Kenwood TK-2140 Service Manual page 20

F
TX-RX UNIT (X57-6402-71)
UL
CP
DP
EP
5C X1
L77-1869-05
R36 1 4
VC VCC
0
2 3
GND OUT
16.8MHz
SAVE
INT
5TC
5T
+B
5R
SB
5MS
5M
RESET
EVSS
5CNS
5RC
CN300
DTMSD 1
DTMACK 2
GND 3
TEST 4
4
AFDAT 5
5
AFRTM 6
6
AFTRD 7
7
EM TONE SW 8
8
CLK 9
AFRDT 10
10
NC(OPTION) 11
MSK SW 12
12
AFDIR 13
13
5CNS 14
LIMITSW 15
15
SSW 16
BEEP 17
GND 18
5C 19
GND 20
MICI 21
PTT 22
ME 23
ME 24
TXHSD 25
GND 26
TXAF 27
RXAFI 28
5RC 29
HSDIN 30
RXAFO 31
GND 32
DTMSTD 33
DTMPD 34
G
SCHEMATIC DIAGRAM
R824
1k
LD PROTECT
PLL IC
IC801
LMX2316TMX
9 8
GND3 OSCI
10 7
CE VCC1
R825 11 6
CLK FIN
1k 12 5
DATA FIN
13 4
LE GND2
14 3
CP2
FO/LD GND1
1k*2
15 2
VCC2 CPO
16 1
VP FLO
4.89V
C2
1000p
L1
R826 C9
4.7u
0 1000p
DET-2
D300
RB706F-40
AF AMP BIAS
1
2
3
4
R322
150k
R324
470k 1
R325 2
360k 3
4
LSD LPF
HSD LPF
C322
1
1500p
2
R327
3
47k
4
BEEP
ME
DTSTD
SSW
DTCLK
5RC
DTMPD
SSW
PTT
H
C838 C831
1000p 15p
L807
27n
5.00V
R809 R811 R813 R814
2.2k
0 0 0
AF BUFFER
5.00V
TUNE
IC303
TC75W51FUF
C313
1 8
0.1u
VDD
2 7 R316 R319
3 6 100k 68k
4 5
VSS
AF AMP,FILTER
C390
0.1u
C318
LSD BUFFER
330p
TO TCXO
IC302
TC75W51FUF 5.00V
R323
8
VDD
82k
7
6
R318
5
VSS
68k
AF AMP,FILTER
LSD LPF
5.00V
IC306
TC75W51FUF
8
VDD
C325
7
0.012u
6
R330 R334
5
VSS
180k 180k
AF AMP,FILTER
IC304
TC75W51FUF
8
5.00V
VDD
7
6
2.50V
V REF
5
VSS
AF AMP,FILTER
I
TK-2140
T:4.50V
R:4.48V
R817
100
C840 C832
10p 24p
L808
C31
27n
10p
T:0.43V
Q803
R:0.43V
2SC5010-T1-A
F IN RF AMP
CV
L802
5CNS
5.00V
POTENTIAL METER
IC307
M62364FP-F
1 24
VIN1 VIN8
2 23
VOUT1 VOUT8
3 22
VOUT2 VOUT7
4 21
VIN2 VIN7
5 20
VDD GND
R397 6 19
LD RESET
0 7 18
CLK VDAref
8 17
DI DO
C320 9 16
VIN3 VIN6
0.1u 10 15
VOUT3 VOUT6
11 14
VOUT4 VOUT5
12 13
VIN4 VIN5
R320
12k
R907
AF AMP,FILTER
4.7k R908
IC305
TC75W51FK(F)
4.7k
C394
1 8 5.06V
8
0.1u
2 7
3 6
R314 C399
R308
4 5
4
100 3.3k
5600p
R313
C391 0.01u
0
LSD SUM HSD AMP
R340 R342
10k 22k
C330 R341 R343
0.1u 10k 10k
X300
9.8304MHz
L77-1810-05
CLK SHIFT
CLK SHIFT
ON :2.68V
ON :3.42V
OFF:0.83V OFF:0V
EEPROM
R348
IC310
4.7k
AT24C16A10SU18
Q300
2SC4649(N,P)
1
1
CLK SHIFT BEAT
2
ON :2.88V SHIFT
2
OFF:2.45V SWITCH
3
3
4
4
J
5C
SAVE
INT
5TC
5T
APC
+B
5R
SB
5MS
5M
CLK
DATA
RESET
EVSS
5.00V
LSDO
HSDI
DSTB
BEEP
HSDO
XOUT
XIN
5.00V
8
8
7
7
6
CLK
6
V_REF
5
5
EVSS
ME
DTSTD
SSW
DTCLK
5RC
DTMPD
SSW
PTT
X57-640 2/5