Nellcor NPB-190 Service Manual page 79

I84
1
C11
CR10
0.1U
1N914S
Z5U
C62
1000P
I73
5%
I29
C60 R65
+
10U 4.99K
16V
035191
VDD
+
C61 C63
U14 I75 330P 47U
1 5 5 10V
VC VIN
7343
I76
4 4 8 8 VSW
S/S VSW
R64
6 6 2 2 VFB
GNDS FB
49.9
7 7 NFB 3 3
GND
I85
LT1373S
HIGH
CURRENT
VCC
R63
R66
11.5K 36.5K
TP15
I41
T1 CR8 RAW+10V
LPE-4841 R68
MBRS130
182
C10 2 2 2 6 6 2 1 1 8
0.1U
C66
Z5U +
22U C67
TP28
7 7 3 3 20V VCC I79 22U
I78
7343 20V
7343
5 5 2 2 1 1
CR9
R67
+
MBRS130
4 4 C64 49.9
47U
10V
8 8 7343
C59
0.1U
1 1
I77
+
C65
47U RAW-5V
CR7 10V R71
49.9
7343
1 1 2 2
MBRS130
C58
I80 0.1U
Z5U
I81 VREF
U8
VIN 8 1 1
VIN VOUT
2 2 6 6
+
GND1 GND3
3 3 7 7 C12
GND2 GND4
0.1U
78L05D
Z5U
TP22
+10V
TP16
I82 +5.7V VREF
R70
+
C70 10.0K 3 3
1 1
22U Q4
20V 2N3904S
Z5U
2 2
7343
3 3
1 1
Q5
2N3904S
2 2
TP23 -5V
C69
22U
+
20V
7343
Front End Power Supply Schematic Diagram (4 of 10)
R69 I83
1.0
5%
+
C68
22U
20V
7343
Figure S-6
S-17