Kenwood TK-7180H Service Manual page 98

Z
TX-RX UNIT (X57-6980-XX) (B/3)
5C
C343
R337
10k
10u10
MODULATION
CONTROL
FOR TX VCO
D310
BB664
L309 D311
C347
R334
3.3u BB664
0 68p
D306,308,310,311
CV
FREQUENCY
CONTROL FOR
TX/RX VCO
R336
1k
CV
R375
D312
BB664
1k
L310 D313
R335 C346 L314
22 2.7u 50n
100p
11CL BB664
CV
D307,309,312,313
FREQUENCY
CONTROL FOR RIPPLE
FILTER
TX/RX VCO
Q251
2SC4617(S)
R252
4.7k
C252
1000p
AM1
C172
C174
2.5p 7p
L171 L172
R172
22n
27n
5.6
L173
L39-1421-05
R126 C176
33
1000p
0.87V
MI2
AFO
ME
AA
SCHEMATIC DIAGRAM
4.01V
R339 R340
100
100k
TX/RX VCO
C354
Q307
2SK508NV(K52)
56p
C364
1p
3.44V
C357 15p
Q306
2SK508NV(K52)
C365
1p
TX/RX VCO
VCO SW
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
C181
1000p
1000p
L174
L39-1421-05
R175 L175 R176
2.2k 47
4.35V
L176
IC171
L39-1421-05
SPM5001
C185 L177
6 1
G1 270n
G2
0.01u
2
5
D1
S1
3
4
S2
D2
RX 1ST MIXER
AB
TK-7180H/7182H
RIPPLE FILTER
Q312
3.94V
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
R:4.88V
Q310
Q308
T:0V
DTC114EE
R347
4.7k
4.40V
R258
22
0.84V
XF171
L71-0618-05 C190 L180 C192
R178 C187
68n
0 39p 39p 0.01u
AC
4.98V
4.28V
C379 C381
L320
39n
15p
1000p
VCO BUFFER
AMP
Q313
2SC5108(Y)
1.43V
C375
1000p
4.96V
R182
3.3k
4.41V
C193
R181
XF171
L182
330 C197 C199 L71-0618-05
0.01u
100n 0.01u 39p
0.07V
Q171
2SC5108(Y)
IF AMP
AD
D316
HVC131
D315,316
TX/RX
BAND SW
7.81V
8T
AM1
L185
C202 C204
68n
39p 0.01u
MI2
AFO
ME
91
X57-698 6/10