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Edited by morgan_flint at 2023-9-19 16:47
PROBLEM SOLVED
The failure was caused by a faulty rotary encoder that, due to bad design, had one of its terminals short-circuited to the case and, hence, to ground, blocking not only its signal but that of the rest of the encoders, as they all share the same row in the front panel scanning matrix.
Technical details here, and the initial debugging of the problem in the posts from here at the same thread.
Basically, you have to detect which of the encoders have the problem checking continuity form both sides to ground and then replace it or repair it with some isolation tape.
BTW, this problem not only affects the DSO2000 series but also other models that share the same type of encoders and user interface scanning solution. In fact, the video that describes the problem and its solution is for a DSO5202P.
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