Welch Allyn Atlas Service Manual page 51

Section 3 - Troubleshooting
ECG pulse tone, pulse volume control, saving set-
tings, <HR ALARMS Off> button
Connect ECG simulator with a normal ECG setting.
Should hear: heart rate beep, at constant high pitch.
If heart rate beep not heard, press SPO2 volume
button "+" three times
If heart rate beep still not heard:
If power-on beep was heard, isolate to
CPU/main board. Could also be display
board with a bad button.
Press SPO volume button "-" 8 times. Should get quieter
2
and finally silent.
If heart rate beep does not change volume: Replace
Display Board
Press <DATE/TIME><PRINT> or <DATE/TIME>
<FREEZE> to Save settings.
Turn system off and back on.
Heart rate beep should be silent even though heart rate is
displayed.
If heart rate beep is not silent on power up: goto
NVRAM3
Press SPO volume button "+" 8 times. Pulse tone should
2
get audible and then louder.
If heart rate beep does not change volume: Replace
Display Board hardware
Disconnect ECG cable
Should hear Technical alarm and see error message.
If alarm not heard:
Press <HR ALARMS Off> button.
Should stop Technical alarm sound, erase error message,
and light LED in <HR ALARMS OFF> button.
If alarm not silenced:
If error message not erased
If LED not lit:
Press <HR ALARMS OFF> button again.
Should hear Technical alarm sound, see error message,
LED unlit in <HR ALARMS Off> button.
If alarm not heard:
If error message not displayed
SERVICE MANUAL 6200-43E REV. A
3.4 Diagnostic Tests
WELCH ALLYN ATLAS MONITOR 25