Do not connect the AC power or DC power over 8.6V
with any connector or terminals of the radio. Otherwise it will
cause fire or 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 avoid putting it
in rain or snow, or any other liquid to ensure its life and
performance.
This manual applies to the service and maintenance of PT4200
series of FM mobile 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.
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 lightly burning on the
skin.
Repairing service can only conducted by professional
technicians.
reconstructing the radio by the users without permission.
Wearing and tearing or any man-made sabotage 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.
Chapter 2 Radio Overview and Function Keys
2.1 Radio Overview
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.
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
Model Component No . Model/
PT4200-2 FET Q11RD07MVS1 105-RD07MV-001 1
PT4200-2 Triode Q52SC5108 Y 104-SC5108-001 1
PT4200-2 Belt ClipKBJ-05 1
1.3 Service
All the Kirisun products are subject to the service warranty.
The main unit of the radio is guaranteed for service of 18 months. In
one of the following situations, charge free service will not available.
No valid service warranty or original invoice.
Malfunction caused by disassembling, repairing or
Specifications
Material
Serial
Quantity
No .
LED Indicator
Lights red while transmitting; lights green while receiving a
signal.
Flashes red while in low battery power.
Channel Selector
Rotate to select channel 1-16.
Power/Volume Switch
Turn clockwise 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.
Monitor Button
Press to disable the SQUELCH, and release to enable the
SQUELCH again.
Channel Annunciation Button
Press it in standby state, and the channel number will be
annunciated. If press and hold this button, and at the same time
switch on the radio again, the type of voice annunciation of channel
number will be changed.
Emergency Button
Press and hold this button for over 2 seconds to activate
warning tone. Press it again to exit the emergency alert state.
Note: When warning tone sounds, all of the buttons are
disabled.
Microphone/Speaker Jacks
For connecting external Microphone/Speaker.
1
Page 4
PT4200 SERVICE MANUAL
Chapter 3 Electrocircuit
3.1 Frequency Configuration
Figure3.1 Frequency Configuration
This radio adopts the 2nd Mixer, the 1st IF 49.95MHz, the 2nd
IF 450kHz.
The receiver's first local oscillation is generated by the
frequency synthesizer. The second local oscillation is generated by
the crystal oscillator.
The transmitter signals are generated by frequency synthesizer.
The reference frequency of frequency synthesizer is generated
by TCXO.
3.3 Receiver (RX)
IC5 inner circuit and X3 (49.5MHz) compose the 2nd local
oscillator. The 2nd local oscillation (49.5MHz) and the 1st IF signal
(49.95MHz) are mixed at IC5 to generate the 2nd IF 450MHz .
After the 2nd IF signal is amplified and its amplitude is limited at
IC5, and then filtered at porcelain filter (CF1,450kHz), IC5
demodulates and sends out audio signals.
Figure 3.3IF System
Receiver Audio Signal Processing
IC6 and its peripheral circuit compose the receiver audio signal
processing circuit. IC5 sends audio signals to IC6-C for
amplification, and then to IC4 (CTCSS signaling filtering circuit) and
IC6-D. After the signals are amplified, de-emphasized, filtered at
IC6 and other cells, the HF (high frequency) and LF (low frequency)
will be eliminated, and the remaining 300-3000Hz audio is sent to
Q9 for amplification and then to volume potentiometer for
adjustment and finally sent to the audio amplifier (Ic8).
Figure 3.2 Receiver Illustration
The Receiver Front Terminal
Signals from the antenna pass through the RX/TX switch (D1,
D2, D4, D5); and then undesirable out-of-band signals will be
filtered out at the band pass filter (BPF) consisting of C227, L8, L15,
C70, C126, C218, L9, C217, L10, C127; then signals are amplified
at the low noise amplifier (LNA) consisting of Q20 and its peripheral
components.
The output from the LNA passes the BPF consisting of L5, L6,
L7, C228, C124, and C132 for filtering and then is sent to the first
grade frequency mixer (Q19).
MCU produces output voltages and alters the capacitance of
the variable capacitor diodes D21, D22, D23, D24, D26, D30 to
control the center frequency of the band-pass filter.
The First Frequency Mixer
After mixing the receiving signals and the first local oscillation
signals from the frequency synthesizer, the 1st IF signals
49.95MHz are generated. The first IF signals pass the crystal
filter (XF1, XF2) , which will filter the signals of adjacent channel
and those out of band.
IF Circuit
The 1st IF signals from the crystal filter are amplified at the first
IF amplifier (Q21), and then are sent to the IF processing IC (IC5,
MC3361). The IF IC consists of the 2nd frequency mixer, the 2nd
local oscillator, IF amplifier, limiter, phase frequency detector, and
noise amplifier.
Figure 3.4 Receiver Audio Processing
Squelch Circuit
Demodulation output from IC5 is sent to the selection frequency
noise amplifier, which consists of IC5 inner noise amplifier and
C107, R124, R152, C33, and C35, to be filtered off the noise. After
being amplified at Q7, noise is sent to D17 and D18 for wave
checking and then sent to MCU, which determines the noise
volume to control the squelch.
Audio Amplifier
IC8 and peripheral components construct the audio amplifier.
Receiving audio signals, voice indication signals, indication tone
signals and warning tone signals are collected for audio
amplification to drive the speaker. Warning tone has no volume
control.
When AFCO is at the high level, Q37, Q8, Q33, and Q38 will be
connected, and IC8 starts working and voice comes out from the
speaker.
Q36: Receiving audio signal switch
Q35: Warning tone switch
Q25: Indication tone switch
2
Page 5
PT4200 SERVICE MANUAL
CTCSS Signal Filtering
The IC5 demodulated output audio signals may contain CTCSS
(continuous tone coded squelch system) and DCS (digital coded
squelch). The frequency spectrum of CTCSS/DCS is 2-250Hz. The
filtering circuit constructed by IC4 can filter out the signals out of the
CTCSS/DCS frequency spectrum to ensure MCU to decode
CTCSS/DCS more precisely.
