20
LT-2 027
18. Read the Compliance Meter (“Up<cr>”)– a new PC board should have 00000
hours. Clear the Compliance meter if it is not zero by typing ‘Up=c<cr>’. The
CPAP will return 000000.0 hours.
19. Check the fi rmware and hardware version information. Read and record the
following:
• BIOS rev “VB<cr>”
• Firmware rev “VF<cr>”
Check the present version of fi rmware to make sure the board is up to date.
Install new fi rmware if the board has an old version.
20. Check for last saved error, type ‘El<cr>’. The CPAP will respond with “Exx
dd/mm/yyyy” where xx is the last saved error code and dd/mm/yyyy is the
date that the error was detected. Clear the last error by typing ‘Ec<cr>’, the
CPAP will return “OK.” Verify that the error code is “00” by typing ‘El<cr>’.
21. Set all device settings to their default values by typing ‘TD<cr>’.
The CPAP should return “OK.”
22. Recalibrate the unit.
E. POWER SUPPLY BOARD REMOVAL
CAUTION– Failure to wear anti-static equipment during service may damage
this device.
1. See instructions above to remove the cover and the control PC board.
2. Wearing an anti-static device and with the power supply board facing you, apply
thumb pressure to top left corner of the board while pulling the top right corner
up and out of the mount clip at its bottom.
3. Pulling the top left corner out of its mount clip, lift the board off the chassis.
4. If returning the power supply board to the unit, place the board onto a clean,
fl at, static-free surface with its large components facing up OR if discarding the
power supply board, remove the two wire harnesses for use with the replace-
ment board or purchase a new wire harness kit.
F. POWER SUPPLY BOARD REPLACEMENT
CAUTION– Failure to wear anti-static equipment during service may damage
this device.
1. See instructions above to remove the cover, the control PC board and the
power supply board.
2. Wearing an anti-static device, connect the wire harnesses from the old power
supply board to the new power supply board.
3. Position the chassis so that the blower faces down and the inlet and outlet ports
face you. Position the power supply board so that the components are facing
away from you with the large brown component in the bottom left corner and
the small blue component in the top right corner.
4. Place the board into the mount clips at the bottom of the power supply board cavity
and press down fi rmly on the top corners until the board is fully mounted.
5. See instructions above to replace the control PC board and the cover.
9.
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