Datex-Ohmeda 7900 - Page 162

8 /Schematics
8-6 7900 Ventilator- 1503-0151-000 1-97
Figure 8-5
7900 SIB schematic diagram, page 1 of 2
13944
PSW1
TP16
O2_SENSE-
SH2
CHAS_GND;10,11
P3
SMBJ16A
CR4
VR2
MAX667CSA
PAT_RET
SH1
PRES_INSP
SH1,2
SDA2_EXP
SH2
SDA1_INSP
SH2
SCLK_MINUS
SH2
SCLK_PLUS
SH2
SMBJ13A
CR3
R19
2.55K
1/8W
1%
1%
51.1K
R20
1/8W
O2
SH1
R24
100K
1/8W
1%
C23
0.001UF
50V
10%
50V
0.01UF
10%
C6
50V
0.01UF
10%
C27
NEWO2+
SH2
DCGO+
10%
50V
C22
0.015UF
1%
88.7K
R23
1/8W
0.1UF
C36
50V
10%
PRES_INSP
SH1,2
TRACEWIDTH=250
O2_RET
SH1
1.5K
R12
1/8W
1%
1%
88.7K
R32
1/8W
SP720
U6
0.1UF
C24
50V
10%
10%
50V
C28
0.015UF
J1
4.99K
1%
R9
1/8W
2.00K
R26
0.1%
1/8W
PAT_RET
SH1
C10
0.1UF
50V
10%
10%
50V
C11
0.1UF
10%
50V
C32
0.1UF
10%
50V
C34
0.1UF
INSP_RET
SH2
PRES_EXP
SH1,2
EXP_RET
SH2
O2
SH1
PRES_PAT
SH1
O2_RET
SH1
1%
10K
R30
1/8W
12.1
1%
R27
1/8W
Q1
MJD3055
Q3
MJD3055
3.32K
0.1%
R28
1/8W
10%
50V
C21
0.015UF
1/8W
R31
5%
2.2
1/8W
R17
5%
2.2
1/8W
R21
5%
2.2
250VAC
100PF
20%
C42
R10
5%
2.2
1/8W
10%
50V
C12
0.1UF
0.1UF
C16
50V
10%
PRES_PAT
SH1
O2
SH1
E2_POWER
SH1
PRES_EXP
SH1,2
5%
R37
27K
2W
R29
5%
2.2
1/8W
10%
50V
C14
0.015UF
1/8W
R22
5%
2.2
E8
E9
LO_O2_PRES+
E7
TP7
TP5
TP12
TP15
TP14
TP8
TP6
VR1
MAX667CSA
10%
25V
10UF
C9
U3
AD694BR
E6
U8
AD694BR
210PCBM
U4
50V
C26
10%
0.01UF
O2_SENSE+
SH2
NEWO2_SENSE+
SH2
MTG3
MTG2
10%
25V
10UF
C29
1/8W
47.5
1%
100PPM
R11
PRES_PAT
SH1
U7
AD822AR
ZJK5103-05
FL3
E2_POWER
SH1
REM_ON+
O2_FLUSH+
P2
SIGNAL=CHAS_GND;51,52
MT2MT1
12
+12V
9
8
7
6
1
2
3
4
5
VSET
VOUTVIN
SHDN
LBO
LBI
GND
DD
4
6
1
7
2
3
5
8
IN12
IN11
IN10
IN9
IN8
V+
IN14
IN13
V-
IN7
IN6
IN5
IN4
IN3
IN2
IN1
13
12
11
10
9
16
15
14
8
7
6
5
4
3
2
1
+12V
2
1
+15V
+5V
+15V +12V
+12V
+12V
+12V
VSET
VOUTVIN
SHDN
LBO
LBI
GND
DD
8
5
3
2
7
1
6
4
+SIGNAL
-SIGNAL
10V-FORCE
2V-SENSE
2VFS 4MA 4MAADJ
ALARM
BOOST
BW-ADJ
COM
FEEDBACK IOUT
VOS1 VOS2
VS
6
7
12
10
11
9541615
8
1
3
2
14 13
+SIGNAL
-SIGNAL
10V-FORCE
2V-SENSE
2VFS 4MA 4MAADJ
ALARM
BOOST
BW-ADJ
COM
FEEDBACK IOUT
VOS1 VOS2
VS
1314
2
3
1
8
15 16 4 5 9
11
10
12
7
6
COM
OUT
EXC
1
2
3
1
2
3
4
8
23
14
1
26
50
39
38
42
43
49
48
47
44
45
46
34
33
32
35
36
37
31
30
29
11
12
13
17
18
19
20
21
22
23
24
25
4
5
6
7
8
9
10
3
28
14
40
16
41
15
27
2
CONNECT SHELL TO CHAS_GND
REM_ON-
DCGO-
(INSP)
REM ON SW
DCGO SW
SWITCH RETURN
SWITCH RETURN
SWITCH RETURN
NET CONNECTED TO ANALOG GND
NEAR AD694 PIN 5
20.9%-0.315 to 0.525 V
24 Deg. C, O2-100%
2.50 V MAX OUTPUT
2.531 V AT F.S.
(EXP)
Output = 0.621 V
0.388 v AT ZERO
Output = 4.050 V at full scale
24 deg. C, zero pressure
Output = 1.90 to 4.00 V
NET CONNECTED TO ANALOG GND
NEAR AD694 PIN 5
NET CONNECTED TO ANALOG
GND NEAR AD822 AND 88.7K
O2 FLUSH SW
LO_O2_PRES-
G = 21
O2_FLUSH-
CONNECT SHELL TO CHAS_GND