Kenwood TK-2102G Service Manual page 31

F
TX-RX UNIT(X57-6020-10)
D1,2
FREQ.
CONTROL
L6
6.8u
D3,4
MOD
FREQ.
CONTROL
L15
6.8u
5C
2nd Local
RX
PABC
5R
5T
T:0V
R:4.9V
B
C312
0.01u(J)
R340
120k(D)
Q300
2SC4617(S)
ACTIVE
FILTER
TP3
AUDIO
MUTE SW
Q302
R:3.8V
2SK1824-A
WNRC
TIBI
5MS
TI
BUSY
APC
TXD
PTT
TO
B
WNTC
TO VOLUME
MUTE
AFCO
RX
SB
TO AF AMP
G
SCHEMATIC DIAGRAM
L8
VCO TX
6.8u
Q4
C32 2SK1875-F(V)
100p
T:0.6V
R:0V
D5
TX MODULATION
R17
100k
L9 VCO RX
Q3
2SK1875-F(V)
6.8u
C33
39p
C305 R303
0.01u(J) 3.3k
AUDIO AMP
R317
ACTIVE FILTER
270k(D)
IC300
NJM2902V-ZB
R312
12k 1 14
C309 2 13
0.01u(J) 3 12
4 11
VDD VSS
5 10
C316 6 9
0.01u(J) 7 8
R:1.8V
R321
22k
C321 C320
0.033u(J) 0.033u(J)
R:2.1V
R326
5.6k(D)
R508 C507
1k 2.2u4
C505 R506
1u 820
R503
6.8k
VR500
68k
H
RF BUFFER AMP
Q6
2SC5108(Y)F
C44
0.5p
DC SW
Q5
2SJ243-A
DC SW
Q7
UMC4N
T:0V
R:4.2V
RIPPLE FILTER
2SC4617(S)
CURRENT
STEERING
C301
0.018u
R304
1M
R302
5.6k
C303
0.1u
R311
0
R307
47k
Q303
DTA144EE
DC SW
W:4.8V
N:0V
5MS
TI
BUSY
B
APC
TXD
PTT
ACTIVE
ACTIVE T:3.0V
FILTER
FILTER
R514 Q502
Q501
2SC4617(S)
2SC4617(S)
33k
T:2.7V T:2.7V
R510 C509 R515 C511
3.3k 3300p 33k 0.047u
I
TK-2102G
RF AMP
T:2.5V
Q100
R:2.5V
2SC5108(Y)F
C47 C100
33p 15p
R:0V
T:0.4V
L14
R27
1k
Q8
T:4.2V
R:4.2V
T:0V
R:4.3V
R320
47k
ACTIVE
FILTER
IC301
NJM2904V-ZB
1 8
V+
2 7
3 6 R318
QT/DQT
4 5 180k
GND
C338
56p
R323
100k
D300
DA221
R:2.0V
LIMITER
TIBI
T:3.0V
R519
33k
C512 R520 C514
3300p 33k 0.047u
DC SW
W:0V
Q500
N:5V
2SK1824-A
WNTC
X57-602 2/4
J
C103
22p
2nd Local
PABC
5R
5T
R:2.0V
AF
5MS
TI
BUSY
B
APC
TXD
PTT
T:1.3V
R523
6.8k
MUTE
AFCO
RX
SB
TO AF AMP
31