Kenwood TK-2140 Service Manual page 23

U
TK-2140
TX-RX UNIT (X57-6402-71)
D102
D102,103
HVC131 ANT SWITCH
D103 C146 L113 L114 L115
HVC131 1000p 7T 7T 6T
C148 C150 C153
10p 12p 7p
D104,105
T:0.80V
ANT SWITCH
R:0V
R145 L120 C151
0 56n 33p
Q108
DTA144EE
R137
1M
APC SWITCH
APC SWITCH
R141
100k
Q107
2SK1824-A
5RC
APC
5R
T:0V
R:2.40V
C294 R276 R238 R275 C251
0 0 0
1000p 6p(B)
CLK
DATA
PF
SB
5MS
L304
Q303 D305
AF AMP AVR
AF AMP AVR
Q302
AF AMP AVR SWITCH
R367
10k
Q303
R358 2SB1132(Q,R)
0
T:0V
R:4.88V(ON)
Q302
:0V(OFF) 2SC4617(S)
R359
15k C346
47p
R362
D301 47k
CP327
D301 C348
AF AMP
47k*2
PROTECT
1SS373F 0.47u
R361
1k
R:4.96V(I)
PROTECT
:0V(E)
Q301
2SJ347F
MIC MUTE
D303,307
PROTECT
C344
R357 10u6.3
5M
470
AM
LEDR
ME
LCDBLT
LEDG
SSW
PTT
20
X57-640 5/5
V W
SCHEMATIC DIAGRAM
Note : The components marked with a dot (
ANT
CN13
LCD ASSY(B38-0859-05)
CN302
14 GND
L320 13 VCC
R603 12 CS
CS
470 R604 11 SCLK
R605 470 10 SID
470 R606 9 SOD
R607 470 8 VEE
470 R608 7 SKEY
SKEY
R609 470 6 AKEY
AKEY
470 R610 5 BKEY
BKEY
R611 470 4 CKEY
CKEY
470 R612 3 LEDA
R613 0 2 LEDK
0 1 NC
T:0V
R:4.68V
D205,206
BPF TUNING
C289 R274
1.5p 0
(B)
C353
T:0V
R:1.60V(I)
0.1u
AF POWER AMP
:0V(E)
IC313
TDA7053AT
Q308
1 16
INT/EXT
NC1 OUT1+
SWITCH
2 15
VC1 NC4
3 14
NC2 PGND1
4 13
Q308
2SK1824-A VI<1> OUT1-
5 12
VP OUT2-
6 11
VI<2> NC3
C356 7 10
SGND PGND2
47p 8 9
VC2 OUT2+
T:0V
R:0V(I)
:1.60V(E)
C354 Q307
0.1u UPA672T-A
R368
Q305
1.0k
UPA672T-A
Q305.307
INT/EXT SWITCH
C352
0.1u
X
T:0V
FRONT-END RF AMP
R:1.70V
T:0V
R:4.78V
Q207 R720 C261
3SK318
47 4.5p
T:0V
(B)
R:0.69V
L307
L308
D302 D306
DA221 DA221
D302,306
SURGE ABSORPTION
5M
R363 R369 R373 R376
56k 120k
120k 10k
TH300 -t 150k
LCD AVR
C350 L305
1.83V
Q304
3.3u4 L306
2SC4617(S)
T:7.28V
Q309
R:7.49V(ON)
:7.51V(OFF) BUSY LED SWITCH LCD LED AVR
Q306
TX LED SWITCH LR LG LBL
2SA1362-F(Y)
T:4.92V
Q306 Q309
R:0V
2SC4617(S) 2SC4617(S) T:0V
R:4.91V(ON)
:0V(OFF)
R391
Q310
330
2SC4617(S)
R386
330
C369
100p
D309 D310 Q310
LCD LED
TX RED LED RX GREEN LED
AVR SWITCH
Y
●
) are parts of layer1.
D208
BPF TUNING
R273 R272 C267
0 0 2p(B)
C269
9p
(B)
D207
BPF TUNING
R:4.96V(I)
:0V(E)
14
13
12
L313 11
L312 10
R385 47
9
8
R383 100
7
R378 100
6
D308
NNCD6.8G-A
5
MIC INPUT PROTECT
L309 4
L310 R380 100 3
L311 R381 100 2
1
T:0V
R:4.98V
CN303
PTT
SW1
SW2
GND
CN304
LAMP
ON :5.08V
OFF:0V
Q311
TX-RX UNIT
(X57-6402-71)
(C/3)
T:TX
R:RX
I:INTERNAL
E:EXT.SP MIC
W:WIDE5K
S-W:WIDE4K
N:NARROW
1
2
3
CN305
CN306
4
CN301
SSW
SP+
SP-
MSW
EMC
ME
PTT
PF
NC
E
5M
TXD
5
RXD
NC
S600
PTT
S601
SW1
6
S602
SW2
7