Kenwood TK-80 Service Manual page 101

F
TX-RX UNIT (PLL SECTION) (X57-4660-21)
8A
R822
0
VCO2
L547
83.545-94.544MHz
0.68u
Q533
2SK508NV
(K52)
C681 C685
33p 7p
L548
C713
2p
0V
4.0V
VARI-
CAP
Q532
DTC114EK
SWITCHING
VB2
VB3
8A
Q511 Q512
AMPLIFIER BUFFER AMPLIFIER
TP505
54MHz
7.3V
BPF
3.6V
2.0Vp-p 3.5V
2.9V
Q511
2SC2714(Y)
C535
1.1V
2SC2712(Y)
100p
1.8V
Q516
BUFFER
FIN
AMPLIFIER
2.3V
L529
C592
10u
0.01u
L516
R572
6.3V
100u
100
3.8V
R570
Q514
10k
2SC2712(GR)
3.1V
Q514 R574
BUFFER
1k
AMPLIFIER
L534
R618
6.3V
100u
100
3.8V
R616
Q522
10k
2SC2712(GR)
3.1V
R620
Q522
1k
BUFFER
AMPLIFIER
CHOP
L530
1.2u
RIN
5A
CLK
R632
22k 7.8V
2.4V
X501
Q525
20MHz
2SC2714(Y)
2.0V
C642
5p
Q525
5.0V 5.0V
CRYSTAL
OSC
L540
100u
OPTION
SO-2
Note : The components marked with a dot (
G
R821
0
VCO3
L549
0.68u
94.545-103.045MHz
Q535
2SK508NV
C691 C695 (K52)
20p 5p
L550
R667
4.0V
3.3k
0V
D506
R823
VARI-
CAP
0
Q534
D505
DTC114EK
SWITCHING
SWITCHING
L509 L510 L511
R560 C536 C542 C543
3.3u 1.5u 2.2u
100 0.01 27p 27p
Q512
C539 C541
3p 1.5p
IC504
NJM2594V
MIXER
7.7V 2.9V
5
SIGIN
Q516
C564
6
2SC2712(Y)
BYPASS OUTPUT2
1.7V
0.01u
C707 7
OUTPUT1
CARIN
8
0.01u
470mVp-p NC
L517 L518
22u 22u
7.6V
C560 C562
Q523
10p 22p
2.4V
2SC2712(Y)
1.7V
C624
0.01u
Q523
BUFFER
AMPLIFIER
L535 L536
R621
22u 22u
0
C617 C619
10p 22p
R595
100
7.7V
2.3V
X502
62.35MHz
Q517
R597
1.6V
2SC2714(Y)
47k
CRYSTAL OSC
3.5V
L531
C600 R598
3p 100
8.0V
R635 R682
100 10
Q526
7.5V
2SC2714(Y)
R683 R638 2.7V
7.5V
10 100 R641
3.4V
680 C645
1000p
2.0V
Q526-528
Q527
BUFFER
2SC2996(Y)
AMPLIFIER
•
) are parts of layer 1.
H
SCHEMATIC DIAGRAM
Q507
2SC2714(Y)
2.1V
Q507
3.7V
7.6V
Q536
AMPLIFIER
2SC2714(Y)
C701
1000p
C704
3.0V
1000p
R671
TP502
54MHz
3.3k
Q536
BUFFER
AMPLIFIER
D507
SWITCHING
MIXER
IC503
NJM2594V
70mVp-p
1 8
170mVp-p
VCC NC
2 7
OUTPUT1 CARIN
2.5V
3 6 C545
1.6V
OUTPUT2 BYPASS
0.01u
C549
4 5
GND SIGIN
1000p
170mVp-p
Q515
BUFFER
AMPLIFIER
600mVp-p
4
L524 L525
C570 C572 C574
GND
3
5.6u 8.2u
47p 47p 68p
2
C576 C578
1
33p 10p
VCC
6.7V
IC506
NJM2594V
MIXER
2.9V
5 4
SIGIN GND
C625
6 3
BYPASS OUTPUT2
0.01u
2
7
OUTPUT1
CARIN
8 1
0.58Vp-p
NC VCC
0.51Vp-p
6.5V
L532
100u
R602
7.7V
22k
2.3V
Q518
Q519
BUFFER
2SC2714(Y)
1.6V
AMPLIFIER
C604
7.7V
1000p
Q519
BUFFER
Q518
AMPLIFIER
2SC2714(Y)
2.7V
L541
TP501 100u
1.0Vp-p
7.5V
2.7V
2.7V
R648 C660
R644
180k 0.01u
680 C648 R647
0.01u 270 0.6V
2.0V
Q529
Q528
2SC2712(Y)
2SC2996(Y)
AMPLIFIER
I
TK-80
7.6V
C515 C516 C518 C520 R543
47p 47p 6p 11p 10
1.4V
L506 L507
82n 56n
C554 C553
70mVp-p
0.75p 0.75p
L515 L514 L513
Q513
7.7V
BUFFER
AMPLIFIER
2.3V
C551 R569
Q513 1000p 560
2SC2714(Y)
R579
22k
2.3V
7.7V
C580 R581
Q515
0.01u 22
2SC2712(Y)
1.7V
R584 C586
0 0.01u
720mVp-p
40mVp-p
1.0Vp-p
IC505
UPC1686G
MIXER
2.6V
240mVp-p
L527
100u
R628 1.7Vp-p
100
L539
CF500 7.1V
C630
IN OUT
22p
0.7V
Q524
2SC2714(Y)
AMPLIFIER
TP506
62.35MHz
1.4Vp-p
L542
10u
R607
22k
L543
7.7V 7.9V
4.7u 2.3V
Q520
2SC2714 C609
2.2V
(Y)
1000p
C607
1.6V
1000p
1.5V
Q521
Q520
2SC2714(Y)
BUFFER
AMPLIFIER AMPLIFIER
X57-466 (PLL) 2/2
J
1
CN501
LO1
TX-RX-CN2
3.4dBm
73.145-
103.045MHz
2
3
4
4.6V
4.8V
TP503
5
CN503
1
CAR
TX-RX
2
-CN9
GND
-1.2dBm
10.695MHz
6
CN502
LO2
TX-RX-CN3
+2.5dBm
62.35MHz
L533
0.22u
C611
6p
7
89