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Old 26th April 2011, 08:07 PM   #1
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Default Sony XM-2252HX

Hello everyone.

I have this Sony amp and it powers up sometimes, but sometimes blows the fuse. When it does power up its not drawing hardly any current, like its not on all the way. The "OFFSET" light it stuck on and the amp has no output. Does anyone know what would cause this light to be on?? I have read up on how spendy and hard the output fets are to buy and find.

Any advice would be great......Thanks.
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Old 26th April 2011, 08:14 PM   #2
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Check the solder connection on the busbar circled in red. It has a tendency to go bad.
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Old 26th April 2011, 09:16 PM   #3
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I resoldered the buss bar even though it looked ok. Still same thing. Upon applying remote voltage lots of current draw then "OFFSET" light comes on and current draw goes away, and amp remains powered on. I called the guy who owns it and he said the ground was shorting where he had it hooked up. Could a bad ground arcing have taken out 1/2 the power supply or some output fets? I dont know much about Sony amps so I really dont know which direction to go.
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Old 26th April 2011, 10:12 PM   #4
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check the transistor running the remote could be sticking open sounds like
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Old 26th April 2011, 11:09 PM   #5
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Do you see a pulse of DC on the bridging speaker terminal of either channel?
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Old 27th April 2011, 01:58 AM   #6
ppia600 is offline ppia600  United States
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That amp is a BEAST, I got one for cheap a while back and did some repair on broken traces around the speakers leads (board broken completely through) and some other cracked solder joints and it rocked. I sold in on ebay and didn't get squat for it, probably should've just kept it.


Sorry for the interruption.... as you were :lol:
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Old 27th April 2011, 05:46 AM   #7
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Quote:
Originally Posted by Perry Babin View Post
Do you see a pulse of DC on the bridging speaker terminal of either channel?
I dont see a pulse of DC but one of the bridging terminals starts out with like 6.50 vdc and slowly bleeds down.
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Old 27th April 2011, 08:07 AM   #8
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The pulse would be at the point where the power supply powered up. If you have 6v on it, that's a problem. If you don't have shorted outputs in that channel, check the driver transistors and the solder connections on the driver transistors.
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Old 29th April 2011, 11:31 AM   #9
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I have not checked the output fets yet. I will have to remove them from the circuit to test them correctly right? I would think if they were shorted I would have full rail voltage on the speaker outputs? I am not very familiar with sony amps, never liked them just trying to help out a friend.
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Old 29th April 2011, 02:45 PM   #10
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You can check for shorts in the circuit.

The amp wouldn't have full rail voltage on the speaker terminals if the power supply was shut down by the protection circuit.
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