I've Got an amp that's on the fritz,any thoughts?

[bri1270]

I've tried swapping cables, that does nothing, however, using a different amp there is no noise.

Also, I disconnected the fan, and I could clearly hear what sounds like the part in Frankenstein when they're trying to bring the monster to life and the elcetricity is building up between the two conductors until it reaches the top and is then released, and starts all over again at the bottom...(sorry best analogy I could think of). And with a speaker connected, I can hear it in the speaker. There's no crackle or anything, it just seems to cycle through this build up.

Lastly, it's only audible on one channel.

Any thoughts?

Thanks,
Brian

[brady]

What amp do you have? I have a crown xls 602 and the problem seems similar, it finally got bad enough to keep tripping the fault light It's been in the shop now for two months (not many shops fixing pro amps in MN) I hope to get it back soon and will post what they find

If you figure out whats wrong please let us know thanks

[bri1270]

It's an Alto Macro 1400. If I bother to get it fixed or looked at, I'll let you know.

[brady]

Well, I finally got the amp back yesterday(crown xls 602). The repair tech replaced a bad power supply and various bad solder joints. He was surprised because this is something you normally see with amps used in bands with amps that get tossed around and are subject to a lot of vibration, he's been doing this for 20 years so has seen his share of use and abuse

Something strange happened last night after watching a movie. I turned the amp back on and heard the fan start for a split second, then I tried again and the same thing, a very brief fan sound. This doesn't make sense since I snipped the fan wires when I bought the thing.
Today I will open it up and check it out, the tech said nothing about the fans

[ThomasW]

Bad power supply I can understand. Bad solder joints are a sign that it wasn't assembled properly in the first place.

The tech would have repaired the cut fan wires. Otherwise the unit wouldn't be covered by warranty. You're lucky he didn't ding you for repair costs given that you cut the wires..

[brady]

He charged me 150.00 for the repair, this wasn't a crown tech, just a local pro audio repair shop. I didn't make a warranty claim because as you said any mods will void it. One thing I forgot to mention, he asked me if I bought it on ebay, I told him I thought I did but another customer came in so I never found out just what he meant by that