Question about Crest Audio Audio Players & Recorders
Oversensitive ACL/IGM progressively became more sensitive over time. Now does not run more than a minute before e tripping protect relays.
Posted by Anonymous on
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Posted on Jan 02, 2017
The power transformer is getting short and overheated causing it to go in thermal protection mode.Also if the amplifier gets overladed by its connection, it goes to thermal mode.
The problems i have seen most often in Crest amplifiers is bad capacitors. They look fine from the outside but pull one out of circuit and measure it and there bad. These are the small electrolytic types. there are 2 sets of solid white wires from each output module to the output relays. Inject a a signal into the amp and take a look at the signal on those white wires. If the signal looks clean with minimal DC offset then you have bad caps causing it to stay in thermal protect. A very common crest amplifier problem.
Check in between the heatsink's. These amps have a tendency for those heatsinks to arc across the sinks. There are only 2 thin rails that hold the modules and rough tour duty service can cause those rails to bend and the sinks to touch and arc. Even a bug getting between the sinks can cause them to arc if the amp is running hard!
Also look for open resistors. This are possibilities, that can cause the amplifier to remain in thermal protect mode. ------------- This should help.Thanks.Helpmech.
Posted on May 31, 2011
You could use the EQ but it won;t sound as good as it will with a pre amp and also could make it a bit trickier when adjusting the volume and getting it to sound right.
Posted on Mar 10, 2012
Testimonial: "Thank you very much. I wouldn't like to mess up my Bose. So I guess It's better to buy a PREAMP and then connect accordingly. Once again, thank you for your time and concern , oh, and your most valuable information."
Tips for a great answer:
Dust in the unit - clean with Canned air like a computer.
or Delamination on the printed circuit board.
Don't forget to clean all contacts on the backside of the unit!
If cleaning doesn't work - head to the local Crest "AUTHORIZED" Service Center.
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