Puxing PX-666 User manual

UHF FM TRANSCEIVER
PX-666
SERVICE MANUAL
------------------CONTENTS--------------------------
INTRODUCTION……………………………………………………2
GENERAL ................................................................................. 2
CIRCUIT DESCRIPTION ........................................................3-8
TECHNICAL SPECIFICATION ............................................. …9
SOFTWARE FUNCTION SPECIFICATION……………………10
SEMICONDUCTOR DATA.............................................……. 11
PARTS LIST...........................................................................12-16
BLOCK DIAGRAM …………………........................................ 17
PCB BOARD………………………………………………………18-19
SCHEMATIC DIAGRAM....................................................... 20-22

INTRODUCTION
SCOPE OF THIS MANUAL
This manual is intended for use by experienced technicians
familiar with similar types of commercial grade communications
equipment. It contains all required service information for the
equipment and is current as of the publication data. Changes
which may occur after publication are covered by either Service
Bulletins or Manual Revisions. These are issued as required.
ORDERING REPLACEMENT PARTS
When ordering replacement parts or equipment information,
the full part identification number should be included. This
applies to all parts : components, kits, or chassis. If the part
number is not known, include the chassis or kit number of which
it is a part, and a sufficient description of the required
component for proper identification.
PERSONNEL SAFETY
The following precautions are recommended for personnel
safety:
DO NOT transmit until all RF connectors are verified secure
and any open connectors are properly terminated.
SHUT OFF and DO NOT operate this equipment near
electrical blasting caps or in an explosive atmosphere.
This equipment should be serviced by a qualified technician only.
SERVICE
This radio is designed for easy servicing. Refer to the
schematic diagrams, printed circuit board views, and alignment
procedures contained within.
GENERAL
Your Transceiver is an electronic product of exact design and should be treated with care .The
suggestions below will help you to fulfill any warranty obligations and to enjoy this product for many
years.
 Do not attempt to open the unit. Non-expert handling of the unit may damage it.
 When using regulated power supply, take notice of power voltage must be between 6V and 8V to
avoid damaging the unit.
 Do not store the Radio under the sunshine or in hot areas.
High temperatures can shorten the life of electronic devices, and warp or melt certain plastics.
 Do not store the Radio in dusty, dirty areas
 Keep the Radio dry. Rainwater or damp will corrode electronic circuits.
 If it appears that the Radio diffuses peculiar smell or smoke, please shut off its power
immediately and take off charger or battery in the Radio, then contact with PUXING agency.
 Do not transmit without antenna.

Technical specification of PX-666
General
Frequency Range 450-470MHz
Working Temperate －20℃―＋50℃
Operating Voltage DC 5.4-6.5V
Operate Mode Simplex or Semi-duplex
Dimension 102mm×55mm×37mm (Not included Antenna)
Weight with battery and antenna 278g
Antenna impedance 50Ω
Transmitter
Frequency Stability ±2.5PPM
Output Power ≥4W
Max Frequency Deviation ≦5KHz
Audio Distortion ≦3%
Modulation type FM
Adjacent Channel Power ≥60dB
Radiated Harmonics: -45dBm
Frequency error +196Hz
Receiver
RF Sensitivity(SINAD) +14.0dBuV/m
Audio Distortion ≦3%
Adjacent Channel Selectivity ≥60dB
Intermodulation Rejection ≥60dB
Spurious radiation -63dBm
Spurious response rejection ≥60dB

PX-666
Software Function Specification
Specification
1. UHF 4W output
UHF: 450-470MHz
2. 16 Channels
3.Wide(25kHz) and Narrow(12.5kHz) selectable
4.Monitor function
5.Power Save function
6.Adjust squelch level(0-9)
7. CTCSS/DCS tone
8.Scan 16th channel
9.Transmitting timer
10.Output power adjustable
11.Reverse frequency simplex
12.CTCSS/DCS selectable
Operation
1．User mode
(1)Normal communicate mode
(2)Manual operation mode
2. It can program the radio by PC software.
(1) programming software
(2) Receiving frequency and transmitting frequency
(3) Receiving tone and transmitting tone
(4) Output power
(5) Time-Out Timer
(6)Squelch level (1-9) selectable
(7)Power save
(8)bandwidth selectable (12.5khz/25khz)
(9)Store channels (16 channels)
(10) Simplex frequency setting
(11) channel step
(12) Scan 16th channel

