repairing Event 20/20bas active speakers

groovebot · 17th May 2010, 11:39 PM

I'm gonna attempt repair on my Event 20/20bas active speaker.

Intermittently, the sound gets really quiet. flip the power OFF and the sound is at full volume before it slowly fades out again.

So i guess it has something to do with the power supply section.

when the power switch is on, it allows some kind of backflow, but when it is off, all the charge in the main capacitors is discharged through the amp circuitry?

so I'm just trying to figure out which component has failed and is allowing the current leakage.

Schematic attached.

MikeHunt79 · 18th May 2010, 11:52 AM

Hi, I don't have experience with that specific model but I did have a pair of Event TR8 speakers and one of them completely stopped working. It turned out the LM3886 was bad, most likely because of the almost non-existent heatsink! Some severe cost-cutting with this model...

I've not replaced all of the Event circuitry with a Class-D amp now, and the speakers now sound a lot nicer with better dynamics.

So, I would check the voltages going into the amp, and see if they are dropping when the volume is turned up, I would be more likely to suspect the amp than the power supply myself.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Anyone have a service manual or schematic for an Event TR8 active speaker?	MikeHunt79	Chip Amps	20	2nd December 2011 01:44 PM
20 channels system (with active cross over)	knc	Digital Line Level	12	7th October 2008 07:07 PM
Event 20/20bas - replace old LF Drivers?	casimer	Multi-Way	1	5th February 2008 11:56 AM
repairing Yamaha NS-690 II speakers	TimboW	Multi-Way	14	1st November 2006 02:16 AM
Repairing and modifying speakers	Hayden	Multi-Way	9	3rd July 2005 02:12 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

18th May 2010, 11:52 AM	#2
MikeHunt79 diyAudio Member Join Date: Aug 2003 Location: Bristol, UK	Hi, I don't have experience with that specific model but I did have a pair of Event TR8 speakers and one of them completely stopped working. It turned out the LM3886 was bad, most likely because of the almost non-existent heatsink! Some severe cost-cutting with this model... I've not replaced all of the Event circuitry with a Class-D amp now, and the speakers now sound a lot nicer with better dynamics. So, I would check the voltages going into the amp, and see if they are dropping when the volume is turned up, I would be more likely to suspect the amp than the power supply myself.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)