3.2 Transmitter (TX)
Transmitter Amplifier
Figure 3.5 Amplifier and Antenna Switch Diagram
The modulated signals from VCO are amplified at Q2, Q3, and
Q12 and then are sent to Q11 for amplification. Q11 output power:
4.5W.
The Q11 and Q12 gate offset is controlled by APC circuit.
Changing gate-offset voltage can control the transmitter output
power conveniently.
APC (Auto Power Control)
Figure 3.6 APC Circuit
R167, R168, and R169 are the amplifier current checker; IC3A
is the sample amplifier of the amplification current; IC3B is the
power comparison amplifier.
If the transmitter output power is too big, the amplifier current
will increase, IC3A output will mount, IC3B output voltage decrease,
the offset voltage added to Q11 and Q12 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 input power to IC3B to set the power.
Transmitter Audio Signal Processing
amplified, the amplitude of them is limited, and are filtered, they are
sent to VCO together with CTCSS/DCS for modulation.
D13, D308, and Q24 constitute AGC circuit which decreases
signal amplitude to avoid signal distortion when MIC signal is too
big.
Q34 is the power switch of audio processing circuit. It supplies
power to IC7 only when in transmitting and it is controlled by MCU.
J2 is the external MIC socket. When external MIC is used, the
inner MIC will cut off automatically, but PTT will remain activated.
3.3 Frequency Synthesizer
Figure 3.8 Frequency Synthesizer
The radio adopts PLL (Phase Locked Loop) frequency
synthesizer.
The frequency synthesizer consists of standard oscillator,
voltage controlled oscillator (VCO), programmable frequency
demultiplier, phase comparator, and low pass filter.
Q14, L30, C120, C88, C142, C180, D8, and D9 constitute RX
VCO. D12 is the modulation circuit of VCO.
ICI (MB15E03) is PLL integrated circuit, including
programmable reference frequency demultiplier, programmable
swallowing frequency demultiplier, phase comparator, and charge
pump.
R244, c193, R202, R40, C207, R141, C205, R2, and C204
construct the low pass filter.
The standard frequency is supplied by X4 (TCXO, 13MHz).
The standard frequency fromTCXO (Temperature Control
Transistor Oscillator) are demultiplied by the programmable
reference frequency demultiplier at IC1 to acquire 5kHz or 6.25kHz
reference frequency (controlled by MCU according to the preset
channel frequency).
The oscillation frequency from VCO is sent to IC1, and
demultiplied by swallowing 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=FVCO/FR
N Frequency demultiplication times
FVCO VCO oscillation frequency
FR Reference frequency
Figure 3.7 Transmitter Audio Circuit
IC7 and the peripherals components construct the transmitter
audio processing circuit. After the audio signals from MIC are
3
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 tome.
Q6: Power filter to supply more pure power to reduce the noise
of the frequency synthesizer.
3.4 Voice Indication Circuit
The radio features voice indication, which is very useful at night
or in the environment of dim light.
Page 6
IC15 is a voice memory chip which stores the voice indication of
channels, and every time you change the channel, the speaker will
sound voice annunciation of the current channel number. Press
voice annunciation key will repeat the voice annunciation of the
current channel number.
If the voice annunciation function has been set, press voice
annunciation key in the stand by mode and the speaker will
sound voice annunciation of the current channel number. If turn on
the radio again with the voice annunciation key pressed, the
voice type will be changed. Repeat turning on the radio with the
voice annunciation key pressed, the voice type will change in the
sequence Chinese Male--- English Male--- Chinese Female --English Female ---- No Indication .
3.5 Power Supply
The radio is equipped with 7.4V, 1200mAh Li-Ion battery. The
battery supplies power directly to the transmitter amplifier circuit
(Q11, Q12) and the receiver amplifier (IC8). The power supply of
other circuits is the regulated 5V power.
IC12: 5V low voltage difference, micropower regulator, together
with Q10, and Q30 supply big current 5V power to the whole radio.
Q29: 5T switch, controlled by MCU.
5T: Supplies power for the front terminal of the transmitter.
Q31: 5R switch, controlled by MCU.
5R: Supplies power for the receiver RF amplification, mixing, IF
processing, audio signal processing.
Q32: 5C switch, controlled by MCU
5C: The 5V power controlled by power saving supplies power
for the frequency synthesizer.
3.6 MCU
PT4200 SERVICE MANUAL
Memorizer E2PROM AT24C08
Memorizes the radio channel data, CTCSS/DCS data, and
other data of function setting and parameter adjustment.
CTCSS/DCS Encoding and Decoding
CTCSS/DCS signals generated by MCU (output form pin5) are
filtered at R155, R156, C242, and C243, and then sent to VCO and
TCXO for modulation.
CTCSS/DCS signals from the receiver are sent to MCU(pin1)
for demodulation. 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 P56 output is sent to APC part to control the transmitter
output power.
CTCSS
CTCSS (continuous tone control squelch system) is a squelch
control system modulated on carrier wave with continuous subaudio
frequency as pilot frequency. If a channel is set with CTCSS, only
when both the CTCSS of the receiver and that of the transmitter are
identical, communication is available, which avoids interference of
other signals.
39 groups of standard CTCSS frequency is available on the
radio, see Table 3.1.
CTCSS signals generated by MCU pass the low pass filter
consisting of RC to be filtered off the high frequency over 300Hz
and then are sent to VCO for modulation.
Figure 3.9 MCU Diagram
MCU controls the working of each unit of the radio to realize all
the radio functions.
Connects with the PC
Accesses the radio status data
Controls PLL to generate the receiving and transmitting local
oscillation frequency.
Accesses the current channel status.
Controls the LED status indication
Controls the power supply of each location
Checks the action of each function key
Generates CTCSS signals
Generates DCS signals
DCS decoding
Squelch check and control
Controls the content of voice indication
Table 3.1 CTCSS Frequency Table
.
