Welch Allyn Atlas Service Manual page 121

A
4
Place capacitors
by connector
VCC VCC
C9 C27
+ +
4.7uF 4.7uF
VCC
J1
Key-Clock
1 2
3 Key-Latch-n
3 4
Key-Data
5 6
LED-Data
7 8
LED-Enable
9 10
11 12
LED-Latch-n
13 14
R51
316 HEADER 7X2
R1
On-Led
2.2K
D13
T1 (3mm) Green
On/Standby
VCC
R2
2.15K
U1D
U1A
9 8
1
74HC04
74HC04
U1E
U1B
11 10
3
2
74HC04
74HC04
U1F U1C
13 12 5
74HC04 74HC04
VCC VCC VCC VCC VCC
+ C1 + C8 + C10 + C11 + C28
4.7uF 4.7uF 4.7uF 4.7uF 4.7uF
VCC VCC VCC VCC VCC
C2 C3 C4 C5 C6
0.1uF 0.1uF 0.1uF 0.1uF 0.1uF
1
VCC VCC VCC VCC VCC
C16 C17 C18 C19 C20
0.1uF 0.1uF 0.1uF 0.1uF 0.1uF
A
B
ACON-LED
On/Off-sw
Key-data-b
TP182
R71
100
U26
2 18 u26-18
1A1 1Y1
4 16 Key-Latch-b
1A2 1Y2
6 14
1A3 1Y3
8 12 LED-Data-b
1A4 1Y4
11 9 u26-9
2A1 2Y1
u26-7
13 7
2A2 2Y2
15 5 LED-Latch-1
2A3 2Y3
LED-Latch-2
17 3
2A4 2Y4
1
1G
19
2G
74HC244
TP183 R72
100
LED_TP_enable TP2
2
LED_NIBP_enable TP3 TP184 R73
4
100
LED_SPO2_enable TP4
6
Place one tantalum
cap near each seven
segment LED group
VCC VCC VCC VCC VCC
C7 C12 C13 C14 C15
0.1uF 0.1uF 0.1uF 0.1uF 0.1uF
Place one
ceramic cap
near each
VCC VCC VCC VCC VCC VCC
IC
C21 C22 C23 C24 C25 C26
0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF
B
C
Keyboard Circuits
On/Off-sw Trend
Clock1 Trend
Key-Clock-b Lead-Select
Lead-Select
Print
Key-Latch-b Print
Key-Data-b
Silence-Switch
Front Panel - A
I705144
LED_TP_Enable
LED_TP_Data_In
Clock2
LED_TP_Clock
LED_TP_Latch
LED_TP_Data_Out
Front Panel - B
u19-out
NIBP LED Circuits
Silence-LED
LED_NIBP_Enable Silence-LED
Silence-Switch
LED_NIBP_Data_In
Clock3
LED_NIBP_Clock
LED_NIBP_Latch
LED_NIBP_Data_Out
Front Panel - C
u13-out
I705124
LED_SpO2_Enable
LED_SpO2_Data_In
LED_SpO2_Clock
LED_SpO2_Latch
Front Panel - D
9
10
1
Pull-up Resistor Network Detail
C
D
Break-Away PCB Section
Flag Pole Area
Trend-sw
Lead-Select-sw
Print-sw
J2A
J2xA
1 1
2 2
3 3
AC-On-x
4 4
5 5
flex-cable-5 flex-cable-5
FP-Common
Silence Button
Break-Away PCB
Section
D10-Vcc
VCC D10-C
J3A
J3xA
1 1
2 2
Sil-Sw-a
3 3
4 4
5 5
Sil-Sw-b
flex-cable-5 flex-cable-5
8 7 6
5
Initial Date
Drawn
Jim Belesiu 3/15/99
2 3 4 Designed
Jim Belesiu 3/15/99
Checked
L. Phillips 3/24/99
Approved
Z. Psenicnik 3/24/99
Release For Production
J. Bello 3/24/99
D
E
REV Description ECN/ECO Init Date Ckd
A Release to Production 5-39251 3/23/99 LPP
JAC
B No Load D16 5-39485 LPP 4/28/99 LPP
C D13 to Low Profile, R51 to 316 5-39994 LPP 7/23/99
4
SW9
Trend
2 1
SW11
Lead Select
2 1
SW13
Print
2 1
R65 1.21K
1 2
5x5 Green
D1
ACLED-1
1 2 1 2
R66 1.21K
AC On LEDs
1 2 ACLED-2 1 2
R67 1.21K D2
1 2 5x5 Green
R68 1.21K
3
D10
2 1
T1 (3mm) Red
Silence LED
SW22
2
1 2
Silence
Switch
1 2
SW28
1
Welch Allyn Inc.
Schematic:
Title
Front Panel Display Board
Size Rev
Document Number
620008 C
C
Date: Friday, July 23, 1999 Sheet 1 of 5
E