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Old 22nd January 2005, 12:09 PM   #1
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Default Crown CE 2000 Help

I have a Crown CE 2000 power amplifier with a problem. It goes in and out of protection in both channels with a load connected. With the load disconnected the amp stays out of protection. The load has been checked with an impedance meter and is not the fault.

Any ideas before I rip and tear?
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Old 22nd January 2005, 11:06 PM   #2
anatech is offline anatech  Canada
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Hi burnedfingers,
Have you checked for oscillation? I'm guessing you have ruled out DC offset.
-Chris
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Old 22nd January 2005, 11:37 PM   #3
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Chris

Thanks for the reply. Yes, I checked the Dc offset and it was normal. I'm not thrilled with Crown amps so you could say I'm trying to get my confidence up to look at it. Can't run a signal thru it because the relays keep going out. Haven't ruled out oscillation as of yet. Heatsinks are cool so that would probably be a positive.


Joe
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Old 23rd January 2005, 12:45 AM   #4
anatech is offline anatech  Canada
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Hi Joe,
Hang a 'scope on the output before the relay. Watch for oscillation. You may even find that the protection circuit is defective (caps). If this is the case, the supply bypass caps would be good to look at.
-Chris
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Old 23rd January 2005, 03:01 AM   #5
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Chris

Thanks for the tip. I will check it out tomorrow and let you know what I find.


Joe
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Old 24th January 2005, 03:42 AM   #6
Enzo is offline Enzo  United States
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And you might contact CRown, not only for service materials/schematics, but also for their support. You may find they are aware of some circumstances where the amp might behave this way and have a fix for it.
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Old 24th January 2005, 08:03 AM   #7
moamps is offline moamps  Croatia
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Hi,

check also DC protection circuitry (triac Q131-MAC9D and elco C123 100uF/16V)

Regards,
Milan
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Old 24th January 2005, 11:18 AM   #8
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I found the problem.

Unfortunately it is a surface mount part and I don't have the equipment to change it so off to Crown it goes.

Thanks for your suggestions and help.
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Old 24th January 2005, 11:53 PM   #9
anatech is offline anatech  Canada
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Hi Joe,
You know what I use for smt stuff? A solder pick, solder wick, flux, a wide tip and a magnifying glass. Works well for everything. Just don't sneeze (I have, still haven't found those parts).
I have even had to re and re smt parts, you know the really big chips with leads all the way around? (Korg no have parts yet at the time). And the stuff even worked!!
-Chris
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Old 25th January 2005, 11:08 AM   #10
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Chris

Thanks for the reply. I'm sure you are much more apt to have a steady hand than I am. Thirty years ago I would have tried your method. Unfortunately I am a little too unsteady to try it now.
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