Kirisun PT8200 User manual

PT8200
V070828
VHF /UHF MOBILE RADIO
SERVICE MANUAL

1
DANGEROUS!!
WARNING
STATEMENT
Do not connect AC power or the DC power that
exceeds the specified input value with any
connector or terminals of the radio. Otherwise it will
cause fire or electric shock.
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 tightly burning on skin.
It's better to avoid putting it in rain or snow, or any other
liquid to ensure its life and performance.
Kirisun Electronic (Shenzhen) Co., Ltd owns the copyright
of KSP8200 software.
Unauthorized Duplication of KSP8200 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 , , .
PT8200 SERVICE MANUAL
Chapter 1 Introduction ......................................................2
Chapter 2 Radio ................................................3
Chapter 3 ...................4
Chapter 4 Disassembly For Repair ..........................................5
Chapter 5 ..................7
Chapter 6 ..............................................9
Chapter 7 .............................10
Chapter 8 ...........................................................22
Chapter 9 ...........................................24
Chapter 10 ................................37
Chapter 11 ...............................37
Chapter 12 ................................... 38
Chapter 13 .....................38
Chapter 14 Appendix...................... .......................39
.......
Overview.......
Mode Combinations.................................
Circuit Description.....................................
Semiconductor Data..
Description of Components........
Adjustment
PCB Diagram..............
Interface Functions................
Packing...................................
Troubleshooting................
Specifications Parameters................
................
CONTENTS

2
Chapter 1 Introduction
1.1 Introduction
This manual applies to the service and maintenance of PT8200 series of
FM mobile radio, and is designed for the engineers and professional
technicians that have been trained by our company. In this manual you
can find all the information of product service. Kirisun reserves the rights
to modify the product construction 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 repair 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 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. Contact the
damaged antenna will cause lightly burning on the skin.
Repair service can only conducted by professional technicians.
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.
Any area of dynamite or exploder.
Change Components
All the components use 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 the following forms if you want to apply for any components
from Kirisun.
Component Application
Compo
Radio
M o
del/ Mate ria l Serial
Qua
No. No.
pecifications
nent Sntity
Model
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, 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.
Installation Condition
1.Unpack
Please check the host in the package and the supplied accessories in
the following table before using. Any articles are found lost or damaged,
please contact the distributor without delay.
2. Licenses
Rules require that the radio installation point (mobile station or base
station) needs permission license. The license carrier guarantees that
the RF power, frequency and frequency deviation comply with the
license requirements. The radio assembling or operation must be
conducted by the license-authorized technicians.
3. Installation Preparation
3.1 Description
Every radio has been adjusted and checked before the shipment. Before
installation it's better to check if the radio transmitting or receiving is
normal to make sure its proper operation.
3.2 Test
Connect all the cables and accessories to test the radio.
Transmitter frequency, deviation, and power output should be
checked, as should receiver sensitivity, squelch operation, and
audio output. Signllingoperation should beverified.
4. Installation Steps
4.1 Introduction
Check the car and decide how and where to install the radio antenna
and accessories. Allocate the cable in a proper place to avoid pressing
or squeezing it. And pay attention to the heat scattering of the radio
equipments.
4.2Antenna
The most ideal place for antenna is the center of an open and flat
conduction region. It usually at the center of the car top or at the top of the
luggage cabinet. Stick the ground wire at the top of the luggage cabinet
and the car outer shell and make sure to connect the luggage cabinet with
the ground.
4.3 Connection of Power Cable
First of all, please check whether there is a hole for the power
cable on the insulating board. If no, please bore the board with the
suitable drill bit and fix a rubber grommet on it.
Afterwards, please have the cable pass through the insulating
board and lead from the car into the car engine. Connect the red
PT8200 SERVICE MANUAL
1
1
1
1
4
2
4
Accessories
Fixed bracket
Power Cable
Hand Microphone
Microphone Hanger
M4*10 Combination Screw
M4*16 Self-tapping Screw
M5*16 Self-tapping Screw
Instruction Manual
1
Quantity
Fixed bracket
Power Cable
Hand Microphone
Microphone Hanger
M4*10 Combination
Screw M5*16 / M4*16
Self-tapping Screw

3
PT8200 SERVICE MANUAL
conductor to the positive terminal of the accumulator and the black con-
-ductor to the negative terminal.
At last, ring the remained conductor and fix it.
