Kenwood TK-7180 Service Manual page 75

Z
TX-RX UNIT (X57-6982-71) (B/3)
5C
C343 R337
10k
10u10
MODULATION
CONTROL
FOR TX VCO
D310
BB664
L309 D311
C347
R334
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
0 2.7u 50n
68p
11CL BB664
CV
D307,309,312,313
FREQUENCY
RIPPLE
CONTROL FOR
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
1000p
R175
L173
L39-1421-05
C176
R126
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
15p
C357
Q306
2SK508NV(K52)
C365
1p
TX/RX
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
L174
L39-1421-05
L175
R176
47
2.2k
4.35V
L176
IC171
L39-1421-05
SPM5001
C185 L177
6 1
G2 G1 270n
0.01u
5 2
D1
S1
3
4
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
VCO SW
R:4.88V
Q310
Q308
T:0V
DTC114EE
R347
4.7k
4.40V
R258
22
0.84V
XF171
R178 C187 L71-0618-05 C190 L180 C192
0 68n
39p
39p 0.01u
AC
TK-7180/7189
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 100n C199 L71-0618-05
0.01u C197
0.01u
39p
0.07V
Q171
2SC5108(Y)
IF AMP
AD
D316
HVC131
D315,316
TX/RX
BAND SW
7.81V
8T
AM1
L185
C204
C202
68n
39p
0.01u
MI2
AFO
ME
71
X57-698 6/9