Kirisun PT6700 Service Manual

PT6700 Service Manual

1

Dangerous!

Do not connect the AC power or DC power over 8.6V with
any connector or terminal 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 higher than 20 dBm (100mW).

Do not turn on the radio before 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!

Kirisun Communications Co., Ltd owns the copyright of
KSP6700 software.

KSP6700 software is free for copying.

Kirisun Communications Co., Ltd owns the copyright of the
MCU software code.

Kirisun Communications Co., Ltd owns the copyright of the
radio outward appearance/structure/circuit design.

Kirisun Communications Co., Ltd owns the copyright of this
service manual. Unauthorized publication is prohibited.

Kirisun Communications Co., Ltd owns the trademarks

“KIRISUN”, “ ”, “ ”, and “科立讯”.

Content

Chapter 1 Overview ..................................................... 2

Chapter 2 External View and Functional Keys ............ 2

Chapter 3 Circuit Description ...................................... 3

Chapter 4 Mode Introduction ....................................... 8

Chapter 5 Disassembly for Repair ............................. 10

Chapter 6 Specifications .............................................. 1

Chapter 7 Troubleshooting ......................................... 17

Appendix 1 Abbreviations ......................................... 17

Appendix 2 Electronic Parts List ............................... 17

Appendix 3 Structural Parts List ................................ 26

Appendix 4 Accessories ............................................. 27

Figure 1 PT6700 Block Diagram 错误！未定义书签。

Figure 2 PT6700 Schematic Circuit Diagram ............ 30

Figure 3 PT6700 Top Layer Position Mark Diagram 38
Figure 4 PT6700 Bottom Layer Position Mark Diagram

................................................................................... 39

Figure 5 PT6700 Top Layer Position Value Diagram 40
Figure 6 PT6700 Bottom Layer Position Value Diagram

................................................................................... 41

PT6700 Service Manual

2

Radio

Model

Component

Position

Mark

Model/

Specifications

Part No.

Qty

PT6700-01

FET

Q203

2SK1824

1TF1-2SK1824

1

Chapter 1 Overview

1.1 Introduction

This manual applies to the service and maintenance of PT6700
series of FM portable radios, and is intended for use by engineers
and professional technicians that have been trained by Kirisun. It
contains all required service information for the equipment.
Kirisun reserves the right to modify the product structure and
specifications without notice in order to improve 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.

Please read this manual carefully before repairing the product.

1.2 Service Attentions
* Safety

Do not touch the antenna connector or the PCB while
repairing the radio.

Do not reverse the battery 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 before 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

It’s prohibited to use or repair the radio in the following

places:

Hospital, health center, airport

Any area with a potentially explosive atmosphere (e.g. orlop
deck of the ship, storage or transportation equipment for fuel and
chemical etc.)

Any place near blasting sites or area with electrical blasting
cap.

It’s recommended to avoid using or repairing the radio in the
following place:

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

* Replacement Parts

All components used for repair should be supplied by Kirisun.

Components of the same type available on the market are not
surely able to be used in this product and we do not guarantee the
quality of the product using such components.

If you want to apply for any component from Kirisun, please
fill in an application form as below.
e.g.
Component Application Form

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 12
months. Accessories (such as battery pack, antenna, charger and
power adapter etc.) are guaranteed for free service of 6 months.
However, in one of the following cases, charge free service will be
not available.
* No valid warranty card or original invoice.
* Malfunction caused by disassembling, repairing or
reconstructing the radio by the users without permission.
* Wear and tear or any man-made damage such as mechanical
damage, burning or water leaking.
* Product’s serial number has been damaged or the product
trademark is difficult to identify.

After the warranty expires, lifetime service is still available.
We also provide service components to service stations and staffs.

Chapter 2 External View and Functional Keys

2.1 External View

2.2 Functional Keys

① LED Indicator

Lights red while transmitting; lights green while receiving;
flashes red when the radio is in low power.

PT6700 Service Manual

3

RF

AMP

5T

TX/RX SW

5T5R

RF

AMP

5C

BUFFERRXVCO

TXVCO

MODE

RIPPLE

FILTER

5C

BUFFER

PLL IC

DATA FROM MCU

CLK FROM MCU

LE FROM MCU

PS FROM MCU

LOCK TO MCU

TCXO

12.8MHz

QT/DQT FROM MCU

CENTER FREQUENCY ADJUST FROM MCU

5C

5C

MIXER

5R

IF

AMP

5R

5C

12.8MHz TO

51.2MHz

DET COLL

51.65MHz

+/- 15KHz

+/- 7.5KHz

450KHz

NOISE

AMP

TA31136NOISE DETBUSY SIGNEL TO MCU

5R

② On/Off/Volume Control Knob

Turn clockwise until you hear a click to turn on the radio. Turn
counterclockwise until you hear a click to turn it off. Rotate it to
adjust the volume after turning on the radio.
③ Channel Selector Knob
Rotate the knob to select channel 1-16.
④ PTT (Push-To-Talk) Button
Press and hold the PTT button and speak into the microphone,
your voice can be sent to the recipient. Release the PTT button to
receive.

