Datex-Ohmeda 7900 Service Manual page 177

8 /Schematics
+15V_SIB
CR24
SMBJ16A
P1
TO SIB BOARD
1
26 AGND
2
27 AGND
3 +15V_SIB
28 AGND
4 +15V_SIB
29 AGND
5 +15V_SIB
30 AGND
6 +15V_SIB
31 AGND
7
32 AGND
8 PRES_PAT
33 PAT_RET
9 PRES_INSP
34 INSP_RET
10 PRES_EXP
35 EXP_RET
11 O2
36 O2_RET
12 AGND
37 AGND
13 O2_FLUSH+
38 O2_FLUSH-
14 DCGO+
39 DCGO-
15 BAG_VENT+
40 BAG_VENT-
16 REM_ON+
41 REM_ON-
17 SW_RET
42 SW1
18 SW2
43 SW3
19
44 SCLK_PLUS
20 SCLK_MINUS
45 SDA1_INSP
21 SDA2_EXP
46 E2_POWER
22
47 SSW4+
23 SSW4-
48 LO_O2_PRES+
24 LO_O2_PRES-
49
25
50
SIGNAL=CHAS_GND;51,52
REM_ON+
SH2
REM_ON-
NC
Figure 8-20
Power supply board schematic diagram, page 4 of 5
AGND
CR22
+15V
SMBJ16A
C85
0.1UF
10%
50V
U11
1 16
IN1 V+
2 15
IN2 IN14
3 14
IN3 IN13
4 13
IN4 IN12
5 12
IN5 IN11
6 11
IN6 IN10
7 10
IN7 IN9
8 9
V- IN8
SP720
VDD
CR5
SMBJ6.0A
C74
0.1UF
10%
50V
U8
1 16
IN1 V+
2 15
IN2 IN14
3 14
IN3 IN13
4 13
IN4 IN12
5 12
IN5 IN11
6 11
IN6 IN10
7 10
IN7 IN9
8 9
V- IN8
SP720
VDD
CR25
SMBJ6.0A
C87
0.1UF
10%
50V
VDD VDD VDD VDD VDD VDD VDD VDD
R11 R10 R13 R12 R4 R3 R8 R2
1.00K 1.00K 1.00K 1.00K 1.00K 1.00K 1.00K 1.00K
1% 1%
1% 1% 1% 1% 1% 1%
1/8W 1/8W 1/8W 1/8W 1/8W 1/8W 1/8W 1/8W
R49
47.5K
R51
1%
47.5K
1/8W
R52
47.5K 1%
1/8W
R53
47.5K 1%
1/8W
R70
1%
47.5K
1/8W
R68
1%
47.5K
1/8W
R69
1%
47.5K
1/8W
1%
1/8W
C65 C64 C67 C66 C62 C61
0.1UF 0.1UF 0.1UF 0.1UF 0.1UF 0.1UF
10% 10% 10% 10% 10% 10%
50V
50V 50V 50V 50V 50V
VDD VDD
C60 C63
0.1UF 0.1UF
10% 10%
50V
50V
7900 Ventilator- 1503-0151-000 1-97
PRES_PAT
PAT_RET
PRES_INSP
INSP_RET
PRES_EXP
EXP_RET
O2
O2_RET
SIB_PWR
SH5
V_BATT
SH3
I_BATT
SH3
U13 LO_O2_SW
1 16
IN1 V+
EXT_SW4
2 15
IN2 IN14
O2_FLUSH_SW
3 14
IN3 IN13 DCGO_SW
4 13
IN4 IN12 BAG_VENT_SW
5 12
IN5 IN11 EXT_SW1
6 11
IN6 IN10
EXT_SW2
7 10
IN7 IN9
EXT_SW3
8 9
V- IN8
MAIN_POWER_ON
SP720
SH1
CHG_DISABLE
SH1
TXDA
SH3
RXDA
SH3
TXDB
SH3
U3
RXDB
SH3
3 4
AC_LED_A
SH1
AC_LED_C
74HC14
U3
DGND
1 2
SCLK_PLUS
R50 SCLK_MINUS
47.5K 74HC14
DGND
U4
SDA1_INSP
1%
1 2
1/8W
DGND
SDA2_EXP
74HC14
DGND
U4 E2_POWER
3 4 DGND
74HC14
U4 GIVON_RR
NC
5 6 DGND
XRESET
NC
74HC14 DGND
U4 XIRQ6
NC
9 8 DGND
CONTROL_IACK6
NC
C59 C58 74HC14 DGND
0.1UF 0.1UF
U4 XDOUT7
10% 10%
NC
50V 50V
11 10 XDOUT6
NC
XDOUT5
NC
74HC14 XDOUT4
NC
U4 XDOUT3
NC
13 12 XDOUT2
NC
XDOUT1
NC
74HC14 XDOUT0
NC
TO MICRO BOARD
J2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
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60
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