Watchdog Test - CareFusion LTV 1200 Service Manual

Watchdog Test

The watchdog timer is used to verify that essential parts of the software are running at the
correct times. If the software does not update the watchdog timer correctly, the watchdog
timer causes the ventilator to inop. This item tests that the watchdog timer is operating
correctly.
To run the watchdog test:
1) Press Select while WDOG TESTis displayed in the VENT MTNCE menu.
2) The ventilator will restart, and begin the normal POST tests:
 At the end of POST the audible alarm will sound and a RESET alarm message will be
displayed and the ventilator will resume operation.
 Press Silence Reset twice to clear the alarm.
If the Watchdog Test fails:
Problem
Vent does not reset when
watchdog test is performed.
p/n 18603-001, Rev. J
Possible Cause
Defective main board.
®
LTV 1200, 1150, and 1100 Ventilator Service Manual
What To Do
Replace the main board. See
Chapter 8 - Main Board Assembly for
instructions.
Page 6-31