⑤ Side Button 1 (programmable button)
⑥ Side Button 2 (programmable button)
⑦ Top Button (programmable button)
⑧ External Speaker/Microphone Jack Cover

Remove the cover; you will see the external
speaker/microphone jack. External speaker/microphone can be
connected to the radio through this jack.

Chapter 3 Circuit Description

3.1 Frequency Configuration

Figure 3.1 Frequency Configuration

The reference frequency of the frequency synthesizer is
provided by 12.8MHz crystal oscillator X300 TCXO. The receiver
adopts double mixing. The first IF is 51.65MHz and the second IF
is 450kHz. The first local oscillator signal of the receiver is
generated by the frequency synthesizer. The second local
oscillator signal adopts the fourth harmonics (51.2MHz) of the
crystal oscillator X300 (TCXO, 12.8MHz). Transmitter signal is
directly produced by the frequency synthesizer.

3.2 Principle of Receiver (RX)

Figure 3.2 Principle of Receiver

Front end

The signal coming from the antenna passes through the
RX/TX switch circuit (D400, D401, D403 and D404), and passes
through a BPF comprises of C504，C510，L502，L507，C526，
C549，D508，C548，L515，C547，C532，D503，C544 and L513
to remove unwanted out-of-band signal, and is sent to the low
noise amplifier (LNA) consists of Q504 and its peripheral
components to be amplified.
Output signal from the LNA passes through a BPF comprises
of L511，C530，C540，D506，C539，L510，C538，C529，
D505，C537，L509，C536 and D504 and goes to the first mixer
(Q503).
PWM wave is output from pin 12 of the MCU. The wave is
filtered and rectified into adjustable voltage, which can control the
center frequency of the band pass filter through changing capacity
of the varactor diodes (D503, D504, D505, D506, D507, and
D508).

First mixer

The received signal from LNA is mixed with the first local
oscillator signal from the frequency synthesizer to produce the
first IF signal (51.65MHz). Then the first IF signal passes through
crystal filter (Z1) to remove the adjacent channel signal and signal
outside the adjacent channel.

IF circuit

The first IF signal from the crystal filter is amplified by the
first IF amplifier (Q502), and is sent to the IF processing IC
(IC500, TA31136).
IF IC consists of second mixer, second local oscillator, IF
amplifier, limiter, discriminator, and noise amplifier.
The 12.8MHz frequency produced by TCXO (X300) is
multiple-amplified and then the fourth harmonics (51.2MHz) is
adopted as the second local oscillator signal source. The second
local oscillator signal (51. 2MHz) is mixed with the first IF signal
(51.65MHz) in IC500 to generate the second IF (450kHz). And
then the second IF signal is amplified and limited in IC500,
filtered by the ceramic filter (CF500, 450kHz), and demodulated
in IC500 to output audio signal.

PT6700 Service Manual

4

Figure 3.3 IF System

Rx audio signal processing

The voice signal processing circuit of the receiver consists of
IC702 and its peripheral circuits. After being amplified in
IC702-C, voice signal from IC500 is sent to IC4 (CTCSS signal
filtering circuit) and IC702-D respectively. The signal is then
amplified, deemphasized and filtered by other units of IC702 to
remove HF and LF components contained in the audio frequency,
with only voice components within 300~3000Hz left. The
resulting signal is then sent to Q701 for amplification. The
amplified signal is adjusted by the volume potentiometer and then
is sent to the audio power amplifier (U2).

Figure 3.4 Audio Processing of Receiver

Squelch circuit

The demodulated signal from IC500 goes to the selective
noise amplifier consists of internal noise amplifier of IC500, C522,
R521, C522 and R516 to remove the noise component. The
resulting signal is then amplified by Q500 and demodulated by
D501 and is sent to the MCU. MCU identifies level of the noise
and controls the squelch.

Audio power amplifier

The audio power amplifier circuit consists of U2 and its
peripheral components.
The received audio signal, voice alert signal, alert tone signal
and warning tone signal are collected and pass through the audio
amplifier where they are amplified and output to drive the speaker.
The volume of the warning tone is not controlled by the preset

volume level of the radio.
When AFCO is in high level, Q707 turns on, U2 starts to
operate, and the speaker makes sound. Speaker impedance: 16Ω.

