Kenwood TK-8180 Service Manual Supplement page 47

Z
TX-RX UNIT (X57-6990-XX) (B/3)
5C
C343 R337
10k
10u10
MODULATION
CONTROL
FOR TX VCO
D308,311
FREQUENCY
CONTROL FOR
TX/RX VCO
L309 D311
R334 * C347
1u
0 BB664
R315
CV
1k
R336
CV
1k
L310 D313 * L314
R335 * C346
1u
0
11CL BB664
D309,313
FREQUENCY
CV
CONTROL FOR
TX/RX VCO
RIPPLE
FILTER
Q251
2SC4617(S)
R252
4.7k
C252
470p
AM1
* L171 L172 R172
*
18
L173
L39-1421-05
R126 C176
0
470p
0.87V
MI2
AFO
ME
AA
SCHEMATIC DIAGRAM
3.93V
L326
*
C358
*
TX/RX VCO
Q307
2SK508NV(K52)
L325 C364
*
0.5p
TX/RX
VCO SW
Q309
2SC4116(GR)
3.69V
1.0u
L315
C357 6p
Q306
2SK508NV(K52)
C365
*
TX/RX VCO
REVERSE
VOLTAGE
PROTECTION
R254
R255
D251
1SS388
0 0
IC251
MAX5026EUT+T
1 6
PGND LX
2 5
GND
VCC
3 4
FB
SHDN
DC-DC CONVERTER
L174
C178
L39-1421-05
C181
470p
470p
L175 R176
4.97V
R175 47
4.35V
2.2k
L176
IC171
L39-1421-05
SPM5001
L177
C185
1
6
G1 270n
G2 0.01u
5 2
D1
S1
4 3
S2
D2
RX 1ST MIXER
AB
RIPPLE FILTER
Q312
3.94V
2SC4617(S)
R339
100k
3.86V
R340
100
C594
* R375
470p
* C372
VCO
BUFFER
AMP
Q311
2SC5108(Y)
C299
0.5p
0.39V
R353
4.7k
R:0V
* R344 R348
T:2.3V
10k
* R345
TX/RX
TX/RX
VCO SW
VCO SW
R:4.88V
Q310
Q308
T:0V
DTC114EE
2SC4116(GR)
R347
4.7k
4.50V
R258
22
0.84V
XF171
R178 C190 L180 C192
C187 L71-0618-05
68n
0 39p
39p 0.01u
AC
TK-8180
4.99V
4.3V
* L328
* C379 C381
470p
VCO BUFFER
AMP
Q313
2SC5108(Y)
1.02V
* C375
4.96V
R182
3.3k
4.41V
C193
R181
XF171
L182
100n
330 C197 C199 L71-0618-05
0.01u
0.01u
39p
0.07V
Q171
2SC5108(Y)
IF AMP
AD
T:2.84V
R:2.13V
D316
HVC131
D315,316
TX/RX
BAND SW
T:0V
R:2.83V
T:3.55V
R:0V
8T
AM1
L185 C204
C202
68n
39p 0.01u
MI2
AFO
ME
43
X57-699 6/9