CareFusion LTV 1200 Service Manual page 89

Symptoms
CONTINUED ...
Delivered pressure is
low, PEEP is low,
ventilator is auto
cycling.
Delivered pressure is
low.
Monitored pressure is
low.
Page 7-12
Possible Causes
Failed auto zero.
VHome setting does not
match flow valve.
Failed calibration.
Bypass flexible tube
pinched.
Pinhole leaks in bypass
flexible tube.
Internal flexible tubing
occluded or pinched.
Internal flexible tubing has
pinhole leaks or leaking at
connections.
Defective flow valve.
Defective turbine.
Defective analog board.
Defective power board.
®
LTV 1200, 1150, and 1100 Ventilator Service Manual
What to Do
Perform an auto zero under XDCR ZERO.
®
See the LTV 1200, 1150, or 1100
Ventilator Operator's Manual for more
information.
Correct the VHome setting. See Chapter 6
- Maintenance & Calibration.
Recalibrate the vent. See Chapter 6 -
Maintenance & Calibration for instructions.
If the problem reoccurs after careful
recalibration, a transducer may be drifting
excessively. Perform the Advanced Vte
Diagnostic Procedures, see page 7-23.
If the bypass flexible tube is pinched, it
can usually be seen pressed against the
louver openings in the bottom of the
ventilator case.
Open the ventilator and remove the back
panel. Replace the back panel being sure
to fit the louvers in between the upper and
lower loop of the bypass flexible tube
before seating the back cover.
If the bypass flexible tube is leaking,
replace it.
This problem will often be accompanied
by XDCR FAULT alarms. Open the vent
and verify that none of the flexible tubes
connected to the solenoid manifold or
analog board are pinched or leaking. See
Solenoid Manifold Assembly or Analog
Board Assembly in Chapter 8 for routing
information.
Calibrate the flow valve. See Flow Valve
Calibration in Chapter 6 for instructions.
Clean the Flow Valve following the Flow
Valve Cleaning Procedure, see page 8-66.
Perform the Advanced Vte Diagnostic
Procedures, see page 7-23.
If testing and cleaning fails, replace the
Flow Valve. See Chapter 8 - Flow Valve
Assembly and Cleaning Instructions.
Perform the Advanced Vte Diagnostic
Procedures, see page 7-23.
If testing fails, replace defective parts.
Replace the power board. See Power
Board Assembly in Chapter 8 for
instructions.
p/n 18603-001, Rev. J