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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Troubleshooting a dead Onkyo TX-SV727 Receiver - Pwr Supply Suspect
Hello,
I've tried searching this group and looking for relevant information but nothing really related to the basic troubleshooting I'm doing for my dead Onkyo TX-SV727 Receiver. iBACKSTORY/i The electricity in my house is pretty janky and my stereo may have been shorted out because of that. Basically, my wife was listening to music when something happend and she saw the words "Protect" come on the display. bTROUBLESHOOTING STEPS TAKEN/b I checked the speaker wires and they had no damage (so that didn't short it out). I tried replacing the fuse with several different ones. The stereo came with a T 6,3A 125V Fuse, but I could not find that specific one in any of the shops here in Portland. I've tried 6A at 125V and also 5A at 220V but they all blow within seconds. I've also inspected the power supply and there are no obvious scorch marks or soder marks that look shorted out. Please help me figure out what to do next. Thanks! |
#2
Posted to sci.electronics.repair
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Troubleshooting a dead Onkyo TX-SV727 Receiver - Pwr Supply Suspect
electronic repair wrote:
Hello, I've tried searching this group and looking for relevant information but nothing really related to the basic troubleshooting I'm doing for my dead Onkyo TX-SV727 Receiver. iBACKSTORY/i The electricity in my house is pretty janky and my stereo may have been shorted out because of that. Basically, my wife was listening to music when something happend and she saw the words "Protect" come on the display. bTROUBLESHOOTING STEPS TAKEN/b I checked the speaker wires and they had no damage (so that didn't short it out). I tried replacing the fuse with several different ones. The stereo came with a T 6,3A 125V Fuse, but I could not find that specific one in any of the shops here in Portland. I've tried 6A at 125V and also 5A at 220V but they all blow within seconds. I've also inspected the power supply and there are no obvious scorch marks or soder marks that look shorted out. Please help me figure out what to do next. Thanks! Now that you have tried a few things to see if you can see something wrong, I would suggest you take it to someone who understands something about electronics. Based upon your text above, I get the feeling you would not be able to replace the faulty component even if it were identified for you. This is NOT meant to be a slam, but advice that might save you some money in the long run. |
#3
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Troubleshooting a dead Onkyo TX-SV727 Receiver - Pwr Supply Suspect
"Ken" wrote in message ... electronic repair wrote: Hello, I've tried searching this group and looking for relevant information but nothing really related to the basic troubleshooting I'm doing for my dead Onkyo TX-SV727 Receiver. iBACKSTORY/i The electricity in my house is pretty janky and my stereo may have been shorted out because of that. Basically, my wife was listening to music when something happend and she saw the words "Protect" come on the display. bTROUBLESHOOTING STEPS TAKEN/b I checked the speaker wires and they had no damage (so that didn't short it out). I tried replacing the fuse with several different ones. The stereo came with a T 6,3A 125V Fuse, but I could not find that specific one in any of the shops here in Portland. I've tried 6A at 125V and also 5A at 220V but they all blow within seconds. I've also inspected the power supply and there are no obvious scorch marks or soder marks that look shorted out. Please help me figure out what to do next. Thanks! Now that you have tried a few things to see if you can see something wrong, I would suggest you take it to someone who understands something about electronics. Based upon your text above, I get the feeling you would not be able to replace the faulty component even if it were identified for you. This is NOT meant to be a slam, but advice that might save you some money in the long run. Seconded. This is almost certainly an output stage failure, and in a DC coupled amp such as this, may well be cascade in nature. These are potentially tricky for the best of us, and a set of schematics, and the ability to understand them in detail, is certainly required to even begin to tackle this sort of problem. Depending on where exactly in the circuit the fuse that's blowing is located, there is a slim possibility that it could still be something simple in the power supply such as the bridge reccy, but if you do not have experience of detailed fault location to component level, I would agree with the good advice given by Ken, and consider taking it to a reputable repair shop. Arfa |
#4
Posted to sci.electronics.repair
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Troubleshooting a dead Onkyo TX-SV727 Receiver - Pwr SupplySuspect
On Sun, 05 Sep 2010 11:10:36 -0700, electronic repair wrote:
Hello, I've tried searching this group and looking for relevant information but nothing really related to the basic troubleshooting I'm doing for my dead Onkyo TX-SV727 Receiver. iBACKSTORY/i The electricity in my house is pretty janky and my stereo may have been shorted out because of that. Basically, my wife was listening to music when something happend and she saw the words "Protect" come on the display. bTROUBLESHOOTING STEPS TAKEN/b I checked the speaker wires and they had no damage (so that didn't short it out). I tried replacing the fuse with several different ones. The stereo came with a T 6,3A 125V Fuse, but I could not find that specific one in any of the shops here in Portland. I've tried 6A at 125V and also 5A at 220V but they all blow within seconds. I've also inspected the power supply and there are no obvious scorch marks or soder marks that look shorted out. Please help me figure out what to do next. Thanks! Problem with the amplifier is usually suspect if no blown fuses and you get a Protect warning. Unless you have explicit experience in repairing consumer audio electronics I strongly recommend you take the unit to a qualified repair facility. -- Live Fast, Die Young and Leave a Pretty Corpse |
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