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Fisher RS-280 Repair Preview & Circuit Tour

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Published on Feb 27, 2014

A Fisher RS-280 is abandoned by a customer at Andrew's Electronics. Since they already have many other stereos, some of which can be fixed more economically, they left this one with me in exchange for a quick and very inexpensive repair on a Pioneer SX-434.

An quick overview of the circuit and a demonstration of its rather energetic failure mode is shown at the end.

This is a Sanyo designed and produced product, it is not the Fisher of old. Still, it's an example of well designed Japanese electronics and worth repairing. Specs are decent too...100W/ch at 0.05@ THD from 20Hz-20kHz. It will live to play again for many years to come after a new output module is installed, the unit including the controls is cleaned, the solder joints are inspected and some caps are changed out.

It will be for sale soon and will make a great receiver for someone....especially if they like it loud but don't want to break the bank! It's getting a 1 year warranty.

A couple statements in this video were found to be in error upon further disassembly and subsequent circuit analysis. These are covered in a couple annotations in the video...here are the cliff notes: The STK0100-II is rather primitive in regards to integration and needs a full external drive stage and the predriver has a CCS instead of a current mirror. The timing cap is in a different position than previously guessed, the cap in question was not a low leakage cap for timing purposes like you might see in a Kenwood, the cap mentioned is specially colored because it is rated for 125°C. Everything else is correct.

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