Welch Allyn Atlas Service Manual page 134

A
U601 U602 U603 U608
fVcc
C622 + C609 C623 C624
.047uF 4.7uF .047uF .047uF
E E E E E
U601 U602 U603 U608
fVee
C625 C614 C626 C627
.047uF 4.7uF .047uF .047uF
4
E E E E E
fVcc
3
5
Resp-DC +
7
6
-
U601B
MC34072
fVee
U601-7 Temperature
Amplifier
fVcc
TP620
R624
51.1K
U608-3
3
f+1.24V
+
1
C633 U608-2
2
-
.01uF
U608A
AD712
E
fVee
TP623
R625
-Clamp +Clamp
1K
D602 R627
BAV99L
1 2
0.1%
2
C635 .01uF
J601
Temp-In
2
1
Temperature C636
CON2 2200pF
Thermistor
E
1
A
B
U609
fVcc
C637 C639
.047uF .047uF
R623
46.4K fVcc
TP604
E
5
+
U609
7
Resp-Reset
6
-
U607B
LM393
TP601
C638 C640
.047uF .047uF
fVee
fVcc
E
fVcc
R622
46.4K
3
+
1
Sw-MonBw
2
-
U607A
LM393
TP609
fVee
fVcc
5
+
7
SW-RLD-V
6
f+1.24V
-
AD712
U608B
fVee
TP616
C630
f+5V 4.7uF
f+5V
E
TP615 TP635
13 12
U604F
74HCT04
E
Resp-LdsOff
An-Resp
TP621
R626
1K
U608-1 Patient-Temp
MuxA
TP624
C634 .01uF
vRL
f+1.24V
RA
LA
LL
V+
1.21K
An-ECG
TP627
R601 fVcc
10K
U601-3
f+5V
R602 3
+
73.2K
2
-
f+5V
TP631
R603
E
46.4K
U601-2
C601 fVee
U604-10
11 10
R604 1000pF
10K
U604E D601-2
2 1
74HCT04
E
D601
TP633
MMBD1503A
52uSec
Integrator
Input
833uSec
(U604-10)
+5V
Comparator
Inputs
Analog In
-5V
PWM-Out
(U602-7)
PWM-timer
B
C
TP603
U605 U606
iso+5Vdig
Resp-Off
SpO2-Reset
C629
.047uF
D E D
iso+5Vdig
TP605
Serial/Parallel
Control Data
U605
74HCT595
TP606 TP607
15 14
QA SER
1
QB
Sw-RespReset
2 11
QC SRCLK
SW-RL-V 3 10
QD SRCLR
MuxB
4
QE
MonBw
5 12
QF RCLK
6 13
SW-RLD-RL QG G
7
SW-RLD-LL QH
9
QH
TP610 TP611
TP612
D E
U605-out
TP613 TP614
U606
74HCT595
15 14
TP617 TP618 SW-RLD-LA QA SER
1
SW-RLD-RA
QB
2 11
Mux-LdS-C QC SRCLK
3 10
Mux-LdS-B QD SRCLR
4
Mux-LdS-A
QE
Mux-A/D-C 5 12
QF RCLK
Mux-A/D-B
6 13
QG G
Mux-A/D-A 7
QH
fVee
9
QH
9
C
10
B D E
11
A
6
INH
U609
4051
4
X7
MuxB
2
X6
5
X5
1
X4
12
X3
15 TP642
X2
14
X1
A/D Mux
13 3
X0 X
fVcc
fVee
9
C
10
B
11
A
6
INH
U603
4051
4
X7
MuxA
2
X6
5
X5
1
X4
12
X3
15 R605 R607
X2
3.48K 464K
14
X1
13 3
X0 X
iso+5Vdig
TP626 fVcc
E TP625
fVcc
C603
680pF
2
+
7
U601-1 U602-3
1 3
-
U602
R606 LM311
TP629
U601A 3.48K
TP630
MC34072
PWM
fVee
E
A/D
Converter
C
D
C631
.047uF
iso+5Vdig
E
C641
TP639
f+5V R613 0.1uF
6.19K
TP638
U604A
74HCT04 R628
D E
10K
U604-2 2 1 U613-6
TP636 C643
220pF
E
D E
iso+5Vdig
C642
TP640
0.1uF
f+5V R615
U604B 6.19K
74HCT04 R629
D E
10K
U604-4 4 3 U612-6
C644
TP637 220pF
E
D E
U605-12
C646
1000pF iso+5Vdig
E
R630 C628
TP641
10K 0.1uF
f+5V R617
U604C 2.15K
74HCT04 R631
D E
5.11K
U604-6 U611-6
6 5
C645
100pF
E
D E
iso+5Vdig
f+5V
R608
1K
TP628
9 8 1 Q601
MMBT3904L
U604D
74HCT04
R610
E
511
TP632
Initial
Drawn
Rick Myers
Designed
Rick Myers
Checked
L. Phillips
Approved
Z. Psenicnik
Release For Production
J. Bello
D
E
REV Description ECN/ECO Init Date
A Release to Production 5-39121 JAC 3/15/99
B See ECN worksheet 5-39455 LPP 4/27/99
Improvements for ESD, RFI,
D and Fast Transients, Correct 5-39821 LPP 6/24/99
Respiration Diff-Amp Topology
Mods to U2 clock line, Resp
E gain amp, ECG supply and 5-39936 LPP 7/9/99
NVRAM pullup
Isolation
Barrier
+5V
U613
HCNW4503
8 2
R619
6 619
iso604-a
3
FE-Data-In
5
D E
+5V
U612
HCNW4503
8 2
R620
6 619
iso603-a
3
FE-Data-Clock
5
D E
+5V
U611
HCNW4503
8 2
R621
215
6
iso602-a
3
FE-ADC-Clock
5
D E
C632
.047uF
+5V
E
C621
0.1uF
U610 R611
HCNW4503 6.19K
iso601-a TP643
2 8
R632
5.11K
U610-6
6
FE-PWM-ADC
3
5
C647
D E
100pF
Welch Allyn Inc.
Date
Schematic: 620017.dsn
Mar 5, 1999
Mar 5, 1999
Title
ECG A/D and Interface
3/16/99
Size
Document Number
3/16/99
C 620017
3/16/99
Date: Wednesday, July 14, 1999 Sheet 6 of 8
E
Ckd
LPP
LPP
LPP
4
3
2
1
Rev
E