Self-tests
Puritan Bennett™ 700 Series Ventilator System Service Manual
10070389 Rev. A
3-5
POST2 (UI)
Number of soft resets test – Checks whether three soft resets have occurred in the past 24
hours of operation.
POST2 (UI)
NVRAM test – Verifies integrity of NVRAM data.
POST2 (UI)
Hardware ID test – Verifies versions of installed hardware are compatible with version of
installed software.
POST2 (UI)
Voltages test – Checks voltages monitored by the UI.
POST2 (UI)
Temperatures test – Checks temperatures monitored by the UI.
POST2 (UI)
Real-time clock test – Verifies validity (not correctness) of real-time clock’s date and time.
POST3 (UI and BD)
POST synchronization – Performs handshaking between UI and BD sections.
POST3
(UI and BD)
POST message exchange – The BD section sends the UI section this information:
•
BD POST status
•
Offsets for transducers zeroed by the BD section
•
Results of BD analog signal tests
The UI section sends the BD section this information:
•
The ventilator model (740 or 760) in use
•
Current operating mode (for example, normal, SST, EST)
•
Offsets for transducers zeroed by the UI section
•
Overall status of UI POST
•
Algorithm constants
•
Constants stored in NVRAM
POST3 (BD)
Autozeroing of cylinder and exhalation pressure transducers
POST3 (UI)
Zeroing of exhalation flow sensor – Zeroes exhalation flow sensor. Updates the DAC values
for the oxygen regulator pressure transducer and the inspiration pressure transducer using
the DAC values stored in the serial EPROM the last time the transducers were zeroed.
POST3 (UI)
UI key release test – Is run only if a key was previously held down. Verifies any key found
down was released. If POST was run due to a soft reset, a failure of this test results in a
technical alert. If POST was run due to an operator powering on the ventilator, the ventilator
waits a maximum of 60 seconds for the operator to release the key. If the key is not released
by then, a stuck-key failure is assumed.
POST3 (UI)
Batteries test – Check internal and external battery voltages to determine if the batteries are
installed, and if installed, if they are adequately charged.
Table 3-2: POST routines (continued)
Section of POST
Description of routine
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