Fluke 87 V/AN, Руководство по обслуживанию

Страница: 29 / 50

Digital Multimeter
Basic Maintenance
21
Accessing the PCA and Replacing the LCD
Once the case has been opened, the A1 Main PCA can easily be removed. The shields
disconnect from the PCA as follows:
1. Remove the five Phillips-head screw securing the top and bottom shields to the PCA.
2. Remove the top shield assembly that also houses the LCD and lightpipe for the LCD
backlight.
3. To access the LCD, unsnap the LCD mask using a small flat-blade screwdriver. The
LCD may now be removed. Refer to Figure 3.
Note
Two elastomeric connectors make electrical contact between the LCD and
the PCA. These connectors usually stick to the LCD when it is removed. If
the connectors are to be reused, do not handle them, as the electrical
contact points might become contaminated. Use tweezers to remove these
connectors.
4. To reinstall the connectors, replace the LCD and LCD mask and lay the top shield
face down. Install the elastomeric connector strips into the slots on the top shield.
5. Place the PCA onto the top shield so that the screw holes align.
6. Place the bottom shield onto the PCA and secure the assembly with five Phillips-
head screws. Ensure that the shields are tightly attached. Properly fitted shields are
required for the Meter to perform to specifications.
LCD
LCD Mask
ama08f.eps
Figure 3. Removing LCD Mask to Access LCD