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Old 3rd January 2013, 10:19 PM   #1
diyAudio Member
Join Date: May 2011
Location: UK
Default Orion Xtreme 800.4


I've recently picked up an old Orion Xtreme 800.4 which was faulty. Opening it up I found that the PS FETs on one side had all failed and also the two driver transistors (Q59 & 60) and one other Q34.

I've replaced everything like for like and the amp powers up OK, idle current is about 1.5A, rail voltage is a good +- 30v and it plays audio cleanly from all 4 channels.

After running for 10 minutes I've noticed that one side of the PS transformer is much warmer than the other but not hot. There is also a resistor array (R135) that is also getting warm along with what I think is one of the 15V regulators on the under side of the board.

The only thing I've noticed is that there is some noise on the feed to the side of the transformer that's getting warm. I've attached a picture of the waveform for my scope and sorry for the quality. As you can see there is a about a 5v spike on the waveform. Is this something to worry about and causing things to warm up?


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File Type: jpg IMG_0331.jpg (996.9 KB, 64 views)
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Old 4th January 2013, 12:16 AM   #2
diyAudio Member
Join Date: Nov 2003
Location: Louisiana
Do you mean that one transformer is warmer or do you mean that 1/2 of one of the transformers is getting warm?

The spike isn't significant but if it's on only one transformer, it could mean that there is a problem with the circuit driving it.

Can you post a photo of the power supply area in the amp?
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Old 9th January 2013, 11:40 AM   #3
diyAudio Member
Join Date: May 2011
Location: UK
Sorry for the delay in getting back to you.

One half of the transformer is warmer than the other side.

Attached are a couple of pictures of the PS.
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File Type: jpg DSCF8110.jpg (739.3 KB, 38 views)
File Type: jpg DSCF8111.jpg (754.3 KB, 37 views)
File Type: jpg DSCF8118.jpg (701.4 KB, 34 views)
File Type: jpg DSCF8113.jpg (688.9 KB, 35 views)
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Old 9th January 2013, 11:46 AM   #4
diyAudio Member
Join Date: Nov 2003
Location: Louisiana
Is it possible that some of the components on the board are getting hot and causing the transformer to heat up?
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