Kenwood TK-2140 Service Manual page 19

A
TK-2140
1
TX-RX UNIT(X57-6402-71)(A/3)
BATT
7.50V
CN400
14
+B
13
+B
12
SB
11
SB
10
EN4
9
EN3
2
8
GND
7
EN2
6
EN1
5
VOL
4
5M
3
GND
2
AUXKEY
1
BATT S_DET
AUX
DET
KEY
3
4
TX-RX UNIT(X57-6402-71)(B/3)
5
Q507
AF FILTER
SWITCH
6
7
16
X57-640 1/5
B
SCHEMATIC DIAGRAM
7.50V
F400
L400
+B
F53-0324-05
SURGE
ABSORPTION
+B
CP400
47K*2
5MS
CP401
47k*2
R400
10k
4.96V
5MS SWITCH
Q400
2SJ347F
R404
1.0M
5MS
T:5.01V
PROTECT
R:5.01V
SWITCH
R401
470k(D)
T:0V
R:4.84V
Q403,404
5R SWITCH
R544
4.7k
Q500,506
Q506
MSK SWITCH
2SK1824-A
Q500
2SJ243-A
R522
A
47k
R545
R506 0
1M
R546
BASE BAND IC
0
IC501
AK2346
13
SCLK RDF/FD
14
DIR
15
R549
XOUT TDATA
Q507
16
2SJ243-A
4.7k
XIN
17
R550
VDD
C515 1200p 15k R508 18
EXPOUT
220k 19
R509 0
RXAFIN
EXTLIMIN
20
RXAF LIMLV
21
RXLPFO
TXINO
22
RXINO
23
RXIN AGND
R512 24
R503
TEST AGNDIN
150k
120k
A
C507 R511 C513 1
INPUT
0.1u
15k 0.1u 2
NC1
3
PD
4
OSCO
R514 5
R510 OSCI
1M 0 6
NC2
7
X501 3.58M
VSS LOAD
L78-0479-05
C
5M
5M AVR
IC401
XC6204B502MR
7.49V 7.21V
D405 1
VIN VOUT
RB521S-30 2
VSS
5M PROTECT
3
CE NC
DETECTOR
IC404
XC61CN5002NR
IC402
XC62GR5012PR
5.00V
1 5
NC VOUT
2
VIN
3 4
CE VSS
5CNS AVR
Q401
5MS SWITCH
2SK1830F
+B
5R
SB
5MS
Q404
5CNS
2SJ347F
T:4.19V
R:4.99V
5T SWITCH
Q405
KTA2015(Y)
T:4.76V
R:0V
T:4.86V
R:0V
Q403
5T
5R
DTC144EE
TCLK(9)
DIR(14)
SCLK(13)
DI/O(11)
5CNS(14)
LIMITER SWITCH
2.78V
R548
180k
12
11
DI/O
A
10
9
TCLK
8
R523 680k C525
VSS
7 C522
MOD
6
R517
C523
5 27k
4 R524 C526 R535
R520
390k
3 150k 0.01u 1M
TXIN C531
R521
2
390k
12p
1
4
A
VSS
A
A
5
VDD
4.99V
IC502 TC75S51F
C527 0.1u
AF AMP,AGC
14
VDD
13
5.07V
NC3 IC500
12 LC73872M
EST
DTMF DECODER
11
STD
10
ACK
9
SD
8
C517
0.1u
D
5.01V
5M
5
4
IC400
XC61CN4202NR
DETECTOR
5C AVR
IC403
XC6204B502MR 5C
1 5
VIN VOUT
2
VSS
3 4
CE NC
Q406
2SJ347F
SAVE SWITCH
IC901
TC75S51FE(F)
3
4
5TC SWITCH
2 D901
VSS
1 MA2S111-F
5
VDD
R408
R903
1k 47k
5TC BUFFER
R528 4.7k
TXMSK(4)
R529 4.7k
RCLK(5)
R530 4.7k
TCLK(6)
R531 4.7k
DIR(7)
R532 4.7k
SCLK(8)
R533 4.7k
SDI/MSKO(9)
R534 4.7k TEST(10)
Q505
DTA114EE
R543
4.7k
TX AF MUTE
Q501
2SJ243-A
1000p
0.1u
270p
R536 C537 R537 C541
100k 0.1u 10k R540 0.1u
AGC PROTECT
0
D500 HSM88AS-E
R539
3
1k
Q502
2
2SC4116(Y)F
1
Q504
A 2SA1586(Y,GR)F
R538
2.7k
D501 HSM88AS-E
Q502,504
AGC PROTECT
AGC
E
5M
5.06V
5C
SAVE
INT
5TC
5T
+B
5R
SB
5MS
5M
RESET
EVSS
5CNS
5RC
CN500
1 DTMSD
2 DTMACK
3 GND
4 TEST
5 AFDAT
6 AFRTM
7 AFTRD
8 EM TONE SW
9 CLK
10 AFRDT
11 NC(OPTION)
12 MSK SW
13 AFDIR
14 5CNS
15 LIMITSW
16 SSW
17 BEEP
18 GND
19 5C
20 GND
21 MICI
22 PTT
23 ME
24 ME
25 TXHSD
26 GND
27 TXAF
28 RXAFI
29 5RC
30 HSDIN
31 RXAFO
32 GND
33 DTMSTD
34 DTMPD