Nellcor NPB-190 Service Manual page 76

AD822 BYPASS
+10V
C19
0.01U
C21
0.01U
I3
R10
-5V
88.7K_0.1%
VREF
+10V
R6
2.00K I2 +
2
R7
-
51.1K
3
+
-
I1
R8
-5V
1.00M
R9
88.7K_0.1%
+10V
GND
U12
I4
DG201S BYPASS 13
V+
+10V 1
3
GND V-
+
C56 5 4
22U
20V
7343
-5V
-5V
GND
035191
I11
VCC
U1
16 16
VCC INH
A
B
C20 14 14 C 9
X
TP5
0.01U
15 15 XO 12
Y
X1
4 4
Z
Y0
Y1
7 7
VEE
Z0
8 8
VSS Z1
U4
-5V
AD822 CD4053S
8
1
I9 I10
4
R15 R16
I7
82.5K 82.5K
+10V
I5
U12
TP8
13 DG201S TP6
V+
8
7
6
V-
5 4
DG201S
-5V
2
+10V
I6
U12
13 DG201S
V+
9
10
11 I8
V-
5 4
TP7
-5V
VREF
I12
14 VREF
1
3
2
U6
7
74HC00S C22
0.01U
VREF
U6
74HC00S
14
4
6
5
7
6
11 11
10 10
9
VREF
13 13
RED CHANNEL
C7
2 2
1 1
0.1U
C25
5 5
Z5U
0.12U
3 3
R12
VREF
C24
I25
100K
C23 220P
1000P
1.00K
VCC
2 2
R77
Q7
2N3906S
1 1
R13
3 3 +10V
100K
I21
U4
+
AD822 C26
6 8 0.068U
-
R11
7
3.32K
5
+
4
-
C1
TP9
0.47U
+
25V
I17
IR CHANNEL
-5V
3216
C14
VREF
0.12U
R1
I26 VREF
100K
C13
C15
1000P
1.00K 220P
2 2
R109
Q6
2N3906S 1 1
R4
3 3
+10V
100K
I171 I22
U7
7 7 5 5 C16
LF441S
2 2 0.068U
R3 -
6 6
3.32K
3 3
+
4 4 1 1 8 8
TP2
C2
0.47U
+
I173
25V I18
I172
3216
-5V
VREF
I13 I14
I16 I15
TP10
I23
+10V R14 VREF
C27
100K
0.12U
+10V
+
CR4
I19
9 4 1N914S
-
TP11 +
8
10 13 4
+ R17 -
11 U10 14
100K
-
LF444CM 12
+
11
-
CR3 C28 U10
1N914S 0.068U LF444CM
-5V
-5V
TP4 I24
R2
100K
+10V
C17
VREF
0.12U
+10V
I20 +
2 4 CR1
-
1 1N914S
TP3
+
3
+
11 U10 6 4
R5 -
-
LF444CM 7
100K
5
+
11
-
CR2
1N914S C18 U10
-5V LF444CM
0.068U
-5V
FRONT END RED/IR
Front End Red/IR Schematic Diagram (1 of 10)
IRLED/AV
PWM2
G_PWM2
G_MUX1
G_REDDC
G_IRDC
SAMPIR
SAMPRED
G_LEDDR
OFF/ON
Figure S-3
S-11