ITEM
D
ESCRIPTIO
N
I/O FUNCTION
1 EN1 I Encoder input
2 EN2 I Encoder input
3 EN3 I Encoder input
4 EN4 I Encoder input
5CLK ROM I/O CLOCK AND EEPROM
6CLK PLL O CLOCK AND PLL
7CS PLL O CS PLL port
8LD O Unlock Detection
9DATA ROM I/O Data and eeprom
10 MIC MUTE O MIC MUTE CONTROL
11 P-AMP O Audio amplifier power supply control output
12 NC - Non-connect
13 NC - Non-connect
14 NC - Non-connect
15 AVCC - 5M Direct Current output
16 RXO O IF output
17 RXI I IF input
18 NC - Non-connect
19 NC - Non-connect
20 BEEP/QT O BEEP output /CCTCS tone signal output
21 LC O Direct current transfer filter
22 AVSS - Connect to VSS
23 APC O TX:Automatic power/RX: BPT automatic gain output
24 N/W O Width/Narrow control
25 ARX O Receiver audio output control
26 RSSI O Squelch level output control
27 AN SQL O Squelch audio output port
28 BATT Test O Battery check
29 OSC in I Internal oscillator input
30 OSC out I Internal oscillator output
31 VSS - GND
32 Reset I MCU Reset
33 Vdd I MCU 5M power input
34 DQT O DTC control output
35 SAVE O Save function control
36 P-TX O Tamsmit control
37 P-RX O Receiver control
38 TX232 O RS-232C PC output
39 EN1 I Encoder input control
40 MONI O "MONI" key input
41 PTT/RX232 I PTT key /RX232C PC input
42 DATA O PLL data output
43 LED G I LED green
44 LED R I LED red
CPU PIN FUNCTION PX-666

Footprint Comment Quantity MARK
C0402 0.5P(B) 3C212 C211 C323
C306 C149 C201 C205 C151
C154
C0402 1.5P(B) 1C155
C0402 2P(B) 2C209 C200
C0402 3P(B) 5C341 C204 C153 C214 C312
C0402 4P 1C148
C0402 5P(B) 6C324 C404 C321 C150 C218 C307
C0402 6P(B) 4C345 C136 C213 C202
C0402 7P(B) 3C108 VC201 C142
C0402 8P(B) 2VC202 VC301
C0402 10P(B) 2C302 C322
C0402 12P 1C111
C0402 15P 3C203 C403 C217
C0402 18P 1C135
C0402 20P 2C118 C246
C0402 27P 3C904 C905 C249
C0402 47P 1C432
C0402 82P 2C435 C119
C609 C175 C643 C138 C408
C407 C406 C402 C252 C286
C611 C605 C422 C176 C606 C822
C821 C804 C310 C311 C301 C328
C116 C123 C208 C210 C206
C207 C235 C401 C600 C641 C230
C922 C923 C924 C925 C881 C610
C823 C603 C805 C811 C807 C174
C181 C802 C906 C908 C634 C423
C431 C434 C233 C343 C326 C320
C327 C329 C158 C862 C128 C215
C216 C833 R452 C852 C242 C305
C183 C601 C612 C882 C182 C901
C942 C907 C257 C248 C156 C113
C131 C421 C405 C243 C241 C240
C250 C863 C871 C872
C0402 105P 1C941
C0402 221P 4C921 C645 C244 C245
C0402 223P(J) 2C607 C608
C0402 224P 1C256
C0402 273P 1C604
C0402 332P 2C632 C622
C0402 102P
C0402
C0402 104P
C0402 103P
100P
36
22
10
PX-666 PART LIST
Designators
C0402 1P(B) 6
CAPACITOR
23

