Wouxun KG-UV920R Service Manual

Twin Band Mobile Radio Service Manual
1
4V
TXCO-U 138-CLK
AFi-U
TX-U 138-DATA
DEV-U
138-Rdata 138-CSN-U
U512
6.144MHz
CMX138
MOD-U MIC
D
1/2V
U523 U522
DQT-U SQL-U
AMP AMP
5V
5R-U
U522
DTMF-STD-U
Q4 AMP DEV-U
Q3 U518
Q2 MT8870
3.58MHz
Q1
DTMF-TOE-U
4V
TXCO-V 138-Rdata
AFi-V
TX-V 138-CLK
DEV-V
6.144MHz 138-DATA
138-CSN-V
U460
CMX138
C
MOD-V MIC
4V
U523 U523
DQT-V
SQL-V
1/2V AMP AMP
5V
1/2V
U523
DTMF-STD-V
Q4 AMP DEV-V
Q3 U519
Q2 MT8870
3.58MHz
Q1
DTMF-TOE-V
5V
CLK DTMF-V
DATA DTMF-U
B U724
APC
HT9200
Multi-AF
M62363FP-LD
M62363FP-CLK
3.58MHz
M62363FP-Data
AFi-U
AFi-V
5V
CLK
SW714
DATA U725 Multi-AF
AFi-V
BUSY VOICE SW-13 SW
SW-8
SW713
FM-AF/DTMF/VOICE Multi-AF
AFi-U
SW-15 SW
SW-11
中 转接口
A
有线复制 接口
写 频接口
1
I Structure of Frequency
This model uses twice frequency conversion. For UHF band, the 1
455KHz; For VHF band, the 1
provided by PLL circuit. PLL circuit is also produced the necessary transmitting frequencies(see Chart
I). A, B, C, D frequency points of Chart I are as followings:
Structure of
Frequency
（1）
136~174.995MHz
（2）
136~174.995MHz
（3）
136~174.995MHz
2
5V
T115
Fin-U
RF
U111
5C-U T132
AMP
15U36
TCX O-U Do-U Ripple
LPF
Filter
5C-U
CR111
19.2MHz
TX/RX-U
DCS-U DC MOD-U BUFF
VCO
SW
AMP
T133 T116
T112
SW-10
38.4MHz 450KHz 450KHz
CF
5R-U
T527
FM IF U512
SQL-U
DEV-U TA31136F
AMP
5V
T118
Fin-U
RF
U114 5C-V T121
AMP
TCX O-V 15U36 Do-U Ripple
LPF
Filter
CR114
19.2MHz
T/RX-U
DCS-V DC BUFF
MOD-V VCO
SW
AMP
T113 5V
T134 T119
SW-1
x2
5R-V
28.8MHz
T114
FM IF U512
ANSQL
DEV-V TA31136F
AMP
T520
450KHz CF 450KHz
5V 5V
T737
P-SPK1
MOD-V SW STANDBY
MOD-U
5V
TUNE-U T738
U460 TUNE-V Filter
SW
CMX138
AFo-U
AFo-V
RXo
RXi
SW714
SW714
RXo SW714
SW MOD-V AFo-V
SW-13 SW
SW-14 SW
SW713
SW713
RXo SW713
SW MOD-U AFo-U
SW-15 SW
SW-16 SW
TXD
RXD
2
st
IF is 29.95MHz, and the 2
A
165.250~204.245MHz
165.250~204.245MHz
165.250~204.245MHz
3
5C-U
5C-U 5R-U 8T-U 8T-U
RF T/R RF RF U/V
AMP SW AMP AMP SW
T117 D121,D142 T139 T140
D330
FL519,FL520
5R-U 5R-U 5R-U
38.85MHz
T539
IF 1st RF
MCF BPF BPF
MIX ER AMP
T537 TUNE
5C-V
5C-V 5R-V 8T-V 8T-V 8T-V
RF T/R RF U/V
BPF BPF
5C-V AMP SW AMP SW
T120 T138 D329
D122,D144
5R-V 5R-V 5R-V
29.25MHz T540
IF 1st RF
MCF BPF BPF
MIX ER AMP
FL521,FL522 T238 TUNE
CLK
STcp
SHcp
Ds
JK713
U781
PHONE
74HC595
JACK
5V
SP714
U742
5V
L4600
BATT
JK714
PHONE
JACK
SP713
控制面板接 口
BATT
BATT
MIC
T736
AFo
MUTE
U730 SW
BATT
TA7368P 8V
CLK
DC DC DATA
T734
SW
SW CS
DC P_SPK2
T732 T735 POWER
SW
3
nd
IF is 450KHz.The 1st local oscillations is
Chart I
C
400~470.995MHz
450~520.995MHz
245~245.995MHz
1
4
D338,D339,D326
D332,T332,T329
BATTo BATT 8T-U 8T-V
D333,D334,T334
RF RF RF U/V
LPF LPF
AMP AMP AMP SW
T325 T326 T331
8T-U 8T-V
U/V
U/V
LPF LPF
SW SW
D527,D528,D327
T327 T328 D331 D335,T333,T330
D336,D337,T335
rectifier rectifier
8V
D342 D340
compare
AMP
APC
IC312
CLK
DATA
5V
RF
AMP
STcp BATTo
8V U812
SHcp 5V
Regulator
SW-1 SW-10
SW-2 SW-11
SW-3 SW-12 8V 5V
U811
SW-4 U781 SW-13
SW-5 SW-14 Regulator
74HC595
SW-6 SW-15
SW-7 5V SW-16
8V
SW-8 RX-V DC 8T-U
TX-U
Q7 SW
T819 T812
8V
5M CPU DC 8T-V
TX-V
5V U752 U912 SW
TEMP
TEMP T820 T811
Voice-CLK ROM -WP
DET
Voice-Data ROM -CLK
Voice-BUSY ROM -Data
BATT 5V
TE M PLL_LE-U 4V
BATT BATT Test U733
BATT Test PLL_LE-V
DET
Regulator
FM-SC LK 595-Ds
FM-Data 595-STcp
138-CSN-U 595-SHcp
U729
5V
WP 138-Data DAC -LD
CLK 138-RData CLK-P LL/DAC
24C64
DATA
138-CLK Data-P LL/DAC
RXD DTM F-STD _U DTMF-TOE _V
BATT
Q4
RX-U Q1
FAN
Q3
TXD DTMF-STD _V
Q2
MCU -CS P-SP K2
DTM F-TOE _U
HT9200-Data M CU -DATA
11.0592MHZ
HT9200-CLK Filter M CU -CLK
FAN P-SP K1 138-CSN-V
4
st
IF is 38.85MHz, and the 2
B
429.25~500.245MHz
479.25~550.245MHz
274.25~275.245MHz
LPF
D
rectifier
D341 T336
5V
C
32.768KHz
FM
T501
RADIO
SW Multi-AF
AF
SW-2
BATT
DC
SW
T818,T825
POWER
5V
DC
5R-U
RX-U
SW
T814 T821
B
5V
DC 5R-V
RX-V
SW
T816 T822
5V
5C-V
RX-V DC
TX-V SW
T817 T823
5V
5C-U
RX-U DC
TX-U SW
T815 T824
JP812
A
FAN
DC
SW
nd
IF is
D