Overwatch - Hardware - Daughter board installation
Many EQSS Overwatch kits contain daughter boards. Correct installation is critical to reliable performance.
The correct fitment of these daughter boards is crucial to the reliable operation of an Overwatch system. This Tech Doc is an addition to the instructions within the EQSS Overwatch Installation Manuals, and is intended to highlight the importance of good preparation and correct PCB pad dressing. If the preparation was done poorly, the Overwatch simply will not function reliably.
Example of an EQSS Harness and Daughter Board
Steps:
First clean mechanically all solder joints where the EQSS Overwatch Daughter board spring pins will connect to the scissor control board. All glue/silicon/conformal coating must be removed to properly expose the solder joints. Then the control board contact points must be cut back with electronics side cutters until they are flush.
Use a fine, sharp pair of angled side
cutters to trim down the PCB pin contact points.
Ensure the pins are cut flush with the PCB to allow the Overwatch daughter
board spring pins to make suitable and
secure contact.
The photos below should be used as a guideline to ensure reliability in the final assembly.
When all preparations have been completed for the attachment of the daughter board, the bolting down of the daughter board onto the scissor control board can be finalized.
To assemble - use whatever method is easiest for you, but DO NOT USE SUPER GLUE to hold down the spacers during assembly, as most likely it will also end up on the spring loaded pins - rendering them non usable. When all spacers and screws are mounted loosely in place, gently wriggle the daughter board until satisfactory seating of the daughter board spring pins is achieved. Then carefully and evenly complete the tightening of the screws. When all screws have been tightened, carefully check that the spring pins are making good contact with the control box PCB.
An example of a properly mounted daughter board
Example of what not-to-do (Super Glue over the spring pins and over tightening)
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