Question about Sony STR-DE435 Receiver
My reciever was working fine then immediately stopped. Naturally, i opened the top and realized the fuse was blown(6.3amp 125volt). I replaced with 5amp 125 volt and as soon as i plugged in power, the fuse blew. This happend with no other source plugged into the receiver. So i assumed its an capacitor, cap or something of that nature. I having little electrical knowledge, would like to know if there a manual or certain current measurements i can use to help diagnose what particular element is shorting the circuit. Your help would be greatly appreciated.
SOURCE: Sony str-DE435 Flash Protector
this is not a reset problem, you have a defective audio output, is either the outputs transistors or the drivers IC's ( integrated circuit) and sometimes if you are lucky is just loose connections on the drivers IC;s.
Posted on Jun 18, 2009
If it keeps blowing the rated fuse you really need to take it in to a shop for further analysis. Using an incorrect, higher value fuse will only raise the risk of fire or more damage to whatever is blown in the unit.
Posted on Dec 09, 2010
Generally speaking, an amp attempts to protect 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 'nekkid'. 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.
Check for loose speaker connections at the speaker as another possible root cause for intermittent shutdown.
Posted on Sep 08, 2011
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