Kenwood TKR-851 Service Manual page 85

A
TKR-851
TX-RX UNIT (X57-6962-70) (A/2)
1
A2 SUB UNIT (TX VCO/PLL) (X58-4810-10)
TX-CV
(TP102)
2
GND 1
STT 2
STT
8CL 3
8CLT
CV 4
9CL 5
9CLT
MO 6
C223
100p
C233
0.01u
3
4
5
6
7
74
X57-696 (A/2) 1/4
B
SCHEMATIC DIAGRAM
D350
FREQUENCY
D354
CONTROL
MODULATION
L352
R351
1u
CN350 0
1 GND
2 STT
3 8CL
L353 D352 C356
4 CV R353
1u
0
5 9CL 1SV282 8p
FREQUENCY
6 MO CONTROL
C320 C318
L307
R316
1.5k
2.2u10
2.2u10
ACTIVE
FILTER
R312
Q300
2SC4116(GR)
330
R311
10k
ACTIVE R310
FILTER
R320
3.3k
Q301
2SC4116(GR)
3.3k
L301
15n
BUFFER AMP
IC1
NJM4558E
1 8
AOUT
+V
7
2
A-IN BOUT
6
3
A+IN B-IN
4 5
-V B+IN
C179 0.01u
C
R368
33
U-TXVCO
C368
7p
Q350
VCO OSC
Q350
2SK508NV(K52)
L356 C374 R359
L34-4645-05
0.5p
PLL
IC300
SA7025DK
10
11
PHA AUXIN
12 9
VSSA RA
13 8
PHI REFIN
R309
14 7
220
PHP VCCP
6
R306 L306 15
VDDA RFIN
22
5
16
RN RFIN
4
17
RF VSS
L305 18 3
LOCK STROBE
19 2
TEST DATA
L300 L304 20 1
VDD CLOCK
Q302
L302 C321 2SC4226(R24)
15n
4p
BUFFER
AMP
X3
16.8MHz
1 4
VC +VDC
2 3
GND OUT
D
Note : The components marked with
a dot ( • ) are parts of layer 1.
BUFFER
CN351
AMP
GND 2 8 GND
Q355
C379
2SC4226(R24)
VO 1 7 VO
4p
47
C306
0.01u
R305 C305
CN300
0
1000p FIN 1 9
10
C304 5C 2
1000p
LDT 3 11
EPT 4 12
R304 100
DP 5 13
R303 100
CP 6 14
R302 100
REF 7 15
R301 100
R300 10
R319 33
C325 4p
L31
C89
10u
0.01u
E
VO
-6.0dBm
FIN
5C C234
0.01u
LDT
EPT
DP
CP
REF
MB
MO