No
FREQUENCY
(Hz)
1 67.0131.8
2 69.3136.5
3 71.923141.3
4 74.424146.2
5 77.025151.4
6 79.726156.7
7 82.527162.2
8 85.428167.9
9 88.529173.8
10 91.530179.9
11
12
13
14
15
16
17
18
19
20
94.8
97.4
100.0
103.5
107.2
110.9
114.8
118.8
123.0
127.3
No
.
21
22
31
32
33
34
35
36
37
38
39
FREQUENCY
(Hz)
186.2
192.8
203.5
210.7
218.1
225.7
233.6
241.8
250.3
4
Page 7
PT4200 SERVICE MANUAL
DCS
DCS (digital code squelch) is a kind of continuous digital code
modulated with voice signals on carrier wave to control squelch.
83 groups of standard codes (positive and inverse code) are
available. See table 3.2.
DCS signals generated by MCU (PWM wave shape) pass the
low pass filter to be filtered off the high frequency over 300Hz and
then are sent to VCO and TCXO for modulation. VCO modulates
the high frequency of DCS signals; TCXO modulates the low
frequency of DCS signals.
CTCSS/DCS signals from the receiver are sent to MCU for
modulation. MCU determines whether the DCS encoding of the
receiving signals is identical with that set on the radio and decides
whether to turn on the speaker.
Table 3.2 DCS Encoding List
023114174315445631
025115205331464632
026116223343465654
031125226346466662
032131243351503664
043132244364506703
047134245365516712
051143251371532723
054152261411546731
065155263412565732
071156265413606734
072162271423612743
073165306431624754
074172311432627
3.7 Semiconductor Component
MCU Description
Table 3.3 Microprocessor (M38034) Port Description
Port
No
.
1TIP1 I
2BUSYP2 I Busy s ignal in put
3BATTP3 I Ba ttery vo ltage check
4ALARM P4IAlarm key check
5TOP5 O QT/DQT output
6BEEPP6OBeep output/warning tone output
7
8
9
10
11
12
13
14
15
16
17 SELFP17I Self programming
L: Model setting mode
18 CNVSS P18IConnect 10K resistor with VSS
19 RST P19I R e seti nput
20 INT0 P20I P o w er ch eck in put
Name
PF1
ENC0
ENC2
ENC3
ENC1
NC
PTT
TXD
RXD
MONI
Pin
Name
I/O
QT/DQT signal input
P7I Voice indication key check
P8IEncoding input
P9IEncoding input
P10IEncoding input
P11IEncoding input
P12I Not used
P13I [PTT] key input, connected with RXD
P14O RS-232C input
P15I RS-232C input
P16I [MONI] key input
FunctionPin
5
21ENC P21 I
-SEL
Connect the pull down resistor with
VSS .
22XINP22 I7.3MHz Osc illator
23XOUTP23 O
24VSSP24 I
25SHIFTP25 O
26PABCP26 O
27OSCSIP27 I
28WNTCP28 OWide/Narrow band contro l
H Wide L Narrow
29PSP29 O PLL p ower s aving co ntrol H No rmal
working L Power saving
30SDAP30 I/OEE PROM data wire
31SCLP31 OEE PROM cloc k wire
32ULP32 I PLL unlock che c k pinH Locked
33DTP33 O PL L data output
34CKP34 O PL L clock output
35LEP35 O PLL IC en abl i n g pinH L atched
365MCP36 O Power control excep t CPU and
EEPROM L Open
37AFCOP37 O
38RXP38 O TX/RX VCO Se l e c tion H Rece iving
39GLEDP39 OGree n indicato r contro l H Ligh t
40RLEDP40 ORe d indicato r contro l H Light
41SAVEP41 O Battery power saving c o ntrol
H Power supply L Power saving
42MUTEP42 OSquelc h contro l
HL Audio squelch
435RCP43 O
445TCP44 O
45W588CP45 O
46ACP46 O
47DAOUT1P47 O
48DAOUT0P48 O
49DAOUT7P49 O
50DAOUT6P50 OD/A output6
51DAOUT5P51 OD/A output5
52DAOUT4P52 OD/A output4
53DAOUT3P53 OD/A output3
54DAOUT2P54 OD/A output2
55NC P55 O Not used
56APCP 5 6 O
RX BPF tuning output
57VCCP57I CPU pow er 5V input
58VREFP58IConnected with VCC
59AVSSIConn ecte d with VSS
60IF_SEL
resistor with VSS H 49.95 L 21.4
P59
P60
Encoding switch selection.
Earthing
Clock frequency shift HOpen
Final power supplyH Open
VCO crystal selection.
Connect the pull down resistor with
VSS H 13 L 16.8
L Loss of lock
Audio amplification power H:Open
Mic squelch
eceiving power control L Open
R
Transmitter power control H Open
Voice indication H Voice
annunciation of channel
Alert control H Control by voice
volume.
It must be in low battery
when in emergency alert state
D/A output 1
D/A output 0
D/A output 7 frequency regulated
output VCCN
TX Auto power contro l outpu t
I
IF selection. Connect the pull down
level
.
