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Old 6th February 2010, 06:43 PM   #1
fbc is offline fbc  United Kingdom
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Default Phoenix gold xs2300 - advice needed for repairing

I've just got a phoenix gold XS2300 off ebay and it doesn't work

I wired it up to some 6x9's i had lying around to test it, the power light comes on ok but the sound coming out of the speakers (one more than the other) was fierce crackling. The speaker cone was going crazy and after about 10 secs i see the dreaded smoke from the voice coil.

I dont know much about electronics, but i know it will cost more than the amp is worth to get it fixed by someone else so i thought i'd have a quick look. The problem i have is there is no evidence of anything wrong inside. all the components look fine and i've checked the back of the pcb for cracked solder joins or broken tracks but its all fine.

Can anyone suggest a possible cause of the problem? Or any methods of diagnosing the problem?

The pcb:
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Old 6th February 2010, 09:43 PM   #2
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If you have smoked the speakers then it is likely you have taken out the output transistors too.

What I do in these circumstances is remove all the output transistors and feedback the VAS output into the LTP feedback and check the front end of the amp is working fine. Check the output is not going to the rails and also the bias circuit is working correctly, even put a sine wave in and see if it comes out OK.

Only then would I risk any output transistors.
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Old 6th February 2010, 09:53 PM   #3
fbc is offline fbc  United Kingdom
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I've spotted this resistor looks burnt. Could that be the cause?

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Old 6th February 2010, 10:27 PM   #4
fbc is offline fbc  United Kingdom
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Quote:
Originally Posted by nigelwright7557 View Post
If you have smoked the speakers then it is likely you have taken out the output transistors too.

What I do in these circumstances is remove all the output transistors and feedback the VAS output into the LTP feedback and check the front end of the amp is working fine. Check the output is not going to the rails and also the bias circuit is working correctly, even put a sine wave in and see if it comes out OK.

Only then would I risk any output transistors.
Right Thanks. I havent understood all of that but i'm reading up on it. Is there no way to test the output transistors before taking them out. The amp has overload protection, and it didn't go into protection mode while i had it on, does that mean anything at all?

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