CTCSS/DCS signal filtering

Audio signal demodulated by IC500 may contain CTCSS
(Continuous Tone Control Squelch System) or DCS (Digital Code
Squelch) signal. The spectrum components of CTCSS/DCS are
within 2-250Hz. The filtering circuit consists of IC4 can remove
signals outside the CTCSS/DCS spectrum, which enables the
MCU to decode CTCSS/DCS more accurately.

3.3 Principle of Transmitter (TX)
TX power amplification

Figure 3.5 Principle of Power Amplifier and Antenna Switch

The modulated RF signal from VCO is amplified by Q303,
Q304 and Q401, and is sent to Q400 for power amplification.
Grid bias of Q400 and Q401 is controlled by the APC circuit.
Through changing the grid bias voltage, the Tx output power can
be controlled conveniently.

APC (Automatic Power Control)

Figure 3.6 APC Circuit

R422, R423 and R424 are used to test the power amplification
current. IC400A is the sampling amplifier for the power
amplification current. IC400B is the power comparator amplifier.
If the Tx output power is too high, the power amplification
current and IC400A output will increase; IC400B output voltage
will decrease, so the bias voltage of Q400 and Q401 will also
decrease, which causes the Tx output power to be lowered, and
vice versa. Thus the Tx output power can keep stable under
different working conditions.
MCU can set the power through changing the voltage input to
IC400B.

PT6700 Service Manual

5

Tx voice signal processing

Figure 3.7 Transmitter Audio Circuit

The Tx voice signal processing circuit consists of IC600 and
its peripheral components. After being amplified, limited and
filtered, the voice signal from MIC is sent to VCO for modulation
together with CTCSS/DCS signal.
The AGC circuit consists of D600, D601 and Q601. When
signal from MIC is too strong, the AGC circuit will lower the
signal strength to make sure that no distortion happens to the
signal.
Q600 is the power switch of the voice processing circuit. It is
controlled by MCU. Power supply of IC7 will be turned on when
the radio is transmitting.
J2 is the jack for external MIC. When using external MIC, the
internal MIC will be turned off automatically. But the internal
PTT is still effective.

3.4 Principle of Frequency Synthesizer

Figure 3.8 Frequency Synthesizer
The radio adopts PLL type frequency synthesizer.
The frequency synthesizer consists of reference oscillator,
voltage control oscillator (VCO), programmable divider, phase
comparator, and low pass filter.
Rx VCO unit consists of Q302, L308, C331, C335, C332、
D301 and D303. Tx VCO unit consists of Q307, L322, C355,
C363, C371, C364, D306 and D308. D304 is the modulation
circuit of VCO.
IC300 (MB15E03) is PLL integrated circuit, which consists of

programmable reference divider, programmable swallowing
divider, phase comparator, and charge pump.
The low pass filter consists of R329, C358, R330, R331, C359,
R332, C356, C365 and C360.

The reference frequency is provided by X300 (TCXO,

12.8MHz).
The reference frequency from TCXO (Temperature
Compensated Crystal Oscillator) is divided by the programmable
reference divider in IC1 to produce reference frequency of 5kHz
or 6.25kHz (determined by the preset channel frequency and is
controlled by MCU).
The oscillation frequency from VCO goes to IC300 where it is
divided by the programmable swallowing divider and is then
compared with the reference frequency to obtain error signal. The
signal is then filtered by a low pass filter and is sent to VCO to
change the oscillation frequency of the VCO, enabling the
frequency to reach the set value. Then the VCO is locked.
N=F

VCO/FR

N: Times of frequency division
F

: Oscillation frequency of VCO

VCO

FR: Reference frequency

Unlock detection: When PLL is unlocked, Pin 14 of IC will
output low level signal to MCU. Then MCU prohibits the
transmitter from transmitting and makes an alert tone.

Q308: Power filter, which provides more purified power for
PLL to reduce noise of the frequency synthesizer.

3.5 Voice Alert Circuit

The radio is provided with voice alert function, which is
especially useful at night or in dark environment.
IC203 is a voice memory chip, which is stored with voices of
channel indication etc. Once the channel selector knob is switched,
the speaker will announce the current channel number. You can
press the preprogrammed “Voice Alert” key to repeat the current
channel number.
If voice alert function is enabled, the speaker will announce
the current channel number once the “Voice Alert” key is pressed
under standby mode. You can switch the voice type by pressing
and holding the “Voice Alert” key while restarting the radio. Do it
repeatedly to switch the voice type in the order of “Chinese
Male-English Male-Chinese Female-English Female-No Alert”.

