Crest VS 900 problems

[Burnedfingers]

Hi

I have a Crest VS 900 amplifier that has developed a rather nasty problem. It has a positive waveform clip and goes into protection upon signal being applied to either channel. It seems to have a DC offset problem also. If the signal is applied very very slowly I can get several volts out into the 8ohm load before it goes into protection. The positive waveform is totally clipped and the negative is fine. I cannot get a schematic for it so I am asking if someone has had experience with one of these. There seems to be a STK module in the circuit that I assume is part of the front end, but this is a guess.


Any thought here would be appreciated.

Thanks
Joe

 

[ChocoHolic]

ReHi!

...might be an issue with the power supply.
Did you check the internal voltage rails?

Good luck
Markus

 

[Burnedfingers]

Hi Markus

Just finished rechecking the power supply with no fault found. I suspect the STK 3152 module is bad.

Joe

 

[SS64]

I know this a old old post, But I just picked up a 900 that only one channel seems to do this. Channel b seems to clip early and if more drive is applied the amp goes into protect. What is the problem?

 

[djk]

Replace the STK 3152, most common problem with this amplifier.