Fluke 77 - Manual (Page 29)

77 Series III
Service Manual
3-4
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.
4. Remove the 11A fuse to access the screw that holds the pca to the
case bottom.
5. The pca may now be removed from the bottom cover.
3-3. Display Access
Caution
Do not handle the conductive edges of the LCD
interconnects. If contaminated, clean with alcohol.
Refer to Figure 3-1.
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.
3-4. Cleaning
Caution
To avoid damaging the meter, do not use aromatic
hydrocarbons or chlorinated solvents for cleaning.
These solutions will react with the plastics used in
instruments.
Do not allow the LCD to get wet. Remove the display
assembly before washing the pca and do not install
until the pca is completely dry.
Do not use detergent of any kind for cleaning the
pca.
Do not remove lubricants from the switch when
cleaning the pca.