Remove and Replace
WFM90D and WFM91D ServiceManual 6-19
Remove. Toremove the Bottom board:
1. Remove the top cover.Refer to Top Cover on page 6--5.
2. Remove the LCD display assembly.Refer to LCD Display on page 6--7.
3. Remove the Topboard. Refer to Top Board on page 6--15.
4. Remove the battery cover.Refer to Battery Cover on page 6--25.
5. Lift on the Bottom board whileyou press on the battery connector in the
battery compartment.
NOTE. The Backlight boardis present only in instruments with serial numbers
below B020100, that have not been upgradedw ith a new displayassembly.
6. Gently pull the Backlight board (if present)from the back of the Bottom
board.
7. Gently pull the Input board assembly from the backof the B ottom board.
Replace. Toreplace the Bottom board:
1. Install the Input board into the back of the Bottom board.
NOTE. The Backlight boardis present only in instruments with serial numbers
below B020100, that have not been upgradedw ith a new displayassembly.
2. Align the Input board (and the Backlight board, if present)with the slots in
the bottom cover and gently slide the boards into the bottom cover.See
Figure 6--8on page 6--20.
3. Install the Topboard. Refer to Top Board on page 6--15.
4. Install the LCD display assembly.Refer to LCD Display on page 6 --7.
5. Install the top cover.Refer to Top Cover on page 6--5.
6. Install the batterycover. Refer to Battery Cover on page 6--25.
Bottom Board