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Post by mastertech on May 10, 2018 14:14:39 GMT -5
No, it is internally shorted. Nothing to bypass. Sorry.
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srt
Junior Member
Posts: 90
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Post by srt on Aug 6, 2019 4:07:10 GMT -5
No, it is internally shorted. Nothing to bypass. Sorry. That mean the micom is bad? i have an onkyo tx nr 525 prblem is completely dear as same here relay is ok(I tested manually) but when in check 12volt its always fluctuating , means it goes to zero and 12volt again like that , but when I unplug the SMPS connector I am getting stable voltages , do I need to test relay transisotr ?
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Post by tjmotter on Aug 19, 2019 13:16:25 GMT -5
If the MICOM is bad the system is likely junk. Onkyo uses a MICOM from a company called Renesas. These chips have embedded flash storage and Onkyo has to load a program (specific for the model) onto that chip to make it work. It requires a very specific programmer that comes from Renesas. I bought one when they were available from Digikey but they have been discontinued. Worse, ever since the NRx4x generation (like the 646), Onkyo has been enabling the "read protect" function from the factory which means you can't extract a copy from a working system without the 10byte security id. I have tried numerous times to figure out what this id is with no success.
My only caveat to this is that it seems that this security id is reset to the default in some rare cases. My current theory is that this may happen if the customer has ever upgraded the firmware on the system using the Onkyo update utility.
If you don't have a spare MICOM with the correct code already on it, your only option is to have Onkyo repair the board. Oh yeah, and Renesas will not sell this chip. I have had success in buying broken Onkyo boards and pulling the MICOM off but this only works if it is for the same model since the program is different for every model.
sorry, Todd
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