Page 8
PT4200 SERVICE MANUAL
61BUSY_V P61 IVoice indication of circuit busy check
62DATA_V P62 I/OVoice indication data
63SCLK_V P63 I/O Voice indication clock
64NC Not used
3.4 Semiconductor Function Description
Posi
Type Function Description
IC1 MB15E03Frequenc y synthesizer
IC4 NJM2904APC Voltag e comparison , driv e
IC5 MC3361Receiver' s 2n d loca l oscillation , 2n d I F
IC6 NJM2902Receive r demodulatio n signa l
IC7 NJM2902
IC8 KIA6278F
IC9 AT24C08
function setting parameter,
IC10 M38034
IC11 PST9140NR
IC12 HT7150-1Lo w voltag e differenc e, lo w powe r
IC15 W588A080Voic e storag e I C
Q22SC5108Transmitt er 1 st amplification
Q32SC3356Transmitt er 2n d amplificatio n
Q42SC5108VC O bufferin g amplifi er
Q52SC5108VC O bufferin g amplifi er
Q62SC4617VC O pow er filter
Q72SC4738Nois e amplifier
Q92SC4617Receiv er aud io signa ls amplification
Q10 2SC16235 V regulate d outp ut curre nt stretch er
Q11 RD07MVS1 Transmitter fina l pow er amp lifier
Q12 RD01MUS1 Transmitter pow er amp lifier driv e
Q17 DTA144EE AP C outp ut switc h
Q19 3SK318Th e 1 st frequenc y mix er
Q20 3SK318Receiv er H F amplifi er
Q21 KTC4082Th e 1 st IF amplifier
Q22 DTC144EERe d LE D driv e
Q23 DTC144EEGree n LE D drive
Q24 2SK1824Voic e indicatio n switch
Q26 DTC144EE5 C switc h
Q29 KTA12985 T switc h
Q30 KTA12985 V regulate d outp ut curre nt stretch er
Q31 KTA12985 R switc h
Q32 KTA12985 C switc h
Q34 DTA144EEPow er switc h of M IC amplificatio n un it
Chapter 4 Function Description and Parameter
Setting
4.1 Major Functions
4.1.1 16 Channels/15 Channels +Scanning Channel
The radio stores 16 channels including one scanning channel.
4.1.2 Scanning Function Control
If you switch the channel to channel 16, the radio is in the
scanning state. After starting scanning, it will pause when receiving
signals.
If you switch the channel to channel 1-15, the scanning function
is inactivated.
4.1.2.1 Carrier Wave Control Scanning
If the radio scanning setting is carrier wave control
scanning , switch the channel to channel 16 to set the radio in the
scanning working mode.
Each channel can be set the scanning added/deleted function
solely: if the setting is scanning added, the channel will be added in
the scanning list; if the setting is scanning deleted, the channel will
not be in the scanning list.
The radio starts scanning from channel 1 to 16 repeatedly in the
consequence of the scanning list. If signals are detected on a
channel ( if the channel is set with receiving signaling the carrier
wave must match the signaling), the radio pauses on that channel
and will restarts scanning 0.5~5 seconds (scanning delay time) after
the signals disappear.
If you switch the channel to channel 1~15, scanning is
inactivated.
4.1.2.2 Time Control Scanning
If the radio scanning setting is time control scanning , switch
the channel to channel 16 to set the radio in the scanning working
mode.
Each channel can be set canning added/deleted function solely:
if the setting is scanning added, the channel will be added in the
scanning list; if the setting is scanning deleted, the channel will not
be in the scanning list.
The radio starts scanning from channel 1 to 16 repeatedly in the
consequence of the scanning list. If signals are detected on a
channel (if the channel is set with receiving signaling the carrier
wave must match the signaling), the radio pauses on that channel
and will restarts scanning 0.5~5 seconds (scanning delay time) after
the signals disappear.
If you switch the channel to channel 1~15, scanning is
inactivated.
7
4.1.2.3 Priority Channel
You can set one channel in the scanning list as the priority
channel, which has the highest priority during scanning. The radio
scans the first non-priority channel in the canning list and then
scans the priority channel, the next non-priority channel in the
scanning list, and then the priority channel again. It goes on
scanning in such sequence.
4.1.2.4 Revert Channel
If you press PTT button when the radio is in scanning state, the
radio will transmit on the revert channel , which has 6 types:
Selected channel: The first channel in the scanning list.
Selected channel + current channel: If the radio is in the state of
scanning pause, it will transmit on the current communication
channel. Otherwise it will transmit on the first channel in the
scanning list.
Priority channel: The radio will always transmit on the priority
channel set in the scanning list when pressing PTT.
Priority channel + current channel: If the radio is in the state of
scanning pause, the radio will transmit on the current
communication channel. Otherwise it will transmit on the priority
channel in the scanning list.
Last called channel: The last channel that received signals.
Last called channel + current channel: If the radio is in the state
of scanning pause, the radio will transmit on the current
communication channel. Otherwise it will transmit on the last called
channel.
The current communication channel is the channel on which the
radio pauses in the 4 following situations:
1When the radio receives signals and does not restart
scanning, the radio will stay on the current channel.
2The radio will stay on the current channel during 0.5~5
seconds (scanning delay time) after signals disappear.
3The radio will stay on the current channel when pressing
the PTT during scan.
4After releasing the PTT to end transmitting, during the
preset transmitting dwell time, the radio will stay on the current
channel. After the preset transmitting dwell time 0.5~5 seconds, the
radio will restart scanning again.
4.1.2.5 Retrace Period
If the priority channel has been set in the scanning list and
retrace period is also set, when the radio receives signals on a nonpriority channel and pauses scanning, it will retrace the priority
channel in a certain period (0.3~5s). If signals are detected on the
priority channel, it will stay on the priority channel; if no signal is
detected on the priority channel, it returns to the original channel it
stays on.
4.1.3 CTCSS/DCS
CTCSS/DCS can realize selective calls and group calls. On the
same channel, only the two parties whose CTCSS/DCS are
identical can communicate. CTCSS/DCS signaling code on the
channel is preset.
4.1.4 TOT
The purpose of the time-out timer is to prevent any single
person from overlong using a channel to transmit and affecting the
whole group communication.
If the radio transmits longer than the preset TOT time limit, the
radio will stop transmitting and warning tone sounds. To stop the
warning tone, release the PTT button. Press the PTT again you can
resume transmitting.
4.1.5 Auto Power Saving
When no signals are being received or no operations are being
Page 10
PT4200 SERVICE MANUAL
conducted for over 10 seconds, the battery power saving will be
activated. When it is receiving signals or in operating state, battery
power saving is inactive.
