Reassembling The Main Pca Unit; Reassembling The Test Tool - Fluke ScopeMeter 123 Service Manual

123
Service Manual

6.4 Reassembling the Main PCA Unit

Reassembling the main PCA is the reverse of disassembly. However you must follow
special precautions when reassembling the main PCA unit.
1. Ensure the input banana jacks have the rubber sealing ring in place (Input A, B item
2. Do not forget to install the power connector insulator (item 3) and the LED holder
3. Notice the correct position of the shielding box, main PCA (notice the shielding

6.5 Reassembling the Test Tool

Reassembling the test tool is the reverse of disassembly. However you must follow
special precautions when reassembling the test tool. Refer also to figure 6-1.
Reassembling procedure for a completely disassembled unit:
1. Clean the inside of the lens with a moist soft cloth if necessary. Keep the lens free
2. Install the keypad. Press the edge of the keypad into the sealing groove of the top
3. Install the shielding foil (item 2). Remove the protection foil from the shielding foil,
4. Install the dust seal (item 3).
5. Install the display shielding bracket (item 5) provided with the conductive foam strip
6. Install the keypad foil. Align the positioning holes in the keypad foil to the
6-8
9, COM input item 10, see Figure 4-6).
(item 6).
plates on the PCA), and shielding plate, as shown in Figure 6-2. The tabs of the
shielding plate must be inside both shields.
The first shipped units are provided with a yellow tube on the
two notches with the screw inserts at the top in the top case,.
The reason for this is that the display assembly in these units
is smaller than in the later units. All display assemblies
supplied as spare part are of the latest type, and do not need
the yellow tubes in the top case.
•
Remove the tube from both notches when installing a new
display assembly!
•
Transfer the tubes to the new top case, if you replace a top
case that has the tubes installed, and you re-install the
unit's original display assembly.
of dust and grease.
case. Ensure that the keypad lays flat in the top case, and that all keys are correctly
seated.
by pulling it off in one rapid movement! If you pull it off slowly, the protection foil
may crack. Keep the shielding foil free of dust and grease.
(item 4).
Figure 6-4 shows how the shielding bracket (with conductive foam strip),
the shielding foil, the dust seal, and the display assembly (see step 7) are
clamped in the top cover edge.
positioning pins in the top case.
Caution
Note