Question about Onkyo Audio Players & Recorders

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Onkyo AV Reciever Model #HT-R540 was given to me by a friend, it had been violently dropped by UPS, upon taking it apart noticed one of the plastic standoffs had broken through the circuit board in one of the amplifier sections near the heat sink. Bypassed the broken area by soldering wires and repaired a few cracked circuit traces, haven't found any more obvious problems. System won't power up at all, no standby light, line fuses are good and line voltage is present, and am receiving voltage output from the small transformer, a little confused about where I should measure voltage on the larger transformer. Help Please!

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SOURCE: Yamaha RX-V420 No power

If the standby voltage exists, the next step is to see whether or not the clock is working. Find the main micro chip. There should be a 3 legged crystal close by. You should see this oscillate (use a scope). No oscillation = no micro control = no turn on. It is possible that the micro is bad or the crysal is bad. Also, check to be sure that the output transistors are not shorted. It is also possible that these are preventing the system from turning on.
Dan

Posted on May 12, 2008

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SOURCE: Onkyo TX-DS777 Problem

man I think i have the same problem....
i push the power button but immediatly the LED turns off. I cheked the fuse but thats not the problem. Please if you solve your problem let me know...
my e.mail adress soy_robertog01@hotmail.com
sorry if you dont undersatnd me in some parts..im not very good writting english haha sorry..

Posted on Jul 29, 2008

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SOURCE: No audio

I know that a couple of you have had the same problem with the blowing 0.47 ohm resistors. I had responded quite a wile back, but forgot to make any updates. Kostiko is correct about the problem relating to these two 0.47 ohm resistors being blown. In my case on two different Haman Kardon models, this was true, but there could also be another issue. What i have found is even after replacing these resistors, the problem appeared to still be there. What was happening was that right after turning the receiver on, the resistors would blow again. What you need to do is replace the two small ceramic disc style capacitors on the same pcb as the fusible resistors, as they could be shorted as in my case. You could remove these capacitors completely, or replace them with a similar size of the same type, as they are really just there for filtering higher frequency noises from the power supply. You can check them with your multimeter first. They shouldn't shorted even in situe. I forget the size, but they are approximately 100 nano farads. Good luck. I have done this to my AVR135, and it has been running great for about 6 months now.

Posted on Feb 03, 2009

  • 152 Answers

SOURCE: Power will not stay on

Activated protection circuitry means that the amplifier is seeing conditions it does not like and is shutting down the power to prevent further damage.
Either you have a short in your speaker wires, in your speakers, or a blown amplifier.
Disconnect both speakers and turn on the amplifier. Does it still give the error message? If it does, your amp is blown. If it does not, carefully inspect your speaker wires and their connection. Make sure all looks good and reconnect the speakers and try it again. Still get the error message? You likely have a problem in your speaker cabinet(s).

Posted on Apr 21, 2009

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