Remove and Replace
WFM90D and WFM91D ServiceManual 6-15
Top BoardAssembly
The Topboard assembly contains replaceable subparts.
Remove. Toremove the Top board:
1. Remove the top cover.Refer to Top Cover on page 6--5.
2. Remove the two retaining screwsfrom the top of the Top board.
3. Gently pull on the bottom of Topboard to separate it from the Bottom board.
4. If you are replacingthe Top board, remove the keypad from the Top board.
Referto Keypad on page 6--16.
Replace. Toreplace the Top board:
1. Install the keypad if you have replacedt he Topbo ard. Refer to Keypad on
page 6--16.
2. Gently press on thebottom of the Top board to insert the Top board
connectorinto the Bottom board connector.
3. Be sure that the circuit boardshield is properly aligned. Referto Top Board
Shield on page 6--17.
4. Install the two retainingscrews into the top of the Top board.
5. Install the top cover.Refer to Top Cover on page 6--5.

TopBoard