Staff Answer
Sep 27, 2026 - 11:42 AM
If the board's relay is clicking but the inside panel stays dark with both 120V and 12V present, check the ribbon cable between the boards first. Then it's either the optical (front) board or the power board. For the N843, the power board is the 628661 power board or the Dinosaur 6212XX. The optical board is the 628976/637780, which is discontinued.
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