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Build help and troubleshooting => LA502 Optical Compressor => Topic started by: Pierre on February 27, 2022, 03:34:16 AM

Title: No compression
Post by: Pierre on February 27, 2022, 03:34:16 AM

Hello,
I have no compression when i turn the peak button. The gain button works good, the leds and other knobs works good too, i can visualize on the leds the compression amount, but by ear, there is no difference. I test everything, the only issue was a little solder bridge near r2 and r3, and i fix it. 
I don't know how to fix this compressionr problem, thanks for your answer

Title: Re: No compression
Post by: JPK on February 28, 2022, 09:09:27 AM

Make sure you didn't reverse the optical coupler OC1.
Check your solder joints on OC1, P3, R33.
Check continuity between OC1 LED+ pin (bottom low) and U6-pin7,

Check continuity between OC1 LED- pin (bottom high) and U6-pin6,
Check continuity between OC1  RES1 pin (top high) and R4 right,
Check continuity between OC1  RES2 pin (top low) and 0V.
If all is OK then you may have a defective optical coupler (rare). Contact me here (https://www.soundskulptor.com/en/content/6-contact) and we will send a replacement.

Title: Re: No compression
Post by: Pierre on March 02, 2022, 11:27:54 PM

;D;D;D Cool !! It Works perfectly now ! It was just one bad solder in R33 … big big thanks JPK for your help! I hope i’ll don’t need help for the next kit!!!