Author Topic: EQ573 II - Low band

March 15, 2021, 04:31:25 pm
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Dolbah

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Hi
I cant't find dedicated tread for the EQ573 II , so i'll put my question here.

I bought 2 of these, one is working perfect but the other seem to have problems with the low band.

When turning the red knob from "Off" to "20" or any other value, the bass frequencies gets turned down and twisting the black knob or red knob results in no significant reaction to the spectrum.

Since i have two units, i have tried switching the main boards between the fronts paneles, and the problem does not follow the main board. The issue should therefore sit in one of the front panel boards.

So, i have checked everything visually, and cant find any issues.
But, these darn Film capacitors that are placed close in a row on the front panel PCB. The middle ones are impossible to check. Could this symptom be a result of one of the film capacitors being missplaced? i rather ask, before i start desoldering to check them.





« Last Edit: March 15, 2021, 04:35:21 pm by Dolbah »

March 15, 2021, 08:14:55 pm
Reply #1

Dolbah

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Update: Might have figured it out.
I managed to lose track of my knife when cutting the PCBs apart

The knife made a big scratch, and thought it was only cosmetical, but it wasnt.

I will try do make a wire-bridge to fix it and test later


March 16, 2021, 08:21:18 am
Reply #2

JPK

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There is absolutely no need of a knife to split the PCB's.
You have probably cut a track between P2 and J7a.
JPK

March 16, 2021, 03:33:49 pm
Reply #3

Dolbah

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There is absolutely no need of a knife to split the PCB's.
You have probably cut a track between P2 and J7a.

Ha, now you tell me ;D i've been afraid to break the PCBs earlier, so i've used a knife to make them separate easier.

Yes! Thats the one. 
I just scraped the circuit open on both sides of the "knife wound", and added som fluss and a dash of solder on it. Filled right up.

All good now.

side question: I manage to fuch up the threads on one of the red knobs. It sits now, but if i ever need to take it off, i might not get it back on. Are there any place i can buy replacements?



March 17, 2021, 09:08:39 am
Reply #4

JPK

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Send me an email here.
JPK