Potato Cakes

Allen and Heath ZED12FX effects PCB connection
« on: March 11, 2021, 08:55:09 AM »
Hello, everyone,

I am looking to see if anyone here has an Allen and Heath ZED12FX that they wouldn't mind taking the underneath panel off and taking a pic of where the brown cable connects to the effects daughter PCB that sits on the channel boards. I have been modding/upgrading mine for fun (1000uF coupling caps, TLE2072A, fader make up amp adjust, etc) and somehow I wasn't paying attention when I resoldered the lead that provides voltage for the effects board and connected it to ground. It burned out the 10R resistor and blew a cap, which did what it was supposed to do. After I replaced those parts and connected it properly, it makes this snapping noise, like a clocking issue, but it is also has the effect following it. This tells me the effects part is working but there is a something else in the digital realm on that board that is not happy or was damaged. I have a replacement board coming but I wanted to double check what the connection should before I rewire it.

Thanks!

Paul


deveng

Re: Allen and Heath ZED12FX effects PCB connection
« Reply #1 on: March 12, 2021, 10:30:55 AM »
Check out my post here:
https://groupdiy.com/index.php?topic=76086.msg965825#msg965825

I was repairing a friends Zed and that brown wire to the Efx board was not even soldered when I opened the back! 

I believe your power supply and Efx pcb is the same as the 16&22 boards.  I uploaded the schematic in that post. So that light brown wire should go to the 10v pad labeled as P7 on the power supply.  If you're talking about the brown wire connection on the Efx pcb, that I don't remember where it was soldered.

Regards,
Jeff
« Last Edit: March 12, 2021, 10:34:29 AM by deveng »

deveng

Re: Allen and Heath ZED12FX effects PCB connection New
« Reply #2 on: March 14, 2021, 11:15:49 AM »
Paul,

Just remembered I took a picture of the EFX board for Ian.  It shows the connection location of the brown wire on the EFX pcb!  Same thread link as above.     On this particular EFX pcb the wire is just above TP1.
« Last Edit: March 14, 2021, 01:48:06 PM by deveng »

Potato Cakes

Re: Allen and Heath ZED12FX effects PCB connection
« Reply #3 on: March 14, 2021, 01:05:24 PM »
Paul,

Just remembered I took a picture of the EFX board for Ian.  It shows the connection location of the brown wire on the EFX pcb!  Same thread link as above.

Thanks for the link to the pic! As I had mentioned I had reconnected to the point labeled SGND and I for reason jumbled the letters in my brain to interpret that as signal, which also doesn't make sense. I reconnected the board to that point in that picture but I think I'm sure that the DSP chip is now damaged. Hopefully I will receive the replacement board this week and confirm that this was the problem.

Thanks!

Paul


 

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