C0402 333P 1C451
C0402 390P 1C433
C635 C344 C247 C107 C106 C114
C157 C110 C109 C121 C143 C129
C145 C125 C864 C120 C615 C602
C180 C173 C832 C234
C0402 472P 1C254
C0402 473P 3C631 C621 C644
C0402 680P 2C633 C623
C0603 103P 1C831
C0805 20P(G) 1C130
C0805 105P 3C801 C126 C803
C1206 105P 1C127
D_USC 1SV270 3D301 D302 D303
D_ESC HSC277 4D341 D342 D201 D202
D_ESC PMSD4148 2D401 D320
D_SMA 1SR145-400 1D801
D_USC MA77 1D310
D0603 RED 1D822
D0603 GREEN 1D821
D0705 HVU131 1D101
C型 220uF/6.3V 1E643
A型 10uF/10V 6E281 E601 E831 E240 E321 E642
B型 22uF/6.3V 2E404 E832
C0805 0.1uF/16V 2E401 E403
C0805 2.2uF/16V 2E631 E402
C0805 4.7uF/10V 6E602 E180 E422 E443 E603 C304
C1206 1uF/10V 1E641
L0603 2.2nH 1 L119
L0603 1uH 1L431
L0603 15nH 1L102
L0603 18nH 3L208 L101 L341
L0603 100nH 6L601 L301 L322 L323 L321 L302
L0603 100nH 3L621 L401 L103
L0603 220nH 2L901 L903
L0603 560nH 1L2
L0805 100nH 2L105 L107
L0805 220nH 1R655
L0805 220nH 1L109
L1009 1.5uH 1L209
DIODE
ELECTROLYTIC
INDUCTOR
C0402 470P 22

L1009 27nH 1L320
L3325 1uH 1L118
R0402 0R 5R120 R200 R406 R346 R401
R0402 10R 6R825 R644 R640 R341 R320 R115
R0402 22R 2R109 R111
R0402 47R 2R121 R128
R922 R926 R246 R431 R641 R323
R321 R921 R209 R204 R240 R640
R0402 150R 1R642
R0402 180R 1R420
R0402 220R 3R822 R821 R202
R0402 270R 3R343 R154 R139
R0402 330R 3R108 R113 R207
R0402 560R 2R602 R405
R0402 680R 1R110
R0402 820R 1R614
R612 R613 R601 R905 R234 R208
R412 C132
L
104并
R0402 1K2 2R923 R400
R0402 1K5 2R608 R112
R0402 1K8 1R402
R812 R425 R410 R311 R233 R231
R230 C104
R0402 2K7 1R245
R244 R635 R344 R340 R345 R403
R404 R239
R444 R445 R248 R324 R872 R249
R238
R0402 5K6 2R242 R302
R0402 6K8 3R610 R447 R638
R0402 8K2 3R637 R823 R824 R
R184 R911 R883 R624 R925
R924 R927 R310 R432 R811
R301 R347 R634
R0402 12K 2R424 R177
R0402 15K 3R942 R902 R457
R0402 18K 2R604 R187
R605 R423 R451 R305 R411
R125
R0402 30K 1R607
R0402 33K 7R609 R421 R632 R631 R622 R621
R636
R0402 39K 2R941 R422
R186 R182 R312 R107 R118 R871
4K7R0402
82K2R0402
100RR0402
7
12
9
R0402
47K
7
RESISTANCE
R0402 3K3 8
R0402 1K
R0402 10K 13
R0402 22K 6