4.1.6 Low Battery 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. When the speaker sounds warning
tone, the radio will stop transmitting.
4.1.7 Monitor
When no signals are being received, the radio squelch circuit
mutes the speaker.
Press the MONI key to cut off the squelch control circuit, and
you will hear noise from speaker (no mater whether there are
signals). Such operation is very useful when you want to adjust
voice volume or receive weak signals (to avoid voice intermittence
when in weak signals).
When you press the MONI key, the green indicator lights, and
the radio is in the state of monitoring.
4.1.8 Busy Channel Lockout
If busy channel lockout has been activated, transmitting
signals is prohibited on the busy channel. If you press the PTT to
transmit on the busy channel, the speaker will sound busy channel
lockout tone, and you cannot transmit signals.
4.1.9 PC Programmable
You can program the radio functions and adjust some
parameters by PC programming software KSP20.
4.1.10 Wired Clone
The radio can transfer the stored data to another radio of the
same mode by a specified cable.
4.1.11 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.
4.1.12 Beep Tone
This option controls power on tone, channel busy tone and TOT
tone.
4.2 Parameter Setting (PC Mode)
The radio parameters have been programmed in the factory.
The user can program the radio parameters such as working
frequency, channels, CTCSS/DCS, auto scanning. We designed a
user friendly and convenient Chinese/English programming
software KSP20 for users to set parameters on the radio. The
programming steps are as follows:
a.Install the programming software KSP 20 on the computer.
b.Connect the radio to the computer serial port with the
specified programming line (KSPL02). See Figure 4.1
a.Turn on the computer power.
b.Turn on the radio power.
c.Click the KSP20 program to run the programming software.
d.Click the Tools in the KSP20 pull-down menu, and click
Read Data to read the radio parameters into the computer;
click Write Data to transfer the PC programming parameters
into the radio.
e.You can program the following parameters with the KSP20
software.
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) Power saving option.
7) Beep tone option.
8) Monitor mode option.
9) Scan mode option.
10) Scan the revert channel option.
11) Scan the priority channel option.
For more details, please refer to the Help in the KSP20
software.
Notice:
1) Turn off the radio before connection.
2) When the radio is being read data, the indicator lights green
and it's prohibited to press the PTT button; when the radio is being
written data, the indicator lights red.
3) Before the first time editing, you should read data form the
radio 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.
6) After programming, you need to turn on the radio power
again to make the radio resume the normal work.
4.3 Computer Test Mode:
Connect the radio to the radio communication port with the
specified programming line (KSPL02). See Figure 4.1.
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 KSP20 programming software:
1) Frequency tuning;
2) Transmitting power;
3) Low voltage threshold;
4) The 9th squelch level;
5) The 3rd squelch level;
6) Sub-audio wide band modulation degreed;
7) Sub-audio narrow band modulation degreed;
8) Wide band sub-audio center.
PC
(RS232 Serial
Port)
Programming
Line (KSPL02)
Radio
(Speaker/ Mic
Socket)
4.4 Wired Clone (It can be prohibited by programming
software)
When the wired clone function is activated, the radio can enter
the wired clone mode. After entering the wired clone mode, the
8
Page 11
PT4200 SERVICE MANUAL
radio will not exit it automatically and you have to turn on the radio
again to enter the user's mode. Operating steps are as follows:
1) Turn on the radio with the MONI key pressed, and 2 seconds
later the red light flashes twice and two beep tones sound, and then
the radio enters the wired clone mode.
2) Press the PTT button on the host radio to activate/inactivate
the wired clone mode on the sub radio. But the wired clone mode of
the host radio will not be changed. When pressing the PTT button,
the green light flashing twice and one beep mean to activate the
clone mode; the red light flashing twice and two beeps mean to
inactivate the clone mode. When entering clone mode, the default
setting of the sub radio receiving data is to prohibit wired clone
mode.
3) Press the MONI key, red light flashes, and it starts cloning.
After cloning is finished, the red light turns dim.
Note: You can activate/inactivate the wired clone mode. Short
circuit the two SELF terminals, enter the model setting mode and
then the manually adjustment function and wired clone function will
become active automatically. If you press the MONI key at this
moment, the wired clone function will be prohibited.
You can also activate/inactivate the wired clone mode by PC
programming software.
If the wired clone function has been prohibited, it cannot enter
the wired clone mode. The wired clone mode has been prohibited in
the factory.
The cloning data includes all the data in 4.2 Parameter
Setting but the adjustment parameters in 4.3 Computer Test
Mode .
Cloning Line
Host Radio
Sub Radio
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
clip away from the radio.
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 to lock it in place. (See Figure 5.4)
Figure 5.4
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;
5) Pull the aluminum alloy frame out of the casing.
See Figure 5.5
Chapter 5 Service Assemble and Disassemble
The radio is a precision communication equipment. Please be
careful when assemble or disassemble the radio during service.
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)
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.
Figure 5.5
5.4 Remove the Chassis from the Main Board
1) Remove the screw of from the PCB;
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.
Figure 5.2
9
Figure 5.3
Figure 5.6
Page 12
5.7 Exploded View
41
42
43
44
40
39
38
37
36
35
34
33
32
31
21
30
20
PT4200 SERVICE MANUAL
29
28
27
26
25
24
23
22
18
17
16
15
19
NO.
MATERIAL NO.
