Mallinckrodt NELLCOR NPB-195 Service Manual page 93

TURN_OFF
PWR_BTN_RST
035262
VDD
I175
R106
20.0K
R97
3 3
10.0K
1 1
2 2
I174 I112
I180
RP5 RP5
3 3
10K 10K
1 1
7 2 8 1 Q18
2N3904S
From uP 2 2
Active LOW
VDD
R134
20.0K I194
R103
10.0K
3 3
1 1 Q15
2N3904S
2 2
I182 I111
I190
RP5 RP5
3 3
10K 10K
1 1
6 3 5 4 Q17
2N3904S
From uP 2 2
PWR_DLY
Active LOW
3_3V
R129
I187
100K
C93
0.1U
Z5U
I181
3_3V
3_3V
3_3V
R111
Q14
100K
2N3904S U28 U28
CD4011B 14 CD4011B
14 5
1
4
6
3
PWR_DLY 2
7
7
I185 I186
TP50
C144
I184 0.1U
Z5U
3_3V 3_3V
R130
U29
100K CD4011B I188
14
5
14
1 4 9
3 6
2 8
U29
7
7 CD4011B
3_3V
I183
R165
100K I189
R131
249
ONBUTTON
C98
0.01U
C143
0.1U
Z5U
U28
CD4011B TP51
14
9
10
8
7
3_3V
TP53
14
13
11
PWR_CTRL
12
U28
7
CD4011B
3_3V
CD4011B
U29
14
10 QL
TP54
7
3_3V
I191
3 3
14
R164
13 Q13
1.00K
11 QH 1 1 2N7002S
12
2 2
U29
7
CD4011B
BTN_PRS_L
To uP
Figure 11-15
Power On/Off Circuit Schematic Diagram
11-35