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Appendix E: M3110, M3310, and M3820 telephones Page 481 of 504
Telephones and Consoles Description, Installation, and Operation
Procedure 82
Installing the Power Board
1 Open the Telephone.
a. Place the telephone, upside-down, on a padded, level surface.
b. Using a #1 Phillips screwdriver, remove the two screws holding the
footstand (if fitted).
c. Disconnect and remove all cords including the handset and headset
if fitted, from the telephone.
d. Use a #1 Phillips screwdriver and remove the four screws holding the
base of the telephone.
2 Install the Power Board.
a. Remove the cable from the power board including the right angle
header.
b. Disconnect the display cable from P4 on the main PCB. Note the
orientation of this connector.
c. Place the power board to the left of the main PCB with the widest
section of the power board nearest the display. Make sure that the
display cable comes over the power board.
d. Clip the power board in place, by inserting the right hand side of the
board under the clip, then push down on the left hand side adjacent
to the clips provided.
e. Use a #1 Phillips screwdriver and the screw supplied to fasten the
power board to the front cover of the telephone.
f. Remove and discard the two links on J8 on the telephone's main
PCB.
g. Connect the power board cable (B0247405) to J8.
h. Note the key to prevent misconnection.
i. Connect the cable to the header at H1 on the power board as shown
in the figure below).
j. Reconnect the display cable to P4.
Note: Do NOT twist the cable.