Nellcor OxiMax N-550 Service Manual page 129

FR9
+5V
10K
FQ1
2N2907A
FR1
1 3
FSEG a
15
FR10
+5V
10K
FQ2
2N2907A
FR2
1 3
FSEG b
15
FR11
+5V
10K
FQ3
2N2907A
FR3
1 3
FSEG c
15
FR12
+5V
FQ4
10K
2N2907A
FR4
1 3
FSEG d
15
FR13
+5V
FQ5
10K
2N2907A
FR5
1 3
FSEG e
15
FR14
+5V
FQ6
10K
2N2907A
FR6
1 3
FSEG f
15
FR15
+5V
10K FQ7
2N2907A
FR7
1 3
FSEG g
15
FR16
+5V
FQ8
10K
2N2907A
FR8
1 3
FDP
15
N-550
FJ1
2 1
B1 A1
4 3
B2 A2
6 5
B3 A3
8 7
B4 A4
10 9
B5 A5
12 11
B6 A6
14 13
B7 A7
16 15
B8 A8
18 17
FRF1
B9 A9
20 19
FRF3
B10 A10
22 21
FRE1
B11 A11
24 23
FRC3
B12 A12
26 25
FRC5
B13 A13
28 27
FRC7
B14 A14
30 29
FRB1
B15 A15
32 31
FRB5
B16 A16
34 33
B17 A17
36 35
B18 A18
38 37
B19 A19
40 39
B20 A20
42 41
B21 A21
44 43
B22 A22
DIN 44_AB-H
FC1
FRE3
1uF
TP32
1
T POINT F3
+5V
FC2
1uF
FSW9
Power ON/OFF
FC3
FR43
+5V
4.7K
1uF
FSW8
Alarm Silence
FRF0
FRF2
FRE0
FRE2
FRC4
FRC6
FRB0
FRB4
FRB3
FRC2
+5V
3
FQ9
2N2222A
ACLED
+5V +5V +5V
+5V +5V
3 3
1 3 1 1 1 3 1
FQ10
FQ11 FQ12 FQ13
2N2222A 2N2222A 2N2222A
2N2222A 2N2222A
FDIGIT 1 FDIGIT 2 FDIGIT 3 FDIGIT 4 FDIGIT 5
Figure 55: Front Panel Interface
and Drivers Schematic Diagram
Technical Discussion
+5V +5V
FQ16
2N2222A
3 1 3 1 3 1
FQ14 FQ15
2N2222A
FDIGIT 6 FDIGIT 7 FDIGIT 8
127