Kenwood UBZ-LJ8 Service Manual page 30

K
UBZ-LJ8
TX-RX UNIT :RF SECTION (X57-6672-70) (B/2)
SHIELD CASE(VCO)
LV
R3 L1
47 10u
HVC131
RX:2.816V RX:2.816V
TX:0.058V TX:0.058V
CN1
20 19
AFO
B
CRS
B
EP
B
DT
3R
CK
3T
UL
GND
3C
GND
BUSY
GND
T0
GND
MOD
GND
2
1
C33
0.047u
35
L11
28
X57-667 3/4
L
SCHEMATIC DIAGRAM
RX:1.889V RX:1.889V
TX:1.889V TX:1.889V
C4
L3
39n
3.5p (B)
D2
1SV270
VARIABLE
CAPACITANCE
DIODE
R4
D3
1k
VARIABLE
RF SWITCH
CAPACITANCE
SWITCH
D1
R9
100k
R5
47k
Q1
RX:0.121V RX:0.121V
DTC114EE
TX:1.711V TX:1.711V
SWITCH
R30
MAX DEV
10k
R35
C17
22k
3p
R24 R27 R28
1.2k 0 0 L7
12n
R26
3.3k
C40
0.33u
35
C35
2.2u
6.3
TB31202FN
1
FIN1
R25
2
VCC1
10
3
CP1
4
GND1
0
5
R31
LD
6
C36 100p R32 100
CK
7
C37 100p R33 100
DATA
8
C38 100p R34 100
STB
DIODE
R80
X1
L77-1930-05
TCXO
21.25MHz
L12
4.7u
2.735V 2.735V
OUTPUT GND
+DC VC
R37
12k
VR3
68k
TX-FREQ
M
RX:0.835V RX:0.835V
TX:0.861V TX:0.861V
C12 9p
RX:0.765V RX:0.765V
TX:0.765V TX:0.765V
OSCILLATOR
Q2
C15
2SC5066(O)
RX:1.508V RX:1.508V 0.5p
TX:1.513V TX:1.513V
RX:2.826V RX:2.826V
L5
TX:2.826V TX:2.826V
3C
R13
RX:2.731V RX:2.731V
TX:2.732V TX:2.732V
10k
D4
SPEED UP
RECTIFIER
D11
RX:1.17V RX:1.17V
RB706F-40
C122
0.047u
C20
3p
L8
RX:0.057V RX:0.057V
12n
PLL IC
IC1
RX:2.485V RX:2.485V
C134
16
1800p
FIN2
15
VCC2
14
CP2
13
GND2
C133
12
SW
11
470p
XIN
10
XOUT
9
BO
RX:0.929V RX:0.929V
R81
0 0
1.533V 1.533V
R75
R74
0
0
N
RX:1.794V RX:1.794V
TX:1.798V TX:1.798V
R16 68k
RX:0.774V RX:0.774V
TX:0.787V TX:0.787V
Q4
2SC5108(Y)
C26
8p
Q6
2SC5108(Y)
BUFFER
RF AMPLIFIER
RIPPLE FILTER
Q3 3C
RX:2.056V RX:2.056V
2SC4617(S)
TX:2.059V TX:2.059V
C25
470p
R19
100k
RX:2.248V RX:2.248V
TX:2.246V TX:2.246V
C27
2p
Q5
RX:0.755V RX:0.755V
2SC5108(Y)
TX:0.752V TX:0.752V
BUFFER
3T
B
3C
3R
R83
270k RX:0.642V RX:0.642V
C129
1000p
Q13
2SC4738(GR)
NOISE AMPLIFIER
2nd IF
450kHz
CF1
RX:1.591V RX:1.591V
R91
10
RX:1.926V RX:1.926V
IF AMPLIFIER
RX:2.809V RX:2.809V
C116
FM IC
IC2 0.01u
TA31136FN
L36
QUAD
COIL
R78
3R
0
O
RX:1.798V RX:1.798V
TX:1.815V TX:1.815V
C28
3p
L10
27n
RX:1.847V RX:1.847V
TX:1.85V TX:1.85V
Q11
RX:0.715V RX:0.715V
KTC4082
R69
820
RX:2.809V RX:2.809V
3R