Mallinckrodt Nellcor N-20PA Service Manual page 84

Portable pulse oximeter
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EX_OUT LSB
U18
2
19
AD0
D1
Q1
3
18
AD1
D2
Q2
4
17
AD2
D3
Q3
5
16
AD3
D4
Q4
6
15
AD4
D5
Q5
7
14
AD5
D6
Q6
8
13
AD6
D7
Q7
9
12
AD7
D8
Q8
11
EXOUTEN
CLK
1
OC
R132
74HC574
150K
TP82
TEST
EX_OUT MSB
U17
AD8
2
19
D1
Q1
AD9
3
18
D2
Q2
AD10
4
17
D3
Q3
AD11
5
16
D4
Q4
AD12
6
15
D5
Q5
AD13
7
14
D6
Q6
AD14
8
13
D7
Q7
AD15
9
12
D8
Q8
EXOUTEN
11
CLK
PR_STROBE
1
OC
74HC574
R123
VCC
150K
DISP_DATA
DISP_CLK
RTC_CLK
RTC_RST
PR_MOTOR
PR_MEAS
BEEP_1
BEEP_2
PR_DOT6
PR_DOT5
PR_DOT4
PR_DOT3
PR_DOT2
PR_DOT1
PR_DOT0
RTC_IO
R148
150K
R150
150K
R152
150K
R154
150K
Output Port Circuit
R149
150K
R151
150K
R153
150K
Figure 9-20
9-41

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