Kenwood TK-2170 Service Manual Supplement page 37

AE
TK-2170
TX-RX UNIT (X57-700X-XX) (A/4)
R923
B
0
F901
F53-0324-05
L901
BATT
2.5A
VOLTAGE
LIMITER
BATT
CN901
E40-6456-05
1
GND
C926 1000p
2
RX
1000p
C925
3
TX
C924 1000p
4
MOD
5
TCXO
6
5MS
7
UL
8
PCLK
9
PDAT
10
PLE
11
THM
C916 1000p
12
BPF
13
ASQL
14
RSSI
15
DETAF
16
WIDE
17
NARROW
18
5R
19
5C
20
5C
21
5T
22
5T
23
APCSW
C906 1000p
24
DSW
25
PC
26
GND
34
X57-700 (A/4) 1/2
AF
SCHEMATIC DIAGRAM
C576
15p
R913 470
R912 100
R903 470
R902 470
R901 470
4.9V
R506
150k
C516
1u
C517
0.01u
10 16
DGND DVDD
17
9
PLL SYSTEM
DGND DVDD
8 18
IC501
REFin
VP
ADF4111BCP7
7 19
AVDD Rset
R503 6 20
AVDD CP
10
L501
R507
4.7u
47
C515
1000p
AG
RF AMP
(COMMON)
Q507 C579
2.1V
2SC5488
R537 C581
10p
0
1000p
1.4V
RX
LOCAL
SW
XF701
L71-0617-25
49.95MHz
C728 R727 R728 C732
680
0.01u 150 0.01u
L502
C522 C533
10n
470p 5p
C529
2p
D502
C530
8p(B) HSC277
D502,503,512
F-IN FILTER
SHIFT SW
FAST CV
LOCK UP
D504-507
DIODE
D501 FREQUENCY
CONTROL
HSC277 TX VCO
1SV325F
L503
L505
R511 R512 R515 R516
10u
0 0 1k 470
1SV325F
D508-511
1SV325F
FREQUENCY
L506
CONTROL
18u
RX VCO
1SV325F
AH AI
PRE-DRIVE AMP
Q602
TX RF SW 2SK3077F
D516 C601 R602 C611
1000p 0 47p
HSC277
T:0.9V(Hi)
0.75V(Lo)
R:0V
T:2.5V(Hi)
2.1V(Lo)
R:0V
T:5V
R:0V
L708
L706
56n 56n
C738 C741
2p(B) 3p(B)
L707
T:0V
270n BPF C744
R:4.8V
R731 1p
MIXER
2.2k
Q704
T:0V
T:0V
C739
3SK294(F) C746
R:1V
R:3.2V
1000p
12p
R523
22
C538 C550
5p
470p
4.9V 0.9V
Q501
2SC5488
F-IN
DOUBLER
T:5V
R:0V
D513
D506
TX VCO TX VCO
MODULATOR OSCILLATOR
Q502
D507
C541
2SK508NV(K52)
56p
C542 R522 R525
270k
1u 180k
D510
RX VCO
OSCILLATOR
Q503
D511
C548
2SK508NV(K52)
30p
APC
5T
B
DSW
APCSW
PC
5R
T:0V
R:3.2V
BPF
WIDE
NARROW
RSSI
ASQL
5R
5C
C575
4p
R531
22
C566
0.5p(B)
R532
22
C567
0.5p(B)
RX
TX
2nd_Lo