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Self-tests
Puritan Bennett™ 700 Series Ventilator System Service Manual
10070389 Rev. A
3-19
11
Check valve test
Establishes flows of 50, 100, and
150 L/min while monitoring
cylinder and inspiration pressure
transducer readings. Verifies
that difference between these
two, simultaneous transducer
readings < 4 cmH
2
O.
Replace cylinder outlet check valve.
NOTE:
If the monitored oxygen concentration
of delivered gas is too low, the outlet or
inlet check valve may be stuck open.
Apply negative pressure to the wye. If
system pressure stays low, check for a
stuck check valve.
12
Piston leak test
Advances piston to maintain
cylinder pressure of 40 cmH
2
O.
Verifies that at each calibration
position, piston leak is within
range of calibrated leak values
in NVRAM.
1. Make sure oxygen source pressure is
between 40 and 90 psi (275 and 620 kPa).
2. Verify ventilator outlet port is blocked and
not leaking.
3. Perform a leak test using diagnostic EST
(
Diagnostics/Calib
function in service
menu).
4. Use
Review constants
function in service
menu to verify that piston leak constants
are as stated on calibration label. Input
correct constants, as required.
5. Replace cylinder inlet check valve.
13
Lights-displays test
VENTILATOR
STATUS indicators
VENTILATOR
SETTINGS LEDs
VENTILATOR
SETTING LCDs
PATIENT DATA
LEDs
PATIENT DATA
LCDs
Message window
(LCD panel) upper
and lower blocks
Turns on lights and displays and
verifies user reports them lit.
1. Verify LCD panel/UI display PCB connection
is secure.
2. Replace LCD panel.
3. Replace UI display PCB.
4. Replace controller PCB.
14
Keys test
Prompts user to press keys and
checks for keyswitch closure.
1. Replace keyboard assembly.
2. Replace controller PCB.
15
Main alarm test
Sounds alarm at three volumes
and verifies user reports hearing
it.
1. Check speaker resistance (6 to 8
Ω
).
2. Check main ventilator head harness
continuity. Replace harness, as required.
3. Replace speaker.
4. Replace pressure solenoid PCB.
16
Backup alarm test
Sounds piezo alarm and verifies
user reports hearing it.
1. Check main ventilator head harness
continuity. Replace harness, as required.
2. Replace speaker.
3. Replace pressure solenoid PCB.
Table 3-9: EST troubleshooting (continued)
EST
test no.
Test name
How the ventilator performs the
test
Corrective action
Summary of Contents for Puritan Bennett 700 Series
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