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L7
10uH
U29
8
1,2
VON
VIN
L8
10uH
T142
T132
R87
294K
1
V C M P
NPB-40
T135
T133
C76
D8
1U
MBR0520L
T134
C77
4.7pf
LT1944EMS
L9
7
PGND2
10uH
3
GND
9
PGND1
T138
C74
4.7pf
T137
D9
MBR0520L
U35
1
V C M P
LT1790BCS6-1.25
4
6
VIN
VOUT
C116
0.1uF
+12VR
R117
R116
R92
R114
1.0M
1.0M
1.0M
100K
T143
T144
V5DTP
V 5 A T P
V12TP
V12BT
R88
294K
R90
R115
R91
15.8K
38.3K
133K
T136
U31
VOUT
1
IN
3
SDN
R81
1.0M
LT1761ES5-5
C78
C84
0.1U
47U
C80
1U
R82
274K
U32
1
IN
R83
3
SDN
97.6K
LT1761ES5-5
C79
4.7U
R84
C86
845K
0.1U
+12VR
+12V
R89
+12VR -> J2 pin 1 (UI board) (pg1)
+12VR -> RP14 pin 3,4 (this page)
10R
+12V -> J6 pin 6 (MP506
connector) (pg7)
C117
1U
T145
U26
LP339
5
+
2
VCHK_OK 1
-
4
7
+
1
-
6
9
+
14
-
8
11
+
13
-
10
3
12
V+ GND
C72
0.1uF
+5VDIG
+5VDIG -> J6 pin 13
(MP506) (sheet 7)
5
OUT
4
BYP
4.7U
C87
0.01U
C89
T139
+5VANALOG
+5VANALOG -> J6 pin 10 (MP506) (sheet 7)
+5VANALOG -> R97 (sheet 1)
5
OUT
4
BYP
C90
C88
0.01U
4.7U
T140
Technical Discussion
+5VRDIG
+5VRDIG -> RP14 pin 2 (this sheet)
R99
+5VRDIG -> 232 level shifters (sheet 1)
+5VRDIG -> R99 (sheet 1)
10R
+5VRANA
+5VRANA -> RP14 pin 1 (this sheet)
R113
10R
Figure 29
SpO2 PCB
Schematic Diagram
(Sheet 3 of 7)
87
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Troubleshooting
