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.............................................……. 1 1
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
Working Temperate
Operating Voltage
450-470MHz
－ 20 ℃―＋50℃
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 50 Ω
Transmitter
Frequency Stability
Output Power
Max Frequency Deviation
Audio Distortion
Modulation type
Adjacent Channel Power
Radiated Harmonics:
Frequency error
±2.5PPM
≥4W
≦3%
≥
≦5KHz
FM
-45dBm
+196Hz
60dB
Receiver
RF Sensitivity(SINAD)
Audio Distortion
Adjacent Channel Selectivity
Intermodulation Rejection
Spurious radiation
Spurious response rejection
+14.0dBuV/m
≦3%
≥
≥
≥60
60dB
60dB
-63dBm dB
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 16 th
channel
-
-
O
O
-
-
O
I
I/O
O
O
-
-
I/O
I
I
I
I
I/O
O
O
O
I
O
O
-
I
O
O
O
I
O
I
O
I
I
-
O
O
O
O
O
O
I
I
CPU PIN FUNCTION
PX-666
2
3
31
32
33
34
35
36
37
38
39
40
41
42
43
44
18
19
20
21
22
14
15
16
17
7
8
9
10
4
5
6
11
12
13
27
28
29
30
23
24
25
26
ITEM DESCRIPTION
1 EN1
EN2
EN3
EN4
CLK ROM
CLK PLL
CS PLL
LD
DATA ROM
MIC MUTE
P-AMP
NC
NC
NC
AVCC
RXO
RXI
NC
NC
BEEP/QT
LC
AVSS
APC
N/W
ARX
RSSI
AN SQL
BATT Test
OSC in
OSC out
VSS
Reset
Vdd
DQT
SAVE
P-TX
P-RX
TX232
EN1
MONI
PTT/RX232
DATA
LED G
LED R
Encoder input
Encoder input
Encoder input
Encoder input
CLOCK AND EEPROM
CLOCK AND PLL
CS PLL port
Unlock Detection
FUNCTION
Data and eeprom
MIC MUTE CONTROL
Audio amplifier power supply control output
Non-connect
Non-connect
Non-connect
5M Direct Current output
IF output
IF input
Non-connect
Non-connect
BEEP output /CCTCS tone signal output
Direct current transfer filter
Connect to VSS
TX:Automatic power/RX: BPT automatic gain output
Width/Narrow control
Receiver audio output control
Squelch level output control
Squelch audio output port
Battery check
Internal oscillator input
Internal oscillator output
GND
MCU Reset
MCU 5M power input
DTC control output
Save function control
Tamsmit control
Receiver control
RS-232C PC output
Encoder input control
"MONI" key input
PTT key /RX232C PC input
PLL data output
LED green
LED red
PX-666 PART LIST
Footprint Comment Quantity
C0402
C0402
C0402
C0402
C0402
C0402
C0402
C0402
C0402
C0402
C0402
C0402
C0402
C0402
C0402
C0402
C0402
C0402
C0402
C0402
C0402
C0402
C0402
C0402
C0402
C0402
C0402
C0402
0.5P(B)
1P(B)
1.5P(B)
2P(B)
3P(B)
4P
5P(B)
6P(B)
7P(B)
8P(B)
10P(B)
12P
15P
18P
20P
27P
47P
82P
100P
102P
103P
104P
105P
221P
223P(J)
224P
273P
332P
Designators
1
1
2
1
4
2
3
1
2
2
1
3
1
2
6
4
3
2
1
2
5
1
CAPACITOR
3
6
10
23
36
22
C212 C211 C323
C306 C149 C201 C205 C151
C154
C155
C209
C341 C204
C148
C153
C200
C214
C324 C404 C321 C150 C218 C307
C345 C136 C213 C202
