East UniPre 4 Fading Out

[dmdavies]

Right, I've got an ACG with an Easy Uni-Pre 4k in it. I can plug it in, and play for about 15 ish minutes, and then it just fades out. Pulling the tone to passive works but when I switch it back to active, it stays off.  Removing the lead and then putting it back in fixes it for another 10 or so minutes.

 

Also, I can make it do it sometimes by pulling the Bright pot to on.

 

I thought it was the battery, but I've changed that to no avail.

 

Any ideas?

[eude]

33 minutes ago, dmdavies said:

Right, I've got an ACG with an Easy Uni-Pre 4k in it. I can plug it in, and play for about 15 ish minutes, and then it just fades out. Pulling the tone to passive works but when I switch it back to active, it stays off.  Removing the lead and then putting it back in fixes it for another 10 or so minutes.

 

Also, I can make it do it sometimes by pulling the Bright pot to on.

 

I thought it was the battery, but I've changed that to no avail.

 

Any ideas?

I'd give John East a shout, he's incredibly helpful and I'm sure he'll be able to shed some light on this for you.

[email protected]

 

Eude

[Hellzero]

Looks like a push-pull issue. Check the knobs first, yes the knobs, as they might have moved and are blocking the correct contact of the down position.

Edited November 6, 2021 by Hellzero
Past participle

[dmdavies]

I managed to fix it last night.

 

I played it with the control cavity open until it did it again. I then just poked around inside to see what impact it had. The Bass/Treble/Mid controls are all on the same pcb with pin connectors. The pins were apparently a little bit loose. It pulled them of then reseated them and it has stopped happening.

 

I took it to rehearsal this morning and played for two hours without it reoccurring.

 

Thanks for your suggestions guys!