Kenwood NX-900 Service Manual page 97

BN
TX-RX UNIT (X57-8060-10) (A/2)
SPO
80C
SB
/PSW
9
AFO
/PRST
50C
RXD1
R633
SCRXD
33M
SCTXD
TXD1
9
4
5
50C
5.01V
LEVEL SHIFT
(AND ITXD1/SCTXD)
9
MI1
ME
BO
SCHEMATIC DIAGRAM
CN597
30
SPO
29
SPO
28
SPO
27
C580 SPO
26
SPO
100p
25
SPO
C581
24
GND
100p
23
80C
C582 22
SB
100p
21
SB
C583
20
NC
R630
100p
1k
19
PSW
18
GND
C584
17
GND
100p
16
MIC
C585
100p
15
ME
C586
14
GND
0.01u
13
AFO
12
/PRST
C587 100p
11
GND
Q501 10
GND
SSM6N17FU
DC SWITCH
9
GND
8
GND
C588
7
SHIFT
100p
6
50C
C589
5
NC
100p
4
TXD
D504
3
RXD
C825 2
1SS416
GND
1
100p
REVERSE GND
CURRENT
0
PREVENTION
(RXD)
C590
0.01u
IC512
TC7SET08FU-F
oUTY 3
GND
2
INA 1
VCC
INB
BP BQ
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)
BR
NX-900
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
97
X57-806 (A/2) 14/14, X54-368 1/3
15
80C
/PRST
5C
TXD
RXD