R126
R0402 51K 1R185
R0402 56K 1R322
R0402 62K 1R117
R0402 68K 1R342
R0402 82K 1R903
R0402 100K 6R603 R904 R881 R306 R303 R201
R173 R171 R170 R174 R175 R172
R882
R0402 120K 1R455
R0402 180K 2R243 R241
R0402 220K 6R181 R286 R433 R203 R232 C251
R0402 680K 1R606
R0402 1M 1R183
R0402 1M8 2R633 R623
R0805 0R 3R123 L801 R127
R1206 0.36R 3R132 R131 R130
TSSOP20 LMX2332ATM 1U401
SOP8 24C08 1U911
SOP8 NJM4558 1U601
SSOP10-P-22
5
TA7368F 1U621
SSOP8 LM2904V 1U170
MIP16 TA31136F 1U240
T_ESM 2SC1623 1T323 LY
T_ESM 2SC4617(S) 2T621 T339
T_ESM DAN222 1D602
T_ESM KRC402E 4T822 T821 T812 T311
T_ESM KRA307E 1T861
T_SOT89 5V 1U831
T_TSM 2SB624 3T901 T871 T811 BV4
T_TSM 2SC3356 1T102
T_TSM 2SK508NV 1T321
T_USM MRF497 1T601 L17
T_USM 1SS372 1D601 BAT54SW
T_USM KRC402E 2T171 T181
T_USM KRA302E 1T240
T_USM 2SC4215 2T230 T431 T34
T_USM KRA307E 1T851
T_USM 2SC5108(Y) 2T101 T341
T_USM 2SC4226 1T322
W3 1T107 POW TR
T_USM 2SK1824 1T641
SOT24 3SK241 2T202 T201 3SK177
R0402 150K(F)
R0402
47K
7
7
DYNATRON
IC

SOT89 2SK3078 1T105
T3X15X040 3T 6L207 L206 L205 L204 L203 L202
T4X15X040 4T 4L110 L112 L113 L114
T8X15X040 6T 2L106 L104
VR1208 10K 1VR451
VR1208 50K 1VR421
CR_DS0305 12.8MHz 1CR421
CR_DS0603 32.768KHz 1CR901
CR_DS6055 38.850MHz 1FL230
ANKEY1 2SW923 SW922 PTT
SW-CH 16CH 1SW921 SW-CH
SW-VR HT10KB 1VR641B SW-VOL
SRP8 1K 2PR922 PR401
SRP8 47K 1PR921
PHONE2.5A 2.5mm 1JK601
PHONE3.5A 3.5mm 1JK621
MIC6.0 MIC 1MIC601 MIC
C28 C28 1CR241
LTUPC455 P50EB 1FL240
QFP44 78P451SAQ 1U901
OTHER
COIL
TUNMER
CRYSTAL

1 2 3 4
A
B
C
D
4321
D
C
B
A
ANT
LPFANTSW
D101
D201
D202
T107T105T102 FAMLAMP
DRIVE AMPAMP
T101
AMP
+5VT +5VT
U170
NJM2904V T181
APC
BATT
PTX
T171
T341
+5VC
MOD
T322T321
VCO
D302
D301
+5VRT311
vccn
D303
12.8MHZ
VR421
PLL U401
LMX2332ATM
U240
RET
TCXO
T201
+5VR
T202
+5VR
38.850MHZ
FL231T230
FM
TA31136F
U601AU601B
+5VT
T621
+5VT
T631
T601
+5VC+5V
PTT/RXD
JK621
PTT
MIC
SP
JK601
VR641
TXD
T812 BATT
T811
U641
TX232
+5V
PTT
MONI
U911
24CO8
ARX
ATX
APC
RXI
RXO TXD
AFC
DQT
BEEP/QT
BATT Test
N/W
FL240CR240
2nd lo
T641
N/W
TXI
+5VT
RSSI
AN SQL
IF
N/W
+5VR
U901
EM44
SW921
+5VT
+5VR
+5VC
SB
POWER +5V
ARX/BEEP
MICMUTE
PAMP
T431
Block diagram