Note: Please maintain the sufficient relaxation of the power cable to
make it convenient to dismantle the radio in the state of power
connection.
4.4 Radio Installing
Warning: For passengers' safety, please fix the radio firmly on the fixed
bracket so that the radio will not be loosened in case of collision.
The fixed bracket is taken as an example. Draw the position and drill a
hole on the instrument panel first, and then install the fixed bracket with 4
M5*16 self-tapping screws. (Note: please fix the radio at the position con-
-venient for operation and control, and leave an enough space for fixation
and connection of the cable.)
Slide the radio into the fixed bracket and fix it with 4 M4*10 combination
screws (plus plain washer and spring washer). (Different combinations of
fixing holesare selectableto adjust the radio tothe properheight andvisual
angle.)
Connect the antenna and the power cable to the radio.
Install the microphone hanger at the position easy to use, with 2 M4*16
self-tapping screws. (The microphone and its cable should be fixed at the
position not affecting safe driving.)
Connect the microphone to the microphone jack on the front
panel of the radio and put it on the hanger.
Note: When replacing the protective tube for the power cable, please
use the one of the same specification without fail. It is not allowed to
change it into the tube of higher capacity.
4.5 If you do not intend to use the external speaker, fit the supplied speaker
-jack cap to stop dust and sand getting in.
Chapter 2 Radio Overview
1 power button
Press this button for a long time (more than 1.5 seconds) to swith the
radio on/off.
2 LED indicator
The red indicator will light while transmitting;the green indicator will
light when it receives the carrier.
The led flashes orange on received correct DTMF/2Tonesignalling.
The red indicator flashes in the scanning process.
2.1 Description of External View
3 / button (programmable button)
4 LCD display screen
For details, see LCD Display .
5 Volume Control knob
To be used to adjust volume.
6 Microphone/Programming Interface
7 button (programmable button)
8 button (programmable button)
9 button (programmable button)
10 button (programmable button)
11 PTT button (on the hand microphone)
Press the PTT button first, and then speak to the microphone to
transmit the voice to the other. Release to receive.
2.2 Display Screen
P1 P2 P3
Display Description
It means the receiving signal strength. 4 lines
means the strongest signal.
Transmission power level
L means the transmission of signal for the
radio at the lower power;
M means the transmission of signal for the
radio at the medium power;
P2
H means the transmission of signal for the
radio at the high power;
Call Received indicator.
The radio receives a selective call/call alert.
Monitor State Indicator.
Scan Indicator.
Companding Indicator.
Talkaround Indicator.
Scrambler Indicator.
OST Indicator.
2.3 Rear Panel
1 Antenna Interface
2 Power Interface
3 15-Pin Connector for accessories.
4 External Speaker Interface
2.4 Programmable Button Function
/ can be programmed as
one of the following functions.
Buttons Function Description
0. None No function
1.Channel Up Select the next channel
2.Channel Down Select the previous channel
3.Zone Up Select the next zone
4.Zone Down Select the previous zone
5.Display Channel
Frequency
6.Display Channel
Name
7.Display Mode
Switch
8.OST Change the setup of preset CTCSS/DCS for the
current channel.
Press this button and the LCD will show the
frequency of the current channel.
Press this button and the LCD will show the
name of the current channel.
Press this button and the LCD will show
Channel Number , Channel Name ,
Zone Number, Zone Name and Channel
Frequency alternately.

4
PT8200 SERVICE MANUAL
Buttons Function Description
11.Key lock To toggle between locking/unlockingyour radio
keypad.
12.Scan Start/end the scanning function of system.
13.Nuisance
Delete
14. Voice
Companding
15. Public
Address
16.Scrambler Enable or Disable voice scrambler function.
17. Home
Channel
18.Talkaround
19.VOX Selection
20. Monitor
momentary/
Call Cancel
When one channel continually generated
unwanted noise,this allow you temporary remove
the channel from the current active scan.
Start/end the voice compression/expansion
function.
Start/end the public address function.
Press this button and the function will be actived.
Press the PTT button and speak to the micro-
-phone so that you can hear your voice through
the external speaker . Press this button once
again and return to the normal user mode.
Changes to the home channels.
Enable or disable the VOX function.
Switch the radio between talkaround and
repeater mode.
Hold this button to close CTCSS, DCS, 2Tone
/DTMF signalling according to the set data.
