Mallinckrodt NELLCOR NPB-195 Service Manual page 85

VDD
L21 600R
+
C71
C75
1.0U
2200P
20V
50V
I237
U19
14 14 D1 2
PWR
D2 13
I97
I98
TXD 4 4
T1IN T1LDR
NURSE-CALL 5 5 T2LDR 6
T2IN
I99
RXD
9 9
R1OUT R1DIN
12 12
I88 R2OUT R2DIN
TP26
8 8
EN
EXCOM-SHTDWN 1 1 GND 7
SHDN
I192
MAX250S
R72
10.0K
035262
T2
SCHOTT 67129080
CLKDRV1 1 1 6 6
2 2
CLKDRV2 3 3 4 4
C89
L22 C117
3300P 3300P
600R
high power
50V 50V
clocks R74
4.02K
I238
8 8 TH
6 6
L23
2 2
600R
3 3 5 5
7 7
U18
6N136
2
13
3 3 TXDLDR
6 DTRLDR
10 10 RXDIN
11 11
7
U16
C76
4N26
Z5U
0.1U
VDD
R73
4.02K
U17
TH 8 8 6N136
6 6
2 2
5 5 3 3
7 7
+
C73
C72
1.0U
1.0U
+
20V
20V
CR12 TP29
1N914
3 3 1 1
TP31
U15
1 1 2 2 VPLUS
AC V+
DTR 3 3 13 13 VMINUS
T1DIN V-
TX 4 4
T2DIN
8 8
RTRI
I87
RXDLDR 5 5
R1LDR
6 6 9 9
I86 R2LDR R2IN
10 10 RXD232
R1IN
7 7
BYP
11 11
T2OUT
14 14 T1OUT 12 12
ISO_GND
MAX251S TXDOUT
+
C74
4.7U NCALOUT
IGND
35V
TP24
I
R76
100M
1/4W
TH
E
VPLUS
CR11
SMCJ22C
22V
VMINUS
CR16 CR13 CR14 CR15
BAV99 BAV99 BAV99 BAV99
I
IGND
DT1
600V
TH
SH1 BD MTG HOLE
Isolation Barrier EIA-232 Port Schematic Diagram
J2
16 16
1 1
9 9
2 2
10 10
3 3
11 11
4 4
12 12
5 5
13 13
6 6
14 14
7 7
15 15
8 8
17 17
CON_DB15F
Figure 11-7
11-19