12345
54321
E
D
C
B
A
R301
10K
R305
22K R306
100K
R324
4K7
L301
101T L302
390n
T323
2SC1623
C301
102P D301
1SV270
D302
1SV270
C304
475P
C305
471P
C329
103P
D320
1N4148
TP
R420
180R
C421
104P
C422
102P
R422
22K
R421
33K
T431
2SC4649
R432
RES
R433
RES
R431
RES
C432
CAP
L431
L2
L432
L2
C433
CAP C435
CAP
C434
CAP
C431
CAP
R425
3K3
E422
4.7uF
R424
12K R423
22K
C423
104P
L401
100nH
C401
102P E404
22uF
E403
0.1uF E402 1uF E401 0.1uF
R405
560R R404
560R
R402
2K2
R403
6K8 R401 4K7
C404
5P
C403
5P
1 2 3 4 5 6 7 8 9
10 11
12 13 14 15 16 17 18 19 20
U401
LMX2332ATM
C402
101P
R412
1K
R410
2K2
D401
PMSD4148
R411
150K
C405
NC
C406
101P
C407
101P
C408
101P
R406
0R
PR401
1K
R400
1K2
XOUT 2
VC
4
5C
3
GND 1
CR421
12.8MHz
VR421
50K
23 24 25 26 27 28 29 30 31 32 33
34
35
36
37
38
39
40
41
42
43
44
1 2 3 4 5 6 7 8 9 10 11
12
13
14
15
16
17
18
19
20
22
21
U901
AVcc
RXO
RXI
TXI
TXO
BEEP/QT
LC
AVss
APC
DATA _ROMARX
BATT Test RSSI ANSQL OSC in OSC out Vss
Reset
Vdd EN1
EN2 EN3 EN4
EN1
N/W
LD
PTT/RX232
TX232
P_AMP
DQT
CS_PLL
CLK_PLL
CLK_ROM
LEDR
LEDG
MIC MUTE
KEY_MONITOR
DATA_PLL
P_TX
P_RX
SAVE
T901
2SB624
R904
100K R903 82K
R902
15K
C902
103P
L901
220nH
C901
104P
CR901
32.768K
C904
20P
C905
20P
R286
100K
C286
101P
R923
1K2
R924
10K
R925
47K
C908
104P
A0
1
A2
2
A3
3
GND
4SDA 5
SCL 6
WP 7
VCC 8
U911
24C08
C911
104P
R911
10K
C922
103P C923 103P C924 103P
C925
103P
PR922
1K
PR921
10K
L903
220nH
C907
104P
R927
10K
RSSI
ANSQL
APC
LD
CLK_PLL
DATA_PLL
CS_PLL
CLK_ROM
MICMUTE
BATT Test
DATA_ROM
C906
CAP
3 2 1
SW921A
RD840
6 5 4 9 8 7
12 11 10
21
VR641A
B10K
R640
100R
R941
10K C941
104P
R942
10K
C942
104P
R444
4K7
R445
4K7
R446
RES
R447
2K7
C441
223P
C442
223P
in
Gnd
out
U831
LM2950
C831
103P E831 10uF E832 10uF
C833
103P
C832
471P
R881
150K
R882
150K
R883
10K C881
103P
T821
DTC114EE T822
DTC114EE
D821
GREEN D822
RED
R821
100R R822
220R
R825
10R
R823
8K2
C821
102P
R824
8K2
C822
102P
QT
N/W
EN1
PTT/R X232 TX232 KEY_MO NITOR MIC MUTE P_AMP
KEY_PTT/RX232
TX232
KEY_MONITOR
MICMUTE
P_AMP
RSSI
ANSQL
APC
QT
N/W
DQT
P_TX
P_RX
SAVE
LD CLK_PLL
DATA_PLL CS_PLL
EN2
EN3
EN4
+5VR
+5VR
+5V
+5V
+5V
+5V
+5V
+5V
+B+B
SB
SB
SB