Problem with amplifier

MisterTedster · 22nd October 2009, 08:08 AM

Hey guys, I have a koiiler xm7663 4-channel amplifier with a pioneer deh6000ub hu. The issue is that one of my channels doesn't output sound a low to moderate volume. However when I turn it up I get sound to that speaker but it is really nasty, distorted, and static-y almost like a blown speaker, but worse. I know it's not the speaker, rca, or hu since I've isolated all of those and found that it was the amp. Any ideas?

amc32 · 22nd October 2009, 05:17 PM

first guess is internally in amp.

Four channel amp, 1pair output devices per channel.Cold solder joint in that channel.Emmiter resistors, pre-driver pair open or short,clean and check gain controls and all associated processors with the defective channel

MisterTedster · 23rd October 2009, 02:34 AM

Sorry I'm new to this. I assume you mean to make sure the soldering is not cracked? Also, how exactly do I 'clean' gain controls and processors?

TO-3 · 23rd October 2009, 05:42 AM

Quote:

Originally Posted by MisterTedster

Sorry I'm new to this. I assume you mean to make sure the soldering is not cracked? Also, how exactly do I 'clean' gain controls and processors?

How does the board look? Is there a bunch of dust on it? You can get a can of air and blow all the crap off of it. You can even pour a bunch of isopropyl (rubbing) alcohol on the board before you start blowing air on it. As for the pots, they can be trickier to clean. You can try and squirt some alcohol inside them, twist them several times, and blow more air into them. Brake cleaner works pretty well on pots, though, I don't know how it does with plastics.

22nd October 2009, 08:08 AM	#1
MisterTedster diyAudio Member Join Date: Oct 2009	Problem with amplifier Hey guys, I have a koiiler xm7663 4-channel amplifier with a pioneer deh6000ub hu. The issue is that one of my channels doesn't output sound a low to moderate volume. However when I turn it up I get sound to that speaker but it is really nasty, distorted, and static-y almost like a blown speaker, but worse. I know it's not the speaker, rca, or hu since I've isolated all of those and found that it was the amp. Any ideas?

22nd October 2009, 05:17 PM	#2
amc32 diyAudio Member Join Date: Mar 2008	first guess is internally in amp. Four channel amp, 1pair output devices per channel.Cold solder joint in that channel.Emmiter resistors, pre-driver pair open or short,clean and check gain controls and all associated processors with the defective channel __________________ ...............I Hear in color.................

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23rd October 2009, 02:34 AM	#3
MisterTedster diyAudio Member Join Date: Oct 2009	Sorry I'm new to this. I assume you mean to make sure the soldering is not cracked? Also, how exactly do I 'clean' gain controls and processors?