3.6 Power Supply

The radio uses 7.4V, 1700mAh Li battery. The Tx power
amplification circuit (Q400 and Q401) and the Rx audio power
amplifier (U2) directly adopt the battery for power supply. Power

PT6700 Service Manual

6

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

EEPROM

D/A

chananl

SW

PTT

MONI

ALARM

PF1
CTCSS/DCS IN

SQL

BATT

VCCN

CTCSS/DCS

BEEP

LE

DATA

CK

to PLL

VIOCE CHIP

TX/RX CONTROL

RXD

TXD

to PC

UL

5TC

5RC

SAVE

APC CONTR

SHIFT
IC200

IC203

MCU

of other circuits is supplied by 5V regulated voltage.
IC100: 5V low dropout, micro-power regulator, which
supplies 5V power with large current for the radio together with
Q104.
Q100: 5T switch, which is controlled by MCU.
5T: Supplies power for front end of Tx.
Q102: 5R switch, which is controlled by MCU.
5R: Supplies power for RF amplifier, mixer, IF processing unit,
and audio signal processing unit etc. of the receiver.
Q103: 5C switch, which is controlled by MCU.
5C: 5V power supply under SAVE control. Supplies power for
frequency synthesizer.

3.7 MCU Unit

Figure 3.9 Principle of MCU Unit
MCU unit controls the operation of each unit of the radio so
that all functions can be realized.
Communicate with external PC.
Access the status data of the radio.
Control the PLL to generate Rx and Tx local oscillator
frequencies.
Obtain status parameters of current channel.
Control status of LED indicator.
Control power supply for each unit.
Check the actions of each functional key.
Generate CTCSS signal.
Generate DCS signal.
Generate power control signal.
Perform CTCSS decoding.
Perform DCS decoding.
Test and control the squelch.
Control content of voice alert.

Memory (E2PROM, AT24C08):

The memory is stored with channel data, CTCSS/DCS data,
other function setting data, and parameter adjusting data.

CTCSS/DCS signal encoding and decoding:

The CTCSS/DCS signal (output from pin 12) generated by
MCU is filtered by R155, R156, C242 and C243. Then the
resulting signal is divided into two parts and sent to VCO and
TCXO respectively for modulation.
The CTCSS/DCS signal from the receiver is sent to MCU (pin

49) for decoding. MCU checks if the CTCSS/DCS signal in the
received signal matches the preset value of the radio, and
determines whether to open the speaker or not.

Power adjustment:

Output from pin 42 of the MCU passes through integrating
filter (R161, C317, R206, and C318), and is sent to the APC unit
to control the output power of the transmitter.

CTCSS

CTCSS (Continuous Tone Control Squelch System) is a
squelch control system which is modulated on carrier and is
guided by a continuous sub-audio signal. 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.
PT6700 has 39 groups of standard CTCSS frequencies for
your selection. See table 3.1.
The CTCSS signal is generated by MCU, and is passed
through low pass filter consists of RC to remove high frequency
components (above 300Hz). Then the resulting signal is sent to
VCO for modulation.

Table 3.1 CTCSS Frequencies

PT6700 Service Manual

7

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

No.

Port

name

Pin

Name

I/O

Function

1

NC

NC 2 AFCO2

P35 O Audio frequency switch 2

3

GLED

P33 O Green LED switch

4

PTT

P34 I [PTT] input

5

MODE I

Connect the 4.7K resistor with VCC, programming test
point 6 VDEVC2

P43 O VHF deviation switch 2

7

VDEVC1

P44 O VHF deviation switch 1

8

RST I

Reset input, programming test point

9

XOUT O

10

VSS I

GND, programming test point

11

XIN I

Oscillator (7.3MHz)

12

VCC I

5V CPU power input, programming test point

13

SHIFT

P27 O Clock beat shift. H: On

14

VCCN

P26

O(PWM)

Frequency stability output

15

TO

P25

O(PWM)

QT/DQT output

16

WNTC

P24

O

Wideband/Narrowband control
H: Wideband, L: Narrowband

17

APC

P23

O(PWM)

TX: Automatic power control output, RX: 0

18

TUNE

P22

O(PWM)

TX: 0 RX: BPF tuning output

19

BEEP

P21

O(PWM)

BEEP/DTMF output

20

SDA

P20

I/O

EEPROM data line

21

ENC0

P17 I Encoder input

22

ENC2

P16 I Encoder input

23

ENC3

P15 I Encoder input

24

ENC1

P14 I Encoder input

25

SCL

P13 O EEPROM clock line

26

NC

NC

27

UL

P45

I

PLL circuit unlock detect pin
H: locked, L: unlocked

28

TXD

P66 O RS-232C output, programming test point

29

RXD

P67 I RS-232C input, programming test point

30

CK

P12 O PLL clock output

31

DT

P11 O PLL data output

32

LE

P10 O PLL IC enable pin, H: locked

33

RX

P31 O Receiving enable

34

BUSY_V

P30 O Busy signal of voice annunciation IC

35

DATA_V

P65 O Data of voice annunciation IC

36

SCLK_V

P64 O Clock of voice annunciation IC

37

RLED

P63 O Red LED control, H: On

38

NC

P07

I(A/D0)

