Hi all, as per title, I have the common pioneer car stereo RCA buzzing issue.
I recently acquired a fully functioning HU from ebay, model :KEH-P8400R.
Its rather an older unit that plays cassettes but has CD control and/or AUX input. Perfect for my carPC, plus I wanted the retro look and my favorite old Pioneer logo and font.
Anyway, it was functioning. I had it temporarily connected up, drove with it, partially inserted and sounded great, with all the glorious tape hiss.
Then the next day, I came to fully fitting it. Everything was wired up properly and then the dreaded RCA buzzing (alternator whine) was heard.
I tested with a friends spare HU, the RCA cables to the amp are fine. I checked my amp ground connections, worked fine. No noise with tester HU.
I then set about grounding the pioneers RCA shields (a typical fix for possible blown pico fuse). This shielding repair did not work.
As my system is older, I cannot find an pico fuses and there are no mention in the service manual.
I really want his unit working, it was a hard find on ebay. Can anybody shed any light what could be the issue. Are there some hidden fuses or other component that could be blown and defunct-ed the RCA connections ?
The service manual can be found here:
https://www.manualslib.com/manual/95...eh-P8400r.html
I really do hope someone can help.
Appreciate it
I recently acquired a fully functioning HU from ebay, model :KEH-P8400R.
Its rather an older unit that plays cassettes but has CD control and/or AUX input. Perfect for my carPC, plus I wanted the retro look and my favorite old Pioneer logo and font.
Anyway, it was functioning. I had it temporarily connected up, drove with it, partially inserted and sounded great, with all the glorious tape hiss.
Then the next day, I came to fully fitting it. Everything was wired up properly and then the dreaded RCA buzzing (alternator whine) was heard.
I tested with a friends spare HU, the RCA cables to the amp are fine. I checked my amp ground connections, worked fine. No noise with tester HU.
I then set about grounding the pioneers RCA shields (a typical fix for possible blown pico fuse). This shielding repair did not work.
As my system is older, I cannot find an pico fuses and there are no mention in the service manual.
I really want his unit working, it was a hard find on ebay. Can anybody shed any light what could be the issue. Are there some hidden fuses or other component that could be blown and defunct-ed the RCA connections ?
The service manual can be found here:
https://www.manualslib.com/manual/95...eh-P8400r.html
I really do hope someone can help.
Appreciate it
Comment