43B
Service Manual
6-8
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 1, 2 item
9, COM input item 10, see Figure 4-6).
2. Do not forget to install the power connector insulator (item 3) and the LED holder
(item 6).
3. Notice the correct position of the shielding box, main PCA (notice the shielding
plates on the PCA), and shielding plate, as shown in Figure 6-2. The tabs of the
shielding plate must be inside both shields.
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
of dust and grease.
2. Install the keypad. Press the edge of the keypad into the sealing groove of the top
case. Ensure that the keypad lays flat in the top case, and that all keys are correctly
seated.
3. Install the shielding foil (item 2). Remove the protection foil from the shielding foil,
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.
4. Install the dust seal (item 3).
5. Install the display shielding bracket (item 5) provided with the conductive foam strip
(item 4).
Note
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.
6. Install the keypad foil. Align the positioning holes in the keypad foil to the
positioning pins in the top case.
7. Clean the display glass with a moist soft cloth if necessary. Install the display
assembly. Ensure that the display is secured correctly by the four alignment tabs in
the top case. It is secured correctly when it cannot be moved horizontally.
8. Install the keypad pressure plate. Press the plate firmly, and slide it under the four
plastic keeper tabs in the top case.
9. Install the main PCA unit, and re-attach the cables. Secure the flat cables in the
connectors with the connector latches. Twist the backlight wires to minimize
interference voltages! Insert the shielding flap below the main PCA shielding plate.
10. Put the bottom case and the top case together at the flat cable side, and hinge the
cases to each other. This ensures the keypad foil flat cable is folded correctly.
11. Install the battery pack, and the battery door, see figure 6-5.
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