Welch Allyn Atlas Service Manual page 46

Section 3 - Troubleshooting
3.4 Diagnostic Tests
Button 1
Button 2
20 WELCH ALLYN ATLAS MONITOR
If distorted display on CRT:
Check connections:
CRT to Yoke cable
CRT to Anode cable
CRT to Deflection board
Deflection board to Main board cable
Replace Deflection board
Replace CRT
If good display but some items are distorted or missing
from CRT display:
If ECG waveform, heart rate, lead selected, heart
symbol missing:
Replace Main board
Press <DATE/TIME><LEAD SELECT>
Get Service Mode menu
Press <Select> to highlight Button test
Press <BP START/CANCEL> to start test
Press every button on system, <BP START/CANCEL> last
Verify that buttons match up with their names, and that all
buttons are functional.
If a button does not report its name, goto Button 2
If a button reports the WRONG name, goto NVRAM
1
Press <Trend> to return to Idle screen
If a single button does not report its name: Replace Dis-
play board
If multiple or all buttons do not report their names:
Check Display board to main board cable
Replace Display board
Re-install software
Replace CPU board
Replace Main board
SERVICE MANUAL 6200-43E REV. A