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Remove and Replace
6-8
WFM90D and WFM91D Service Manual
For instruments with serial numbers B020100 and above.
Remove. To remove the LCD Display assembly:
1. Remove the top cover. Refer to Top Cover on page 6--5.
2. Grasp the sides of the Display assembly and lift the assembly as shown in
Figure 6--2 so that you can access the cables underneath the assembly.
3. Disconnect the 20-pin ribbon cable as follows: (Refer to Figure 6--2 on
page 6--9 and Figure 6--3 on page 6--10 for cable locations.)
a. Locate the connector latch on the back side of the LCD Display
assembly and pull the latch out as shown in Figure 6--2 on page 6--9.
b. Pull the ribbon cable out of the connector.
4. Disconnect the 10-pin ribbon cable from the bottom of the Display assembly.
5. Remove the LCD Display assembly from the instrument.
NOTE. The 20-pin cable connecting the L CD Display assembly to the Bottom
board is a zero insertion-force ribbon cable.
Replace. To replace an LCD Display assembly:
1. Connect the 10-pin ribbon cable from the Bottom board into the back of the
display assembly.
2. Connect the 20-pin ribbon cable from the Bottom board into the back of the
display assembly.
3. If you are installing a new ribbon cable, set the display just above its resting
position on the locating feet. Use your finger to crease the ribbon cable so
that when the display is set down on the locating feet, the ribbon cable does
not raise the display up off of the locating feet.
4. Set the display assembly onto the four locating feet. The locating feet fit into
small holes in each of the four corners on the back of the display. See
Figure 6--3.
CAUTION. To avoid damaging the LCD display, do not touch the face of the
display because it is hard to clean and is easily scratched.
LCD - Newer Instruments