Connect the pull-up resistor with VCC, and connect the
pull-down resistor with VSS

39

NC

NC

40

NC

NC

41

TI

P06

I(A/D1)

QT/DQT signal input

42

BUSY

P05

I(A/D2)

Busy signal input

43

BATT

P04

I(A/D3)

Battery voltage detect

44

VREF I

Connect with VCC

45

SAVE

P60

O

Battery saving control, H: supply power, L: power
saving

46

MUTE

P62 O Mute control H: Mic mute L: audio mute

47

5RC

P61 O Receiving power control L: On

48

KEYIN

P03

I(A/D4)

Programmable key P1, P2, P3 detect

49

5TC

P02 O Transmitting power control, H: On

50

RLED

P01 O Red LED switch

51

AC

P00

O

Alarm switch control, H: controlled by volume switch
Radio should be in low level in emergency alarm

52

AFCO1

P37 I Audio control switch 1

Position

Mark

Model

Function Description

1

IC300

MB15E03

Frequency synthesizer

2

IC701

NJM2904

APC, voltage comparison, driving

DCS

DCS (Digital Code Squelch), which is used to control squelch,
is a series of continuous digital codes modulated on carrier
together with voice signal. If DCS is set, the speaker can be
opened only when the radio receives signal with the same DCS to
avoid disturbance of unwanted signals.
PT6700 has 83 standard codes (inverted and non-inverted) for
your selection. See table 3.2.
DCS signal is produced by MCU (in waveform of PWM). It
passes through the low pass filter consists of RC to remove the
high frequency components (above 300Hz). Then the resulting
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 CTCSS/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

3.8 Semiconductor Data

Refer to table 3.3 for descriptions of each pin.

Table 3.3 Definition of CPU Pins

Table 3.4 Function Description of Semiconductor Components

PT6700 Service Manual

8

3

IC500

TA31136

Rx second local oscillation, second IF
amplification, limitation, demodulation, and
noise amplification

4

IC702

NJM2902

Amplification and filtering of demodulation
signal of receiver.

5

IC600

NJM2902

MIC amplification, limitation and filtering

6

U2

TDA2822

Audio frequency power amplification of
receiver

7

IC200

AT24C08

E2PROM, memorizes channel frequency data,
function setting parameters and adjusting status
parameters

8

IC201

R5F212A8

MCU

9

IC202

PST9140NR

MCU reset circuit

10

IC100

HT7150-1

LDO, low-power voltage regulator

11

IC203

W588A080

Voice storage IC

12

Q402

2SC5108

First amplification of transmitter

13

Q403

2SC3356

Second amplification of transmitter

14

Q304

2SC5108

VCO buffer amplifier

15

Q303

2SC5108

VCO buffer amplifier

16

Q308

2SC4617

VCO power supply filter

17

Q500

2SC4738

Noise amplifier

18

Q701

2SC4617

Audio frequency signal amplification of receiver

19

Q400

2SK3476

Transmitter final power amplification

20

Q401

RD01MUS1

Transmitter power amplification driving

21

Q404

DTA144EE

APC output switch

22

Q503

3SK318

First mixer

23

Q504

3SK318

Receiver high power amplifier

24

Q502

KTC4082

1st IF Amplifier

25

Q200

DTC144EE

Red LED Driving

26

Q201

DTC144EE

Green LED Driving

27

Q601

2SK1824

Voice alert switch

28

Q100

KTA1298

5T switch

29

IC102

KTA1298

5R switch

Position Mark

Model

Function Description

D400

MA77

Transmitter antenna switch diode

D401

HVC131

Transmitter antenna switch diode

D402

HSC277

VCO output switch

D403

HVC131

Antenna toggle switch

D301

HVC376B

VCO oscillation varactor diode

D303

HVC376B

VCO oscillation varactor diode

D304

MA360

VCO modulation diode

D405

HZU5ALL

APC output voltage-limiting diode

D309

MA2S111

Unlock detection diode

D310

MA2S111

VCO oscillation varactor diode

D501

1N4148

Noise demodulation

D202

GREEN LED

Receiving indicator

D509

MA2S111

APC single diode

D201

RED LED

Transmitting indicator

D202、D203

GREEN LED

Receiving indicator

Item

Rated Value

Nominal center frequency

51.65MHz

Pass band width

±7.5kHz or higher but within 3dB

40dB stop band width

±20.0kHz or lower

Pulse within band

1.0dB or lower

Insertion loss

3.0dB or lower

Guarantee attenuation

80dB or higher, within f0-910kHz

Terminal impedance

1.2kΩ

Item

Rated Value

Nominal center frequency

450kHz

6dB band width

±6kHz or higher

50dB band width

±12.5kHz or lower

Pulse

2.0dB or lower, within f0±4kHz

Insertion loss

6.0dB or lower

Guarantee attenuation

35.0db or higher, within f0±100kHz

Terminal impedance

2.0kΩ

Mode

Function

How to enter

User Mode

For normal use

Power ON

PC
Mode

Data
Programming
Mode

Used to read and write
frequency data and
other features to and
from the radio

Received commands
from PC.

