

Table 3.6: XF203 crystal filter features

Item

Nominal center frequency

Transmission bandwidth

40dB barrage bandwidth

Pulse

Insertion loss

Guarantee attenuation

Terminal resistance

Rated value

51.65MHz

7.5kHz or bigger within 3dB

20.0kHz or smaller

1.0dB or smaller

3.0dB or smaller

80dB or bigger within fo-910kHz

1.5k /6PF

5

PT7200 SERVICE MANUAL

Table 3.7 CF201 LTWC450F functions and features

Item

Nominal center frequency

6Db bandwidth

50dB bandwidth

Pulse

Insertion loss

Guarantee attenuation

Rated value

450kHz

5.0kHz or bigger

13.5kHz or smaller

3.0dB or smaller

7.0dB or smaller

45.0dB or bigger within f0 100kHz

Table 3.8 CF202 LTWC450G functions and features

Item

Nominal center frequency

6Db bandwidth

50dB bandwidth

Pulse

Insertion loss

Guarantee attenuation

Rated value

450kHz

3.5kHz or bigger

12kHz or smaller

3.0dB or smaller

7.0dB or smaller

45.0dB or bigger within f0 100kHz

Table 3.9 Semiconductor Component Packaging
Illustration:

Chapter 4 Function Description and Parameter Set ting

4.1 Major Functions

4.1.1 16 Channels

The radio stores 16 channels.

4.1.2 Scanning Channel Function (this function can be

disabled by the programming software)

1) Press the key set to the function of scan to enter the
scanning function. During the scanning, the radio will check signals
of each channel to the signal is found, and then the radio will stay
on the channel with signals till the signal disappear. If the time delay
between the signals disappearing and the scan is set, the radio will
remain on the channel when any signal is received during the
delayed time.

The scanning function can be used only when at least one

channel is programmed and the scanning is valid.

2) Response channel (the transmitting channel when scanning)
during the scanning set by the dealer has the following options:

. The start channel

Press PTT or the CALL key or enable VOX transmitting during
the scanning or when the scanning stays, the radio will transmit
signals on the channel under scanning.

6

. Start channel + current channel (when response channel is

enabled)

If pressing PTT or the CALL key or enabling VOX transmitting
during the scanning, the radio will transmit signals on the channel
under scanning.

If pressing PTT or the CALL key or enabling VOX transmitting
when the scanning is staying, the radio will transmit signals in the
current channel.

. Designated channel

If pressing PTT or the CALL key or enabling VOX transmitting
during the scanning or when the scanning stays, the radio will
transmit signals in the designated channel.

. Designated channel + current channel (when response

channel is enabled)

If pressing PTT or the CALL key or enabling VOX transmitting
during the scanning, the radio will transmit signals at the designated
channel.

If pressing PTT or the CALL key or enabling VOX transmitting
when the scanning is staying, the radio will transmit signals in the
current channel.

1 . Last received call channel

When pressing PTT key, the radio will transmit signals on the
channel of the last received call.

2 . Last used channel

When pressing PTT key, the radio will transmit signals on the
channel where the last transmitting was made.

3 . Last used channel + current channel (when response
channel is enabled)

If pressing PTT or the CALL key or enabling VOX transmitting
during the scanning, the radio will transmit signals on the channel
where the last transmitting was made.

If pressing PTT or the CALL key or enabling VOX transmitting
when the scanning stays, the radio will transmit signals in current
channel.

Priority scan:

During the scanning, if priority channels of the radio have been
set, even if the normal channels are receiving signals, the radio will
scan the priority channels according to the preset time of scanning,
when the priority channels receive signals, the radio will
automatically switch to the priority channels and stay there till the
signals disappear, the dealer has set the time delay between the
signal disappearing and the continuing scanning, if the scanning
stays on 2 priority channel, it will scan back 1 priority channel, on

nd st

which if it stays, no channel will be scanned back.

Excrescent channel (temporary) deletion

If the scanning stays on a certain channel, you can press the
key programmed for deletion of excrescent channel (temporary) to
temporarily delete the channel for the scan list, if you press the
scan key to resume the scanning, this channel will be automatically
added into the scan list again.

Note: priority channels cannot be deleted, when there are only
2 channels for scanning, neither of them can be deleted.

4.1.3 CTCSS and DCS

The dealer may have programmed CTCSS or DCS signals on
channels of the radio, you can ignore calls from other irrelevant
stations using the same channel.

If a certain channel is programmed CTCSS or DCS signals,
only when the correct CTCSS or DCS signals are received can the
squelch be enabled. Similarly, only stations using the same

PT7200 SERVICE MANUAL

CTCSS/DCS signals as being used in your radio can receive the
signals you transmit.