C108 VC201 C142
VC202 VC301
C302 C322
C111
C203 C403 C217
C135
C118 C246
C904 C905 C249
C432
C435 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
C941
C921 C645 C244 C245
C607 C608
C256
C604
C632 C622
MARK
C312
C0402
C0402
C0402
D_USC
D_ESC
D_ESC
D_SMA
D_USC
D0603
D0603
D0705
C0402
C0402
C0402
C0603
C0805
C0805
C1206
C型
A型
B型
C0805
C0805
C0805
C1206
L0603
L0603
L0603
L0603
L0603
L0603
L0603
L0603
L0805
L0805
L0805
L1009
0.1uF/16V
2.2uF/16V
4.7uF/10V
1uF/10V
2.2nH
1uH
15nH
18nH
100nH
100nH
220nH
560nH
100nH
220nH
220nH
1.5
uH
333P
390P
470P
472P
473P
680P
103P
20P(G)
105P
105P
1SV270
HSC277
PMSD4148
1SR145-400
MA77
RED
GREEN
HVU131
220uF/6.3V
10uF/10V
22uF/6.3V
1
1
22
2
1
1
1
3
3
1
C451
C433
C635 C344 C247 C107 C106 C114
C157 C110 C109 C121 C143 C129
C145 C125 C864 C120 C615 C602
C180 C173 C832 C234
C254
C631 C621 C644
C633 C623
C831
C130
C801 C126 C803
C127
2
1
1
3
4
1
1
1
DIODE
D301 D302 D303
D341 D342 D201 D202
D401 D320
D801
D310
D822
D821
D101
ELECTROLYTIC
1
6
2
E643
E281 E601 E831 E240 E321 E642
E404 E832
6
1
2
2
E401 E403
E631 E402
E602 E180 E422 E443 E603 C304
E641
2
1
2
1
1
1
1
3
6
3
1
1
INDUCTOR
L119
L431
L102
L208 L101 L341
L601 L301 L322 L323 L321 L302
L621 L401 L103
L901 L903
L2
L105 L107
R655
L109
L209
L1009
L3325
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
27nH
1uH
4K7
5K6
6K8
8K2
10K
150R
180R
220R
270R
330R
560R
680R
820R
1K
0R
10R
22R
47R
100R
1K2
1K5
1K8
2K2
2K7
3K3
12K
15K
18K
22K
30K
33K
39K
47K
1
1
L320
L118
3
2
1
1
1
1
3
3
RESISTANCE
2
2
1
2
2
5
6
12
9
8
R120 R200 R406 R346 R401
R825 R644 R640 R341 R320 R115
R109 R111
R121 R128
R922 R926 R246 R431 R641 R323
R321 R921 R209 R204 R240 R640
R642
R420
R822 R821 R202
R343 R154 R139
R108 R113 R207
R602 R405
R110
R614
R612 R613 R601 R905 R234 R208
R412 C132 L104并
R923 R400
R608 R112
R402
R812 R425 R410 R311 R233 R231
R230 C104
1
8
7
2
3
2
2
3
3
13
6
R245
R244 R635 R344 R340 R345 R403
R404 R239
R444 R445 R248 R324 R872 R249
R238
R242 R302
R610 R447 R638
R637 R823 R824
R184 R911 R883 R624 R925
R924 R927 R310 R432 R811
R301 R347 R634
R424 R177
R942 R902 R457
R604 R187
R605 R423 R451 R305 R411
1
7
R125
R607
R609 R421 R632 R631 R622 R621
2
R636
R941 R422
R186 R182 R312 R107 R118 R871
7
R
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0402
R0805
R1206
TSSOP20 LMX2332ATM
SOP8 24C08
SOP8 NJM4558
SSOP10-P-225 TA7368F
SSOP8
MIP16
LM2904V
TA31136F
47K
51K
56K
62K
68K
82K
100K
150K(F)
120K
180K
220K
680K
1M
1M8
0R
0.36R
T_ESM
T_ESM
T_ESM
T_ESM
T_ESM
T_SOT89
T_TSM
T_TSM
T_TSM
T_USM
T_USM
T_USM
T_USM
T_USM
T_USM
T_USM
T_USM
T_USM
SOT24
2SC1623
2SC4617(S)
DAN222
KRC402E
KRA307E
5V
2SB624
2SC3356
2SK508NV
MRF497
1SS372
