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Service and repair
8-52
10070389 Rev. A
Puritan Bennett™ 700 Series Ventilator System Service Manual
8.10.3.8 Updating NVRAM data
If the NVRAM on the controller PCB fails, install a new NVRAM. After powering on the
ventilator, update NVRAM data as follows:
1.
Use
Update constants
function in the service menu (Section 4.2.3.5) to update the
following calibration constants:
• Piston
• Flow sensor
• Oxygen mixing
These calibration constants are printed on labels placed inside the ventilator lid.
2.
For ventilators with software revision H or later
, always input the calibration constants of
the new pressure solenoid PCB into NVRAM using the
Update prsol nvram
function in
the service menu (Section 4.2.3.5). To ensure correct function of the pressure solenoid
PCB, you must perform the
Update prsol nvram
function
before
the
O
2
pressure calib
and
FIO
2
sensor calib
functions.
3.
Perform the following calibrations (Section 4.2.3.2.2):
• PEEP pump
• Oxygen pressure transducer
• FIO
2
calibration check
4.
Update the following service information (Section 4.2.3.7):
• Reset battery in use
• Reset next service (accept the setting closest to the previous ventilator history)
• Reset serial number to correspond to the serial number plate.
5.
Perform a complete performance verification (Chapter 5).
NOTE:
The ventilator’s operational hours will be lost when NVRAM is replaced.
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