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ES-1 No line out and very quiet and distorted HP out.

 
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Joined: 05 Jan 2024
Posts: 1
PostPosted: Fri Jan 05, 2024 12:12 pm    Post subject: ES-1 No line out and very quiet and distorted HP out. Reply with quote
Posting this for others who may have seen this problem. Unit was in storage and developed a problem where there was no signal on the line outs and the headphone was very quiet and distorted. Problem was the turn on mute circuit was constantly held high. Q1-Q4 controls muting on the outputs. They seem to be controlled by Q6 (which is just near the Midi thru port) . No doubt the fault is caused by a failed component but without a diagram I stopped looking here. Anyways short out base and emitter on Q6 disabled the muting and everything works fine besides a small click during turn on.

Here is a link to a pic I took of the board :
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