[Bartok]

Hello, 

I own this compressor about a year. From a few days to now, it has started to make a “click” noise when I pulse the “Off” button, for bypass the compressor. The compressor is in a Radial “The Cube” Workhorse, with a MP573 and a EQ573.

What could be wrong? It doesn’t happen before. Could it damage something on interface, headphones or the compressor itself?

Best!

[JPK]

The clics often come from a DC voltage added to the signal.
The DC voltage cannot come from the CP5176 because the circuit is isolated between 2 transformers.
Try to disconnect the input of the compressor and check if you still get the clicks.
In such a case the issue may come from another equipment place before the compressor.

[Bartok]

Hello, JPK, and thank you for your help with this matter.

As I said, the CP5176 is in a Radial Workhorse "The Cube", with a MP573 & EQ573. "The Cube" has in its rear side two "feed" selectors (for passing the signal through the modules without using a cable) and two "link" selectors (for use the modules in stereo mode).

I have disconnected the input to the CP5176 and it still make "clicks". I have notice that, if I "don't feed" the modules and I use cables for each module, the "click" only appears when I bypass the compressor. It is lower, but it still appears...

Any thoughts, JPK? 

[Bartok]

[JPK]

The clicks may also be induced by the voltage spikes in the relay coil.
Check the solder joints on D1, C19, C20, SW2.
Check that D1 is OK. 
You can also try to replace C19 & C20 and maybe SW2.