21
202-000558-009
20
204-006800-006
19
202-000558-001
18
201-000558-008
17
202-000558-003
16
201-000558-002
15
201-000558-003
14
203-003208-009
13
203-000558-002
12
203-000558-001
11
202-000558-004
10
202-000558-005
9
201-000558-009
8
204-000558-001
7
121-100000-007
6
201-000558-001
5
401-0101E1-057
4
203-000558-004
3
202-000558-002
2
201-000558-004
1
401-0101E1-058
DECRIPTION
MIC CAP
MIC WASHER
MIC COVER
EMERGENCY BUTTON COVER
EMERGENCY BUTTON
VOLUME KNOB
CHANNEL KNOB
KNOB CIRCLIP
SWITCH NUT
ANTENNA NUT
arial
arial
LIGHT PIPE
SPEAKER WATERPROOF NET
SPEAKER
FRONT COVER
LOGO LABLE
SPEAKER SPRING
PTT BUTTON
PTT BUTTON FRAME
MODEL LABLE
QTY
1
1
1
1
1
1
1
2
2
1
2
1
1
2
1
1
1
2
1
1
1
44
204-000558-003
43
301-20080G-001
42
401-0201C1-006
41
204-000558-002
40
301-25060J-001
39
201-000558-014
38
203-000558-005
37
201-000558-005
36
203-003208-004
35
203-004200-001
34
204-000558-005
33
203-000558-007
32
202-000558-007
31
202-003208-007
30
302-17040G-001
29
203-003208-002
28
202-000558-008
27
201-000558-007
26
202-000558-006
25
204-003208-005
24
204-000558-004
23
22
301-20040G-001
14
13
12
11
10
9
8
7
6
5
4
3
2
1
AL LABLE
M2 SCREW
AL LABLE
WATERPROOF LABLE
M2.5 SCREW
PUSH FASTENER
PUSH FASTENER SPRING
TOP COVER
arial
Aluminum bracket
AL ALLOY LABLE
ANTENNA HEAD
WATERPROOF WASHER
INSULATING WASHER
M1.7 SCREW
arial
POSITIVE TERMINAL WASHER
POSITIVE TERMINAL FRAME
WASHER
WASHER
WASHER
PCB BOARD
M2 SCREW
1
2
1
1
2
1
1
1
1
1
1
1
1
1
1
1
2
1
1
2
2
1
11
10
Page 13
PT4200 SERVICE MANUAL
Chapter 6 Radio Debugging
Before test/debugging, make sure all the equipments have
been well connected to the ground.
Before test/debugging, make sure the antenna output terminal
has been connected properly to the corresponding devices and load.
The transmitter output must pass RF power attenuator before
being connected to the standard signal source/ frequency deviator/
frequency spectrum.
When testing the receiver, make sure not to conduct
transmitting operation.
When in debugging/testing/service, make sure static free
measures for human body and equipments.
6.1 Service Equipment and Software.
The following equipments and software in Table 6.1 are
necessary for the service and test of the radio.
Table 6.1 For Test and Service Equipment and Software
6.2 Debugging Items
During the course of maintenance, the radio needs to be tested
and debugged after replacing components. Some certain radio
parameters can be modified (computer mode) with our KSP 20
programming software. The modifiable parameters are as follows:
1) Frequency difference
2) TX power
3) Low battery power warning threshold
4) Squelch level
5) CTCSS frequency deviation
6) DCS frequency deviation
Debugging Procedures
a.Enter the computer test mode. Access method refers to the
instruction in 4.2 parameter setting.
b.Select the Test Mode option to enter the computer test
mode.
c.Select the options that you want to adjust and adjust the
parameters on the computer.
d.After adjustment, exit the computer test mode.
6.3 Debugging
6.3.1 VCO Modification
Turn off the power saving mode. Set the frequency at the low
frequency (see Table 6.2). In receiving status, test the PD power
with the digital multimeter. Adjust the trimming capacitor C180 to
make the PD power at 1V 0.1V.
Set the TX frequency at high frequency (see Table 6.2), press
the PTT button, test the PD power with the digital multimeter. The
power should lower than 3.5V.
The equipments in item 6, 7, 8, 10, 11, and 12 can be replaced by a
comprehensive test instrument.
Figure 6.1 External Speaker/Mic Connector Defi ni ti on
Table 6.2 Radio H/I/L Frequency
Low Frequency Medium Frequency High Frequency
PT4200(1) 420.125MHz445.125MHz 469.975MHz
PT4200(2) 400.125MHz425.125MHz 449.975MHz
6.3.2 PLL Frequency Adjustment
Under the computer test mode, select frequency tune
option and click adjustment to enter. Adjust the TX frequency
among 0~255 to the specified value. (Frequency error should less
than 200Hz.)
6.3.3 TX Frequency Adjustment
Under the computer test mode, select high power, low
frequency and click adjustment to enter. Adjust the TX power
among 0~255 to 4W. And watch the working current and make sure
it not higher than 1.5A.
Adjust high power, medium frequency , high power, high
frequency to set the TX power at 4W.
6.3.4 TX Low Power Warning
Adjust the power to 6.8V.
Under the computer test mode, select the low power
threshold , and click adjustment to enter. Adjust the figure
among 0~255 to make the red light flash.
6.3.5 Frequency Deviation Adjustment
Input 100mV, 1000Hz audio signals from the radio MIC, and
adjust the potentiometer VR2 to set the TX frequency deviation at
2.2kHz.
11
Page 14
PT4200 SERVICE MANUAL
6.3.6 DCS TX Signal Wave Shape and Frequency
Adjustment
Under the computer test mode, selectDCS wide band
modulationand clickadjustmentto enterAdjust the
potentiometer VR1, and watch the demodulation signals. The wave
shape should be smooth (close to square wave) and then adjust the
figure to set the frequency deviation at 0.35kHz.
6.3.7 CTCSS Frequency Deviation Adjustment
Under the computer test mode, selectCTCSS wide band
modulation , and click adjustment to enter. Adjust the figure to
set the frequency deviation at 0.35kHz.
6.3.8 Receiver Sensitivity
Repeat adjusting L9, L10, L6, and L5 to make the frequencies
at highest sensitivity.
6.3.9 Receiver Squelch Setting
Under the computer test mode, select the 9th squelch and
click adjustment to enter. Input the receiver with the signals of
1kHz modulation frequency, 3kHz frequency deviation, and 117dBm level. Adjust the figure to make the green light flash.
