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Old 7th August 2020
Here for the gear

Originally Posted by David Kulka View Post
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.
If the are nothing connected at the back, the db25 is out. inserting a TT jack and meassuring that the ground the cold are touching, the same TT jack works on other channels.

Is there a way to get inside the patch to see if something is wrong there?
so It could be on the db 25 connector as well, one of the pins on the bay is touch, or the tt connector?