A
A
B
B
C
C
D
D
E
E
4 4
3 3
2 2
1 1
Front Panel
Display Connector
Main PCA
Connector
Recorder Board
Connector
CRT Board
Connector
EKG - Page6
Speaker Drive
Serial
Data
Out
4Vpp max.
NIBP - Page 2
SpO2 - Page4
EKG - Page4
To PIC
CO2 Board
Connector
Serial IO - Page8
Page1
(Front Panel Key)
(To Processor)
(To U2)
(pg 3)
(pg 1)
Fan
Connector
620017.dsn
Rick Myers
Rick Myers
Mar 5, 1999
Mar 5, 1999
5-39121 JAC 3/15/99
L. Phillips
LPP
Z. Psenicnik
J. Bello
3/16/99
3/16/99
3/16/99
B See ECN worksheet
Recorder
ESD Ground
D
Improvements for ESD, RFI,and
Fast Transients, Correct
Respiration Diff-Amp Topology
5-39455 LPP LPP4/27/99
5-39821 LPP 6/24/99
E
Mods to U2 clock line, Resp gain
amp, ECG supply, and NVRAM
pullup
Jumper wire
from J4-20 to
J4-55
5-39936 LPP 7/9/99
LPP
620017 E
Main Board - Model 220
C
18Tuesday, July 13, 1999
Title
Size
Document Number
Rev
Date: Sheet of
Welch Allyn Inc.
Schematic:
Release For Production
Approved
Checked
Designed
Drawn
Initial Date
REV
Description
ECN/ECO Init
Date Ckd
A Release to Production
Key-Data
U7-wc
SPI-Data-Out
Spare-3
NIBP-15mmHg
NIBP-Data
Spare-2
SCL
Video-Data
SCD
SPO2-Tx
LED-Data-b
NIBP-Safety
Video-Data
HRESET
NIBP-OP
Video-VSync
Video-HSync
Video-VSync
Video-HSync
Speaker-Audio
SPI-data-in
SPO2-Rx
SPO2-Rx
NIBP-PWM-ADC
NIBP-Valve-Close
Vbackup
RS232-CTS
EROM-wr
ETCO2-Tx
FE-Clock
EKG-Data-Clock
PIC-Data
LED-Latch-b
LED-Latch
Key-Latch-n
ETCO2-Rx
RS423-Rx
RS423-Tx
Nurse-Call
Batt-ID
q2-c
Q1-e
+3.3V
Q2-b
ACON-LED
PIC-audio
NIBP-Offset-DAC
NIBP2-PW-ADC
LED-Data
Key-Latch-n-b
LED-On
LED-On
PIC-Clk
uP-RESET
SPI-Clock
Key-clock
Key-Clock-b
Rec-Clock
Rec-Motor-Step
Rec-Clock
Rec-Data-Latch Rec-Strobe
Rec-Data-Latch
Rec-Strobe
PIC-Vprog
Rec-Data
Rec-Motor-Step
Rec-Supply-On
Audio-Shutdown
SMR17-1
U9-4
SP
U9-3
Audio-Shutdown
EKG-ADC-Clock
Power-Sync
ADC-Clock
EKG-PWM-ADC
Power-Sync
FE-Data
FE-Data
Vbackup
FE-Data-Clock
FE-ADC-Clock
FE-Data-In
+12V
NIBP-15mmHg
NIBP-Safety
NIBP-PWM-ADC
NIBP-Offset-DAC
NIBP-ADC-Clock
NIBP-Overpressure
NIBP-A/D-SelA
SpO2Out
NIBP-Valve-Close
NIBP-Pump-On
NIBP-A/D-SelB
NIBP-A/D-SelC
FE-Pwr-Sync
On/Off-Key
ac-on
+3.3V
U2-Reset
PIC-Data
RS423Rx
RS423Tx
NurseCall
