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Crown CE 1000, channel 1 low output, help

waggs098

waggs098

Super Member
So I have the above amp powering my mains. Thursday I came home from work and my son was listening to music and shortly after he shut it off. I turned it back on about 30 minutes later and channel 1 had low output and sounded slightly distorted. I didn't notice it when my son was listening.

Did all the typical things like swap speakers and inputs to the amp to determine the amp was the problem. Pulled the CE 1000 out and put in a different amp and all sounded fine.

Yesterday after work I hooked the amp to some test speakers and, as I figured would happen, it works fine. Left it on for about 2 hours to get warm and played music for about an hour and no issues. When it was in my system to only thing I didn't move were the speak-on connectors at the amp so I suppose its possible there was a bad connection there but seems unlikely.

The amp hasn't had any issues previously.

Anyone had an issue like this with one of these?

I'm going to check DC offset and bias. Aside from that what else should I check? Only thing I can think to do is compare voltages to the schematic and see if anything looks off.

Thanks for reading and any help.
 
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So DC offset and bias are spot on. After I checked that I hooked speakers back up and tested and the left channel was barely audible, woohoo now I can check something.

I took a plastic screwdriver and started tapping relays and the sound got slightly stronger, tapped a couple more times and it went completely dead. Just started tapping random spots and I barely tapped the input board and the channel came in good and strong so there must be a bad connection on the input board. I will resolder some joints and test it again.

In the pic you can see some yellow tape underneath 2 components. I assume this is an insulating tape, would that be correct? I need to solder the 4 joints that are under that tape. I'll have to remove the components then take the tape off. If it doesn't restick what would be a good replacement, otherwise I could extend the legs on the 2 components and solder them raised off the board. Any suggestions?20230318_111527.jpg
 
Maybe a small dab if low temp hot glue under those caps or resistors?
I had a power amp I was working on that one channel would drop out or become much lower than the other. Bias and offset were fine. What I found was there was a small stereo/mono switch on the back that bridged the amp. I shot some contact cleaner into it, worked it back and forth 20 or more times and it's been working fine since. Does that Crown have a stereo/mono switch on the back?
 
Lavane said:
Maybe a small dab if low temp hot glue under those caps or resistors?
I had a power amp I was working on that one channel would drop out or become much lower than the other. Bias and offset were fine. What I found was there was a small stereo/mono switch on the back that bridged the amp. I shot some contact cleaner into it, worked it back and forth 20 or more times and it's been working fine since. Does that Crown have a stereo/mono switch on the back?
Click to expand...

Yep and tried messing with that first.

I think I got it fixed though by resoldering the input points on the board. I just lifted one leg of those caps and when I resolderd them I put the tape back underneath and pinched them with the part to hold it in place. Amp seems to be working fine now. It could have also been a bad connection on the ribbon cable thats plugs into the input board.
 
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