Kenwood UBZ-LJ8 Service Manual page 31

P
TX-RX UNIT : RF SECTION (X57-6672-70) (B/2)
RF AMPLIFIER
R96
TX:0.819V TX:0.819V
2.2k
L37
C50 C150
R95
6.8n
470p
10 5p
Q14
2SC5108(Y)
3T
B
RX:2.863V RX:2.863V
XF1
21.7MHz
L41
R71
150n
470
RX:2.87V RX:2.87V
R67
2.2k
3R
IC1 :TB31202FN Q1
IC2 :TA31136FN Q2
Q3
Q4-6,14
Q7
Q
SCHEMATIC DIAGRAM
Note : The components marked with a dot (
TX:1.118V TX:1.118V TX:2.491V TX:2.491V
RF AMPLIFIER
C58
TX:0.62V TX:0.62V
Q7
2SC5092
10p
C52
150p
R44
R43
4.7k
22k
TX:2.47V TX:2.47V
POWER
R99 R100
0
0
RX:1.7V RX:1.7V
IF
RX:1.695V RX:1.695V
C90
Q10
3SK318
100p
1ST MIXER
RX:0.286V RX:0.286V
:DTC114EE Q8 :2SK3656
:2SC5066(O) Q9,10 :3SK318
:2SC4617(S) Q11 :KTC4082
:2SC5108(Y) Q13 :2SC4738(GR)
:2SC5092
R
TX:4.47V TX:4.47V TX:1.636V TX:1.636V
L17
L14
8.2n
6.8n
TX:1.367V TX:1.367V
Q8
2SK3656
RF POWER AMPLIFIER
TX:4.47V TX:4.47V
C64
C67
470p
1u
C88
3p
C87
470p
RX:2.863V RX:2.863V
RF AMPLIFIER
RX:2.869V RX:2.869V
Q9
R56 C94
R57 3SK318
0 5p 0
C144
RX:0.118V RX:0.118V
RX:2.869V RX:2.869V
D1 :HVC131 D10 :HSC277
D2 :1SV270 D11 :RB706F-40
D3 :1SV214
D4,5 :MA2S111
D8 :HVC131
S
UBZ-LJ8
•
) are parts of layer 1.
C80
RX:0.145V RX:0.145V
1p
RF SWITCH TX:0.846V TX:0.846V
D8 L20
C70 C73 L21 L22
15n
12n 15n
470p HVC131
470p
TX:2.465V TX:2.465V
RX:0.096V RX:0.096V
RX:1.165V RX:1.165V TX:0.845V TX:0.845V
L31
L79-1825-05
L29 C101
C102
L32
4T
18n
4.5p 3p
470p
447MHz
RF SWITCH
T
1
ANT
2
3
4
5
6
7
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X57-667 4/4