Pca Access And General Maintenance; Display Access - Fluke III Series Calibration Information Manual

PCA Access and General Maintenance

To avoid electrical shock, remove the test leads before opening the case, and
close the case before operating the meter. To prevent fire, install fuses with the
rating shown on the back of the meter.
To avoid contaminating the pca with oil from the fingers, handle it by the edges
or wear gloves. Pca contamination may not cause immediate instrument failure
in controlled environments. Failures typically show up when contaminated
units are operated in humid areas.
Use the following procedure for removing the pca (printed circuit assembly) from its case:
1. Set the function switch to OFF, and disconnect test leads if they are installed.
2. Remove the four Phillips screws from the bottom cover.
3. Turn the meter face up, grasp the top cover, and pull the top cover from the meter. For most models,
this will best be accomplished by first lifting up the top cover at the input terminal end, followed by the
display end.
4. Some Series III Meters have a fuse on the lower portion of the pca. This fuse must be removed to
access the screw that holds the pca to the case bottom.
5. The pca may now be removed from the bottom cover.

Display Access

Do not handle the conductive edges of the LCD interconnects. If contaminated,
clean with alcohol.
Refer to Figure 1 or 2 depending on the model.
1. Remove the four Phillips screws from the back side of the pca.
2. Remove the LCD mounting bracket.
3. Insert a small screwdriver under the edges of the display holding bracket, and gently pry the bracket
loose from the snaps.
4. Turn the bracket upside down to remove the LCD.
5. Before installing a new LCD, make sure that all connector contact points are clean.
Warning
Caution
Caution
PCA Access and General Maintenance
Multimeters
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