LTV 1150 - Main Board Assembly; To replace the Main Board:

Page 7-4 LTV
®
1200/1150 Ventilator Service Manual p/n 18603-001, Rev. C
Symptoms Possible Causes What to Do
Displays are blanked while
on battery power.
To conserve battery life while running from
the internal battery, most of the displays
are turned off when no changes are made
to the control settings for 60 seconds. To
turn the displays back on, touch any
control or button or turn the Set Value
knob.
Ventilator is running
but displays are
turned off.
Defective main board. Replace the main board. See Main Board
Assembly in Chapter 8 for instructions.
Control not active in
selected mode.
If a control is dimmed, it is not active in the
currently selected mode and changing its
setting does not affect ventilation. (See the
LTV
®
1200 or the LTV
®
1150 Ventilator
Operator's Manual for an explanation of
Bright, Dim and Blank Control
Displays.)
Controls are locked. If the controls are locked, a LOCKED
message will be displayed when a control
is selected.
To unlock in EASY mode, press and
release the Control Lock button. To
unlock in HARD mode, press and hold the
Control Lock button for 3 seconds. (See
the LTV
®
1200 or the LTV
®
1150 Ventilator
Operator's Manual for an explanation of
the CTRL UNLOCK feature and Control
Lock button.)
Control is not selected. Before a control value can be changed, the
control must be selected. To select a
control, press the associated button. When
a control is selected, it is displayed at
normal intensity and all other controls are
dimmed. (See the LTV
®
1200 or the LTV
®
1150 Ventilator Operator's Manual for an
explanation of how to use the controls.)
Controls are limited. A control's value may be limited by the
current settings of other controls. To
change the value of the current control,
change the value of the flashing controls.
(See the LTV
®
1200 or the LTV
®
1150
Ventilator Operator's Manual for an
explanation of Control Limiting
.)
A control doesn't
activate.
Set Value knob
doesn't operate.
Wrong model selected. If an incorrect model is selected, some
controls may not be lit and will not
operate. Verify the model number selected
in VENT MTNCE, MODEL matches the
model number on the front of the
ventilator. See Chapter 6 -Maintenance &
Calibration for instructions.