Kenwood NX-800 Service Manual page 82

U
NX-800
TX-RX UNIT (X57-7390-10)
R126
39
R116 R121 R127
TX
0 0 39
PM DRAIN BIAS
PROTECTION
+B
80T
R132
100k
AUTO
POEWR CONTROL
IC101
NJM2904V-ZB
1
V+
2
3
4
GND
C134
470p
R117
10k
2
R277 R279 C281
RX
0 0 470p
150C R282
0
2
1
X57-739 5/16
V
SCHEMATIC DIAGRAM
IC102
RA30H4452M123
ANTENNA
SWITCH
D103
L407CDB
C136
470p
R : 0V
FC-H : 3.77V
T : 1.59V
FC-L : 3.34V
FC-H : 13.01V
FC-L : 13.38V
ANTENNA
SWITCH
R142
100k
AUTO
POEWR CONTROL
IC103
NJM2904V-ZB
8 1
7
2
R136
R134 100k
6 3
5 270k 4
GND
SW
(RF PWER H/L)
C158
Q105 470p
DTC114EE
SW
(RF PWER H/L)
R140
100k
D207-210
VARI-CAP TUNE
C286 C291 C296
7p 7p 7p
FL : 1.60V
FC : 3.69V
FH : 5.64V
IC205
LMC7101BIM5
1 OUTPUT 5
14.33V
V-
2
V+
3 4
INPUT+ INPUT-
BUFFER AMP
(BPF TUNE)
W
L112
1.5T
C186
120p
POWER POWER
DET DET
R : 0V
T : 0.78V
8
V+
7
6
R147
5
100k
Q106
2SK1830F
2
8.01V
LNA
R294 C301
3.37V
Q210
0 10p
2SC3357-A
2.62V
C315 R313
5p 0
IC206
LMC7101BIM5
1 OUTPUT 5
14.33V
V-
2
V+
3 4
INPUT+ INPUT-
BUFFER AMP
(BPF TUNE)
2
1
X Y
L113 L114
ANT
1.5T 1.5T
R152
0
POWER
DET
FC-H : 2.32V
FC-L : 0.81V
TH2
2
ANTENNA
SWITCH
C310 C335 C319
33p 12p 2p
R317
0
D212,213
R303
VARI-CAP TUNE
100k
FL : 3.70V
FC : 6.16V
FH : 9.21V
2
2
1