KRC402E
KRA302E
2SC4215
KRA307E
2SC5108(Y)
2SC4226
W3
2SK1824
3SK241
1
1
1
6
1
1
6
1
1
2
1
2
3
3
7
7
IC
U401
U911
U601
U621
U170
U240
R126
R185
R322
R117
R342
R903
R603 R904 R881 R306 R303 R201
R173 R171 R170 R174 R175 R172
R882
R455
R243 R241
R181 R286 R433 R203 R232 C251
R606
R183
R633 R623
R123 L801 R127
R132 R131 R130
1
1
1
1
1
1
2
1
2
1
1
1
2
1
1
1
2
1
4
1
1
2
1
3
1
1
DYNATRON
T323
T621 T339
D602
T822 T821 T812 T311
T861
U831
T901 T871 T811
T102
T321
T601
D601
T171 T181
T240
T230 T431
T851
T101 T341
T322
T107
T641
T202 T201
LY
BV4
L17
BAT54SW
T34
POW TR
3SK177
SOT89
T3X15X040
T4X15X040
T8X15X040
VR1208
VR1208
2SK3078
3T
4T
6T
10K
50K
CR_DS0305 12.8MHz
CR_DS0603 32.768KHz
CR_DS6055 38.850MHz
ANKEY1
SW-CH
SW-VR
SRP8
SRP8
PHONE2.5A
PHONE3.5A
MIC6.0
C28
LTUPC455
QFP44
16CH
HT10KB
1K
47K
2.5mm
3.5mm
MIC
C28
P50EB
78P451SAQ
1 T105
6
4
2
COIL
L207 L206 L205 L204 L203 L202
L110 L112 L113 L114
L106 L104
1
1
TUNMER
VR451
VR421
1
1
1
CRYSTAL
CR421
CR901
FL230
2
1
1
1
2
1
1
1
1
1
1
OTHER
SW923 SW922
SW921
VR641B
PR922 PR401
PR921
JK601
JK621
MIC601
CR241
FL240
U901
PTT
SW-CH
SW-VOL
MIC
D
C
B
A
1 2 3 4
Block diagram
PLL U401
LMX2332ATM
SW921
TX232
+5V
PTT
MONI
U901
EM44
D302
D301
VCO
T321 T322 T341
AMP
T101
AMP
T102
DRIVE AMP
T105
FAML AMP
T107
+5VC
D303
T311
MOD
+5VR
RET
TCXO
12.8MHZ
vccn
VR421
FL240 CR240
T431
2nd lo
RSSI
AN SQL
IF
N/W
+5VR
FM U240
TA31136F
+5VT
T230
+5VT
T171
+5VT
BATT
APC
U170
NJM2904V
FL231
38.850MHZ
T202
+5VR
U601B
T181
T201
P TX
+5VR
U601A
TX I
T631 T621
+5VT
RX O TX D
RX I
APC
AFC
DQT
AT X
ARX
BEEP/QT
N/W
BATT Test
N/W
T641
+5VT
T601
MIC MUTE
U641
U911
24CO8
POWER
+5VT
+5VR
+5VC
+5V
SB
T811
P AMP
T812
ANT SW
D101
D201
D202
LPF
+5V +5VC
PTT/RXD
PTT
BATT
TXD
ANT
JK621
MIC
SP
JK601
VR641
ARX/BEEP
1 2 3 4
D
C
B
A
E
D
C
B
A
1 2 3 4 5
C408
101P
C407
101P
C406
101P
C401
102P
E404
22uF
L401
100nH
SW921A
RD840
D320
1N4148
R324
4K7
T323
2SC1623
3
4
1
2
A0
A2
A3
GND
VCC
WP
SCL
SDA
U911
24C08
8
7
6
5
+B
R911
10K
C911
104P
+5V
R411
150K
PR401
1K
R420
180R
VR421
50K
D401
PMSD4148
R412
1K
C421
104P
C405
NC
3
4
CR421
12.8MHz
5C XOUT
VC GND
2
1
C402
101P
U401
LMX2332ATM
R410
2K2
R421
33K
C423
R424
12K
104P
C422
102P
R422
22K
R425
3K3
E422
4.7uF
R423
22K
R432
RES
C432
CAP
R405
560R
R433
RES
L431
L2
T431
2SC4649
R406
0R
C403
C404
5P
5P
R402
2K2
R404
560R
E403
0.1uF
R431
RES
C431
CAP
C434
CAP
R403
6K8
E402
1uF
+5VR
R400
1K2
R401
4K7
E401
0.1uF
R301
10K
L432
L2
C433
CAP
C435
CAP
DATA_PLL
CS_PLL
CLK_PLL
LD
R925
47K
+5V
MIC MUTE
PR921
10K
PR922
1K
EN1
EN2
EN3
EN4
D821
GREEN
T821
DTC114EE
D822
RED
T822
DTC114EE
R823
8K2
R821
100R
C821
102P
R822
220R
C822
102P
C922
103P
R825
10R
C923
103P
R824
8K2
C924
