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Crest CA9 Channel A dead

Printed From: Speakerplans.com
Category: General
Forum Name: Amp Forum
Forum Description: The 'Stopping Jake Fielder moaning constantly' forum description...
URL: https://forum.speakerplans.com/forum_posts.asp?TID=107771
Printed Date: 28 March 2024 at 10:29am
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Topic: Crest CA9 Channel A dead
Posted By: Navanor
Subject: Crest CA9 Channel A dead
Date Posted: 16 March 2023 at 10:49am
Hi All,

I just got an older Crest CA9 amp. Channel B is working fine, but I don't get any output from channel A. The clip and protect LEDs don't light up. The input LED from channel A lights up the same way as the one from channel B, so I assume it's not an input issue. Anybody had any similar issues?


I also don't find the stereo/bridge switch on this amp. Is it this jumper?

Many thanks!
Nathan



Replies:
Posted By: Lucasdude
Date Posted: 16 March 2023 at 4:52pm
It is that jumper as you cann see "bridge/stereo" written on the other side of the board. If 2 red lights aren't on for 2 seconds or so when powering up then there is a fault. I would suggest you power off, leave for 10 mins or so for caps to discharge, then unplug and reconnect all of the big white cable connectors. If you are handy with such things you can try swapping the 2 amp modules over and see if the fault follows. The modules are identical, and if you can trace the fault back to a faulty one then you may be able to just post the offending one off for service and save some quids. Where abouts are you? There are a couple of excellent service chaps on this forum.


Posted By: Navanor
Date Posted: 16 March 2023 at 9:05pm
Thanks for the reply! When I power the amp on, the red LEDs light up for appr. 2 seconds for channel A & B, then they go out. Will try to unplug and reconnect the cables!
I'm from Antwerp (Belgium) 


Posted By: kedwardsleisure
Date Posted: 16 March 2023 at 9:15pm
check the speaker relays are working

-------------
Kevin

North Staffordshire



Posted By: Navanor
Date Posted: 24 March 2023 at 7:42pm
Relay of channel A is burnt. When powered, you can feel a very weak click, I couldn't even hear anything. When I power the other one, you can hear the click very clear. Do I will look for a new relay and replace it with a new one!



 Thanks!



Posted By: shaun1264
Date Posted: 25 March 2023 at 7:22pm
Looks like it had some DC across that relay under load!


Posted By: Navanor
Date Posted: 13 April 2023 at 1:32pm
Hi All, 

Relay is removed from the output module, but I'm having trouble sourcing that relay. Anybody in Europe/Belgium knows where to order it? I only found webshops who solely sell to business... It's a potter brumfield k10p-11d55-24 relay.




Posted By: valle92
Date Posted: 07 May 2023 at 10:45am
https://www.digikey.de/de/products/detail/te-connectivity-potter-brumfield-relays/K10P-11D55-24/254545



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