AC+12V
Rec-GND
Battery
+3.3V
ac-on
AC+12V-fuse
ACON
+12V
Rec+DCV
Rec-GND
Rec-GND
Rec+DCV
Rec-GND
+12V
PIC-Clk
U2-Reset
PIC-Data
HRESET
Vbackup
On/Off
Batt-ID
On/Off-Key
Print-Temp
+5V
Rec-Supply-On
Rec+DCV
FE-PWM-ADC
+5V
+3.3V
+5V
D
D
D
D
D D
D
D
D
D
DD
D
D
D
D
D
D
+5V
D
+5V
D
+5V
DD
+5V
DD
DD
+5V
A D
+3.3V
D
DD
+5V
+5V
D
D
+5V
+3.3V +5V
+5V
+5V
D
D
D
D
+5V
D
+5V
+12V
+5V
D
D
+5V
D
D
+5V
+5V
+5V
J1
CON7
1
2
3
4
5
6
7
C3
220pF
J9
Tab-.187
1
2
U1B
74HCT04
3 4
147
U8F
74HCT04
13 12
147
C37
0.1uF
U1C
74HCT04
56
147
TP14
TP13
TP15
+
C7
330uF
U8C
74HCT04
5 6
147
+
-
U9
TPA301
3
4
1
67
2
8
5
C8
.047uF
TP12
J4
Socket 30x2
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
51
53
55
57
59
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
51
53
55
57
59
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
U8A
74HCT04
12
147
R2
1.96K
TP18
R19
19.6K
R4
10K
U3D
74HCT08
12
13
11
147
J8
CON14AP
1
3
5
7
9
11
13
2
4
6
8
10
12
14
+
+
+
+
+
+
+
+
+
+
+
+
+
+
U2
74HCT595
14
11
10
12
13
15
1
2
3
4
5
6
7
9
168
SER
SRCLK
SRCLR
RCLK
G
QA
QB
QC
QD
QE
QF
QG
QH
QH
VCCGND
R5
19.6K
+
C36
4.7uF
U3A
74HCT08
1
2
3
147
C22
.047uF
TP17
C39
.047uF
J6
CON6
1
2
3
4
5
6
J2
CON3
1
2
3
TP23
C1
.047uF
TP24
Q2
MMBT3904L
3
1
2
U1A
74HCT04
12
147
C20
.047uF
R15
1.96K
J5
CON2
1
2
TP16
C23
.047uF
C29
.047uF
R16
3.48K
U3B
74HCT08
4
5
6
147
TP19
Q3
2N7002
3
1
2
R21
10K
TP1
U8D
74HCT04
9 8
147
J11
CON3
1
2
3
TP2
TP22
R6
1.96K
TP20
TP3
R3
10K
TP21
TP4
R1
10K
U1F
74HCT04
13 12
147
J3
CON4
1
2
3
4
R20
10K
+
C41
1uF
TP26
C40
.047uF
Q1
MMBT3906L
3
1
2
+
C4
330uF
R22
10K
U8E
74HCT04
11 10
147
U1D
74HCT04
9 8
147
TP11
C14
.047uF
C5
.047uF
U10
D620361-MX10000
2
5
7
4
3
6
1
14
8
9
10
11
12
13
ClkIn/Osc1/RB5
TC5/TOCK1
RC3
Vpp/MCLR/RB3
Clkout/Osc2/RB4
RC4
Vdd
Vss
RC2
RC1
RC0
RB2
RB1
RB0
R23
1.21K
U3C
74HCT08
9
10
8
147
C42
.047uF
R24
1.21K
U1E
74HCT04
11 10
147
U8B
74HCT04
3 4
147
TP7
C38
220pF
C30
.047uF
TP9
TP5
U7
AT24C02N-10SC-2.7
1
2
3
6
7
5
84
A0
A1
A2
SCL
WC
SDA
VCCGND
TP25
TP10
J7
CON24A
1
3
5
7
9
11
13
15
17
19
21
23
2
4
6
8
10
12
14
16
18
20
22
24
TP6
+
C35
4.7uF
TP8
R25
1.21K
R17
19.6K
R18
1.21K
C2
.047uF
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