Kenwood TK-7180 Service Manual page 69

Z
TX-RX UNIT (X57-6980-10) (B/3)
5C
C343 R337
10k
10u10
MODULATION
CONTROL
FOR TX VCO
D310
BB664
L309 D311
R334 C347
3.3u
0 BB664
68p
D306,308,310,311
CV FREQUENCY
CONTROL FOR
TX/RX VCO
R336
1k
CV
R375
D312
BB664
1k
L310
R335 D313 C346
L314
2.7u 50n
0 68p
11CL BB664
CV
D307,309,312,313
FREQUENCY
CONTROL FOR
RIPPLE
TX/RX VCO
FILTER
Q251
2SC4617(S)
R252
4.7k
C252
1000p
AM1
C172 C174
2.5p 7p
L171 L172
R172
27n 22n
5.6
L173
L39-1421-05
R126 C176
33 1000p
0.87V
MI2
AFO
ME
AA
SCHEMATIC DIAGRAM
4.01V
R339
R340
100k 100
TX/RX VCO
C354
Q307
2SK508NV(K52)
56p
C364
1p
3.44V
15p
C357
Q306
2SK508NV(K52) C365
1p
TX/RX VCO
2SC4116(GR)
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
4.97V
C178
1000p C181
1000p
L174
L39-1421-05
L175
R175 R176
47
2.2k
4.35V
L176
IC171
L39-1421-05
SPM5001
C185
6 1
G1
G2 0.01u
5 2
D1
S1
4 3
S2
D2
RX 1ST MIXER
AB
RIPPLE FILTER
3.94V Q312
2SC4617(S)
3.90V
C392
R370
1k 1000p
VCO BUFFER AMP
Q311
2SC5108(Y) C372
R346
15p
100
0.74V
R344 R348
10k
100
TX/RX
VCO SW
Q309
2SC4116(GR)
R:0V
R353
T:2.40V
4.7k
R345
100
TX/RX
TX/RX
VCO SW
VCO SW
R:4.88V
Q310
Q308
T:0V
DTC114EE
R347
4.7k
4.40V
R258
22
0.84V
XF171
L177 R178 C187 C190 L180 C192
L71-0618-05
270n 0 68n
39p
39p 0.01u
AC
TK-7180
4.98V
4.28V
L320
C379 C381
39n
15p
1000p
VCO BUFFER
AMP
Q313
2SC5108(Y)
1.43V
C375
1000p
4.96V
R182
3.3k
4.41V
C193
R181
L182 XF171
100n
330 0.01u C197 C199 L71-0618-05
0.01u
39p
0.07V
Q171
2SC5108(Y)
IF AMP
AD
D316
HVC131
D315,316
TX/RX
BAND SW
7.81V
8T
AM1
C202 L185 C204
68n
39p
0.01u
MI2
AFO
ME
65
X57-698 6/9