Question about Onkyo Audio Players & Recorders
Being a hospital electronics repairman (read I repair CT and MRI scanners), I recently had the pleasure of having our R-805x die on us with this exact same problem. I went through a lot of hoops to find the schematics on the system and what it came down to is the logic circuit on the main PC board, not the power board, has a logic control in there that is no longer able to determine the incoming voltage which prevents the system from locking in the relay on the power board. This is the reason for the clicking; the relay on the power module is energizing and de-energizing constantly.
I did not go any further than determining which board was causing the issue because ultimately it's going to cost about the same to repair (with shipping, headaches, man hours, etc) as a replacement system will be. I am currently researching replacment receivers for our MRI suite at this time.
Posted on Oct 06, 2010
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Posted on Jan 02, 2017
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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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