Service manual

PT300, Service Manual
Rev B, October, 2000
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Figure 13 Load Cell Placement
1) Remove all 10 bezel screws.
2) Detach keyboard assembly and set aside. Do not unplug keyboard.
3) Remove 2 screws holding circuit board.
4) Remove main circuit from housing.
Do not set the board on any conductive surface, including the scale.
5) Rotate summing board until potentiometer is accessible.
6) Turn scale ON.
7) Wait for scale to warm up.
8) Zero the scale.
9) Apply 5000 lb load to load cell #1 and record weight
10) Record displayed weight.
11) Apply a 5000 lb load to front load cell using loading block.
12) Adjust displayed weight to middle of front and back weight values.
13) Repeat steps 8 through 12 until there is no more than 1 division difference
between the front and back cells.
14) Apply Torx-seal to lock the potentiometer shaft.
15) Return summing board in housing.
16) Place circuit board into housing. Be careful not to pinch the wires between