Datex-Ohmeda 7900 - Page 176

8 /Schematics
8-20 7900 Ventilator- 1503-0151-000 1-97
Figure 8-19
Power supply board schematic diagram, page 3 of 5
P2
SIGNAL=CHAS_GND;10,11
50V
0.001UF
C104
10%
10%
50V
0.001UF
C105
50V
0.001UF
C99
10%
50V
0.001UF
C98
10%
C113
0.01UF
10%
250V
C24
0.1UF
10%
50V
V_BATT
SH4
I_BATT
SH4
TP2
TP1
35V
10%
C102
1UF
ISO_TXDA
ISO_RXDA
R124
1.00K
1/8W
1%
R126
1.00K
1/8W
1%
R109
1.00K
1/8W
1%
R110
1.00K
1/8W
1%
4.32K
R113
1%
1/8W
C101
0.1UF
10%
50V
4.32K
R119
1%
1/8W
T2
1/8W
4.99K
1%
R102
U22
MAX251
4.32K
R26
1%
1/8W
U14
MAX250
35V
10%
C32
4.7UF
CR12
SMBJ16CA
4.32K
R27
1%
1/8W
RXDB
SH4
RXDA
SH4
TXDB
SH4
TXDA
SH4
1/8W
4.99K
1%
R103
U5
AD822AR
AD822AR
U5
R1
4.99K
1/8W
1%
0.1UF
C70
50V
10%
0.1UF
C80
50V
10%
50V
C4
0.01UF
10%
50V
C8
0.01UF
10%
124K
R86
1/8W
1%
R72
49.9K
1/8W
1%
124K
R85
1/8W
1%
50V
C9
0.01UF
10%
R7
499K
1/8W
1%
R22
499K
1/8W
1%
50V
C3
0.01UF
10%
R71
49.9K
1/8W
1%
BATT_P
SH1
BATT_CUR_SEN
SH1
35V
10%
C103
1UF
35V
10%
C97
1UF
CR33
914
R55
4.99K
1/8W
1%
ISO_RXDB
ISO_TXDB
HCPL-2531
U18
HCPL-2531
U21
P3
SIGNAL=CHAS_GND;5,6
SMBJ10CA
CR29 CR30
SMBJ16CA
SMBJ10CA
10V
CR11
5
4
3
9
8
7
2
1
6
VDD
1
34
6
2
R2IN
R1IN
V+
T2OUT
T1OUT
V-
RTRI
ISOGND
AC
T1DIN
T2DIN
R1LDR
R2LDR
BYP
13
8
14
1
6
5
4
3
2
12
11
10
9
7
SHDN
EN
D1
VCC
T1LDR
T2LDR
R1DIN
R2DIN
D2
T1IN
GND
T2IN
R1OUT
R2OUT
3
13
24
5
8
1
7
9
12
11
10
6
14
VDD
5
6
7
8
4
3
2
1
-15V+15V
4
3
2
1
8
7
6
5
1
2
3
4
8
7
6
5
1
2
3
4
DGND