Loosen this button to return to the normal
operation. Press this button in the selective call
Press this button to enter the Squelch Level
Adjustment Mode first, and then press the
/ button to adjust the level. Press the button
to save the selected squelch level and
quit this mode.
Press this button to make selection among the
high, medium and low transmission power, and
H , M and L will be shown on the LCD
to represent the current transmission power.
9.Power level
Selection
10.Squelch Level
Selection
21.Monitor/
Call Cancel
22.Squelch off
monmentary/
Call Cancel
23.Squelch off
/Call Cancel
24.Emergency
Alarm
25.Radio Call
Press this button to trigger this function and the
CTCSS, DCS, 2Tone/DTMF signalling will be
closed, so you can receive the signal that can't
be heard in the normal operation. Press this
button again to return to the normal operation.
Press this button in the selective call state to quit
such a state.
Hold this button to open the squelch. loosen this
button to return to the normal operation.
Press this button in the selective call state to quit
such a state.
Press this button to open squelch, press it again
to returm to normal operation.Press the button in
the selective call state to quit such a state
Enables the emergeney mode.
Press this button and to enter the shortcut menu
mode of Radio Call .For detailed operation,
see Menu Operation .
state to quit such a state.
26.Call Button 1 Sends the DTMF/2Tone code assigned to call
1 key.
27.Call Button 2 Sends the DTMF/2Tone code assigned to call
2 key.
28.Call Button 3 Sends the DTMF/2Tone code assigned to call
Buttons Function Description
29.Call Button 4
30.Menu Select
/Enter
31.Horn Alert
32.Tenancy
33.Lone worker
34.Scan List Edit
To enter the menu mode or make menu
selections.
Enables the horn alert
Enables lone worker function
Press this button and the radio will enter the
fast menu mode for scan list edit. For details,
see Menu Operation .
3 key.
Sends the DTMF/2Tone code assigned to call
4 key.
Press this button to view tenancy remained time.
35.GPS
Information View
36.VOX Level
Selection
Press this button and the radio will enter the
menu mode of GPS Information Menu.
Press this button to enter the VOX Level Adju-
-stment Mode . Press / button to adjust
VOX level. Press button to save the selected
VOX level and quit this mode.
Chapter 3 Mode Combinations
Mode Function Howto access
User Mode Fornormal use Poweron
Hold buttons and
, andconnect the
power at the same time
Hold while
connecting the power,
release to enter
the user mode.
Data Progra-
-mming mode
Test Mode
Firmware Pro-
-gramming Mode
Reading and writing
frequency data and
other functions
Receive instructions
from the PC
PC
Mode Used to tune the radio
using the PC.
Upgrades the software
when new features are
added
Receive instructions
from the PC
Receive instructions
from the PC
Wired Clone mode
Firmware Version
Information Display
Mode
Used to transfer
programming
data from one
radio to another.
Displays the firmware
version information
Mode combinations
Data programming mode:
Before leaving the factory, the radio has been set in factory. However,
due to different requirements of users, functional parameters of the
radiolikeworking frequency, channels,CTCSS/DCS and auto scanning,
etc. should bereset.Therefore, the company has specially designed a
set of Chinese/English programming software KSP8200 with friendly
interface, convenient operation and visualized display for setting
functional parameters of the radio.

5
PT8200 SERVICE MANUAL
Steps for setting the functional parameters of the radio by PC are as
follows:
A.Install KSP8200 on the PC.
B.As shown in the figure below, connect the radio and the serial port
of the PC with the special programming cable KSPL-05
C.Turn on the power of the PC.
D.Turn on the power of the radio.
E.Click on KSP8200 to perform the program and run KSP8200.
F.Inthemain menu ofKSP8200,click on [Read]toread the parameters
of the radio into the PC; click on [Write] to write the parameters set in
the PC into the radio.
G.As required by the user, the following parameter settings can be
made with KSP8200:
1 Programmable key functions
2 Alert tone
3 Optional functions
4 2-tone/DTMF/MDC/5-tone signaling setup
5TOT
6 Emergency alarm
7 Personality template
8 Scanning function
9 Channel data
Please refer to the Help document of KSP8200 for details.
Caution:
1 Turn off the power of the radio before connection.
2 When reading data from the radio, the indicator of the radio is green,
do not press the PTT during programming; when writing data to the
radio, the indicator of the radio is red.
