Nellcor OxiMax N-550B Service Manual page 129

+5V
C17
120pF
1
N.C
2
R14 ANODE
3
TX1
CATHODE
4
390 N.C
TP24
T POINT M3
+5V
C67
120pF
1
N.C
2
R29
ANODE
3
Nurse Call 2
CATHODE
4
390 N.C
TP44
T POINT M3
+5V
R16
U12
8
390
Vcc
7
ENABLE ANODE
6
RX1
Vout CATHODE
5
GND
TP25
6N137
T POINT M3
+5V
C81
U31
120pF
1
N.C
2
R38
ANODE
3
TX422EN
CATHODE
4
390
N.C
TP49
T POINT M3
U19
1
GND
2
NA
3
+5V
VIN
4
NA
5
NA
6
NA
7
NA
8
NA
9
0V
10
NA
11
-V
NTV0505
N-550B
+5VF1
R15
U11
8
Vcc 390
7
ENABLE
6
TX1F
Vout
5
GND
TP26
6N137
T POINT M3
+5VF1
U27 R28
8
390
Vcc
7
ENABLE
6
TX1F_N
Vout
5
GND
TP45
6N137
T POINT M3
+5VF1
C18
120pF
1
N.C
2
R17
3
RX1F
4
390
N.C
TP27
T POINT M3
+5VF1
R37
8
390
Vcc
7
ENABLE
6
ITX422EN
Vout
5
GND
TP50
6N137
T POINT M3
+5VF1
22
NA
21
NA
20
+5V
NA
19
NA
18
NA
17
NA
16
NA
15
NA
14
+V
13
NA
12
NA
Nurse Call 1
TP48
T POINT M3
4
C21
1uF 5
12
RX1F
9
11
TX1F
10
TX1F_N
6
C118
10pF
C119
10pF C23
1uF
C120
10pF
R30
4.7_2012
RX1F
ITX422EN
TX1F
C121
10pF
C122
10pF
C123
10pF
R39
R1
470
4.7_2012
U24
1 8
Anode N.C
2 7
Cathod N.C
3 6
Anode N.O
4 5
Cathod N.O
AQW614
Relay
U14
1
C+ C+
C22
3 1uF
C- C-
U13
13
O1 R1
1 8
L1I L1O
8 2 7
O2 R2 L2I L2O
3 6
L3I L3O
14 4 5
I2 T1 L4I L4O
TP15
7 ZJYS51R5-M4PA(T)
I1 T2
T POINT M3
2 TP54 TP55
V- V+
T POINT M3
T POINT M3
MAX232S
N.O.
C24
N.C.
1uF
C25
COMMON
0.1uF F2 500mA
C68
TP53
0.1uF T POINT M3
R31
4.7_2012
C70
TP14
1
T POINT M3 C80
2.2nF
+5VF1
0.1uF
U30
MAX489E/SO
TP52
1 14
NC VCC
T POINT M3
2 13
RSOUT NC U32
3 12 1
_RXENAB RXD+ L1I L1O
2
L2I L2O
4 11 3
TXENAB RXD- L3I L3O
4
L4I L4O
5 10
TXIN TXD-
ZJYS51R5-M4PA(T)
6 9
GND1 TXD+
7 8
GND2 NC
TP51
T POINT M3
C19
TP46
1
T POINT M3
0.1uF
C20
0.1uF
R2
4.7_2012
C38
2.2nF
+5VF1
N.O.
N.C.
COMMON
Technical Discussion
JDP1
1
1
9
9
2
2
10
10
3
3
11
11
4
4
12
12
5
5
13
13
6
6
14
14
7
7
15
15
8
8
CONN DSUB 15-P
Serial
Communication
Connector
8
7
6
5
Figure 51: Main PCB Isolation
for Interface Schematic Diagram
121