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Channel 1 on my D150A power amp has gone quiet
Andyzeg
Posts: 2
Hi Folks, newbie here...I recently bought a pair of Crown D150As (one badged Amcron) and a Straight Line Two.
After about an hour's total play over a few days, on the Crown badged amp, all sounding great, the left channel suddenly stopped...here's the symptoms -
I checked all possible connections...all seem fine
Symptoms -
* On switch on...sends a thump thru the speakers...still does. Other amp does not.
* when it was working, it ran hot. Casing above transistors was hot.
* worked fine on both channels using a CD player...then I connected a tape recorder...pressed "Tape 1" on SL2...it worked fine for a minute...then channel one went quiet.
* tested again with CD...right channel 2 is fine...but when this channel is turned down, and channel 1 turned up...there is sound/music...but just a whisper...so somehow it's lost almost all amplification on Ch1.
I did a basic check (you tube video help) on all the main transistors using a multimeter...they all seemed to give similar/matching results...but I'm not a techie...so I've no idea if the results are significant or not. My gut tells me it's a duff capacitor somewhere...but that's as far as I got.
The other power amp is working ok...so it's not the SL2. I do have the manual and service manual for the D150a.
Any suggestions, advice, help would be most welcome. I'm in the UK, Scotland btw.
Thank you in advance
Andrew
After about an hour's total play over a few days, on the Crown badged amp, all sounding great, the left channel suddenly stopped...here's the symptoms -
I checked all possible connections...all seem fine
Symptoms -
* On switch on...sends a thump thru the speakers...still does. Other amp does not.
* when it was working, it ran hot. Casing above transistors was hot.
* worked fine on both channels using a CD player...then I connected a tape recorder...pressed "Tape 1" on SL2...it worked fine for a minute...then channel one went quiet.
* tested again with CD...right channel 2 is fine...but when this channel is turned down, and channel 1 turned up...there is sound/music...but just a whisper...so somehow it's lost almost all amplification on Ch1.
I did a basic check (you tube video help) on all the main transistors using a multimeter...they all seemed to give similar/matching results...but I'm not a techie...so I've no idea if the results are significant or not. My gut tells me it's a duff capacitor somewhere...but that's as far as I got.
The other power amp is working ok...so it's not the SL2. I do have the manual and service manual for the D150a.
Any suggestions, advice, help would be most welcome. I'm in the UK, Scotland btw.
Thank you in advance
Andrew
0
Answers
Thank you