Self-tests
Puritan Bennett™ 700 Series Ventilator System Service Manual
10070389 Rev. A
3-3
3.2.3 How the ventilator responds to a POST error
If POST detects an error, it attempts to log the diagnostic code into the test log. In addition,
it responds in one of these ways:
•
If the error could be expected to compromise proper ventilation
, a VENT INOP condition
is declared. As a result, POST is terminated, and the ventilator is placed into the safety
valve open (SVO) state. To clear the VENT INOP condition, you must repair the ventilator
and run and pass EST before ventilation can resume. To do so, first cycle power to the
ventilator. The ventilator will now let you access a limited set of service menu functions,
such as reviewing the test log and running EST (see Chapter 4).
•
If POST detects (1) a low battery or no battery, (2) low oxygen supply pressure, (3)
that a key was pressed while POST was being run due to a soft reset (rather than
a power-on), (4) a blocked or missing air intake filter, (5) incorrect tubing
connection between P
cyl
and P
i
/P
e
transducer, or (6) the safety valve is stuck
closed
, it notes the relevant condition, but POST otherwise continues. A technical
alert is annunciated after the completion of POST to inform the operator.
•
If other types of errors are detected
, the error is logged and the ventilator resets.
If POST still does not pass, the ventilator issues up to two more system resets,
waiting for POST to pass, before a VENT INOP condition is declared. As a result,
POST is terminated and the ventilator is placed into the SVO state. To clear the
VENT INOP condition, you must repair the ventilator and run and pass EST before
ventilation can resume. To do so, first cycle power to the ventilator. The ventilator
will now let you access a limited set of service menu functions, such as reviewing
the test log and running EST (see Chapter 4).
•
If POST1 (UI) fails
, the message window displays this message:
xxxx
POST running...
NPB 7x0 S/W Rev x
PM Due: xxxxx
where the first line is the diagnostic code.
• If POST1 (BD) or POST2 (BD) fails, the ventilator declares a VENT INOP condition.
The ventilator flashes the diagnostic code on the BD section (left side) of the
controller PCB in the following sequence:
1.
The four LEDs flash the most significant digit (MSD) of the 5-digit error code.
2.
All four LEDs flash on and off once.
3.
The four LEDs flash the second MSD of the 5-digit error code.
4.
All four LEDs flash on and off once.
5.
The four LEDs flash the third MSD of the 5-digit error code.
6.
All four LEDs flash on and off once.
7.
The four LEDs flash the fourth MSD of the 5-digit error code.
8.
All four LEDs flash on and off once.
9.
The four LEDs flash the least significant digit (LSD) of the 5-digit error code.
10. All four LEDs flash on and off 10 times.
This sequence repeats indefinitely. Each digit is in binary format, with the most
significant at the left.
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