Kenwood NX-800 Service Manual page 145

BX
TX-RX UNIT (X57-7752-71) (A/2)
SPO
80C
SB
/PSW
9
AFO
/PRST
RXD1
R633
SCRXD
0
33M
SCTXD
TXD1
TC7SET08FU-F
9
4 oUTY
5
50C VCC
4.98V
LEVEL SHIFT
(AND ITXD1/SCTXD)
9
MI1
ME
BY
SCHEMATIC DIAGRAM /
CN597
30
SPO
29
SPO
28
SPO
27
C580
SPO
26
SPO
100p
25
SPO
C581 24
GND
1000p
23
80C
C582
22
SB
1000p
21
SB
C583
20
NC
R630
1000p
1k 19
/PSW
18
GND
C584
17
GND
100p
16
MIC
C585
100p
15
ME
C586 14
GND
0.01u
13
AFO
12
RST2 (LCDCE)
C587 1000p
11
(LCDCLK)
Q501 10
(LCDDI)
UPA672T-A
DC SW
9
(LCDDO)
8
GND
R523 47k
C588 1000p
7
SHIFT/MODEL
6
50C
C589
5
NC
1000p
4
TXD
D504
3
RXD
C825
2
1SS416
GND
1
100p
REVERSE (DM)
CURRENT
PREVENTION
(RXD)
C590
0.01u
IC512
3
GND
2
INA 1
INB
BZ CA
原理图
DISPLAY UNIT (X54-3680-10)
CN902
CH UP
2
SP
1
CH DOWN
CN901
1
SPO
2
SPO
3
SPO
4
SPO
5
SPO
3.12V
6
SPO
PSW
7
GND
8
80C
9
SB
10
SB
11
NC
12
/PSW
13
GND
14
GND
15
MIC
16
ME
17
GND
R901
0
18
AFO
19
/PRST
20
GND
21
GND
22
GND
23
GND
24
SHIFT
25
NC
26
5C
27
TXD
28
RXD
29
GND
30
GND
J901
8 DM/KVL
7 HK/RXD 5.01V
6 MIC
5 ME 5.01V
4 PTT/TXD
3 E
2 SB 13.52V
1 BLC/AFO 5.01V
D901
SURGE
ABSORPTION
(DM/KVL)
D902
SURGE
ABSORPTION
(HK/RXD)
CB
NX-800
R924
1k
R925
1k
"PF4" VOL UP
R922
1k
"PF3" VOL DOWN
R923
1k
"PF2" "PF1"
D908,911,912
KEY MATRIX
POWER
D907
OVER DC
SUPPLY
PROTECTION
LINE
PROTECTION
(SB)
C910 C912
100p 100p
C911 100p
DM/KVL
HK/RXD
PTT/TXDO
R902
1k
D904
SURGE
ABSORPTION
(BLC/AFO)
D903
OVER DC
SUPPLY
PROTECTION
145
X57-775 (A/2) 16/16, X54-368 1/3
15
80C
/PRST
5C
TXD
RXD