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McGooserton
McGooserton's picture
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Last seen: 1 year 3 months ago
Joined: Jun 27 2012 - 7:50am
Why is the DC protection for my stereo amp coming on regularly?

 

My 4 year-old Cambridge azur 540A has CAP5 protection circuitry that shuts off the amp when it detects high constant voltage. 

 

It kicked in maybe once or twice a year before, but in the past couple months it's been several times a week. I have to unplug the amp from the back every time. What might be causing the high voltage? I may have done a poor job of stripping the speaker wire and pulled out too many wire strands--would that affect the voltage?

 

McGooserton
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Last seen: 1 year 3 months ago
Joined: Jun 27 2012 - 7:50am
It almost always happens when

It almost always happens when powering on the amp.

JoeE SP9
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Last seen: 2 weeks 5 days ago
Joined: Oct 31 2005 - 6:02pm
DC protection

The DC offset on your amp is probably off. If you can't adjust DC offset yourself you need to get it to a competent technician.

commsysman
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Last seen: 7 hours 2 min ago
Joined: Apr 4 2006 - 11:33am
AMPLIFIER

In all probability, one of the power transistors has failed or is going bad. That is the likely culprit.

Send it in for service.

McGooserton wrote:

 

My 4 year-old Cambridge azur 540A has CAP5 protection circuitry that shuts off the amp when it detects high constant voltage. 

 

It kicked in maybe once or twice a year before, but in the past couple months it's been several times a week. I have to unplug the amp from the back every time. What might be causing the high voltage? I may have done a poor job of stripping the speaker wire and pulled out too many wire strands--would that affect the voltage?

 

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