LT-2320
10
T E S T I N G
7. Go to the Brightness menu and select Display in Active mode.
Rotate the knob and observe the change in the brightness of the
display. Protect the Display from room light if needed.
8. Return to the Brightness menu, select Controls in Active mode,
protect the Keys and Rotary Knob from room light, rotate the
knob and observe the change in the brightness of the keys and
knob. Select a brightness level.
9. Allow the Display to return to the main screen, view the pressure,
press the Ramp key and observe the Ramp pressure and the
remaining Ramp time on the Display.
10. Ensure that the Heater On/Hot Surface Indicator light is
illuminated.
11. Correct all settings to the original, preferred or prescribed
settings.
NOTE: If there is an issue with the functionality or brightness of the
Key Pad, Rotary Knob or Display, refer to Troubleshooting.
D. AUTO-START/AUTO-STOP TEST
Additional equipment required: an adult test lung or 6 ft (1.8 m) x 22
mm smooth bore tubing. Use of tubing with dimensions other than 6 ft
(1.8 m) x 22 mm will interfere with the Auto-START test. NOTE: The
change in tubing diameter allows testing without actual breathing. The
15 mm tubing has no issue activating Auto-START/Auto-STOP with
patient breathing.
Auto-STOP Test
1. Apply AC power to the unit with blower stopped.
2. Enter Clinical menu.
3. Go to CPAP Settings and select the Enable menu.
4. Ensure that a
9
appears beside both Auto-START & Auto-STOP
features.
5. Return to Patient menu.
6. Start the blower and keep the airflow blocked for two minutes.
Verify that the blower continues running and no mask alerts
appear.
7. Unblock the smooth bore tubing to open the unit’s airflow.
8. Verify that, after approximately 10 seconds, the Display shows
‘Mask Off / Please check mask fit’.
9. After another 30-40 seconds, the blower should stop via the Auto-
Stop feature. Wait approximately two minutes after the blower
stops. Verify that the blower does not start without breathing
present.
Auto-START Test
If using an adult test lung:
a. Attach lung to the tubing connector port on the unit.
b. Manually simulate breathing by manipulating the sides of the
lung – out for inhalation, then in for exhalation – and verify
that the blower starts via the Auto-START feature.
Auto-START Test
If using 6 ft (1.8 m) x 22 mm tubing:
a. Go to CPAP Settings and select Tubing. Ensure that tubing
Length is set to 6 ft (1.8 m) and diameter is set to 22 mm.
b. Connect the 6 ft (1.8 m) x 22 mm smooth bore tubing to the
CPAP.
c. Tap the palm of your cupped hand on and off the end of
the smooth bore tubing several times to verify that the
blower starts via the Auto-START feature. (Hold your
cupped hand 18 in. (45.7 cm) from the hose to force air
into the tubing using a slow steady ‘breath rate” to activate
the flow sensor.)
10. Correct all settings to the original, preferred or prescribed
settings, including the tubing diameter.
NOTE: If any of the Auto-STOP or Auto-START features do not
operate correctly, stop the blower for approximately 1 minute to allow
auto-calibration to occur. Start the blower and allow 30 seconds for the
pressure and flow to stabilize. If Auto-STOP or Auto-START features
still do not operate correctly, perform a full calibration using the Manual
Calibration Procedure. If manual calibration does not resolve issue,
replace PC board.
E. SD CARD AND SPEAKER
Additional equipment needed: SD card.
NOTE: The SD card must be a minimum of 128MB and a maximum of
2GB in size and formatted to FAT16.
1. Apply AC power to the unit and start the blower.
2. Listen for speaker ‘beep’ as SD card is inserted in SD card slot.
3. Verify that the notification on the Display reads: Card Detected /
Ready For Use
NOTE: If there is an issue with the speaker or SD card, replace the
speaker or SD card as needed.
F. SERIAL PORT
Additional equipment needed USB to Micro B USB CPAP to PC cable
(DV63D-615) and a PC computer running DeVilbiss SmartLink
software v 3.0 or higher.
1. Connect USB to Micro B USB cable to the unit and the computer.
2. Verify that the USB icon illuminates on the CPAP display (left
side).
3. Open SmartLink software and click on the Download Data icon in
the software’s Home tab.
4. Select Direct Connect option and complete the data download
5. Find and open the data downloaded to the software
6. Verify that the data is complete and accurate.
NOTE: If there is an issue with the data download, replace the USB
cable. If that does not fix the problem, replace PC board.
