Kenwood TH-D72A Service Manual page 69

P
TX-RX UNIT (X57-784X-XX) (A/3) : CONTROL SECTION
1200 TData
MOD
DAC_RST
DAC_EN
CNT_CLK
CNT_DT
3 . 3V
R 8 4 7
0
PKTBND
ANALOG SWITCH
WXCTIN_B
WXCTIN_A
SWITCH
Q 7 2 0
S S M 3J0 5 F U -F
TAB_S
GP_BU
B
4.7V AVR
I C 7 1 9
N JM 2 8 7 2 A F 4 7
1 VIN
VoUT
2 GND
3 CoNTRoL
NoISEBYPASS
33C
9600 TData
Q
SCHEMATIC DIAGRAM
R 8 6 1 4 7 k
7
CSN
Vout7
24
8
SCLK Vout6
23
9
SDATA Vin6
I C 7 2 1
22
10
A K 2 3 3 0
DVdd Vin5
21
11
Vss Vout5
20
12
Avdd Vuot4
19
D/A CONVERTER
C 8 7 6
4 . 7 u 6.3
3 . 3 V
TAB
N J M 2 1 1 2 V - Z B
1.7V
1 AoUT
2 A-IN
3 A+IN
4 V+
5 B+IN
C 8 73 R 8 5 4
R 8 55
6 B-IN
7 BoUT
4 . 7 u 8 2 k 82 k
6.3
R 8 5 3
C 8 8 2
4 7 0 k
C 8 8 3
6 . 8 V
AVR
Q721
4.7V
1 2 A 0 2 C H
R 8 4 9
3.3k
C 8 6 7
4 7 0 p
Q 7 2 2
2 SC 4 6 1 7 (R )
AVR
5
4
D 7 4 0
CONSTANT
VOLTAGE
R
TH-D72A/D72E
R 8 8 6
R 8 7 9
1 0 0 k 1 0 k
R 8 7 6
1 0 0 k
R 8 7 7 1 k
B P F A
R 8 7 8 1 k
A P C & B P F B
D E T _ A
D E T _ B
R 8 6 9
A V R E F
1 0 0
I C 7 2 2
R 8 7 0
2 2 0 k
14
DoUT R 8 7 3 C 8 9 7
R 8 7 1
13
D-IN
1 0 k
12 1 0 k 4 . 7 u
D+IN
11
V-
10
C+IN
R 8 7 4 C 8 8 9
R 8 7 2
9
C-IN
8 2 k
8 82k
4 . 7 u
CoUT
6.3
R 8 6 4
0 . 1 u
4 7 0 k
1 0 0 0 p
I C 7 2 2
OP AMP
3 . 3 V
DC_DET
RXD_S TXD_S
CN766 CN767 CN742
TX-RX UNIT
(X57-784X-XX)(C/3)-CN611
S
1200 TData
R 8 8 8
REF_A
CN732
1 0 k
BV
+B
CN764
LAMP
GP_BU
RST_S
CN711
TX-RX SECTION
:
X57-784 (A/3) 4/8
T
33C
9600 TData
RST_S
69