Page 6-32 LTV
®
1200/1150 Ventilator Service Manual p/n 18603-001, Rev. C
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 perform a reset and the normal POST tests, then resume operating in
VENT MTNCE (DIP Switch #5 ON) mode as follows:
• At the end of POST the audible alarm will sound and a RESET alarm message will be
displayed.
• Press Silence Reset twice to clear the alarm and resume normal operation.
If the Watchdog Test fails:
Problem
Possible Cause What To Do
Vent does not reset when
watchdog test is performed.
Defective main board. Replace the main board. See
Chapter 8 - Main Board Assembly for
instructions.
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