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I have a 3yr old Rotel Amp RB1080 with RC1070, problem no sound all lights working all fuses good.

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This unit is in protect mode. The outputs are disabled to prevent further damage to either the amp or the speakers. If you are not comfortable with electronics, bring this to a servicer. Expect a parts cost in the range of $15-$40 plus the local labor rate.

Posted on Apr 09, 2008

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Based on your post, the pre-amp is doing its job. What might be the mismatch would be the powered speaker system plugged into the output of the Rotel. Depending on what the "powered speaker system" is, it might be that it is a low impedance such as those used in computers whereas the Rotel requires high impedance to be connected to its output. What could be tried is to connect a regular amp or receiver to the Rotel.

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Hi kerrijon

Oh dear, your budding lil electrician may have gotten out of his depth:).

Shorted speaker wires often result in damage to the amps output stages. The blinking light tells us that the unit has gone into protection mode, preventing damage to the speakers from the amp. It will have what is termed a DC offset condition being generated by the channel; that got shorted. There is no easy fix for this and you have checked the obvious with fuses and removing all speaker wires and checking operation. The unit will have a blown output transistor/array, possibly driver transistors, and fusible resistors, and diodes to that channel. The bias current will also need to be set up again once repairs are completed.

There are no user serviceable parts in a unit like this. With good knowledge of electronics, a multi meter, soldering iron and experience at using all, you could fault find the channel, replace the parts yourself. I should warn you that if descrete components are used, they can be difficult to repair because of the nature of DC coupled linear stages employed. The best option is to take it to a repair man for a quote.

I am happy to try and talk someone through a repair process, but there is a degree of difficulty ascociated with not being able actually work on the amp.

The best solution for you is to get a tech to look at it. This sort of repair work can range from $80-150 depending on the parts used and the time taken to fault find and replace parts. I hope that this helps you. Your appreciation for my time spent to give you this advice is best rewarded with a FixYa.



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