Replacing The Lcd Window/Decal; Removing The Keypad And Keypad Foil; Disassembling The Main Pca Unit - Fluke 199B Service Manual

6.2.7 Replacing the LCD Window/Decal

The LCD window/decal (Figure 6-5, item 2) is glued on the top cover. To replace it do
the following:
1. From the inside of the top cover push the window outwards until it comes of.
2. Carefully remove remains of glue from the top cover . The bulk of the glue can be
removed with sticky tape. This action must be completed by cleaning the surface
with alcohol.
3. Remove the protection foil from the new window
4. Firmly press the new window on the top cover.

6.2.8 Removing the Keypad and Keypad Foil

To avoid contaminating the keypad contacts, and the keypad
foil contacts with oil from your fingers, do not touch the
contacts (or wear gloves). Contaminated contacts may not
cause immediate instrument failure in controlled environments.
Failures typically show up when contaminated units are
operated in humid areas.
Referring to Figure 6-5, use the following procedure to remove the keypad and the
keypad foil.
1. Remove the display assembly (see Section 6.2.6).
2. Remove the keypad support plate item 6.
3. Remove the keypad foil item 5. Notice the keypad foil positioning pins in the top
case for reassembly.
4. Remove the keypads item 3 and item 4.

6.2.9 Disassembling the Main PCA Unit

To avoid contaminating the main PCA with oil from your
fingers, do not touch the contacts (or wear gloves). A
contaminated PCA may not cause immediate instrument failure
in controlled environments. Failures typically show up when
contaminated units are operated in humid areas.
Referring to Figure 6-7, use the following procedure disassemble the main PCA unit.
1. Unscrew the four M3x10 Torx screws (items 9) that secure the shielding cover
(item 8), and remove the shielding cover.
2. Unscrew the M3x15 standoffs (item 10) that secure the PCA to the shielding box
item 1.
3. Remove the PCA from the shielding box.
4. To remove the isolation strip pull one end out of the sleeves in the PCA (pull at
points A). Then pull out the other end (pull at points B).
6.2. Disassembly & Reassembly Procedures
Caution
Caution
Disassembling the Test Tool
6
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