Weird La3a problem, please help.

[Matt Syson]

Hi
Get the tech to come and look at it in your studio.
Try it on a 'Variac' and reduce / increase the mains to see if it can be persuaded to misbehave.
Matt S

[sonicdom]

thanks matt

i'll get a power conditioner with constant voltage output in sometime next week to see if this helps.

cheers

dominic

[Matt Syson]

hi
Your unit is certainly faulty so a conditioner is not really a good long term solution.
As long as the mains is within plus or minus 10 percent it should work perfectly.
Borrow a unit by all means but proper repair would be better.
Matt S

[sonicdom]

hi matt

it is not intendend as a long term solution and i did try to have it repaired, but it behaved well at the 'doctor's'. i just want to find out if my power is problematic and how i can reproduce this in other places so that someone can fix it.

do you have any ideas, what the fault could be? the 110/220v switch was intermittent and thus bypassed, way before i got the unit.

since it affects the audio, the vu meter and the light, i guess it is a powersupply related problem. since it happens exactly 3 minutes after powering up, it could also be a thermic problem or some sort of feedback building up.

cheers

dominic

[David Kulka]

Maybe the I/O cables or mounting it in the rack is causing some weird problem? I'd pull it from the rack, disconnect the audio cables, then run it for a while and see what happens. If the problem recurs then maybe you should look at your AC power...but somehow I doubt that's the problem.

If the power selector was bypassed, that's a bit of a red flag. Maybe a combination of faults is causing this problem to happen at your place but not elsewhere.

[sonicdom]

thanks.

it happens in and out of the rack, audio connected or disconnected, on all the power outlets i have in the house. however, yesterday it worked for more than two hours without playing up. then i switched it off, and back on a while later. this time, after about 20 minutes, the fault was back, but in a changed appearance. when it happens now, the vu meter doesn't rock back and forth anymore, it just sinks down to -10dB gain reduction) and sits there, and the vu light isn't affected.

i'll keep an eye on it and see how it develops.

dominic