1
Twin Band Mobile Radio Service Manual
1 2 3 4
A
B
C
D
4
321
D
C
B
A
U/V
SW
RF
AMP
RF
AMP
RF
AMP
RF
AMP
8T-U BATTo
D338,D339,D326
U512
CMX138
DQT-U
15U36
5V
DCS-U
LPF
TX/RX-U
VCO
Rip ple
Filter
5C-U
RF
AMP
BUFF
AMP
RF
AMP
T/R
SW
5C-U
5C-U
5R-U 8T-U
1st
MIXER
BPF
RF
AMP
BPF
5R-U
TUNE
MCF
IF
AMP
29.25MHz
5R-V
CF 450KHz
FM IF
TA31136F
x2
5V
28.8MHz
5R-V
ANSQL
DEV -V
5M
24C64
VOICE
5V
5V
CLK
DATA
CLK
WP
5V
MOD-U
MUTE
SW
DC
SW
BATT
DC
SW
DC
SW
BATT
P_SPK2
CR111
U111
T115
T133 T116
T132
T117 D121, D14 2 T139 T140
T325 T326
D332,T332,T329
T539
T537
FL521,FL522T520
T736
T734
T735
11.0592MHZ
450KHz
PHONE
JACK
JK713
CPU
U912
U725
U729
T114
SP714
Do-U
Fin-U
5C-U
U/V
SW
BPF
RF
AMP
BPF
RF
AMP
T/R
SW
5C-V 5R-V 8T-V
1st
MIXER
BPF
RF
AMP
BPF
5R-V
TUNE
T120
D122, D144
T138
T540
LPF
5R-V
LPF
T/RX-U
VCO
Rip ple
Filter
5C-V
RF
AMP
BUFF
AMP
5C-V
MOD-V
T118
T134 T119
T121
Do-U
Fin-U
5C-V
T238
U512
4V
RF
AMP
FM
RADIO
5V
DATA
CLK
AF
DATA
BUSY
MCF
IF
AMP
38.85MHz
5R-U
CF
450KHz
FM IF
TA31136F
38.4MHz
5R-U
SQL-U
DEV-U
FL519,FL520
T527
450KHz
U512
15U36
5V
PLL-CLK
PLL-LE-V
CR114
U114
19.2MHz
DC
SW
SW-10
TCXO-U
T112
SW
D330
U/V
RF
AMP
T331
Mult i-AF
SW
T327 T328 D331
U/V
U/V
SW
rec tifi er
D341 T336
compare
AMP
rec tifi er
APC
LPF
LPF
D329
SW-2
IC312
LPF
D342
LPF
BATT 8T-U 8T-V
8T-U 8T-V
D333,D334,T334
8V
D527, D528 ,D32 7
D335,T333, T330
D336,D337,T335
5R-U
DCS-V
19.2MHz
DC
SW
SW-1
TCXO-V
T113
PLL-Data
PLL-CLK
PLL-LE-U
PLL-Data
8T-V8T-V
5V
32.768KHz
SW
T501
TX-U
TXCO -U 13 8-CLK
138-Rdata 138-CSN-U
138-DATA
6.144MHz
AMP
1/2V
U523
MOD-U
SQL-U
AMP
U522
MIC
DEV-U
AFi-U
U518
MT8870
DTMF-TOE-U
Q1
Q4
DTMF-STD-U
Q2
Q3
5V
DEV-UAMP
U522
3.58MHz
5R-U
U460
CMX138
DQT-V
4V
TX-V
TXCO-V
138-CLK
138-Rdata
13 8-CSN-V
138-DATA6.144MHz
AMP
4V
U523
MOD-V
SQL-V
AMP
U523
MIC
DEV-V
AFi-V
U519
MT8870
DTMF-TOE-V
Q1
Q4
DTMF-STD-V
Q2
Q3
5V
DEV-VAMP
U523
3.58MHz
1/2V
1/2V
U460
CMX138
AFi-V
5V
M62363FP-CLK
M62363FP-LD
M62363FP-Data
SW
SW714
MOD-V
MOD-U
SW-8
DTMF-V
MOD-V
APC
AFo-V
AFi-V
TUNE-V
AFo-U
AFi-U
TUNE-U
DTMF-U
AFi-U
SW
SW713
SW-11
RXo
SW
SW714
SW-13
SW
SW713
SW-15
RXo
RXo
RXi
RXD
TXD
中转接口
有线复制接口
写频接口
PHONE
JACK
JK714
SP713
L4600
U742
STANDBYSW
T737
BATT
5V
P-SPK1
SW
T738
5V
Filter
AFo-V
SW
SW714
SW-14
AFo-U
SW
SW713
SW-16
TA73 68P
U730
T732
8V
POWER
CS
控制面板接口
MOD-U
Multi-AF
HT9200
5V
CLK
DATA
U724
Multi-AF
3.58MHz
SW
SW714
SW-13
SW
SW713
SW-15
Multi-AFFM-AF/DTMF/VOICE
DC
SW
POWER
BATTo
T818 ,T8 25
BATT
8V
U812
Regul at or
8V
U811
Regul at or
5V
DC
SW
DC
SW
8T-U
TX-U
TX-V
8T-V
T819 T812
T820 T811
8V
5V
5R-U
DC
SW
DC
SW
5R-V
RX-V
RX-V
5C-V
T816 T822
T817 T823
5V
RX-U
DC
SW
T814 T821
5V
5V
DC
SW
TX-U
5C-U
T815 T824
TX-V
RX-U
DC
SW
FAN
BATT
FAN
JP812
DATA
CLK
BATT
CLK
MIC
AFo 4V
5V
U733
Regul at or
U781
74HC595
5V
SW-1
SW-4
SW-3
SW-2
SW-5
SW-8
SW-7
SW-6
U781
74HC595
5V
SW-10
SW-13
SW-12
SW-11
SW-14
RX-V
SW-16
SW-15
Q7
STcp
Ds
SHcp
STcp
SHcp
5V
BATT
DET
BATT Test
P-S PK1FAN
138-Data
138 - CS N- U
DTMF- TOE_U
138 - CS N- V
FM-SCLK
FM-Dat a
ROM-CLK
Voice-CLK
Filter
CLK- PLL/DAC
Dat a- PLL/DAC138-CLK
PLL _L E- V
PLL _L E- U
DAC- LD
595-STcp
MCU-CS
TXD
TEM
RXD
Voi ce-BUSY
MCU- CL K
MCU- DA T A
Voice-Data
DTMF-S TD_V
Q1
DTMF- STD_U
Q2
Q3
Q4
RX- U
HT92 00 - Da t a
138 - RDa t a
P-SPK2
DTMF-T OE_V
ROM-Data
ROM-WP
HT92 00 - CL K
BATT Test
595-Ds
595-SHcp
TEM P
DET
TEMP
5V
BATT
U752
8V
rec tifi er
D340
I Structure of Frequency
This model uses twice frequency conversion. For UHF band, the 1
st
IF is 38.85MHz, and the 2
nd
IF is
455KHz; For VHF band, the 1
st
IF is 29.95MHz, and the 2
nd
IF is 450KHz.The 1st local oscillations is
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:
Chart I
Structure of
Frequency
A C B D
（1） 136~174.995MHz 165.250~204.245MHz 400~470.995MHz 429.25~500.245MHz
（2） 136~174.995MHz 165.250~204.245MHz 450~520.995MHz 479.25~550.245MHz
（3） 136~174.995MHz 165.250~204.245MHz 245~245.995MHz 274.25~275.245MHz
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