Figure 48: Main Pcb Isolation For Mp-506 Schematic Diagram - Nellcor OxiMax N-550 Service Manual

+5V
C17
120pF
R14
TX1
390
TP24
T POINT M3
+5V
C67
120pF
R29
Nurse Call 2
390
TP44
T POINT M3
+5V
R16
8
390
7
6
RX1
5
TP25
T POINT M3
+5V
C81
120pF
R38
TX422EN
390
TP49
T POINT M3
+5V
R39
+5V
470
Nurse Call 1
TP48
T POINT M3
N-550
+5VF1
R15
6N137
U11
1 8
N.C Vcc 390
2 7
ANODE ENABLE
3 6 TX1F
CATHODE Vout
4 5
N.C GND
TP26
T POINT M3
F
+5VF1
U27 6N137 R28
1 8
390
N.C Vcc
2 7
ANODE ENABLE
3 6 TX1F_N
CATHODE Vout
4 5
N.C GND
TP45
T POINT M3
F
+5VF1
C18
120pF
U12 6N137
1
Vcc N.C
2
F
ENABLE ANODE
3 RX1F
Vout CATHODE
4
GND N.C R17
390 TP27
T POINT M3
ITX422EN
+5VF1
R37
U31 6N137
1 8
390
N.C Vcc
2 7
ANODE ENABLE
3 6 ITX422EN
CATHODE Vout
4 5
N.C GND
TP50
F T POINT M3
+5VF1
U19 NTV0505
1 22
GND NA
2 21
NA NA
3 20
VIN NA
4 19
NA NA
5 18
NA NA
6 17
NA NA
7 16
NA NA
8 15
NA NA
9 14
0V +V
10 13
NA NA
11 12
-V NA
AQW614
U24
1 8 N.O.
Anode N.C
2 7
Cathod N.C
3 6 N.C.
Anode N.O
4 5
Cathod N.O
COMMON
U14 MAX232S
C21 4 1
C+ C+
1uF
5 3
C- C-
RX1F 12 13
O1 R1
9 8
O2 R2
TX1F 11 14
I2 T1
10 7
TX1F_N
I1 T2
T POINT M3
6 2
V- V+
C118
C119
C23
10pF
10pF
C25
1uF
0.1uF
C120
C68
10pF
R30
0.1uF
4.7
F
2012
C70
2.2nF
F
U30 MAX489E/SO
1
NC
2
RX1F
RSOUT
3
_RXENAB
4
TXENAB
5
TX1F
TXIN
C121
6
GND1
10pF 7
GND2
C122
10pF
C123
10pF
C19 0.1uF
C20 0.1uF
F
R1
4.7
2012
C38 2.2nF
F
C22
JDP1
1uF U13
ZJYS51R5-M4PA(T) 1
1
9
9
1 8 2
L1I L1O 2
2 7 10
L2I L2O 10
3 6 3
L3I L3O 3
4 5 11
L4I L4O 11
4
TP15
F
4
12
TP54
12
5
T POINT M3 TP55
5
13
T POINT M3 13
6
6
14
14
C24
7
N.O.
7
15
1uF
15
8
N.C.
8
COMMON
F2
CONN DSUB 15-P
500mA
Serial
TP53
Communication
R31 T POINT M3
Connector
4.7_2012
TP14
T POINT M3
1
C80 0.1uF
+5VF1
F
TP52
14
T POINT M3
VCC
13
U32
NC
12 1 8
RXD+ L1I L1O
2 7
L2I L2O
11 3 6
RXD- L3I L3O
4 5
L4I L4O
10
TXD-
ZJYS51R5-M4PA(T)
9
TXD+
8
NC
TP51
T POINT M3
TP46
1
T POINT M3
R2
4.7
2012
+5VF1
Technical Discussion
Figure 49: Main PCB Isolation
for Interface Schematic Diagram
115