PC Test Mode

Tune the radio
parameters by PC

Received commands
from PC.

Firmware
Programming
Mode

Upgrade the radio
when new features are
released

Press and hold the top
key for over 2 seconds
while turning the radio
power ON, and received
commands from PC

Wired Clone Mode

Used to transfer
programming data
from one radio to
another

Press and hold side key 1
for over 2 seconds while
turning the radio power
ON

3SK31 8
M: YB-

G1

G2

D

S

G

S

D

CC

C

C

B

B

B

B

E

E

E

E

G

D

S

2SK18 24

Mark: B1

2SC510 8

M: MC

C

B

E

M: R24

2SC335 6

C

B

E

2SC461 7

C

B

E

C

B

E

2SC473 8

KTC4082

C

B

E

2SC162 3

M: L6

KTA12 98

DTC144EE

M:16

GNDINOUT

HT7150 -1

RD01MUS1

D

G

S

S

RD07MVS1

RDA000 2

1

2

3

DA2 21
M: K

2SK30 8N V

DTA14 4EE

C

B

E

FMMT591

GSD

Table 3.7 Features of CF500LTVPC450EB

Table 3.8 Schematic Diagram for Packaging of Semiconductor

Devices

Table 3.5 Function Description of Diodes

Mode Introduction

Chapter 4 Mode Introduction

Table 3.6 Features of Crystal Filter Z1

4.1 User Mode

You can enter User Mode (conventional communication mode)
by turning the radio power ON. Under this mode, users can use
the defined functions of the radio.

4.2 Data Programming Mode

PT6700 Service Manual

9

Computer

(RS232 serial port)

Programming

cable

Radio

(Earphone/Program

ming interface)

The radio has been set before leaving the factory. However,
due to different requirements of users, the radio’s operating
frequencies, channels, CTCSS/DCS, scan, and other functional
parameters should be reprogrammed. Therefore, Kirisun has
specially designed a set of Chinese/English programming software
KSP6700 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 PC

are as follows:

A. Install KSP6700 on the computer.
B. Connect the radio to the serial port of the PC with the

special programming cable (KSPL-U08). Refer to the
figure below.

Figure 4.1

C. Turn on the computer.
D. Turn on the radio.
E. Run the KSP6700 programming software by double

clicking on its executive program.

F. Click “Program” in the main menu of KSP6700, and

click “Read” in the pull-down menu to read parameters
of the radio to the computer; click “Write” in the
pull-down menu to write parameters in the computer to
the radio.

G. The following parameters can be set by using KSP6700

according to requirements of the user:

Radio Information:

Radio Model (model/frequency range), Serial Number,

Embedded Information, MCU Version, Hardware Version, etc.

Radio Parameters:

1) Key Assignment: Side Button 1, Side Button 2, Top Button

can be set as long/short key and the hold time can be defined.

2) Optional Functions

1. Wired Clone enable

2. TOT All Low Power Switch

3. TOT Reset Time Firmware Programming Mode enable

4. TOT Pre-alert Beep Tone

5. TOT Rekey Time All Low Power

6. Squelch Level Selection

7. Voice Annunciation Setting Battery Save

8. Password of Read Radio

9. Password of Write Radio

3) Scans
Scan function setting: Priority Channel selection, Revert
Channel selection, Tx Dwell Time, Dropout Delay Time,
Lookback Time.

4) Emergency Setting
Channel Parameter:
(1) CH Rx frequency and Tx frequency (Step value:

2.5kHz/5kHz/6.25kHz)

(2) CH Rx signaling and Tx signaling.
a) None
b) CTCSS (60~260Hz @ 0.1Hz step)
c) DCS(-777 ~ 777 @ octal umber)
(3) Busy channel lockout selection
(4) Clock beat control
(5) Channel spacing 25kHz/12.5kHz (Wide/Narrow) selection
(6) Add/delete scan list
(7) High/low power level selection
(8) QT Reverse
For detailed operation, please refer to “Help” of KPS6700
programming software.
Note:

1. Firstly, please read data of the radio and back up the data before
editing the parameters on KSP6700.

2. If the radio cannot function normally after being written in with
the edited data, please rewrite the backup data into the radio.

