Question about JVC RX-E100 5-Channel Amplifier
Hi, I have a jvc rx-805v receiver. It started crackling in the speakers and then the speakers went dead.The amps on it have blown twice in the past(overheated?)The first time they were replaced,they only lasted a year. the second time, they have lasted for a number of years. The second time cost me over $100. It is a good unit and would be costly to replace.I would like to save some money this time by replacing the parts myself. How do you determine which are bad? Where to get the parts? The parts are Toshiba 2sb1429 and Toshiba 2sd2155. Thanks. Regards, Chuck
Repairing amplifier is not easy as you think, one mistake could lead to more damage, simply replacing output transistor may not solved it, and may damage the new parts, very risky. If you are not knowledgeable on this task, don't do it. Amplifiers are the most risky gadget to repair especially the high-powered amps.
Posted on May 20, 2007
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Posted on Jan 02, 2017
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Sep 12, 2011 | JVC RX-318 Receiver
Generally speaking, an amp protects itself from heat, shorts, overloads and >>>>operator exuberance<<<< by refusing to turn on or stay on.
Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.
You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.
If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.
If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.
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