3 Before editing for the first time, the data should be read from the
radio and properly backed up.
4 If the edited data cannot work normally after being written into the
radio, please open the backup data and rewrite them.
5 Model Information is important information of the radio and
should not be altered.
6 Upon completion of the programming, the radio will be automatically
restarted and return to the User Mode.
PC
(RS232 serial
port)
Programming
cable
KSPL-05
Radio
(MIC/Program
port)
Figure 5-1
Test Mode
According to Figure 5-1, connect the radio and the serial port of the
PC with the special programming cable.
Warning: Before entering the Test Mode, please first connect a high-
frequency load of 50 ohm to the antenna port of the radio or connect
the radio to a comprehensive tester.
With the KSP8200 software, enter the adjustment status in the Comp-
-uter Test Mode, you can adjust the following parameters of the radio:
1)Frequency
2)Low/Med/High Power;
3)Max deviation
4)Tone deviation
5)DTMF deviation
6)MSK deviation
7)DCS balancing
8)DCS deviation
9)VOX1-level/10-level
10)CTCSS(67Hz) deviation
11)CTCSS(254.1Hz) deviation
12)Receiving sensitivity
13)9-levle/1-level Squelch open
14)9-levle/1-level Squelch close
15)RSSI
Firmware Programming Mode
The radio is equipped with FLASH ROM internally, when new fea-
-tures are announced, it can be upgraded.
1).Connect the power and enter the User Mode.
2).Run PC software KMU.
3).Connect the radio and the PC with the programming cable.
4).Selectthecorrect serial port,selectsuitable baud rate according
to the actual situation, 19200 is recommended, and then click on
E.P or E.P.R for downloading. The LCD displays FIRM-
-WARE
5).Press OK to quit after the communication is successful.
6).Just repeat steps 1-5 if you want to program more radios.
Chapter 4 Disassembly For Repair
Exploded view ofthe radio
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
09
08
07
06
05
04
03
02
01
N
6800 knot circlip
PT7200 coding switch nut
PT8200 static protection film
PT8200 dustproof screen for horn
Horn
B/W twisted-pair
PT8200 horn gasket
Flat cable
M3.0x25.0 machine screw
PT8200 aluminum alloy lower cover
PT8200 power module screen
M3.0x6.0 machine screw
Electric cable
PT8200 e-material of main board
M2.5x5.0 machine screw
PT8200 metal baffle
PT8200 plastic buckle
PT8200 horn hole plug
M3.0x10.0 sems screw
PT8200 antenna head
Silver-coated jumper cable
PT8200 upper/lower cover gaskets
PT8200 Aluminum alloy upper cover
PT617A VCO screen
PT8200 L/R gaskets of panel
PT8200 Lower gasket of panel
PT8200 Upper gasket of panel
M2.6x6.0 tapping screw
PT8200 E-material of keyboard
PT8200 LCD
PT8200 silicon key
PT8200 light guide
PT8200 lens
PT8200 plastic panel
PT8200 volume knob
Name
203-006800-R26
203-007200-R08
204-008200-R08A
204-008200-R07A
121-100000-R19
120-400000-R04
204-008200-R06A
120-400000-R05
301-30250D-R01
203-008200-R02A
203-008200-R05A
301-30060G-R01
120-100000-R15
602-082001-H01
301-25050J-R01
203-008200-R04A
201-008200-R03A
202-008200-R02A
303-30100G-R01
203-008200-R03A
120-500000-R08
204-008200-R04A
203-008200-R01A
203-00617A-R01
204-008200-R03A
204-008200-R02A
204-008200-R01A
302-26060D-R01
602-08200K-H01
107-008200-R01
202-008200-R01A
201-008200-R05A
201-008200-R04A
201-008200-R01A
201-008200-R02A
Material Code
1
1
1
1
1
1
1
1
9
1
1
8
1
1
6
1
1
1
7
1
1
2
1
1
2
1
1
6
1
1
1
1
1
1
1
Quty.
O.

6
PT8200 SERVICE MANUAL
. Instruction for disassembly of the station for maintenance
1 RF-PCB Disassembly
.Release the 9 screws (M3x25) for the upper and lower covers, open
the aluminum alloy lower cover (see the left figure below).

7
PT8200 SERVICE MANUAL
.Release the 4 (M2.5x5) screws of the baffle and the 2 fixing screws
of the 15PIN DB socket, remove the metal baffle, the plastic buckle
and the horn hole plug (see the right figure above).
