Datex-Ohmeda 7900 Service Manual page 163

8 /Schematics
R16
47.5
1/8W
1%
C8
1500PF
C13
5%
1500PF
50V
5%
50V
R18
422
1%
1/8W
C15
1500PF
5%
NET CONNECTED TO ANALOG GND
50V
NEAR U12 (AD820) PINS 3 & 4
CR2
SMBJ6.0A
U2
1
IN1
2
IN2
3
IN3
4
IN4
SDA1_INSP 5
SH1,2 IN5
6
IN6
7
IN7
8
V-
SP720
E5
E4
E1
E3
P1
8 CLOCK
15 INSP DATA
7 SWITCHED +5V
14 DIGITAL GND
6 TEMP COMP
13 SENSOR A
5 SENSOR B
12 ANALOG GND
4 CLOCK
11 EXP DATA
3 SWITCHED +5V
10 DIGITAL GND
2
9
1
MTG1
E2
O2_SENSE-
CHAS_GND;16,17
CONNECT SHELL TO CHAS_GND
Figure 8-6
7900 SIB schematic diagram, page 2 of 2
+12V
C37
0.01UF
10%
50V
7
3
4
J2
6
1
2
2
3
U9
C30
AD820AR
R15 0.1UF
1.5K 10%
R34
1%
50V
30.1K
1/8W
1%
1/8W
NEWO2+
C31
O2_SENSE+
0.1UF
10%
50V
R33
1.18K
1%
+5V
1/8W 5
7
6
U7
16
AD822AR
V+
15 SCLK_PLUS
IN14 SH1,2
14
IN13
13 SCLK_MINUS
IN12 SH1,2
12
IN11
11 SDA2_EXP
IN10 SH1,2
10
IN9
9
IN8
PLACE NEXT TO CONN. P1
FL2
ZJK5103-05
PLACE NEXT TO CONN. P1
1 4
2 3
R1
4.99K
1%
1/8W
R6
1.5K
TP3
1%
1/8W
C4
100PF
5%
R5
50V
1.5K
1%
R7
1/8W
C3 4.99K
1%
100PF
5% 1/8W
50V
TP1
R2
200
SDA1_INSP
(INSP)
1%
1/8W
C2
100PF
TP11
5%
R8
50V
200
SDA2_EXP
(EXP)
1%
1/8W
FL1
ZJK5103-05
C7
1500PF
5% 1 4 NEWO2_SENSE+
SH1
50V
SH1
2 3
CR1
SMBJ6.0A
6V
JOINED NEAR 50 PIN CONNECTOR
2.000 V
R14
130
+15V
1%
C40
1/8W
0.1UF
SH1
SH1 10%
Zero Pres. 1.481V
50V
R13
8.87K U11
TP10
0.1% 1 265100-OHMEDA
1/8W
EXC
2
OUT
COM
C25 R25 R36 C19
3 0.01UF
0.1UF 1.00K 11.0K
10%
10% 0.1% 1%
50V 1/8W 1/8W 50V
0.200 V Offset
TP17
TP9
+15V
C41
0.1UF
10%
50V
Zero Pres. 1.481V
U10
TP18
1 265100-OHMEDA
EXC
+5V
2
OUT
COM
C35
3 R35 0.01UF
C1
11.0K 10%
0.1UF
SH1,2 1% 50V
1/8W
10%
50V
R3
4.99K
1%
TP2
SH1,2
1/8W U1
1 MAX488CSA
C5
100PF
5% VCC 8 SCLK_PLUS
SH1,2
50V 2
7
5
R4
3
475
6
1%
GND
1/8W
4
TP4
SCLK_MINUS
SH1,2
+12V
C18
0.1UF
C20
10%
0.1UF
50V
10%
50V
14 13
BW-ADJ VS
7
10V-FORCE
12
BOOST
8 2.050 V at 24 deg. C
2V-SENSE
U5 Q2
1 11
FEEDBACK IOUT
MJD3055
AD694BR
2 10
-SIGNAL ALARM
3
+SIGNAL
VOS1 VOS2 2VFS COM 4MA 4MAADJ
15 16 4 5 9 6
200 mV
NET CONNECTED TO ANALOG GND
NEAR AD694 PIN 5
+12V
C38
0.1UF
C39 10%
50V
0.1UF
10%
50V
14 13
BW-ADJ
VS
7
10V-FORCE
12
BOOST
8 2.050 V at 24 deg. C
2V-SENSE
Zero Pres.
Q4
U12
1 11
FEEDBACK IOUT
MJD3055
AD694BR
2 10
-SIGNAL ALARM
3
+SIGNAL
VOS1 VOS2 2VFS COM 4MA 4MAADJ
C33
0.01UF
15 16 4 5 9 6
10%
50V
NET CONNECTED TO ANALOG GND
NEAR AD694 PIN 5
7900 Ventilator- 1503-0151-000 1-97
Zero Pres.
TP13
PRES_EXP
SH1
C17
0.01UF
10%
50V
EXP_RET
SH1
TP19
PRES_INSP
SH1
INSP_RET
SH1
8-7