p/n 18603-001, Rev. J
LTV
®
1200, 1150, and 1100 Ventilator Service Manual
Page 7-41
Symptoms
Possible Causes
What to Do
Control
Test
No message is
displayed when some
control
buttons are
pressed.
Wrong model selected in
maintenance mode.
Verify the correct
MODEL
has been
selected in
VENT MTNCE
. See
Chapter 6
- Maintenance & Calibration.
Control
Test
Correct message is
not displayed when
Set Value
knob is
turned, or incorrect
message is displayed.
Rotary switch is
disconnected.
Defective rotary switch.
Verify the rotary switch is properly
connected. If necessary, replace the rotary
switch assembly.
See
Rotary Switch (Set Value Knob)
Assembly
in Chapter 8 for instructions.
Defective main board.
Replace the main board. See
Main Board
Assembly
in Chapter 8 for instructions.
Control
Test
The name of a button
control is not displayed
when the control is
pressed or an incorrect
control name is
displayed.
Front panel ribbon cable
not properly connected.
Remove the power board to access the
ribbon cable connection on the main
board. Disconnect and reconnect the front
panel ribbon cable connector. See
Main
Board Assembly
in Chapter 8 for
instructions. Handle the ribbon cable
carefully to avoid scratching or damaging
it.
Front panel ribbon cable
damaged.
Defective switch.
Replace the front panel. See
Front Panel
in Chapter 8 for instructions
Defective main board.
Replace the main board. See
Chapter 8 -
Main Board Assembly
for instructions.
LEAK
Test
Leak test fails.
Circuit connections or
accessories are leaking.
Wye is not properly capped.
Reseat or replace the leaking circuit parts,
accessories or connections. Verify the wye
is securely capped. See
Leak Test
in
Chapter 2 for instructions.
Internal flexible tubing
occluded or pinched.
Internal flexible tubing has
pinhole leaks or leaking at
connections.
This problem will often be accompanied by
XDCR FAULT
.
Open the vent and verify
that none of the flexible tubes connected to
the solenoid manifold or analog board are
pinched or leaking. See
Internal Flexible
Tubing
in Chapter 8 for routing information.
Over pressure relief valve
leaking.
Subambient relief valve
leaking.
Flow valve leaking.
Replace the flow valve. See
Flow Valve
Assembly
in Chapter 8 for instructions.
VHome
setting does not
match flow valve.
Correct the VHome setting. See
Chapter 6
- Maintenance & Calibration.
LEAK
Test
Leak test fails with
LEAK --- FAIL
message.
Internal problem with the
turbine.
Verify wiring to turbine. Replace turbine
manifold or motor PCBA.
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