Control Pc Board Replacement - DeVilbiss IntelliPAP DV54 Service Manual

9.
D. CONTROL PC BOARD REPLACEMENT
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, verify that the silicone rattails holding the key-
board onto the control board are pulled through the appropriate holes in the
board. See Key Pad & LCD Display instructions.
3. Place the chassis on a clean fl at surface with the blower facing down. Orient the
replacement board so that the keypad is over the rounded end of the chassis.
4. Tilt the board and connect the two wire harnesses near the power supply board
and insert the brown and blue wires into the notch on the chassis. Tilt the board
and connect the two wire harnesses near the outlet port. Connect the wire har-
ness near the right corner of the keypad. (Fig. 2)
5. Position the board (Fig. 3) so that: the hole on the board (A), located below the
ON/OFF key, is over the peg on the chassis; the small hole (B), located near
the LCD screen, is over the screw hole on the chassis; and the cut-out (C) on
the left rear corner fi ts around the protrusion above the air outlet port on the
chassis. Move any stray tubing from between the board and the chassis, verify
that all wire harnesses are properly routed, and replace the T-15 screw on the
board.
6. Replace the cover. See instructions above.
7. Connect the CPAP to a PC serial port with cable DV51D-615 and turn the
CPAP on.
8. Use a terminal program (such as Windows HyperTerminal, or equivalent) with
COM settings 9600 baud, no parity, 8 data bits, 1 stop bit, Flow Control set to
none.
9. When connection is established with the CPAP , the terminal program will show:
" RH ;" every 1/2 seconds. This display indicates that the CPAP is waiting for a
handshake.
10. Type ' rh ' and press ENTER. The CPAP should respond with the fi rmware ver-
sion in the form " V0.XX dd/mm/yyyy ." Please note that all commands are
case sensitive. Repeat this step if necessary to complete the handshake.
11. Type ' Mn<cr> '. The CPAP will report the model number saved in memory, it
should be " 000000 " if the PC board is new.
12. Read the model number from the CPAP label on the bottom of the unit (EX:
DV54SE).
13. Type ' Mn=nnnnnn<cr> ' where nnnnnn is the 6 digit model number read in
the previous step (use a space for the last digit if necessary to make the string 6
digits). The CPAP should return the new six-digit model number.
14. Type ' Sn<cr> '. The CPAP will report the serial number saved in memory, it
should be " 00000000 " if the PC board is new.
15. Read the serial number from the CPAP label on the bottom of the unit.
16. Type ' Sn=nnnnnnnn<cr> ' where nnnnnnnn is the 8 digit serial number read in
the previous step. The CPAP should return the new eight-digit serial number.
17. Read the Hour Meter (" Uh<cr> ")– a new PC board should have 00000
hours. It is recommended that the original hour meter value be restored if the
original blower is used. Set the hour meter by sending ' Uh=nnnn<cr> ' where
nnnn is the hour meter reading x 10 (Ex: 100.5 hours would be set by typing
' Uh=1005<cr> ').
2
3 A
B
LT-2027
C
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