103P
C925
103P
+5V
R942
10K
C942
104P
R941
10K
C941
104P
VR641A
B10K
SB
R640
100R
C831
103P
E831
10uF
SB
R881
150K
R882
150K
R883
10K
C881
103P
+5V
C832
471P in
U831
LM2950 d out
C833
103P
E832
10uF
C286
101P
R286
100K
C908
104P
L903
220nH
12
13
14
15
16
17
18
19
20
21
22
AVcc
RXO
RXI
TXI
TXO
BEEP/QT
LC
AVss
C907
104P
BATT Test
U901
LED G
LED R
DATA_PLL
PTT/RX232
KEY_MONITOR
EN1
TX232
P_RX
P_TX
SAVE
DQT
40
39
38
37
36
35
34
44
43
42
41
CR901
32.768K
C905
20P
ANSQL
RSSI
QT
N/W
C904
20P
APC
C906
CAP
C901
104P
L901
220nH
R902
15K
C902
103P
T901
2SB624
R904
100K
R903
82K
TP
R927
10K
R924
10K
R445
4K7
QT
+5V
R447
2K7
R923
1K2
R444
4K7
R446
RES
ANSQL
RSSI
P_RX
P_TX
SAVE
N/W
MIC MUTE
APC
P_AMP
TX232
KEY_PTT/RX232
KEY_MONITOR
+B
L301
101T
C301
102P
C329
103P
C441
223P
C442
223P
L302
390n
C304
475P
C305
471P
R305
22K
+5VR
D302
1SV270
D301
1SV270
R306
100K
1 2 3 4 5
6 7 8 9 10
L302
390n
D320
1N4148
R324
4K7
T323
2SC1623
R305
22K
+5VR
D302
1SV270
D301
1SV270
R306
100K
E321
4.7uF
C302
101P
R302
10K
VC301
3-10P
R310
10K
C310
102P
C328
102P
L320
27n
ANSQL
RSSI
R246
100K
R251
R
R247
1K2
E281
10uF
R248
4K7
C327
103P
C307
3P
R303
100K
R311
2K2
T311
DTC114EE
L323
R10
C306
1P
D303
1SV270
C312
2P
C320
103P
T321
2SK508(NV)
C321
5P
C322
5P
L321
390n
R321
100R
C323
0.5P
L322
L2
R322
120K
T322
2SC3356
R312
47K
R320
10R
D310
MA77
C311
102P
R323
100R
C326
103P
C324
5P
C852
103P
+5VC
T851
DTA114YE
R342
56K
C341
3P
L341
18n
C325
NC
R341
10R
R348
RES
C344
470P
T341
2SC3356
C345
6P
R343
270R
+5VC
C343
103P
+5VT
R346
0R
R345
3K3
D341
HSC277
C106
470P
R108
330R
D342
R344
3K3
HSC277
R107
47K
R109
22R
C108
7P
T101
2SC5108
C156
104P
L101
18n
C157
470P
L103
100nH
R113
330R
C110
470P
C107
470P
L102
15nH
R112
1K5
R115
10R
R110
680R
R111
22R
C111
6P
T102
2SC4988
C112
NC
C109
470P
C114
470P
C122
NC
R118
47K
C120
103P
R120
0R
T105
2SK3475
R121
47R
R117
120K
C116
102P
L105
101T
L104
1uH
L119
2.2nH
C118
20P
C121
470P
C872
104P
+5VT
+5VR
+5VC
+5VT
+5V
T871
2SB624
C862
103P
+5VR
T861
DTA114YE
C113
104P
R871
47K
C346
470P
R347
10K
C851
103P
R872
4K7 C871
104P
C861
103P
E180
R234
1K
+5VR
FL242
38.850MHz
FL241
38.850MHz
R238
22K
C257
104P
T251
DTA114EE
R249
15K
R246
3.3K
C248
104P
C252
P
CR240
C28
R245
15K
C249
27P
C250
104P
C251
224P
C235
102P
R233
2K2
R232
220K
C231
103P
R231
560R
C233
5P
C242
5P
FL231
38.850MHz
R209
100R
IF_TESTER
R208
100R
C230
5P
C217
22P
C216
103P L209
2.2uH
T202
3SK299(U72)
C218
5P
C213
1P
C201
6P
T230
2SC4215
C254
102P
C256
104P
R244
3K3
U240
TA31136F
C232
5P
C215
103P
R207
330R
C214
5P
L208
18n
C246
10P
R243
180K
C245
221P
C452
475P
R452
10K
C247
471P
R242
3K9
R453
22K
E443
4.7uF
R455
120K
C451
223P
C244
221P
R241
180K
