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Pioneer SX1010 protection with antenna wire connected

Amcrebelfan

Amcrebelfan

Super Member
I just got a sx1010 and when I hook up a wire for antenna it will go in and out of protection. If I pull it off it is fine. Any ideas why this would happen? I was using speaker wire for the antenna and had it draped over my wall bracket for my tv. Very odd.
 
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Wire is insulated only bare wire is connected to terminals. Thanks for the link I will go over it and try the suggestions. I just don't get why it is fine without the wire. I used it all night on phone and aux. I had the tv running through aux so the fam could watch the glee rocky horror episode. Sounds amazing. There is one station that is strong enough to come in without an antenna and it sounds great with no problem. I didn't try another antenna yet, so I am hoping that is the only problem. I gotta good money already in this, I don't want to throw money down the drain.
 
Ryuuoh I will try that thanks, thanks again for the link I am gonna get my multimeter out tomorrow and check it out.
 
Amcrebelfan said:
I just got a sx1010 and when I hook up a wire for antenna it will go in and out of protection. If I pull it off it is fine. Any ideas why this would happen? I was using speaker wire for the antenna and had it draped over my wall bracket for my tv. Very odd.
Click to expand...

The only thing that I can think of is pretty far-fetched, but then so is your problem, so I'll have a go at it.

What happens if you move the antenna wire off the TV bracket and place it elsewhere, such as lying on the floor? If that makes the amp work properly, then somehow a high level of RFI or other strong electrical noise (some flat panel TVs generate a lot of it) is getting into the amp via the antenna connections and then leaking into the power amp section, where the protection circuitry sees it like it would an ultrasonic oscillation and trips the protection. It would take a faulty part or parts to do this, normally, and as I said, finda far-fetched. The antenna shouldn't couple into anything but the tuner circuitry.

If moving the antenna doesn't change things, then I suspect something similar to the above, but with strong radio signals leaking into the power amp instead of external RFI noise generated by the TV. Again, this means a faulty part (capacitor or somesuch) that is allowing this to happen inside the amp.

'Tis a weird'n, verily.
 
Ok I will stop by rat shack tomorrow after physical therapy. Another question, can an electric shock from a person touching a receiver put it into protection? The reason I ask is a buddy was showing me his 9090 when we walked across the carpet to turn it up he got quite an shock when he touched the chassis and bam it went into protection. He immediatly decided there was no way this could be enough of a shock to do that and is planning on sending it out for service. I was getting shocked on everything I touched that day.
 
I think it's entirely possible a static electricity "zap" could send a receiver into protection given the right condtions. A static discharge big enough to jump from your finger to something is thousands or tens of thousands of volts, albeit very low current.
 
Attaching an antenna and activates protection?

Would this be an F connected antenna? ... shared from the cable feed?

If so, be careful with that one. I've seen ground loops cause thinner ground traces to vaporize on some sets. In one of the examples I saw, the F connector has a large ground connection to the chassis. It was the signal grounds for the audio inputs that had a thinner trace to the circuits main ground. As a result, the analog audio circuit ground was vaporized from the board. When something like this happens, you can get all kinds of weird behavior. ... like the DC ground reference of an amplifier's input sloshing around, perhaps activating the protection circuit. With all connections disconnected, you should get continuity from the F connector's shell to the shells of your RCA connections on the set.
 
Agreed, this is beginning to sound like the classic ground loop caused by poor installation of the TV cable. Pull it and the TV first and see if the antenna symptoms you report go away.

Better yet, strip out the whole system down to the minimum items, attach the antenna and see if you get the fault. Odds are you will not. Then add back the TV connections first. See if you get the fault. If not, then one after another connect up the other items you have to the receiver until you get the fault. There's your gremlin - or at least part of the ground loop.

Proceed carefully.

Cheers,

David
 
Try turning the SX-1010's plug 180 degrees.
One leg of the AC line ties to the chassis with a high value (22meg?) resistor.
 
Classic_CJ said:
The only thing that I can think of is pretty far-fetched, but then so is your problem, so I'll have a go at it.

What happens if you move the antenna wire off the TV bracket and place it elsewhere, such as lying on the floor? If that makes the amp work properly, then somehow a high level of RFI or other strong electrical noise (some flat panel TVs generate a lot of it) is getting into the amp via the antenna connections and then leaking into the power amp section, where the protection circuitry sees it like it would an ultrasonic oscillation and trips the protection. It would take a faulty part or parts to do this, normally, and as I said, finda far-fetched. The antenna shouldn't couple into anything but the tuner circuitry.

If moving the antenna doesn't change things, then I suspect something similar to the above, but with strong radio signals leaking into the power amp instead of external RFI noise generated by the TV. Again, this means a faulty part (capacitor or somesuch) that is allowing this to happen inside the amp.

'Tis a weird'n, verily.
Click to expand...
I also think this could be happening.

Along with the many high-speed digital processors the typical flatscreen TV uses, very possibly along with those could be high-powered switching power supplies, which AFAIK can also generate a lot of RFI (one reason most better mid-fi and especially hi-end components don't usually use them). Not to mention whatever components power and operate the fluorescent lighting system that most LCD flatscreens use (plasma sets don't use any external lighting system).
 
dshoaf said:
Agreed, this is beginning to sound like the classic ground loop caused by poor installation of the TV cable. Pull it and the TV first and see if the antenna symptoms you report go away.

Better yet, strip out the whole system down to the minimum items, attach the antenna and see if you get the fault. Odds are you will not. Then add back the TV connections first. See if you get the fault. If not, then one after another connect up the other items you have to the receiver until you get the fault. There's your gremlin - or at least part of the ground loop.
Click to expand...

This was my first thought also, but the OP stated:

"I was using speaker wire for the antenna and had it draped over my wall bracket for my tv."

The OP did not state that the antenna was connected to anything but the receiver, as least that's how I interpreted the above sentence. Now, if the TV is connected to the receiver via an audio patch-- and the OP did state this was the case, there could be a ground loop there, but if the antenna is not connected to anything at the other end, how could that cause the problem described?

Thus, my thinking it was RFI related, bizarre though that might be.

Your suggested diagnostic procedure is right on, however, so hopefully that will give the OP and us some more info to work with.
 
Well not sure why it did that, but all seems well now. Just using a dipole from ratshack. Thanks so much to all for your great advice, as always you guys rock. Have a good one.
 
Back to going in and out of protection, has nothing to do with antenna wire. It is doing that without one connected. No rhyme or reason, works fine one day and then the next every two seconds in and out of protection. I have contacted 3 techs either by email or phone and none have returned my calls. I am hoping this isn't a big money fix any ideas? :(
 
Protection circuit probably needs a rebuild. Not a big deal, as long as you find someone with a clue to work on it.
 
Thanks Echowars for the reply.. Just got a call back from a tech going to try and get it to him next week. I am supposed to be having back surgery soon, was supposed to last monday but delayed. I would love to get it fixed before I am laid up a couple months. I love how this receiver sounds
 
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