Author Topic: Comp not engaging when ‘in’

August 08, 2023, 12:20:25 AM
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radar.rohan

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Hi!

My compressor after working fine for a year + started behaving strangely. 

Now when the compressor is ‘in’ it passes signal and meters fine but the comp seems bypassed. 

When I first noticed this it was intermittent and I had some strange behaviour with the gain pot. But now it just seems dead.

The unit looks like it’s working and I hear the click when I hit the in button. But signal remains unaffected.

You actually helped set this unit up and did a basic repair when I first built it as I had the meter spade connectors attached the wrong way.

Thanks in advice for your help!

August 10, 2023, 05:33:33 PM
Reply #1

JPK

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Does the makeup potentiometer increases the output level?
JPK

August 17, 2023, 03:24:27 PM
Reply #2

radar.rohan

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No it acts as if it were bypassed. 

Though I did have it briefly engage when turning the gain pot. But only for a second. Behaviour I haven’t been able to repeat 

August 17, 2023, 05:02:49 PM
Reply #3

JPK

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The unit stopped compressing on both channels at the same time, right?
Check if you get some side chain signal on TP11. It is a negative going DC level which reflects the input amplitude.
Then check if it is also present on TP12, added to a voltage controlled by the makeup pot.
JPK