Sound Skulptor forums

Build help and troubleshooting => EQ573 Equaliser => Topic started by: Dolbah on October 10, 2024, 05:29:33 PM

Title: High pass not working EQ573-II
Post by: Dolbah on October 10, 2024, 05:29:33 PM

High pass stopped working on my EQ573-II. I have two units, and switched the mainboard between them. The problem follows the mainboard.

When turning the knob the sound just flickers on each step, but no  noticable change in the frequency spectrum. 

Any idea where to start? I have reflowed all nearby joints and then some.

Title: Re: High pass not working EQ573-II
Post by: JPK on October 11, 2024, 11:27:05 AM

Maybe a bad solder joint on inductor L1.

Title: Re: High pass not working EQ573-II
Post by: Dolbah on October 12, 2024, 07:09:56 PM

Thanks! I actually misinterpreted the problem, by testing a tone with to little lowend. The actuall problem is that the unit that did not react as originaly described. actually is ok, but the other one is shaving off 3dB on all highs, when set to Hipass 360. It gradually lowers for each step on the high-pass.

(https://i.postimg.cc/FFP2vxbD/Screenshot-2024-10-12-at-19-11-11.png)

Title: Re: High pass not working EQ573-II
Post by: JPK on October 16, 2024, 03:59:42 PM

Check the values and solder joints of R26, R27, R9, J6a, J6b, C13...C22, L1, RN1, RN2.

Title: Re: High pass not working EQ573-II
Post by: Dolbah on October 17, 2024, 08:29:52 PM

Quote from: JPK on October 16, 2024, 03:59:42 PM

Check the values and solder joints of R26, R27, R9, J6a, J6b, C13...C22, L1, RN1, RN2.

thank you! it was somewhere on that route :) All ok now