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repairing Event 20/20bas active speakers
repairing Event 20/20bas active speakers
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Old 17th May 2010, 11:39 PM   #1
groovebot is offline groovebot  United States
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Question repairing Event 20/20bas active speakers

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.
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File Type: jpg BASv1_Schematic.jpg (391.8 KB, 212 views)
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Old 18th May 2010, 11:52 AM   #2
MikeHunt79 is offline MikeHunt79  United Kingdom
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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.
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Old 2nd February 2018, 07:28 PM   #3
jayrope is offline jayrope
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Default Service Manual?

Groovebot, just only found this thread after blowing one of my 2020 bas v1.

In fact i still hear the tweeter, but the bass is gone. Would you happen to have a complete service manual? Your schematic already help a lot (i suppose) but that thing won't open and i hope for some wisdom from the Service Manual...

Thanx for any advice!
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