Welch Allyn Atlas Service Manual page 114

A
U601 U602
fVcc
C622 + C609 C623
.047uF 4.7uF .047uF
E E E
4
U601 U602 U603
fVee
C625 C614 C626 C627
.047uF 4.7uF .047uF .047uF
E E E E
U604
f+5V
+ C631
4.7uF
E
3
2
f+5V
TP630
11 10 U604-10
fVcc
U604E
74HCT04
TP620
E
5
+
7
6
-
E
U601B
MC34072
fVee
U601-7
f+5V
13 12
U604F
74HCT04
1
E E
A
B
U603
C624
.047uF
E
fVcc
fVcc
R623
46.4K
5 SW-RL-V
+
7
Sw-RLD-V
6
f+1.24V
-
U607B
LM393
fVee
fVcc
fVcc
R622 TP601
46.4K
3
+
1
Sw-MonBw Sw-RLD-RL
2
- f+1.24V Sw-RLD-LL
U607A
LM393
TP604
fVee
Sw-RLD-LA
Sw-RLD-RA
Mux-LdS-C
Mux-LdS-B
Mux-LdS-A
TP607
9
C
TP608 10
B
11
A
TP609
6
INH
4
vRL X7
2
f+1.24V X6
5
RA X5
1
LA
X4
12
LL X3
15
V+ X2
14
An-ECG
X1
13
X0
E
TP614 fVcc
R601 fVcc
10K
U601-3
f+5V
R602 3
+
73.2K U601-1
1
2
-
U601A
TP617 R603 MC34072
E
46.4K
U601-2
C601 fVee
PWM
TP619
A/D
R604 1000pF
10K Converter
D601-2 2 1
D601
MMBD1503A
52uSec
Integrator
Input
781uSec
(U604-10)
+5V
Comparator
Inputs
Analog In
-5V
PWM-Out
(U604-8)
PWM-timer
B
C
TP625
iso+5Vdig
iso+5Vdig
C629
.047uF
Serial/Parallel
Control Data
D E
TP602
U605
74HCT595
U604-2
15 14
QA SER
1
QB
2 11
QC SRCLK
3 10
QD SRCLR
4
QE
Sw-DiagBw
5 12
QF RCLK
6 13 TP603
QG G
7
QH
9
QH
TP621 TP622
TP605
D E
U605-out
TP623 TP624
U606
74HCT595
15 14
QA SER
1
QB
U604-4
2 11
QC SRCLK
3 10
QD SRCLR
4
QE
Mux-A/D-C
5 12
QF RCLK
Mux-A/D-B 6 13
QG G
Mux-A/D-A
7
QH
U605-12 TP606
9
QH
C637
fVee
1000pF
R628
D E
10K
D E
A/D Mux
U603
4051 U604-6
TP610 TP611 TP612
R605 R607
3.48K 464K
3
X
iso+5Vdig
fVcc
TP613
f+5V
R608
C603 1K
680pF
TP616 2
+
7 9
U602-3
3
-
U602
R606 LM311
3.48K
fVee
E
C
D
Isolation
Barrier
iso+5Vdig
TP627 R613 C641
f+5V 6.19K 0.1uF
U604A 8
74HCT04 R625
D E
10K
U613-6
2 1 6
5
C634
220pF
E D E
D E
iso+5Vdig
TP628 R615 C642
f+5V 6.19K 0.1uF
U604B
8
74HCT04 R626
D E
10K
U612-6
4 3 6
5
C635
220pF
E D E
iso+5Vdig
D E
C628
TP629 R617 0.1uF
f+5V 2.15K
U604C
8
74HCT04 R627
D E
5.11K
U611-6
6 5 6
5
C636
100pF
E D E
D E
iso+5Vdig
C632
TP615 .047uF
8 1 Q601
E
MMBT3904L
U604D
74HCT04
R610
E
511
iso601-a 2
TP618
3
D E
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 JAC 3/15/99
5-39118
B See ECN worksheet 5-39456 LPP 4/27/99
Improvements for ESD
C 5-39822 LPP 6/23/99
and Fast Transients
Mods to U2 clock line,
D 5-39934 LPP 7/9/99
NVRAM pullup
+5V
U613
HCNW4503
2
R619
619
iso604-a
3
FE-Data-In
+5V
U612
HCNW4503
2
R620
619
iso603-a
3
FE-Data-Clock
U611 +5V
HCNW4503
2
R621
215
3 iso602-a
FE-ADC-Clock
+5V
R611 C621
6.19K 0.1uF
U610
HCNW4503
8
TP626
R624
6 U610-6
FE-PWM-ADC
5.11K
5
C633
100pF
Welch Allyn Inc.
Date
Schematic: 620002.dsn
Mar 5, 1999
Mar 5, 1999
Title
ECG A/D and Interface
3/16/99
Size Rev
Document Number
3/16/99
C 620002
3/17/99
Date: Friday, July 09, 1999 Sheet 6 of 6
E
Ckd
LPP
LPP
LPP
4
3
2
1
D