Welch Allyn Atlas Service Manual page 112

A
iso+5Vdig
C403 C406 + C415 +
.047uF 100uF 1uF
S S S
4
fVcc
TP407
R415
100
U401-7 7
f+5V
U401B
C416 MC34072
.047uF
C417
S
680pf
TP411
3
SpO2 ESD
J403
Ground
1
2
Tab-.187
S
J401
fVcc
1
2
sSpO2tx
3
+ C419
4
10uF
CON4
S
2
1
A
B
U403
LP2951C
1 8
VOUT VIN
5 7 U403-7
ERR FDBK
3
SHTDN
TP401
6 C401
TAP
.047uF
2
SENS
S
S
fVcc
C402
.047uF
TP405
R416
10K
5 U401-5
iso+5Vdig
+
6
-
+ C418
4.7uF fVee
S
C404
S
.047uF
R417
10K
TP419
R418
5.11K
S
TP421
R401
10K
iso+5Vdig
S
B
C
Isolation
Barrier
Isolated SpO2
Circuits
D401
T401-1
C405 + MBRS130T3 T401
100uF R419
215
1
TP403
S S
C421-1
C421 2
470pf
3
D403
T401-4
4
C407 MBRS130T3 IsoXfmr
100uF
S S
D E E S
fVcc
TP420 U410
R403 4N25
U401-3 3 1K
+
U401-1 iso401-a
1 1
U401-2
2
-
U401A
MC34072
2
S S
TP422
C408 R402
.01uf 10K
C408-2
iso+5Vdig
R420
9.09K
C413
.047uF
D E
Q403
sSpO2tx MMBT3904L
1
U411
R412 HCNW4503
511
TP423
Q403-e iso402-a 2
3
D E
C
D
filt+12V
Grounded SpO2
Circuits
+ C412
10uF
C409
470pf
+12V
C409-1
TP402
R405
5
215
C414
.047uF
TP406
8 T401-8
TP408
D405
BAV99L TP409
R407
Q401 10
MTD3055V U402-e
1 2 1
R409
Q402 1 5.11K
MMBT3906L U402-sen
R406
0.2
TP414 R408 TP416 C410
TP415
100 .01uF
TP417
Q401-s
+5V
R411
iso401-b 5.11K
6
5 opto-fb
4
R404
316K
+5V
R414
TP424
8 6.19K
R421
10K
6 u411-6
SpO2Out
5
C422 C423
.047uF 1000pF
Initial Date
Drawn
Rick Myers Mar 5, 1999
Designed
Rick Myers Mar 5, 1999
Checked
L.Phillips 3/16/99
Approved
Z. Psenicnik 3/16/99
Release For Production
J. Bello 3/17/99
D
E
REV Description ECN/ECO Init Date Ckd
A Release to Production JAC 3/15/99 LPP
5-39118
B See ECN worksheet 5-39456 LPP 4/27/99 LPP
Improvements for ESD
C 5-39822 LPP 6/23/99 LPP
and Fast Transients
Mods to U2 clock line,
D 5-39934 LPP 7/9/99
NVRAM pullup
4
TP404
U402-ref
U402 C420
16 .047uF
VREF
10
SHTDWN
12
CA
11 3
EA OSCOUT FE-Pwr-Sync
U402-rt
13 6
CB RT
14 7 U402-ct
EB CT
2
V+
4 1 TP412 TP413
+SENSE V-
5 9
-SENSE COMP
LM3524DM
C411 R410
2200pF 10K 3
2
1
Welch Allyn Inc.
Schematic: 620002.dsn
Title
Power Iso and SpO2 interface
Size Rev
Document Number
D
C 620002
Date: Friday, July 09, 1999 Sheet 4 of 6
E