Under the computer test mode, select the 1st squelch and
click adjustment to enter. Input the receiver with the signals of
1kHz modulation frequency, 3kHz frequency deviation, and 124dBm
level. Adjust the figure to make the green light flash.
6.4 Debugging
The above debugging refers to Table3, Table4, and Table 5.
Table 6.3 Voltage Controlled Oscillator (VCO)
Item
Sensit
ivity
Squel
ch
Activa
tion
Sensit
ivity
Test
Condition
CH: MF
CH:LF
CH: HF
RF OUT:
-116dBm
(0.35 V)
MOD:1kHz
DEV:
1.5kHz
(W/N)
Ch: RX
Center
Frequency
9th
RF OUT:
-117dBm
1st
RF OUT:
-124dBm
Test
Equipment
RF Audio
Signal
Generator
Oscillator
Audio
Voltmeter
Distortion
Test
Device
/Comprehe
nsive Test
Device
Test
Point
Speak
er
Conne
ctor
Adjustment
Part
Computer
Test Mode
Computer
Test Mode
Require
-ment
SINAD
12dB or
higher
Computer
Test Mode
After
adjustmen
t, squelch
activation
is normal.
After
adjustment,
squelch
activation
is normal.
Note
Item
Test
Condition
Setting
Locked
Power
Battery
Power:
7.5V
CH:RX
Frequency
CH:RX
Frequency
CH:TX Low
Frequency
CH:TX High
Frequency
Table 6.4 Receiver
Item
Test
Condition
Band
Pass
Filter
Ch: RX
Audio
center
frequency
RF OUT
Level
-53dBm
(501 V)
MOD:1kHz
DEV: 3.0
(kHz)
Audio
Load:16
Low
High
Test
Equipment
Digital
Multimeter
Test
Equipment
Spectroanalizer/
Compreh
-ensive
Test
Device
RF Audio
Signal
Generator
Oscillator
Audio
Voltmeter
Distortion
Test Device
/Comprehe
nsive Test
Device
Test
Adjustment
Point
PD
C180 1.0V 0.1V
C181 1.0V 0.1V
Test
Adjustment
Point
Before
Computer
Mixing
Test
Speak
er
Conne
ctor
Part
Part
Require
-ment
Lower
than 3.5V
Lower
than 3.5V
Require
-ment
ModePass
Band
25MHz,
smooth
wave
Shape
(Turn the
volume
knob
clockwise)
Audio
power
0.3 W
Note
Adjust
-ment
Watch
Adjust
-ment
Watch
Note
Not
recommend
user
the
to
adjust
it!
Inner
speake
r power
1.2W
Table 6.5 Transmitter
Item
TX
Frequ
ency
DCS
Wave
Shape
(Balan
ce)
Power
Maxim
um
Modul
ation
Frequ
ency
Deviati
on
Modul
ation
Sensiti
vity
Test
Condition
CH: TX
Center
Frequency
AG:1kHz/
70mV
AG:1kHz/
7mV
Test
Equipment
Frequency
Meter/
Comprehe
nsive Test
Device
Oscillator /
Comprehe
nsive Test
Device
Power
Meter/
Comprehe
nsive Test
Device/
Ammeter
Frequency
Deviation
Meter/
Comprehe
nsive Test
Device
Test
Point
Anten
na
Adjustment
Part
Computer
Test Mode
Vr1
Computer
Test Mode
Require
-ment
Within
±
200Hz
Wave
shape is
close to
smooth
square
wave.
Adjust to
4W
Adjust to
±
4.5kHz
Checking
frequency
deviation:
2.2kHz~
3.6kHz
Note
Within
±
200H
z
±
200
Hz
12
Page 15
PT4200 SERVICE MANUAL
Item
CTCSS
DEV
DCS
DEV
Battery
Power
Warnin
g
Test
Condition
CTCSS:
67Hz
DCS
023N
Battery
Terminal:
6.8V
Test
Equipment
Frequenc
y
Deviation
Meter/
Compreh
ensive
Test
Device
Test
Point
Anten
na
Adjustment
Part
Computer
Test Mode
Require
-ment
Adjust
±
to 0.75kHz
Adjust
±
to 0.35kHz
After
adjustment,
the indicator
flashes.
Note
±
±
50Hz
50Hz
Chapter 7 Major Specifications
7.1 General Specification
Model PT4200
Frequency (1)420~470MHz (2)400~450MHz
Modulation 11K F3E
Number of Channels16(15+S)
Channel Spacing 12.5 kHz
MF 1st MF 49.95 MHz 2nd MF 450kHz
Working Voltage 7.5V
Working Temperature -25 ~ +55
Antenna Impetance50
Mic Impedance 2k
Battery (Standard)Model KB-58A Li-Ion Battery DC 7.2V ,
1000mAh
Dimension (WXHXD) 56 mmx120 mmx29 mm
Weight 235 With battery and Antenna
7.2 Receiver
Available Sensitivity
(12dBSINAD)
Squelch Activation
Sensitivity
Receiver Surplus
Output
Modulation Receiving
Bandwidth
Adjacent Channel
Selectivity
Intermediation
Reject Ratio
Spurious Response
Reject Ratio
Audio Output
Power
Receiving Current
Sinking
Standby Current
(Average)
0.35 V
0.20 V @level 3 squelch
-40dB
3.5kHz
60dB
60dB
70dB
500mW @distortion 5% 4
250mA
25mA
RF Power
Frequency Stability
Maximum Modulation
Frequency Deviation
Modulation Sensitivity
Modulation
300~3000Hz
Adjacent Channel
RF Power
Spurious and
Harmonics
Residential Frequency
Modulation
Transmitting Current
Sinking
Chapter 8 Trouble Shooting
No
.
PROBLEM
No
display
after
1
switching
on the
radio.
PLL is
unlocked.
(Beep
2
sounds)
Cannot
talk to or
hear
3
other
group
members.
4
Cannot
receive
signals.
A. Battery power may be insufficient. Recharge or
change the battery pack.
