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Old 5th June 2005, 11:31 PM   #1
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Unhappy Soundcraftsmen 900X2



Just Bought a Soundcraftsmen 900X2. It worked fine for a test but in my first show it started cutting in and out and died.
There is no output anymore. PS looks ok, input works and clip lights light with enough signal. I'm guessing something with the protection circut. The whole system blew the house circut breaker before we moved it to another circut. I hope that wasn't it.
No dc on output. Anyone got a schematic?
One thing I noticed is the relays do not engage on turn on. Since it's not returnable.....I could use a little help. Will start checking all the mosfets out of circut however initial tests look o.k.
Does this amp have that wierd problem where certain RF will shut it down. I vaguely read about that problem somewhere.

Thanks
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Old 6th June 2005, 12:35 AM   #2
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This is the same circuit as the PCR-800. with beefed up power supplies . My schematic sheet lists the 900x2 amp as well.

If the clip lights arent full on and you get normal clip lights with enough input, then this should be an easy fix as most likely the amp is still working correctly and something in the protection circuit is bad. the clip lights are very sensitive and any amount of dc offset or distortion makes those lights light up.

I will say, these amps are not quite as tough as they make them out to be. a good old QSC will beat the pants off one of these hands down for reliability anyday. these were designed as home stereo amps and they were trying to crossover a bit into the MI market i think. there good for light weight DJ use but dont beat on them.

I posted schematics for the PCR-800 online here a while back i think.


Zc
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Old 6th June 2005, 01:52 AM   #3
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I just found some photo's of the inside of this amp. it is not the same as a PCR-800, but may be similar.

Zc
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Old 6th June 2005, 01:53 AM   #4
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Old 6th June 2005, 01:55 AM   #5
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Old 6th June 2005, 06:33 AM   #6
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Thumbs up Thanks

I think I found one print but it the quality is rather bad.
The amp you pictured is prettier than mine. It almost looks like someone pulled the molex connectors and used blue heatshrink
and hardwired the cables in. I'll compare them anyway.
I bought it to drive subs but it looks like I may have made a mistake.
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Old 11th June 2005, 12:03 AM   #7
oPossum is offline oPossum  United States
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The 900x2 is very similar to the ProPower 8 - it may even be identical. I have one of each, but have not compared the modules side by side. I have some hand drawn schematics of the ProPower 8 available here .

The problem with your amp may be as simple as a bad connection between the power supply and protection boards. It may be that the protect board is not getting power, so it is unable to turn on the relays to connect the speaker to the amp.

Zero Cool: Where did you find those pictures? My 900x2 looks exactly like that! The connections are soldered rather than using push on connectors. I assumed the previous owner did it, but maybe is was that way from the factory.
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Old 13th June 2005, 11:42 PM   #8
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Thanks, that may help.
If I get it going again I'll probably have to beef it up for road use.
I'll let you know.
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Old 14th June 2005, 12:03 AM   #9
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Quote:
Originally posted by oPossum


Zero Cool: Where did you find those pictures? My 900x2 looks exactly like that! The connections are soldered rather than using push on connectors. I assumed the previous owner did it, but maybe is was that way from the factory.
I collected those photos from Ebay.

Zc
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Old 11th July 2005, 06:35 PM   #10
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Default Soundcraftsmen 450X2

I have clip lights on full, loud buzz, and internal circuit breaker trips. Smells like something is horted. Any ideas?
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