Urei 6230 amp start question.
I bought a 6230 amp and i just have a question about it: After i push the on button it takes 3 minutes for the amp to start to play. The standby lamp works and is on for 3 min and then the amp clicks and standby is off and the amp plays. Is this normal for it to take 3 min or ?
I think the amp is 17 years old and i opened it for a look and there is NO dust inside it, perfectly clean. It has been installed so there are no scratches on the front and it looks like new.
Happy new year, mats
Late answer to a very old topic...
Quote:
Originally Posted by
matsj
I bought a 6230 amp and i just have a question about it: After i push the on button it takes 3 minutes for the amp to start to play. The standby lamp works and is on for 3 min and then the amp clicks and standby is off and the amp plays. Is this normal for it to take 3 min or ?
I think the amp is 17 years old and i opened it for a look and there is NO dust inside it, perfectly clean. It has been installed so there are no scratches on the front and it looks like new.
Happy new year, mats
Hi Mats, a kind of a "late answer" for sure, but i had the same problem with my 6260, searched the net, and found this forum. So much interesting stuff in here...
You havenīt mentioned if your problem was solved, so... back to the topic: I soldered the mentioned caps out, new caps in; no changeat all!
Next step was to put a scope to the base of Q23 (the relay driver). There was some flickering before the relay was drawn. Also signs of hf oscillation around 1 MHz. My guess was problems of leak current from the caps around the schmit-trigger IC2C, and unstability in the 7815/7915 regulators. So i changed C35 and C13 to new caps, and soldered 100 nF micas on the back side of the pcb on C28 and C30.
Problem solved. I canīt tell if leaking caps or the oscillation (or both) was the cause.
Regards, Bo.
One Problem Leads To Another?
I paid an "Authorized JBL Pro Repair Center" to "fix" the same problem in one of my 6260s. They recapped the low voltage supply. The amp ran "back to normal" through the warranty period. Then, it developed an un-listenable hum problem when connected to any signal source. It does not hum with nothing connected to the inputs. I would appreciate any thoughts or shared experiences.