Mallinckrodt Nellcor N-20 Service Manual page 76

TO: N-20
MAIN PCB
JP18
GO_SW
1
2
3
4
5
6
7
8
PWR_DOWN
9
VCC
TP72
R102
TEST
15K VCON
GO_BTN
R78
150K
R79
3.32K
C66
VCON
.01UF
L11
R110
475K
TP71
R81
C123
TEST
3.32K
100PF
Q15
2
3
6 8
LT1046
VCON
U21
4
SET1
PWR_ON
2 5
D1 Q1
3 6
CLK1 Q1
1
RST1
10
SET2
12 9
D2 Q2
11 8
CLK2 Q2
13
RST2
14 7
VCC GND
74HC74
C110
C67
0.1UF
0.1UF TP73
TEST
VCON
CR11
TP84
VBAT
TEST
1N914
C68
0.1UF
TP83
TEST
GO BTN
JP9
PIN 17
Power Control Circuit
Figure 9-25
9-45