Crest VS 900 problems

Original Burnedfingers · 4th April 2004, 02:20 PM

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 · 4th April 2004, 06:01 PM

ReHi!

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

Good luck
Markus

Original Burnedfingers · 4th April 2004, 07:20 PM

Hi Markus

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

Joe

SS64 · 30th January 2012, 11:05 PM

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 · 5th February 2012, 08:41 AM

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

4th April 2004, 02:20 PM	#1
Original Burnedfingers diyAudio Member Join Date: Nov 2002	Crest VS 900 problems 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

30th January 2012, 11:05 PM	#4
SS64 diyAudio Member Join Date: Mar 2008	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? __________________ It isn't fun unless it can kill you!

5th February 2012, 08:41 AM	#5
djk diyAudio Member Join Date: Feb 2001 Location: USA	Replace the STK 3152, most common problem with this amplifier. __________________ Candidates for the Darwin Award should not read this author.

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4th April 2004, 06:01 PM	#2
ChocoHolic diyAudio Member Join Date: Dec 2003 Location: Munich	ReHi! ...might be an issue with the power supply. Did you check the internal voltage rails? Good luck Markus

4th April 2004, 07:20 PM	#3
Original Burnedfingers diyAudio Member Join Date: Nov 2002	Hi Markus Just finished rechecking the power supply with no fault found. I suspect the STK 3152 module is bad. Joe

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