Nellcor OxiMax N-550 Service Manual page 122

+5V
C8
120pF
TP20
U7
T POINT M2
1
N.C
R8 2
ANODE
3
TX2
CATHODE
4
390 N.C
+5V
R10
TP21
U8
T POINT M2
8
390 Vcc
7
ENABLE
6
RX2
Vout
5
GND
U21
1
GND
2
NA
3
+5V
VIN
4
NA
5
NA
6
NA
7
NA
8
NA
9
0V
10
NA
C64 11
-V
1uF
3216
Isolation DC/DC
LP1
800V Arrestor
N-550
+5VF2
R9
TP22
6N137
T POINT M2
8
Vcc 390
7
ENABLE
6
TX2F
Vout
5
GND
+5VF2
C9
120pF
TP23
6N137
T POINT M2
1
N.C
2
ANODE
3
RX2F
CATHODE
4
N.C R11
390
+12VF
LM78L05A/TO-92
NTV0512
1
VIN
22
NA
21
C63
NA
C1
20
NA
47uF
19
47pF
NA
18
16VEL
NA
17
NA
16
NA
15
NA
14
+V
13
NA
12
NA
TP56
T POINT M2
U9
+5VF2
2
VOUT
C62
C2
47uF
47pF
16VEL
TP57
+5VF2
T POINT M2
1
+12VF
R12
J5 CON14A
3.9K
2 1
4 3
6 5
C14
8 7
C16
1uF
10 9
47pF
12 11
14 13
RX2F
TX2F
MP506 Connector
C49
C50
10pF
10pF
Figure 48: Main PCB Isolation
for MP-506 Schemativ Diagram
Technical Discussion
+5VF2
C58
C15
1uF 120pF
113