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Build help and troubleshooting => CP4500 Stereo Bus Compressor => Topic started by: MRMNW on October 26, 2026, 01:29:32 PM

Title: Make up gain no longer working
Post by: MRMNW on October 26, 2026, 01:29:32 PM

Hi,
The unit has been working fine up until recently, now the makeup gain does nothing. 

I'm getting a reading of -1.42v at TP12 as per step 1.2 on the voltage checks and it doesn't change when moving the makeup gain on step 1.3.

Any help appreciated

Thanks

Title: Re: Make up gain no longer working
Post by: JPK on October 26, 2026, 05:24:59 PM

Check if the center pin of P2 (makeup) goes from 0 to +12VDC when moving.
Next check that this voltage reaches R90 and U22 pin7 (with less amplitude 0-2V4).