4.1.4 TOT function

1) TOT timer:

a) The purpose of the time-out timer is to prevent any person
from overlong using a channel to speak and to prevent radio from
too long continuous transmitting.

b) TOT timer indicates the time allowed for the radio to
continuously transmit signals. If the allowed time is exceeded, the
radio will alarm and stop transmitting.

2) TOT key:

a) It regulates the time span of prohibited transmitting after the
action of the TOT timer.

B) During the time span of prohibited transmitting, if pressing
the PTT key or the CALL or starting the VOX, indication tone will be
generated and the transmitting will be prohibited.

3) TOT Pre-alarm

a) The radio will alarm in advance before the TOT timer stops
the transmitting.

b) After the alert, if the transmitting time exceeds the preset
time, the TOT timer will act.

4) TOT Reset:

a) It regulates the time delay from PTT key releasing to the TOT
timer resetting.

b) If the time of releasing the PTT key is shorter than that of the
resetting time, the countdown will continue.

4.1.5 Auto Power Saving

The dealer can set the power-saving mode of the battery by
programming.

Provided that the function is enabled, the radio will be in the
power-saving mode in 10 seconds if no signal is received or no
operation is carried out. When any signal is received or any
operation is carried out, the radio can automatically quit this mode.

Power-saving modes: short, med, long and off.

Setting the power-saving function of a battery can reduce the
power consumption of the battery.

4.1.6 Low Power Warning

Receiving low power warning: If the battery power is lower than
the preset value during receiving, the radio will produce a alert tone
of Doo every 15 seconds.

Transmitting low power warning: When the battery power
appears low, the indicator flashes. If the battery power is lower than
the preset value during transmitting, the status indicator flashes red.
If the battery level is too low, the radio cannot transmit signals.

4.1.7 Squelch enabled function

If no signal is received, the squelch circuit of the radio will
prevent the speaker from making any sound.

Press the function key for squelch off switch , you can disable
the squelch control circuit and the speaker will produce continuous
sound (whether signals are received). This operation is very useful
for adjusting volume or receiving weak signals (avoiding
discontinuous sound due to weak signals).

Press the function key for squelch on switch , the green light
will be on and the radio is in the monitoring status.

4.1.8 5TONE signaling

5Tone has 9 encoding formats: CCIR1, CCIR2, ZVEI1, ZVEI2,
ZVEI3, EEA, EIA, USER DEFINED1 and USER DEFINED2. The
last two formats are customized modes.

1. 5tone decoding

The decoding template is the 5tone decoding template. If the
decoding template is the same to that of encoding, the decoding will
be successful.

When the radio receives correct 5tone signaling, turning on
squelch according to the receiving squelch mode set by the user,
you can receive the call and the orange LED will flash.

After successful decoding, the radio will operate according to
the decoding call response set by the dealer.

2. 5tone encoding

The ending template is made of 1-3 encoding sequences. Each
encoding sequence can be set to 5tone or DTMF. If 5tone is
selected, you need to set its content.

If the PTT ID of the selected channel is set to 5Tone , 5Tone
will be transmitted when calling.

Or, when pressing the side key for Call1/2/3/4 , 5tone
signaling will be sent, this function is programmed by the dealer.

4.1.11 PC Programmable

You can program the radio functions and adjust some
parameters by PC programming software KSP7200.

4.1.12 Squelch Level Selection

The purpose of the squelch is to mute the speaker noise when
no signals are received or the signals are weak. When the squelch
is activated, you can hear noise from the speaker; when the
squelch is inactivated, you will not hear noise form the speaker.
Selecting the squelch level is to select which the signal strength
level is strong enough to enable the squelch or weak enough to
disable the squelch. Over high squelch level will make the radio
unable to receive signals efficiently when signals are weak; over low
squelch level will make the radio communication affected by noise
or other irrelevant signals. The squelch level has 0-9 options..

4.1.13 Beep Tone Volume

This setting controls the power on tone, channel busy tone and
TOT tone, etc..

4.2 Parameter Setting (PC Mode)

The radio parameters have been programmed in the factory.
The user can reset the radio parameters such as working frequency,
channels, CTCSS/DCS and auto scanning. We designed a user­friendly and convenient programming software KSP7200 for users
to set parameters on the radio. The programming steps are as
follows:

a. Install the programming software KSP7200.

b. Connect the radio to the computer serial port with the
specified programming line (KSPL-08), See Figure 4-1.

Computer

(RS232 serial port)

Figure 4-1

c. Turn on the computer power.
d. Turn on the radio power.
e. Click the KSP7200 program to run the programming software.

