LTV 1150 - Page 119

p/n 18603-001, Rev. C LTV
®
1200/1150 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.
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.
Control Test
Correct message is
not displayed when
Set Value knob is
turned, or incorrect
message is displayed.
Defective main board. Replace the main board. See Main Board
Assembly in Chapter 8 for instructions.
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
Control Test
The name of a button
control is not displayed
when the control is
pressed or an incorrect
control name is
displayed.
Defective main board. Replace the main board. See Chapter 8 -
Main Board Assembly for instructions.
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.
LEAK Test
Leak test fails.
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.