B. The power switch is broken, and please change it.
C. The CPU is broken, and please change it.
D.The regulator IC12 is broken, and please change
it.
A. The PLL crystal oscillator C4 is broken, and please
change it.
B. The oscillatingtube is broken, and please change it.
C. The oscillatingtube is broken, and please change it.
A. Make sure the two communication radios are
using the channel of the same frequency.
B. Make sure the CTCSS/DCS tone is the same as
that of your group members.
C. Out of the effective communication range.
A. The antenna is not well connected, and please
screw the antenna again until secure.
B. The sensitivity is too low and minitrim L9, L10, L7,
L6, and L5.
C.HF amplifier Q20 is broken, and please change it.
D. The squelch level is too high and the squelch
cannot be activated. Reset the squelch level with a
computer.
E. Mixer tube Q19 is broken, and please change it.
F. MF processing chip IC5 is broken, and please
change it.
4.0W @7.5V DC
2.5kHz
2.5x10
-6
16mV
3%
-60dB
-70 dB
-40 dB
1.8A @ 7.5V DC
SOLUTION
13
Page 16
No
.
PROBLEM
The
indicator
lights red
when in
transmitti
5
ng but no
voice can
be heard.
PT4200 SERVICE MANUAL
SOLUTION
A. The power amplifier tube Q11 is broken and
there is no power output and please change it with
a new tube.
B. The microphone is broken, and please change it
with a new one.
C. The operational amplifier IC3 is broken, and
please change it with a new one.
The
indicator
lights
green
when in
6
receiving
but no
voice can
be heard.
Cannot
program
the radio
7
parameter
s
normally.
A. The speaker is broken, and please change it
with a new one.
B. The audio amplifier IC8 is broken and please
change it with a new one.
C. The switch tube Q36 and Q35 is broken, and
pleas change it with a new one.
D. The operational amplifier IC6 is broken, and
please change it with a new one.
A. Make sure the programming cable is well
connected.
B. The computer RS-232 serial port output is
unmoral, and please fix the computer.
C. The MIC is not well connected with the SPK
socket. Check the socket and if it is unable to work
normally please change it with a new one.
Chapter 9 KBC-58L Charger
9.1 Charger Specifications
A) Idling Input Current: 30mA
B) Charging Terminal Maximum Idling Voltage: 8.8V
C) Constant current charging: 200 270mA
D) Maximum Charging Time: 7 hours
E) Maximum Charging Voltage Limit: 8.45 0.1V
9.2 Charging and Charging Indicator
A) When DC inputs power voltage 14~20V, the indicator lights
yellow.
B) When the battery is inserted into the charger, the red and
yellow indicator lights. (The battery power is lower than 8.1 0.1 V. )
(When the voltage is lower than 6.0V, the red indicator become light
slowly after about 20 seconds.)
C) When the battery voltage is lower than 8.10.1 V, the
charger charge the battery with constant current. (Charging current
is 200 270mA. It needs 3~4 hours to charge a battery that has
been discharged completely.)
D) When the battery voltage is higher than 8.1 0.1 V, the
charging current will decrease gradually; when the battery voltage is
8.28.4V, the charging current will decrease quickly; when the
battery voltage is 8.4 8.5V, the charging current will close to zero
(then the charger begins constant voltage output) and charging
stops. This course takes about 2~3 hours.
E) When the battery voltage is 8.2 8.4V, the red, yellow and
green indicator lights. When the battery voltage is 8.3 8.5V, the
red indicator becomes dime and the green and yellow indicator light.
LED red: Charging indication
LED yellow: Power indication
LED green: Charging completion
Note: After putting the battery pack that has been discharged
completely into the charger, its red indicator needs about 1~2
minutes to turn light.
Appendix 1 Abbreviations
AMP amplify, amplifier
ANT antenna
APC automatic power control
BPF band pass filter
CTCSS continuous tone control squelch system
DCS digital code squelch
DEMOD demodulation
2
E PROM electrically erasable programmable read-only memory
HPF high pass filter
IDC instantaneous deviation control
IF intermediate frequency
LED Light-Emitting Diode
LNA low noise amplifier
LPF low pass filter
MCU micro control unit
MIC microphone
MOD modulation
MONI monitor
PLL phase lock loop
PTT push-to-talk
RX receiver
SPK speaker
TCXO temperature compensated crystal oscillators
TX transmitter
UL un-lock
VCO voltage control oscillator
14
Page 17
Appendix 2 Spare List
No.
Material Serial No.
201-000558-002
1
201-000558-003
2
201-000558-005
3
201-000558-006
4
202-000558-001
5
203-000558-001
6
203-000558-002
7
203-000558-005
8
203-003208-002
9
203-003208-004
10
301-20040G-001
11
301-20080G-001
12
301-25060J-001
13
302-17040G-001
14
102-MC3361-R01
15
103-L190YG-R01
16
103-MHC190-R02
17
104-MT717T-001
18
104-TA1298-R01
19
105-RD01MU-R01
20
105-RD07MV-R01
21
106-RD835E-001
22
108-455C24-R01
23
108-CF450H-R01
24
108-XF4995-R01
25
110-110473-R01
26
110-110683-R01
27
110-220103-008
28
121-200000-001
29
122-113M00-001
30
122-17M300-R01
31
122-249M50-001
32
124-050000-005
33
124-050000-R04
34
603-0W558A-001
35
PT4200 SERVICE MANUAL
Name/Specification
PT558 volume knob / PC+ABS,black
PT558 encoder knob / PC+ABS,blak
PT558 upper cover / PC+ABS,black
PT558 latch / PC+ABS,black
PT558 Earpiece-Mic jack panel cover / black silica gel(enhanced elasticity)hardness70
PT558 antenna nut£¬brass£¬black passivation
PT558 witch nut£¬brass£¬black passivation
PT558 latch spring, carbon spring steel wire¡Ó0.35£¬nickle plating