Kenwood NX-800 Service Manual page 81

P
TX-RX UNIT (X57-7390-10)
BUFFER AMP
(RF)
Q10
1.79V 2SC5636
TX C82
33p
1.19V
L36
50C
50R
R339
47
4.34V
R250
C240 R245
RX
0
0.01u 100k
C246
0.01u
Q205
2SC3356(R23)
0.74V
1st
IF AMP
50R R209
10
1.39V
2
1
Q
SCHEMATIC DIAGRAM
R : 2.14V T/R
T : 4.26V SW
D101
C86 R158 R160 R69
7p 0 0 0
HVC131
4.80V
T/R
SW
R : 2.81V
T : 0V
R261
4.7k
4.75V
1.76V
C267
C344
7p
Q208
100p
2SC5636
1.20V
BUFFER AMP
(LOCAL)
XF202
58.05MHz
R320 R256 R257 R321
oUT IN
3 6
0 180 0 0
4.95V
CF203
1.39V
450kHz
C230
0.1u
oUT
BUFFER AMP
(2nd IF DET)
R
R : 0V
T : 4.94V
C101 R103 C104 R106
1000p 5.6 100p 220
Q101
2SC5108(Y)F
0.87V
80T
L213 L214
15n 18n
C272 C275 R273 C280
2p 1p 18 470p
C270
470p
L211
R268
47
4.33V
L210
L39-1498-05
R263 C262
0 0.01u
33A_2
R238
10k
R229 C334
IN
2.2k 0.1u
3.29V
2
1
S
NX-800
RF
PRE-DRIVE AMP
C105 C109
100p 6p
RF DRIVE AMP
Q102
2SC5455-A
1.14V
0.15V 7.60V 0.52V
IC204
SPM5001
L215
1 6
G1 G2 L39-1498-05
C279
2 5
D1 S1
3 4
470p
D2 S2
0.93V
1st
MIXER
IC203
TC75W51FK(F)
5 4
VSS
6 3
2
7
8 1
VDD
BUFFER AMP
(RSSI/VAGC)
T
C118
6p
TX
7.92V
RX
2
1
X57-739 4/16