Keypad Test; Auto-On / Auto-Off Test; Backlight Test For Lcd And Keypad - DeVilbiss IntelliPAP DV54 Service Manual

5.
C. KEYPAD TEST
No additional equipment required.
1. Apply AC power to the unit. If the blower is running,
press the ON/OFF key on the keypad so that the
blower stops and the LCD displays 'OFF'.
2. While pressing both the Down Arrow and Delay
keys, press the ON/OFF key to start the blower and
enter clinical mode.
3. Press the Next Item key until Delay Time is shown
on the LCD display.
4. Note the Delay Time; then change it by pressing the
Up and Down arrow keys. Use the arrows keys to
return the Delay Time back to the original setting.
5. Use the Previous Item key to return to the Set Pres-
sure screen.
6. If any of the keypad keys did not function correctly
during this test, replace the PC control board using
Service Instructions.
D. AUTO-ON / AUTO-OFF TEST
Additional equipment required: 6 ft x 22 mm smooth bore
tubing.
1. Apply AC power to the unit. If the blower is running,
press the ON/OFF key on the keypad so that the
blower stops and the LCD displays 'OFF'.
2. While pressing both the Down Arrow and Delay
keys, press the ON/OFF key to start the blower and
enter clinical mode.
3. Press the Next Item key until Enable Menu is dis-
played, and then press the Down Arrow key to enter
the sub-menu.
4. Press the Next Item key until the Auto-ON setting
is displayed. Use the Up or Down Arrow keys to set
the value to Enabled.
5. Press the Next Item key until the Auto-OFF setting
is displayed. Use the Up or Down Arrow keys to set
the value to Enabled.
6. Press the ON/OFF key on the keypad so that the
blower stops and OFF is displayed on the LCD.
7. Connect the 6 ft x 22 mm smooth bore tubing to the
CPAP and block the airfl ow with your hand or a plug.
8. Turn the blower ON by pressing the ON/OFF key on
the keypad.
9. Keep the airfl ow blocked for two minutes. Verify that
the blower continues running and no mask alerts ap-
pear.
10. Unblock the smooth bore tubing to open the unit's
airfl ow.
11. Verify that after approximately 10 seconds the LCD
12 LT-2027
shows 'Mask OFF'. If the mask alert did not appear,
go to step 14.
12. After another 20 seconds the blower should turn
OFF via the Auto-OFF feature. Wait approximately
two minutes after the blower turns OFF. Verify that
the blower does not turn back ON without breathing
present.
13. Tap the palm of your hand on and off the end of the
smooth bore tubing to simulate breathing and verify that
the blower turns ON via the Auto-ON feature.
14. If any of the Auto-OFF or Auto-ON features do not
work correctly, perform a full calibration using the
Manual Calibration Procedure.
E. BACKLIGHT TEST FOR LCD AND
KEYPAD
No additional equipment required.
1. Apply AC power to the unit. If the blower is running,
press the ON/OFF key on the keypad so that the
blower stops and the LCD displays OFF.
2. Press the ON/OFF key and verify that the LCD and
keypad backlight are lit.
3. Wait one minute and verify that the LCD and keypad
backlights reduce intensity.
4. Press any keypad key, except ON/OFF, and verify
that the LCD and keypad backlights return to full
intensity.
5. If the LCD or keypad backlights did not function
correctly during this test, replace the LCD, keypad
and/or PC control board.