Carver Receiver 2000 Sonic Hologram

[Joe C 13]

Hi guys, I’m looking for some input. I’m having an issue with my receiver 2000. The issue is when I press the the Sonic Hologram button, it bumps, meaning it engages or disengages the relay so quickly the status doesn’t change. When I initially picked it up and recapped it, I also replaced the relay which was part of the failing items in the service emmanuel. I also swapped out the push button from another board I had. Can anyone point me in a direction. It’ll be greatly appreciated.

[4krow 3,845]

Sorry, I am not familiar with the Receiver 2000. My question to you would be is the relay really part of the SH circuit? I ask this because in the few units that I have seen with the SH function, no relay was involved. So, the pushbutton that you replaced might a 'touch type' of button/switch and not like the regular actual push button/switch on older units?

  In my limited experience those touch type of button/switches are glitchy to begin with, making trouble shooting more difficult to begin with.

[Joe C 13]

Thank you for your reply. The relay is part of the SH circuit switching it on and off. The switch is as momentary push button switch which I agree can be finicky. It almost sends like the plastic tab on the back of the button isn’t hitting it square and causes a double or triple bump. I’d almost like to see if I could find the same type switch to fit the board but with a larger pass on the top of that makes any sense. That would give the plastic contact point a larger target to strike and hopefully it would close that contact once. Idk, I’m thinking out loud lol

[4krow 3,845]

 Yes, I agree about the contact surface of the switch, and the bounciness of it as well. I have never cared for this design. Just a while back I was working repairing a remote control, figuring that some of these switches were the cause of a failure. Now I mention this because what I found was not the switches at all, but an associated electrolytic capacitor that was bad. Never occurred to me that this would matter but that was the fix. You did mention however that you had replaced all of the electrolytic capacitors already, so maybe that is not so much of a possibility. 

[Joe C 13]

I’m glad you mentioned a cap because I started questioning in my mind if possibly it could be something like a cap. I mentioned I recapped it but misspoken a bit. I recapped the pre and main amp sections along with a couple miscellaneous throughout. So it’s very possible it could be as bad capacitor and I’ll need to dig into that a bit. I thinkI may pull it apart and try pushing the button with my finger. If it works ok, it’s more than likely the switch issue. If I still get a bounce, then I’d think it has to be something electrically related. Thanks for the suggestion.

Edited February 8 by Joe C

[4krow 3,845]

Joe,

 

 It will be interesting to find out. I was pretty surprised that I hadn't tried it before, and even more surprised that it worked.🙉

[Receiver2000 1,779]

My SH switch on my R2000 does the double bounce unless I press it extremely softly.  My work around is I use my remote. The remote operates it perfectly.

[Joe C 13]

That’s exactly what I found as well. If I press it very softly, I’m good. A normal push bounces.

[Rob 3,475]

These are the little rubber button switches on the board 

 

[Rob 3,475]

And here are the backs of the push buttons. Maybe the cylindrical tabs that press on the rubber buttons are ready to fall off or the button is bad. I haven't had anything going on before like you are talking about but these buttons are used in a lot of equipment and also the 2000 remote controls use them. 

Edited February 9 by Rob

[4krow 3,845]

Yes! Those are the little demons that I fought. Worn out ones will not even make a contact, which was the case with one or two of them in my old remote. You have an additional problem though, and that is the physical contact between the outside button and the inside button that is actually the contact. I mean to say that if there were any wobble to the outside button (bar shaped, no less) on the faceplate, then it is transferred to the inside button if that makes sense. So it seems that your fingertip would have to be pushing right in the middle of the faceplate (outside) button, which looks to be more in the shape of a bar, or else it has the chance to push just on one edge of the internal round button. It sounds like I am picking this apart, but these little guys are pretty picky as to how they are poked. Even on my remote where the buttons are completely exposed, your fingertip can be pushing the button in an indirect manner, causing the contact not to be made as hoped, and the degeneration begins. 

  In short, this is a crappy contact. Period.

 

 FWIW, I may have a bunch of these that you can have if you want them. I found them a bit hard to remove from the circuit board, but you are welcome to try it. LMK