Removing The Display Assembly; Removing The Keypad And Keypad Foil; Disassembling The Main Pca Unit - Fluke ScopeMeter 123 Service Manual

123
Service Manual

6.2.6 Removing the Display Assembly

There are no serviceable parts in the display assembly. Referring to Figure 6-1, use the
following procedure to remove the display assembly.
1. Remove the main PCA unit (see Section 6.2.5).
2. The keypad pressure plate (item 9) is captivated by four plastic keeper tabs in the top
3. Remove the display assembly (item 6). To prevent finger contamination, wear
After removing the display assembly, the shielding bracket (item 5) with the conductive
foam strip (item 4), the dust seal (item 3), and the shielding foil (item 2) can be removed.

6.2.7 Removing the Keypad and Keypad Foil

Referring to Figure 6-1, 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 foil. Notice the four keypad foil positioning pins in the top case.
3. Remove the keypad.

6.3 Disassembling the Main PCA Unit

Referring to Figure 6-3, use the following procedure disassemble the main PCA unit.
1. Remove the M2.5 Torx screws (items 1 and 8) that secure the main shielding plate
2. Pull the shielding plate away from the input banana jacks as you rotate the far end
3. Remove the power input insulator (item 3), and the LED guide piece (item 6).
4. Remove the M2.5.Torx screws (item 2) that secure the PCA to the shielding box.
5. Lift the PCA at the screw end approximately 2 cm, and pull it away from the input
6-6
Read the Caution statement in Section 6.5 when installing the
display assembly. An incorrect installation can damage the
display assembly.
case. Press the plate down, carefully slide the plate to release it from the tabs, and
then remove it.
cotton gloves, or handle the display assembly by its edge.
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.
(item 7) to the main PCA shielding box (item 5).
upwards, and then remove it.
banana jack holes to remove it.
Caution
Caution