Remove and Replace
6-22 WFM90D and WFM91D Service Manual
The following proceduretells you how to remove the Backlight board and
reinstall the sameboard (for example, to gain access to another assembly). To
replacethe Backlight board, you must replacethe LCD Display assembly;
contact your Tektronixrepresentative to order the replacement kit, which
includes installationinstructions.
NOTE. The Backlight boardis present only in instruments with serial numbers
below B020100 that have not beenupgraded. At serial number B020100, the
Backlight boardwas incorporated into the new LCD Display assembly.
If your instrument has an SDIboard installed, be careful not to disconnect the
cables fromthe SDI board.
Remove. Toremove the Backlight board:
1. Remove the top cover.Refer to Top Cover on page 6--5.
2. Disconnect thetwo backlight wires from the LCD display assembly. See
Figure 6--10.
3. Remove the battery cover.Refer to Battery Cover on page 6--25.
4. Lift on the Bottom board whilepressing on the battery connector in the
battery compartment.
5. Gently pull the Backlight boardfrom the back of the Bottom board and
remove the boardfrom the instrument.
Replace. Toreplace the Backlight board:
1. Be sure that theB acklightboard shield is in place.
2. Install the Backlight board into the back of the Bottom board.
3. Align the Backlight and Inputboards with the slots in the bottom cover and
gently slide the boards into the bottom cover.
4. Connect the two backlightwires to the LCD display assembly.
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.
Backlight Board