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Old 7th August 2020
Lives for gear

With all external cables disconnected, use an ohm meter to measure resistance between ground and cold on your problem channel. If your meter indicates a short, or anything other than a fully "open" condition, do a careful visual inspection of both the DB25 and the TT jack. It might be a solder blob, mashed wire, a small part that fell into the bay, reversed wires, bent contact, etc.