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SPO2 Side
+12
+5DIG
+5ANALOG
T95
T91
2
2
L5
L6
2512063017Y0
2512063017Y0
1
1
+12V
+5VDIG
+5VANALOG
T87
T88
T90
J6
1
2
3
RST_L5V
4
5
6
7
T X D 5 V
8
RXD5V
9
10
11
12
13
14
T92
T130
T94
HEADER 7X2
T124
DO NOT INSTALL
T98
MAIN BOARD
SIDE
P/S
SIDE
+5DIG
U20
3
14
A
Q A
4
13
B
QB
5
12
C
QC
625KHz
6
11
D
QD
10MHZ
2
15
PIC_CLK
CLK
RCO
1
CLR
7
ENP
10
ENT
9
LOAD
16
8
V C C
GND
74HC161PW
C60
0.1U
NPB-40
T93
RP17 100
1
RXD5V
2
1
RXD5V
3
4
6
PIC_TX5V
1
6
PIC_RED_IR5V
DIGICAL_IN5V
2
PIC_SYNC5V
3
4
RP18 100
RST_L5V 4
+5DIG
C66
C48
L4
10U
10U
U21
10V
10V
6
5
VIN
S W
1
RUN
T69
10UH
R74
PIC_SYNC5V
7
SYNC
100
8
T70
PLL_LPF
2
3
ITH
V F B
4
T71
GND
C64
0.01U
LTC1878
T73
C65
R61
220P
10.0K
5V to 3V LEVEL SHIFTER
U18
8
7
2
18
I0
O0
6
4
16
RXD3V 4
I1
O1
5
6
14
I2
O2
8
12
PIC_TX3V 4
I3
O3
8
11
9
I4
O4
PIC_RED_IR3V 4
7
13
7
I5
O5
6
15
5
I6
O6
5
17
3
DIGICAL_IN3V 4
I7
O7
PIC_SYNC3V 4
1
+3V
T64
OE1
19
OE2
10
20
GND
V C C
74LVC244APW
C45
0.1U
DIGICAL_IN5V
+3V Voltage
T2
+3V
2.994V +-
0.105V
4
DIGICAL_OUT_L
C47
C67
R52
C63
10U
10U
4
DIGICAL_PGM
768K
22P
10V
10V
T72
R53
280K
Board Edge Test Points
T101
T105
T103
T107
+2.5
T109
T113
T115
T117
T119
+3V
T102
T104
T106
T108
T110
T127
T111
T112
T114
T116
T118
+5ANALOG
U19A
3
4
PIC_RX3V
+
1
2
-
TLC3702C
RP16
3V to 5V LEVEL
2
3
+3V
1
4
SHIFTERS
C50
1M
0.1U
T68
U19B
5
4
T X D 3 V
+
7
6
-
TLC3702C
+12
+5
C49
0.047U
R69
25V
4.99K
T65
T6
RP13
1
4
MBT3906DW
5
2
3
Q8B
Q 8 A
2
MBT3906DW
47K
T66
RP21
T5
Q 9 A
4
5
5
MBT3904DW
3
6
T67
T4
2
7
1
8
2
10K
Notes:
Resistors are 1% 1/16W unless otherwise noted.
R Packs are 5% 1/32W unless otherwise noted.
CB junction of Q8B is used as a diode.
+5
Technical Discussion
PIC_RX5V 6
T X D 5 V
T X D 5 V 1
DIGICAL 6
D7
2
3
1
BAT54SWT1
Q9B
MBT3904DW
Figure 33
SpO
PCB
2
Schematic Diagram
(Sheet 7 of 7)
95
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Troubleshooting
