Nellcor OxiMax N-550 Service Manual page 125

C83 C85 C87 C89 C91
10pF 10pF 10pF 10pF 10pF
C84 C86 C88 C90
10pF 10pF 10pF 10pF
RF0
10pF 10pF 10pF 10pF 10pF RF2
C102 C104 C106 C108 C110 RE0
10pF 10pF 10pF 10pF RE2
C103 C105 C107 C109 RC4
RC6
RB0
RB4
RB3
RC2
N-550
R18
10K
R25
RB2
5K
POT
J3
Connector
DIN 44_AB-H
1 2
SEG a
A1 B1
3 4
SEG c
A2 B2
5 6
SEG e
A3 B3
7 8
SEG g
A4 B4
9 10
DIGIT 1
A5 B5
11 12
DIGIT 3
A6 B6
13 14
DIGIT 5
A7 B7
15 16
DIGIT 7
A8 B8
17 18
A9 B9
19 20
A10 B10
21 22
A11 B11
23 24
A12 B12
25 26
A13 B13
27 28
A14 B14
29 30
A15 B15
31 32
A16 B16
33 34
A17 B17
35 36
A18 B18
37 38
A19 B19
39 40
A20 B20
41 42
A21 B21
43 44
A22 B22
C28
47uF_35VEL
Alarm SW
+5VB
Power IN
Power OUT
VIN
Front BD Connection
C32 T POINT M5
0.47uF
RG0
R20
5.1K
+5V
D5
C30
B140
0.1uF
1 2 3 U17A
+
1
2
C29
R19 -
C31 LM324/SO
820pF
100K_F
22nF
SEG b
SEG d
SEG f
DP
C92 C93 C94 C95 C96
DIGIT 2
10pF 10pF 10pF 10pF 10pF
DIGIT 4
DIGIT 6
DIGIT 8
RF1
RF3
RE1
RC3 10pF 10pF 10pF
RC5 C111 C112 C113
RC7
RB1
RB5
RE3
C117
10pF
47uF_16VEL
TP17
+5V
C33 C34 C35 C36
C37
0.1uF
47uF 47uF 47uF 47uF
16VEL 16VEL 16VEL 16VEL
U16 TDA7052A
TP18
1 6
T POINT M5
VCC GND1
R21
1K 2 5
VI2 VO1
4 8
VI4 VO2
7 3 TP19
TP16
NC GND2
T POINT M5
T POINT M5
Alarm Sound Module
PHONEJACK
J6
STEREO SW
Foot SW/Antenna Phone jack
C97 C98 C99 C100 C101
10pF 10pF 10pF 10pF 10pF
10pF 10pF 10pF
C114 C115 C116
Figure 51: Main PCB Interface and
Speaker Control Schematic Diagram
Technical Discussion
C82
S1
J7
1
S2
2
120pF
CON2
+5V
anteld
MR1
4.7K
Alarm SW
MC1
1uF
119