C243
104P
C242
103P
C241
104P
C240
104P
FL240
450K
R240
100R
E240
10uF
R451
22K
R457
1K2
VR451
50K
R636
4K7
E631
2.2uF
R635
3K3
R637
47K
+5VR
C634
103P
C610
470P
T631
2SC4617(S)
+5VC
+5VT
R634
10K
R633
1M8
R632
33K
C632
332P
C633
680P(J)
C611
470P
T621
2SC4617(S)
R631
33K
C631
473P
R624
10K
R640
100R
R623
1M8
R622
33K
C622
332P
R621
33K
C623
680P(J)
T641
2SK1824
C635
470P
C621
473P
R610
6K8
7
U601B
LM4558
R609
33K
R638
1K8
R639
3K3
C609
100P
5
6
R608
1K5
R607
30K
6 7 8 9 10
10 11 12 13
U601B
LM4558
C129
470P
C126
105P
L105
101T
L107
101T
C132
NC
L104
1uH
C125
470P
C128
103P
C131
104P
L106
8T
R117
120K
C116
102P
C113
104P
L119
2.2nH
C119
102P
R127
0R
T107
2SK3476
C118
20P
R125
47K
C117
NC
R128
47R
C121
470P C123
102P
R126
47K
C115
NC
5
6
C180
471P
R184
10K
7
U170B
LM2904V
E180
4.7uF
R183
1M
T181
DTC114EE
+5VT
R182
47K
R180
NC
C135
1P
R177
10K
C130
20P
C140
NC
C141
NC
U170A
LM2904V
1
C175
101P
R181
220K
R176
NC
R175
150K
R186
47K
3
2
R174
150K
C174
103P
R123
0R
C136
7P
C148
15P
+B
R171
150K
C173
471P
R130
0.33R
R131
0.33R
R172
150K
R173
150K
R187
18K
APC
C172
NC
R170
150K
T171
DTC114EE
C182
104P
C218
5P
C176
102P
C181
103P
R185
39K
+5VR
C202
6P
C209
1P
C213
1P
C201
6P
C212
0.5P
C211
0.5P
C210
102P
R204
100R
L205
S32L
R203
220K
C208
102P
L204
S32L
C205
1P
L208
18n
L207
S32L
VC202
3-10P
L206
S32L
T201
3SK299(U72)
C207
102P
R205
180R
C206
102P
R201
100K
VC201
3-10P
5
6
R608
1K5
R607
30K
C608
223P
C605
102P
1
U601A
LM4558
3
2
+5VC
+5VT
R605
22K
C607
223P C606
102P
R604
18K
C604
273P R603
100K
C602
471P
C603
103P
R602
560R
R606
680K
C601
104P
E601
4.7uF
L601
101T
R601
1K
R132
0.33R
R139
270R
C143
470P
+5VT
C138
100P
R154
270R
JP101
JPANT
L109
220nH
D101
HVU131 C142
3P
D201
HSC277
C144
C145
470P
L201
4T
L112
4T
C149
1P
C147
1P
R200
0R
C200
5P(B)
D202
HSC277
C150
5P
L113
4T
C151
1.5P
C153
3P
L114
3T
C154
1P
C155
1.5P
C204
3P
L203
S32L
C203
15P
L202
S32L
+B
C811
103P
R811
10K
T811
2SB624
L118
1uH
R812
2K2
R813
RES
P_AMP
C812
104P
E641
10uF
3
4
1
2
5
U641
TA7368F nc
Vcc
Pout
PwG nc
Vin
Ripple
PreG
Phase
NF
10
9
8
7
6
C643
100P
R642
150R
C641
220P
E642
10uF
+5VC
R921
TX232
100R
R922
100R
KEY_PTT/RX232
R641
1K
C615
471P
R926
1K
T812
DTC114EE
E643
100uF C645
221P
R644
10R
C644
473P
C921
221P
1
2
3
4
5
1
2
3
4
5
L711
101T
KEY_MONITOR
JK621
2.5mm
JK601
3.5mm
SP
SP
SW922
ANKEY
PTT
SW923
ANKEY
MONI
MIC601
MIC
C609
100P
E602
4.7uF
C612
104P
D601
1SS372
R612
100R
E603
2.2uF
MIC MUTE
R613
1K
D602
DAN222
R614
820R
T601
MRF497
C805
103P
+B
L801
101T
R801
F
D801
1SR145-400
C804
102P
C803
105P
BATT+
BATT-
APC
P_AMP
TX232
KEY_PTT/RX232
KEY_MONITOR
+B
PX2903
SCHEMATIC DIAGRAM
PX2903 Revision E03B
10 11 12 13 14
14
D
C
A
E
B