.Remove the power module screen, release the fixing screws of RF
-PCBand audiopoweramplifier,DC regulating IC,unplugthe flat cable
andthe horn cable, welderthe antenna head andthe power module to
separatethem from theRF-PCBwith the electriciron,carefully remove
the RF-PCB from the aluminum ally upper cover (see the left figure
below)
2 Instruction for disassembly of KEY-PCB
.Unplugthevolume knob, removetheknob circlip andtheswitch nub,
release the 2 M2.5x5 screws for the panel to separate the panel from
the station, separate the horn cable and the horn with an electric iron,
plug out the flat cable to separate the panel with the entire station thor-
-oughly (see the right figure above)
.Release the 6 (M2.6x6) fixing screws for KEY-PCB to take out the
KEY-PCB from the plastic panel (see the figure below)
After the disassembly above, you can carry out corresponding repara-
-tion and adjustment according to the actual malfunction.
Chapter 5 Circuit Description
Circuit composition
ANT SW
D31 D30 RF AMP Q26 IF SYSTEM TA31136
MCF
XF1 XF2
RF MAP
RA601317 MIC
AMP
MB15E03 PLL/VCO
CIRCUIT
AF AMP
TDA1519
1st
MIX
Q21
AUDIO
CONVERTER
AK2346
450KHZ
CF1 CF2
SP
MIC
AUTO
AGC
TCXO
16.8MHZ
RX/TX
SWD19 ½ UPB1509
DIVIDE
R AMP
Q23/Q25
16.8MHZ*3
APC
CONTROL MCU
LCD DRIVER
ALL I/O
Thereceivingcircuit adopts doubleconversionsuper-heterodyne mode.
The first IF is 49.95MHz; the second IF is 450kHz. The first local frequ-
-encysignalis provided bythephase-locked loop bycontrollingthe VCO
circuit. The 2nd local frequency signal is provided by the 16.8MHZ
crystal triple frequency.
The transmission frequency is generated by the phase-locked loop by
controlling VCO circuit via the frequency dividing circuit for further
frequency division. The composition ofthe circuit is shownin the figure
above.
Transmission Protection
The power module is provided with overheating protection when
transmitting.When the temperature ofthe power module ishigher than
the reference value, the communicator will switch the TX power from
highpower tolow power.Subsequently, if thetemperaturekeeps rising,
the transmission will be stopped
Over-voltage and over-current protection of the power
When the voltage is higher than the reference value of 18V, the
communicator will automatically switch the power control and turn on
oroffthe power. When thereceivingcurrent is higherthanthe reference
valueandwhen the polarityofthe power isreverse,the F841 onthePCB
of the station will automatically cut the power supply.
Receiving System
ANT SW
D31 D30 RF AMP Q26 IF SYSTEM TA31136
MCF
XF1 XF2
MB15E03 PLL/VCO
CIRCUIT
AF AMP
TDA1519
1st
MIX
Q21
AUDIO
CONVERTER
AK2346
450KHZ
CF1 CF2
SP
TCXO
16.8MHZ
RX/TX
SWD19 ½ UPB1509
16.8MHZ*3

8
PT8200 SERVICE MANUAL
1st High frequency amplifier
Signals entering the antenna enters RF amplifier (Q26) via the trans-
-mitting/receiving switching circuit (D30/D31) and the band-pass filter
(L48, L38 and variodes: D50, D26). After being amplified, the signals
are filtered by the band-pass filters (L30, L51 and the variodes: D21,
D22) before entering the 1st mixer (Q21).
1st mixer
Signals from RF amplifier and the 1st local frequency from VCO are
synthesized to generate the 1st IF of 49.95MHz. And then the 1st IF
enters the 2 single-chip crystal filter (XF1 XF2) for further elimination
of parasitic signals and then sent to the IF amplifier
IF amplifier
After being amplified by Q19, the 1st IF signal enters U102 (Ta31136).
When the signal is mixed with the 2nd local signal in U102 again, the
2nd IF signal of 450kHz is generated. Before being amplified, the 2nd
IFenters the 450kHzceramicfilter (broad: CF1,narrow:CF2) for further
elimination of unnecessary signals as well as modulation and demo-
-dulation in U102.
