Vent Inop Test; Table 4-5. Vent Inop Test Phases - Puritan Bennett 840 Service Manual

4
Message displayed
Unable to establish flow
Unable to program flash

4.2.10.4 Vent Inop Test

This function exercises the ventilator inoperative circuitry.
4.2.10.4.1 Running the Vent Inop Test
1
Enter Service Mode and select the Other Screens button.
2
Ensure air and oxygen are connected to the ventilator.
3
Connect the gold standard circuit between the To Patient and From Patient ports.
4
Select the Vent Inop Test button and press
5
The Vent Inop Test is composed of the phases indicated in Table 4-5. At the end of each
test phase, turn the ventilator power off, then on and restart Service Mode as instructed.
Observe the audio and visual alarms and respond as prompted.
GUI Vent Inop test
Vent Inop A test
Vent Inop B test
Vent Inop A ten second test
Vent Inop B ten second test
If a test phase fails ("Vent Inop Test failed" message in lower screen), powering the ventilator
down and back up into Service Mode will invoke the normal Service Mode. Troubleshoot as
indicated in Table 4-6. You must repeat the Vent Inop Test and pass it with no failures before
ventilation is allowed.
4-12
Table 4-4: Exhalation valve calibration errors (continued)
Error type Additional information
Failure Flow controller is not able to establish
a 5 L/min test flow via the expiratory
flow sensor.
Failure Unable to program calibration table
into BDU NOVRAM.
Table 4-5: Vent Inop Test phases
Test phase
Corrective action
1. Verify that there are no leaks or
occlusions.
2. Exit exhalation valve calibration
and perform flow sensor calibra-
tion.
3. Swap air PSOL (PSOL2) and oxy-
gen PSOL (PSOL1). If calibration
passes, replace PSOL2.
4. Swap air flow sensor (Q2) and oxy-
gen flow sensor (Q1). If calibration
passes, replace Q2.
5. Replace expiratory flow sensor
(Q3).
1. Check BDU +12 V supply and BD
CPU PCB.
2. Replace power supply.
3. Replace BD CPU PCB.
4. Replace AI PCB.
ACCEPT
.
Vent inop indicators tested
1. BDU alarm on (user prompt).
2. Ventilator inoperative and safety valve open
LEDs on (user prompt).
3. PSOLs/exhalation valve/safety valve inactive.
PSOLs/exhalation valve/safety valve inactive.
PSOLs/exhalation valve/safety valve inactive.
PSOLs/exhalation valve/safety valve inactive.
PSOLs/exhalation valve/safety valve inactive.
Puritan Bennett 800 Series Ventilator System Service Manual
Service mode