3. “Model Information” is important for the radio; users should
not modify it.

4.3 PC Test Mode

Connect the radio to the serial port of the computer with the
special programming cable. Please refer to Figure 4.1.
Warning: Non-professionals should not enter PC Test Mode;
otherwise, the radio may be damaged. Before entering the PC Test
Mode, please firstly connect a 50Ω high frequency load to the
antenna connector of the radio or connect the radio to a general
test set.
In the programming software, enter the Tuning Mode under
the PC Test Mode to tune the following parameters of the radio:

1) Frequency Stability

2) Five frequency points of Tx High Power

3) Five frequency points of Tx Low Power

4) Five frequency points for SQL9 On (Wideband)

5) Five frequency points for SQL9 Off (Wideband)

6) Five frequency points for SQL9 On (Narrowband)

PT6700 Service Manual

10

7) Five frequency points for SQL9 Off (Narrowband)

8) Five frequency points for SQL1 On (Wideband)

9) Five frequency points for SQL1 Off (Wideband)

10) Five frequency points for SQL1 On (Narrowband)

11) Five frequency points for SQL1 Off (Narrowband)

12) Five frequency points for QT (67.0Hz) Deviation
(Wideband)

13) Center frequency point for QT (67.0Hz) Deviation
(Narrowband)

14) Five frequency points for QT (151.4Hz) Deviation
(Wideband)

15) Center frequency point for QT (151.4Hz) Deviation
(Narrowband)

16) Five frequency points for QT (254.1Hz) Deviation
(Wideband)

17) Center frequency point for QT (254.1Hz) Deviation
(Narrowband)

18) Five frequency points for DQT Deviation (Wideband)

19) Center frequency point for DQT Deviation (Narrowband)

20) Five frequency points for Rx Sensitivity

21) Tx Low Voltage

4.4 Firmware Programming Mode

The radio is in possession with an internal Flash ROM which
can be upgraded when new features are released.
Procedure:

1. Press and hold the Top Key for over 2 seconds while turning the
radio power ON. The LED will light orange and the radio enters
the Firmware Programming Mode.

2. Run the firmware programming software KMU on PC.

3. Connect the radio to the computer by the programming cable.

4. Select a COM port and load the firmware upgrading file. Then
click on “E.P” to start downloading.

5. If the communication ends successfully, turn the radio power
OFF to exit.

6. If you want to continue programming other radios, repeat steps
1 to 5.

4.5 Wired Clone Mode

If the wired clone function is enabled, the radio can enter the
Wired Clone Mode. After entering this mode, the radio will not
exit automatically. The user needs to restart the radio if he wants
the radio to return to the User Mode.
The operation procedure is as follows:

1. Press and hold Side Button 1 while turning the radio power ON
to enter the Wired Clone Mode. If the wired clone function is

disabled, the radio will enter User Mode.

2. Connect the slave radio to the master radio by the cloning cable
and turn on the power of the slave radio.

3. Press Side Button 2 of the master radio to start cloning. The
LED on the master radio will light red, and the data of the master
is sent to the slave. While the slave is receiving the data, the LED
lights green. When cloning of data is completed, the LED of the
master will go out, and the slave will restart automatically.

4. Carry out the operation in step 3 to clone other slave radios.
Note: The user can enable or disable the wired clone function
through PC programming software. Once the wired clone function
is disabled, the radio cannot enter the Wired Clone Mode.

Chapter 5 Disassembly for Repair

The radio is a piece of precision communication equipment.
Please be careful when disassemble the radio during service. The
instructions for the disassembly are as follows.

5.1 Attaching and Removing the Battery

1) Attaching the Battery

Fit the two extensions at the top of the battery into the slots at

the top of the radio’s body.

Press the bottom part of the battery towards the radio until a

click is heard and the battery is hooked.

2) Removing the Battery

Push the battery latch at the bottom of the radio forward, the
bottom part of the battery will bounce up automatically. Then
release the belt clip and remove the battery from the radio’s body.
Note:

* Do not short-circuit the battery terminals or dispose battery
in fire.

* Do not disassemble the battery casing by yourself.

5.2 Installing the antenna

PT6700 Service Manual

11

No.

Name

Part number

Pcs

1

7MHR-7069-04A-W0

Main Waterproof Loop

1

2

7SMF-020080M-MH
HT-N1

M2*8 Machine Screws

1

3

Al cabinet assembly

1

4

7MHP-7069-02A-W0

Top Cover

1

5

7MHR-1727-09A-W3

MIC Seal

1

Hold the base of the antenna, and rotate it clockwise to the

connector on the top of the radio until it secures.