Parameters of thereceiving components
Item Rated Value
Rated central frequency 49.95MHz
Pass band width 5.0kHz or higherat 3dB
35dB stop bandwidth 20.0kHz or lower
Pulse 1.0 dBor lower
Insertion loss 5.0dB or lower
Guaranteed attenuation 80dB or higherat fo 1MHz
Parasitic signal:40 dB or
higher withinfo 1MHz
Terminalimpedance 350 /5.5pF
Table1 Crystal filterXF1/XF2
Item
Rated central frequency
Pass band width
35dB stop band width
Pulse
Insertion loss
Guaranteed attenuation
Terminal impedance
Rated Value
450kHz
6.0kHz or higher
12.5 kHz or lower
2.0 dB or lower
6.0 dB or lower
35.0 dB or higher within fo 100kHz
2.0k
Table2 Ceramic filterCF1
Item
Rated central frequency
Pass band width
35dB stop band width
Pulse
Insertion loss
Guaranteed attenuation
Terminal impedance
Rated Value
450kHz
4.5kHz or higher
10.0 kHz or lower
2.0 dB or lower
6.0 dB or lower
60.0 dB or higher within fo 100kHz
2.0k
Table3 Ceramic filterCf2
Broad/Narrow switching circuit
The broadband control port (pin 51) and narrowband control port (pin
52) of the CPU are used for switching between ceramic filters. When
the broadband control port is at high level, the ceramic filter SW diode
(D13, D15) allows the CF1 to receive broadband signals. When the
narrowband control port is at high level, the ceramic filter SW diode
(D13, D15) will allows CF2 to receive narrowband signals (The circuit
is shown in the figure below).
IF demodulation TA31136
1
CF1
Wide
CF2
Narrow
D13 D15
Narrow
U401 PIN52
Wide
U401 PIN51
R74 R78
R73
R77
PIN 5PIN3
Audio signal system
Detection signals from the IF IC (U102) enters the amplifier (U601) for
adjusting the gain and be outputted to AK2346(U404) for baseband
signal processing, the output signals are inputted to the audio power
amplifier(U11)for amplification andthenbe outputted fromthespeaker.
Squelch circuit
Noise signals outputted from FM IF chip (U102) output are amplified
bythevoice amplifier (Q78),theDC voltage correspondingtothe noise
level is regulated and outputted, the DC voltage is then sent to the
analog port of the CPU. U102 also outputs the DC level RSSI corres-
-ponding to the IF amplifier input signals.
Phase-locked loop frequencycombiner
The phase-locked loop and the voltage controlled oscillator circuit
produce the 1st local oscillation signal of the receiver and the transm-
-itting signals of the transmitter.
Phase-locked loop circuit
The frequency step of the phase-locked loop circuit is 2.5/5.0/6.25kHz.
The reference oscillator signal of 16.8MHz is divided in the chip U101
through a mixer counter to produce reference frequency of 2.5/5.0
/6.25kHz.Signalsoutputted from thevoltage controlled oscillator(VCO)
arebuffered andamplified via Q15 and thendivided by the dual-mode
programmable counter in chip U405. Signals amplified by Q15 are
compared with phase comparators carrying reference signals with
2.5/5.0/6.25kHz in chip U101. Signals output from the phase compar-
-ator controls the voltage to enter a low-pass filter and to control the
oscillation frequency through the voltage controlled oscillator.
Voltage controlled oscillator
The RF rate is generated via Q11 in the transmission mode, the recei-
-vingfrequencyis generated viaQ10in the receivingmode.The control
signalsgenerate voltage via thephase comparator to thevariode (D10
andD12 in thetransmissionmode, D9 andD11 in thereceivingmode).
In the receiving mode, Q12 is cut and Q7 is connected, in the transm-
-issionmode,Q12 is connectedandQ7 is disconnected.Outputsignals
from Q10 and Q11 are amplified by Q15 and sent to U405 frequency
divider.

9
PT8200 SERVICE MANUAL
Transmitting system
Block diagram
ANT SW
D31 D30
RF MAP
RA601317 MIC
AMP
MB15E03 PLL/VCO
CIRCUIT
AUDIO
CONVERTER
AK2346
MIC
AUTO
AGC
TCXO
16.8MHZ
RX/TX
SWD19 ½ UPB1509
DIVIDE
R AMP
Q23/Q25
APC
CONTROL
he transmitting circuit directly produces and amplifies the required
frequency and conducts frequency modulation for carrier signals via
the variode.
