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Installing the PCB and Front Panel into Case Bottom Shell
The next several steps will result in the PCB being mounted to the bottom case shell and the front panel
being screwed into place on the front of the bottom case shell.
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Begin by removing all of the standoffs from the four corners of the PCB
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Using four 4-40 X 5/16 inch pan head screws, #4 internal tooth lock washers, and 1/8 X 3/16
inch spacers, mount the PCB to the bottom of the case. The PCB is oriented such that the final
transistor is on the side of the case bottom where it will be secured in a later step. Place the
spacers on top of the pem nuts, then place the PCB down on the spacers, and carefully insert a
screw with a lock washer through a PCB mounting hole and into the pem nut. Tighten each
screw only finger tight at this point so that small adjustments can still be made.
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Place the 1/8 X 1/2 X 1 inch spacer between the final transistor tab and the case wall. Using a 4-
40 X 1/2 inch flat head screw, #4 internal tooth lock washer, and 4-40 hex nut, secure the final
transistor to the case wall.
[ ]
Once the transistor mounting screw is tight, tighten the PCB corner mounting screws. The
assembly should look like the next photo.
- Figure 72 -
51
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