Anyone here an Amp Mechanic? ;)

joeybutts · 25th September 2010, 04:45 AM

Found a Velodyne SPL-800 Series II subwoofer on craigslist for $35. Only problem is it won't turn on supposedly. It has a Class D digital amplifier.

I'm thinking this is a valid risk given the 1000W RMS amp...... Could always retro the enclosure if it is in good shape, but if I could fix the amp, what a steal....

any thoughts?

Pafi · 25th September 2010, 08:44 AM

I repaired an SPL-800R, but it was a real nightmare to disassemble the power module. I could do it only in a destructive way, 2 days needed for restoring. The reason of the fault was 3 pcs of dry electrolite caps. These amps runs directly from rectified mains voltage, so if you don't have experience in this, don't risk!

joeybutts · 25th September 2010, 12:00 PM

hmmmm.... Thanks Pafi.

I'd be willing to ship in the US48 to fix if anyone is interested.

joeybutts · 29th September 2010, 02:54 AM

Subwoofer is now in my possession. If anyone thinks they can help, it's appreciated.

http://forum.edesignaudio.com/showth...0.html?t=73760

bob91343 · 29th September 2010, 03:32 AM

I am in Los Angeles, so if you are local I wouldn't mind taking a look. But if you have to ship it, forget it.

joeybutts · 29th September 2010, 03:41 AM

I don't mind shipping it. It's actually the lightest plate amp I have ever held. If you feel up for it let me know and thanks!

I'm getting ~120V at both boards, and there is ~ -18.63V DC on the outputs which doesn't change with subwoofer volume change.

bob91343 · 29th September 2010, 05:35 AM

Do you have a schematic or service manual? I hate working with my eyes shut.

Some of these amplifiers have to be given a signal before they will turn on. Check the manual.

joeybutts · 29th September 2010, 11:11 AM

I don't

I did have a signal running to it just in case...

I'll see if I can find a schematic..... Thanks bob!

joeybutts · 4th October 2010, 03:28 AM

Pics of internals. Only one thing my novice eyes see. Two of the solder joints look dark. Other than that I don't "see" anything wrong and have no idea where to start with the dmm.

Also, the aluminum cage can't be removed without desoldering two chips that pass through the holes, which I don't have the equipment for.

25th September 2010, 04:45 AM	#1
joeybutts diyAudio Member Join Date: Mar 2008	Anyone here an Amp Mechanic? ;) Found a Velodyne SPL-800 Series II subwoofer on craigslist for $35. Only problem is it won't turn on supposedly. It has a Class D digital amplifier. I'm thinking this is a valid risk given the 1000W RMS amp...... Could always retro the enclosure if it is in good shape, but if I could fix the amp, what a steal.... any thoughts?

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25th September 2010, 08:44 AM	#2
Pafi diyAudio Member Join Date: May 2004 Location: Budapest	I repaired an SPL-800R, but it was a real nightmare to disassemble the power module. I could do it only in a destructive way, 2 days needed for restoring. The reason of the fault was 3 pcs of dry electrolite caps. These amps runs directly from rectified mains voltage, so if you don't have experience in this, don't risk!

25th September 2010, 12:00 PM	#3
joeybutts diyAudio Member Join Date: Mar 2008	hmmmm.... Thanks Pafi. I'd be willing to ship in the US48 to fix if anyone is interested.

29th September 2010, 02:54 AM	#4
joeybutts diyAudio Member Join Date: Mar 2008	Subwoofer is now in my possession. If anyone thinks they can help, it's appreciated. http://forum.edesignaudio.com/showth...0.html?t=73760

29th September 2010, 03:32 AM	#5
bob91343 diyAudio Member Join Date: Mar 2010	I am in Los Angeles, so if you are local I wouldn't mind taking a look. But if you have to ship it, forget it.

29th September 2010, 03:41 AM	#6
joeybutts diyAudio Member Join Date: Mar 2008	I don't mind shipping it. It's actually the lightest plate amp I have ever held. If you feel up for it let me know and thanks! I'm getting ~120V at both boards, and there is ~ -18.63V DC on the outputs which doesn't change with subwoofer volume change.

29th September 2010, 05:35 AM	#7
bob91343 diyAudio Member Join Date: Mar 2010	Do you have a schematic or service manual? I hate working with my eyes shut. Some of these amplifiers have to be given a signal before they will turn on. Check the manual.

29th September 2010, 11:11 AM	#8
joeybutts diyAudio Member Join Date: Mar 2008	I don't I did have a signal running to it just in case... I'll see if I can find a schematic..... Thanks bob!

4th October 2010, 03:28 AM	#9
joeybutts diyAudio Member Join Date: Mar 2008	Pics of internals. Only one thing my novice eyes see. Two of the solder joints look dark. Other than that I don't "see" anything wrong and have no idea where to start with the dmm. Also, the aluminum cage can't be removed without desoldering two chips that pass through the holes, which I don't have the equipment for.

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