Transmitting drivingpower amplifier circuit
ANT
switch
D31 D30
Power
amplifier
RA601317
RX/TX
switch
D19
Drive
amplifier
Q23/Q25
Low-pass
filter
Transmittingsignalsfrom the voltagecontrolledoscillator are amplified
throughthe frequency division and transmission/receiving selector
diode(D19) andthedriving amplifier(Q23and Q25), thus providingthe
power moduleRA601317M/(RA554047M) with a special level. The
amplified signals then enter a low-pass filter. The low-pass filter
eliminates unnecessary high-frequency harmonics and the acquired
signals enter the antenna terminal.
Auto power control circuit
The auto transmitting power control (APC) circuit adopts the diodes
(D34, D36) to detect part of the power module outputs and provide
control voltage for U202. Through comparison with the reference
voltage outputted from MCU input, U202 generates the error voltage
and outputs from pin 7 of U202 to control the power amplifier Ra6013
17M and transmits output power stable. The composition of the auto
powercontrol circuit is forpreventing over current ofthe power module
dueto the fluctuationofthe load oftheantenna terminal andstabilizing
the output voltage and temperature change of transmission.
Control circuit
The CPU is provided with the following tasks:
1)Embedded Flash Rom, including the control program
2)Controlling the receiving circuit
3)Controlling the transmitting circuit
4)Controlling the display circuit
5)Various function control circuits
6)Communicating data with external devices
Storage circuit
The radio is provided with a 256k-bit EEPROM (U402) for storing pro-
-gramming or testing data.
Display circuit
The display circuit consists of the CPU (U401), the LCD component,
LED and other components. When the communicator is busy and the
LEDG cable is at high level, Q4 is connected and the green LED (D11)
is on. When transmitting, the LEDR cable is at high level, Q8 is conne-
-cted and the red LED (D12) is on, Led D1 to D4 provide the LCD back-
-light, which is on when operating the radio. The LCD is in the *
shape and can display up to 8 digits or letters.
Encoding
CTCSS/DCS:
Outputting CTCSS/DCS signals from the CPU(U401); one channel is
outputted from PIN24 via the low-pass filter and mixed with audio
signals and the external pin DI line, then inputted to the VCO for mod-
-ulation; the other channel is outputted from PIN28 output to TCXO(XI)
for modulation.
2-TONE/5-TONE/DTMF:
PIN2ofthe CPU outputs2-TONE/5-TONE/DTMFcoding signals, which
are inputted to the baseband processing IC (U404) via low-pass CR
filter for filtration and deviation control and then sent to the VCO for
modulation.
MSK:
MSK signal is generated by U404, through filtration and frequency
deviation control, it is outputted from PIN7 and sent to VCO for
modulation.
Decoding
CTCSS/DCS
CTCSS/DCS signals are processed and amplified by U403 filter and
sent to PIN92 of MCU for filtration and decoding.
2-TONE/5-TONE
2-TONE/5-TONEsignalsare filtered andamplifiedby U503 andreceive
waveform transformation via U801 (sine wave into square wave) and
then sent to PIN3 of MCU for filtration and decoding.
DTMF
DTMF signals are filtered and amplified by U503 and sent to PIN2 of
U803 (HT9172) for decoding.
MSK
MSKsignals are filtered,amplified and decoded byU404 and then sent
to MCU for MSK signal processing and control.
Power circuit
When the POWER switch on the front panel is pressed, the port
connecting the POWER on the display board and the terminal pins of
the CPU is at low level, Pin 80 (SBC) of the CPU is as high level, Q34
is connected, SB SW (Q42) is connected and supplying power to the
communicator (SB). This circuit is provided with the over-voltage prot-
-ection circuit. If 17V or higher voltage is provided to the power cable,
D839 will be connected and supply voltage to the base of Q38. This
voltage makes Q38 connected and Q34 and SB disconnected.
Chapter 6 Semiconductor Data
Processor: M30620
Pin
1
2
3
4
5
6
7
Port Name
PC/TV
DTMF
HSDI
EEP DAT
EEP CLK
BYTE
CNVSS
In/Out
O
O
I
I/O
O
I
I
Function
Transmit power and receive sensitivity
adjusting voltage output
DTMF/2Tone/5Tone/Beep output
Hi-speed data input
EEPROM data input/ output
EEPROM clock output
GND
GND