5.3 Installing the belt clip

5.4 Removing the mainboard from the Al chassis

1. Remove 11 screws on the PCB by a cross screwdriver;

2. Remove the solder of the antenna connector with a soldering
iron, and remove the mainboard.
See figure below:

Match the two holes of the belt clip with those on the rear of
the radio, and then fix the belt clip to the radio using the two
supplied screws. Loose the fixing screws to remove the belt clip.

5.4 Removing the chassis from the front cabinet

1. Remove the antenna;

2. Pull out the volume knob and the channel selector knob.

3. Remove the two nuts for knobs and the nut for the antenna

connector by the special tool;

4. Remove the two fixing screws at the lower part of the Al

chassis and remove the two fixing screws on two sides of the
cover;

5. Insert a flat-blade screwdriver into the slot at the bottom of

the Al chassis, and prize it up. Then pull the Al chassis
backwards to remove it from the front cabinet. Be careful not
to break the speaker wire.

See figure below:

5.5 Exploded View

PT6700 Service Manual

12

6

7MHR-7210-02A-W0

PT6700 Top Waterproof

Gasket

1

7

Mainboard assembly

1

8

PTT PCB

1

9

7MHS-7069-04A-W

PT7800 PTT key

1

10

7SMF-020040M-SZY
B-N

M2*4 Screws

12

11

7MHP-7210-04A-W0

Volume Knob

1

12

7MHP-7210-03A-W0

Channel Selector Knob

1

13

7MHS-1140-01A-W

Circlip for knob

2

14

7NRC-060100035-B
1

Nut for knob

2

15

7NRC-090115025-G1

Nut

1

16

Front cover assembly

2

17

7MHR-7069-08A-W0

O-type gasket

2

18

7SMF-025080M-SZY
B-Z1

M2.5*8 Screws

2

19

7MHP-7210-02A-W0

MIC cover

1

20

1

No.

Name

Part No.

Pcs

1

7MHP-7210-01A-W0

Front cover

1

2

7MHP-7069-03A-W0

PTT Side cover

1

3

7MHP-7069-04A-W0

PTT cover

1

4

7MHP-7069-06A-W0

Battery latch

1

5

7MHP-7069-10A-WC

Light guide

1

6

7MHR-7069-02A-W0

PTT key

1

7

7MHR-7210-01A-W3

Emergency key

1

8

7GCJ-S1867-01

Paste for earphone PCB
board

1

9

7MHS-1010-02A-N

Spring

2

10

7GCB-3950001

φ 39.5 Speaker net

1

11

4SS7-4564-016-100

φ 45 Speaker

1

12

7MHS-7210-01A-W

Fixed sheet for speaker

1

13

7GCB-070045005-J

3 对讲机 Φ7 话筒布

1

14

7SMF-020040M-SZY
B-N

M2*4 Machine screw

1

15

6PD7-1867-HLC

Earphone PCB board

1

16

6PF7-1867-HLC

7200 耳机连接软板

1

No.

Name

Part number

Pcs

1

7MHL-7069-01A-W

Al bracket

2

3CR7-SMA-50JFB-4

RF co-axis connector

3

7SMF-020040M-SZYB

-N

M2*4 machine screw

4

7MHR-7069-07A-W0

water-proof gasket for
bracket

5

7MHR-7069-05A-W3

Water-proof gasket for
dormer

6

7MHF-7069-02A-W

dormer cover

No.

Name

Specifications

1

Computer

P2 or above, IBM compatible PC, WINDOWS
98/ME/2000/XP Operating System

2

Programming
software

KSP6700

3

Programming
cable

4

Clone cable

KCL01

5

DC regulated
power supply

Output voltage: 13.8V
Output current: ≥ 20A

6

RF power
meter

Measurement range: 0.5-10W
Frequency range: 100MHz-500MHz
Impedance: 50Ω
SWR ≤ 1.2

7

Frequency
counter

Frequency range: 0.1-600MHz
Frequency accuracy: better than ±1×10-6
Sensitivity: better than 100mV

8

Deviation

Frequency range: DC600MHz

Front cover assembly:

Chapter 6 Adjustment

Before test/adjustment, make sure all equipment has been

grounded!

Before test/adjustment, make sure the antenna output
terminal has been correctly connected to corresponding equipment
or load!

The transmitter output terminal must be terminated with an

RF power attenuator and connected to a standard signal generator
(SSG)/frequency counter/deviation meter/spectrum analyzer!

Make sure no transmission operation is being conducted

while measuring the receiver!

During the adjustment/test/maintenance, make sure reliable

anti-static measures are taken for human body and equipment.

6.1 Equipment and Software Required for Test and

Adjustment

Equipment and software listed in Table 6.1 are required for test
and adjustment of PT6700.

Table 6.1 Equipment and Software Required for Test and

Adjustment

Al cover assembly: