Schematics for the Onkyo
Hi,
Just to let you know that FixYa has sent the diagram of the A-8190 and that am checking possibilities. Let you know ASAP.
Kind regards.
Benimur
Just to let you know that FixYa has sent the diagram of the A-8190 and that am checking possibilities. Let you know ASAP.
Kind regards.
Benimur
Audio Players & Recorders
Answers & Comments
Benimur,
I don't have the info on the initial question/posting, but Onkyo systems I have worked on often have open driver transistors as well as shorted outputs. With one of the driver transistors open, the voltages tend to float to one side. The 18V you mention sounds like that is what is happening. have the initial asker replace the driver transistors (as a pair) just like the outputs.
Keep me posted.
Dan
Actually, if one of the drivers is open or one of the low voltage feeder resistors is open, this kind of offset is possible. Can you forward the schematic to me at dfleuryATverrents.com?
I'll look into it a bit more and update this again.
Thanks,
Dan
After looking at the schematic, I see that this unit has a TA7317 chip. This is the "protection" chip and these are known for going bad. It is quite possible that the source of the 18V is this chip. have the asker change this IC. That may resolve the problem. Otherwise, lift the bases of each of the 4 output transistors and post the voltage readings on the 3 pads of each transistor here.
Dan