Morning Folks...
I already searched for this and its kind of rookie question given the expertise Im reading on the site.
My Nak AV-10 is producing a whisper of a volume from one channel and none from the second. I havent plugged it in in 5 years but I recall both channels were doing the same thing.
I think the power transitors are shot or certainly the final drive section is in need of help. Its just a surround sound system and something I use at low-moderate volume with guests.
Is it worthwhile to fix it?
Anybody know what transistors I need to replace or should I just replace all of them?
Any suggestions on where to get parts or a kit?
(I have no problem upgrading components)
Thanks
Soldering iron is ready to go!
I already searched for this and its kind of rookie question given the expertise Im reading on the site.
My Nak AV-10 is producing a whisper of a volume from one channel and none from the second. I havent plugged it in in 5 years but I recall both channels were doing the same thing.
I think the power transitors are shot or certainly the final drive section is in need of help. Its just a surround sound system and something I use at low-moderate volume with guests.
Is it worthwhile to fix it?
Anybody know what transistors I need to replace or should I just replace all of them?
Any suggestions on where to get parts or a kit?
(I have no problem upgrading components)
Thanks
Soldering iron is ready to go!
Only general advice without seeing a circuit diagram but faulty transistors would be way down the list for low volume. Power transistors normally fail short circuit and that would result in blown fuses or other obvious distress.
Also never replace replace parts in hope as that is a recipe for disaster. You should start by obtaining a circuit diagram and at the very least begin by checking all the supplies are correct and that key voltages in the power amp sections are OK (or not).
The symptoms you describe are just as likely to be in the small signal processing stages as in the power amp. And before any of this you should really confirm the fault is genuine and not down to a user setting somewhere or missing links on the rear panel (if it has them) between pre and power sections. Both channels with an issue suggests something common to the two.
Don't be under any illusions, these kind of beasts are not easy to work on, even for experienced techs.
Sorry its not more upbeat but that is the reality of something like this I'm afraid.
Also never replace replace parts in hope as that is a recipe for disaster. You should start by obtaining a circuit diagram and at the very least begin by checking all the supplies are correct and that key voltages in the power amp sections are OK (or not).
The symptoms you describe are just as likely to be in the small signal processing stages as in the power amp. And before any of this you should really confirm the fault is genuine and not down to a user setting somewhere or missing links on the rear panel (if it has them) between pre and power sections. Both channels with an issue suggests something common to the two.
Don't be under any illusions, these kind of beasts are not easy to work on, even for experienced techs.
Sorry its not more upbeat but that is the reality of something like this I'm afraid.
If it has been sitting for 5 years, use a blower, give it a good clean.
Then use a good quality contact cleaner on the selector switches, power switches, and cable connectors. Also use spray on the headphone, and mic (?) sockets.
Work the switches and sockets several times.
Look for burns and bulged capacitors.
Let it sit for a day.
Then do what Mooly says.
Get hold of the service manual, check all voltages, bear in mind you can touch mains or high voltages inside.
Those are well made beasts, but even experienced people hesitate when those and Denon are encountered.
Good luck to you.
Then use a good quality contact cleaner on the selector switches, power switches, and cable connectors. Also use spray on the headphone, and mic (?) sockets.
Work the switches and sockets several times.
Look for burns and bulged capacitors.
Let it sit for a day.
Then do what Mooly says.
Get hold of the service manual, check all voltages, bear in mind you can touch mains or high voltages inside.
Those are well made beasts, but even experienced people hesitate when those and Denon are encountered.
Good luck to you.
There is a manual on HiFi Engine:
Nakamichi AV-10 Audio Video Receiver Manual | HiFi Engine
It is one complex piece of kit although the five power amps look conventional.
The signal processing and switching is hugely complex with LSI chips dotted around. You would need an oscilloscope to trace a signal from input socket through the various stages.
Nakamichi AV-10 Audio Video Receiver Manual | HiFi Engine
It is one complex piece of kit although the five power amps look conventional.
The signal processing and switching is hugely complex with LSI chips dotted around. You would need an oscilloscope to trace a signal from input socket through the various stages.
