Reassembling The Main Pca Unit - Fluke 199B Service Manual

Fluke 19xB-19xC-2x5C
Service Manual
5. To get access to the input circuits on the PCA, unscrew the Torx screws item 7 and

6.2.10 Reassembling the Main PCA Unit

Reassembling the main PCA unit is the reverse of disassembly (see figure 6.7). However
you must follow special precautions when reassembling the main PCA unit.
1. Install the metal input circuit shielding boxes (items 6) carefully. Take care that the
2. Attach the isolation strip carefully! Insert the ends of the strip into the slots in the
3. Put the PCA in the shielding box, and fasten the 2 hexagonal standoffs (item 10).
4. Attach the shielding cover (item 8). Ensure that the small optical gate PCA mounted
5. Ensure that the rubber sealing ring (item 5) for the power connector is present
6-8
remove the metal input circuit shielding boxes.
notches at the edges of the boxes match the holes in the PCA. The plate spring in the
Input A and Input B box must touch the C-ASIC N1000 (Input A) or N1200 (Input
B) for cooling. Do not bend the springs!
A good thermal coupling between the C-ASIC's (N1000, N1200)
and the input boxes is achieved by self adhesive thermal
conductive pads. These pads can either be stuck on the spring
in the box, or on the C-ASIC. If stuck on the C-ASIC, you can re-
use the pad when replacing the C-ASIC.
PCA, and push firmly until the strip is in its original position.
on the main PCA sticks through the slot in the shielding cover.
Figure 6-7. PCA Unit Assembly
Caution
ST8676.WMF