Programming

cable

Radio

(Speaker/MIC socket)

7

PT7200 SERVICE MANUAL

f. Click on [Read] in the KSP7200 main menu to read the radio
parameters into the computer; click on [Write] to transfer the PC
programming parameters into the radio.

g. You can program the following parameters with the KSP
7200:

1) The RX and TX frequency of each channel;

2) The receiving and transmitting signaling of each channel;

3) Busy channel lockout option;

4) TOT;

5) Squelch level option;

6) 5-tone or 2-tone settings

7) Power saving option.

8) Alarm function setting.

9) Monitor mode option.

10) Scan mode option.

11) Scan the reverting channel option.

12) Scan the priority channel selection.

For more details, please refer to the Help document of
KSP7200 software.

ATTENTION:

1. Turn off the radio before connection.

2. When the data is read on the radio, the indicator light turn red
and it's prohibited to press the PTT button; when the data is written
on the radio, the indicator light turns green.

3. Before the first time of editing, you should read data on the
radio firstly and then and backup the data.

4. If the radio cannot work normally after being written in with
the editing data, open the data backup and rewrite the backup into
the radio.

5. Model information is important radio data and is prohibited
to modify.

4.3 Computer Test Mode:

As shown in figure 4-1,connect the radio to the radio

communication port with the specified testing cable.

Warning: Before enter the computer test mode, connect a HF
load of 50 to the radio antenna connector or connect the radio to a
comprehensive test device.

Under the computer test mode, you can modify the following
parameters with KSP7200 programming software:

1) Frequency Stability

2) Low/High power

3) Max. Tone deviation

4) DCTCSS balance

5) DCTCSS frequency deviation

6) CTCSS frequency deviation

7) DTMF frequency deviation

8) Tone frequency deviation

9) MSK frequency deviation

10) VOX plus

11) Sensitivity

12) SQL 1/9 (OPEN/SQUELCH)

For mort details,please refer to the Help document of
ksp7200 software.

4.4 Wired Clone Parameters

Wired clone mode:

It can be enabled/disabled by programming software, this mode
can only be entered when the wired clone functions of both the host

radio and the client radio are enabled.
Operating steps are as follows:

1.Press the side keys SK1 and SK2 of the primary, and then press
and hold the power switch of the radio for about 2 seconds, the
orange light flashes twice and the beep sound of Clone will be
produced, and then the radio enters the wired clone mode.

2.Press the PTT button on the host radio, the host radio will start to
send data, the client radio for receiving data will enter the wired
clone mode.

3.During the data duplication, the red light of the host radio will be
continuously on and the green light of the client radio will be
continuously on.

4.After the data are successfully cloned, the host radio will report
Success and be automatically restarted; the client radio will

also be automatically restarted.
Note: During the duplication of data, if the radio models or software
versions are not consistent, the red light of the host radio will flash
(0.25s On 0.25s Off) and the sub radio will be automatically
restarted; if no data was received within 3 seconds, the red light of
the host radio will flash (0.5s On 0.5s Off) and the client radio will be
automatically restarted.

Chapter 5 Service, Assembly and Disassembly

The radio is a precision communication equipment. Please be
careful when assemble or disassemble the radio during service.
Instructions for assembly and disassembly are as follows:

5. 1 Removing and Installing

the Battery

To remove the battery, push the
latch upwards and remove the
battery away from the radio. (See
figure 5.1)

To install the battery, match the
tow bulges at the bottom of the
battery with the corresponding
grooves at the radio aluminum alloy
frame and insert it in. Then press the
upper end of the battery till the latch
secure. (See figure 5.2 and figure

5.3)

5. 2 Removing and Installing

the Belt Clip

To remove the belt clip, use
your nail or a tool to lift the metal
spring piece in the belt clip from the
topside, and then pull the belt out
wards.

To install the belt clip, match the
upper head of the belt clip with the
glides on the rear of the battery, and
then press the belt clip downwards

Figure 5.4

Figure5.1

Figure5.2

Figure5.3

8

5. 3 Removing the Casing from

the Chassis

1.Remove the knobs;

2.Remove the two knob nuts and

the antenna nut;

3.Remove the two cross head

screws that fix the top cover at the top;

4.Remove the two cross head
screws that fix the aluminum alloy
frame at the bottom by tool;

5.Pull the aluminum alloy frame
out of the casing;

See Figure 5-5

Figure5-5

PT7200 SERVICE MANUAL

5. 4 Remove the Chassis

from the Main Board

1.Remove the screw;

2.Melt the solder at the antenna
point with a electric soldering iron and
take off the main board;

3.Take away the two screws and
the antenna connector..

See Figure 5-6

After the aforesaid operations, you can carry out corresponding
service or debugging according to the actual situation.

5-6 Figure

Figure 5-7 Exploded View

9