User's Manual

ManualsBrandsFluke ManualsPortable OscilloscopesFluke 123

101

102

103

104

105

106

107

108

109

110

123

Service Manual

6-6

6.2.6 Removing the Display Assembly

Caution

Read the Caution statement in Section 6.5 when installing the

display assembly. An incorrect installation can damage 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

case. Press the plate down, carefully slide the plate to release it from the tabs, and

then remove it.

3. Remove the display assembly (item 6). To prevent finger contamination, wear

cotton gloves, or handle the display assembly by its edge.

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.

Caution

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.

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

(item 7) to the main PCA shielding box (item 5).

2. Pull the shielding plate away from the input banana jacks as you rotate the far end

upwards, and then remove it.

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

banana jack holes to remove it.