Covidien Puritan Bennett 700 Series, Руководство по обслуживанию

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Self-tests
3-16 10070389 Rev. A Puritan Bennett™ 700 Series Ventilator System Service Manual
Table 3-9: EST troubleshooting
EST
test no.
Test name
How the ventilator performs the
test
Corrective action
1
DAC-ADC loop test Zeroes flow sensor pressure
transducer (P
f
) and exhalation
pressure transducer (P
e
).
Compares transducer readings
(from A/D converter) to
expected (autozero DAC) values.
1. Replace pressure solenoid PCB.
2. Replace controller PCB.
2
Safety valve test Pressurizes system, incrementing
by 0.4 cmH
2
O every 10 ms, to a
maximum of 70 cmH
2
O, until
safety valve cracks. Compares
expected pressure with actual
cracking pressure.
1. Check safety valve/ventilator head harness
connection is secure.
2. Check safety valve resistance (10.5 to 14
Ω
).
3. Replace safety valve.
4. Replace pressure solenoid PCB.
3
Motor sensor test Moves piston at 50, 100, and
150 L/min and compares
monitored velocities against
expected values. 1. Check harness from controller PCB to
motor/encoder.
2. Replace motor/encoder.
3. Replace controller PCB.
4. Replace pressure solenoid PCB.
4
Zeroing of P
O
Zeroes oxygen pressure
transducer in oxygen regulator
and reads pressure. Compares
pressure reading with
calibration value in NVRAM. 1. Make sure oxygen source pressure is
between 40 and 90 psi (275 and 620 kPa).
2. Repeat this test and verify oxygen is
disconnected and reconnected when
prompted.
3. Check oxygen regulator pressure
transducer/ventilator head harness
connection is secure.
4. Recalibrate oxygen regulator pressure
transducer.
5. Replace oxygen regulator pressure
transducer.
6. Replace pressure solenoid PCB.
5
O
2
solenoids test Verifies O
2
is within 21% ±3%
before energizing. Energizes
low-flow and high-flow
solenoids individually and waits
for significant change in FIO
2
.
Verifies oxygen sensor reads
>25% O
2
(low-flow solenoid)
and >50% O
2
(high-flow
solenoid).
1. Make sure oxygen source pressure is
between 40 and 90 psi (275 and 620 kPa).
2. Check that oxygen regulator assembly/
ventilator head harness connection is
secure.
3. Use Review constants function in service
menu to verify that oxygen regulator
assembly constants are as stated on
calibration label. Input correct constants,
as required.
4. Check oxygen solenoid resistances (low-
flow--95 to 126
Ω
, high-flow--36 to 51
Ω
).
Replace oxygen regulator assembly, as
required.
5. Verify that voltage to solenoids is between
+23 to +25 V.
6. Replace oxygen regulator assembly.
7. Replace pressure solenoid PCB.