1. Home
  2. Electronics Repair
  3. Emerson TV/VCR : Worth the Trouble?

Emerson TV/VCR : Worth the Trouble?

This '91 model TV/VCR combo is driving me up the wall. After replacing the bad belts and idler tire, the unit appears to work nicely - then I notice a thin line of distortion in the tape playback. It's just above the center of the screen and runs all the way across - not snow, just distortion (almost like pixellation). I've ruled out head alignment, dirty heads, backtension, and tracking problems. At this point I suspect some capacitors are up in ESR, which isn't good because I don't have an ESR meter. I'm willing to try replacing a few caps at random, but there are too many to just guess on - anybody know of any specific caps to try? This thing is hardly worth repairing when you consider I'll only make about $30 profit from it, if it will even sell. But at the same time I hate to junk it because $30 is well, $30. That's how bad business is these days. So bad I can't even justify buying an ESR meter, because it would literally take months (if not years) to pay for itself. Thanks for any advice.

Reply to
Chris F.
Loading thread data ...

Hi Chris...

Dunno how much help (if any) this will be, but... :)

I'm an old guy. Back in the olden days, you know, just after dirt was invented, just before they invented sunshine, we didn't know what ESR was. Didn't know any of the fancy words that today's young pups use. Think they invented them just to confuse us old guys :)

So, we didn't have esr problems. None at all. Or maybe we did and just didn't know it :)

What we _did_ have was what we called weak caps. Plenty of them. And we fixed them in one of two ways, with no esr meter.

Here's how. In circuit we just paralleled them with a good one. Didn't even solder them, just held one in your fingers and held it in place while the device was powered up.

Out of circuit - which may be more acceptable in today's world - we used a plain old analog ohmeter. Set it on its R1 scale, zero it shorted. Discharge your suspect cap just in case. Then "measure the resistance" of your cap. Watch carefully how "shorted" the meter goes, how quickly, and how quickly it charges so as to read open. After it's finished (open) reverse your probes and do it again the wrong way 'round.

Try this a few times (or was it a few thousand? :) with a few new caps and a few known to be not good ones and you'll see a very great difference.

And that's how we found "weak" caps, or to the younger folks, high esr caps. I'm sure you can do the same :)

Having said all that, though, I'm pretty sure that the prob in your vcr is going to turn out to be alignment. Particularly so if the line isn't walking.

Take care.

Ken

Reply to
Ken Weitzel

May be the stator. Sky.

Reply to
Skype_man

Three thoughts

1 Check to see if there is a capacitor on the Cylinder motor and replace it.. I had other brands with this problem.

2 I recall having vertical problems on some emerson tv/vcr which both units must have shared the same 9 volt supply. The 9v supply feed either pin 1 or 2 of the vertical Ic ( not the main supply to the chip) and when pushing play on the vcr the set would go into vertical colasp. May 9v just slightly week in your case.

  1. . Do a google search on ESR circuits and you should find a set up using you signal generatoe and scope...Sorry Indon't have it bookmarked.
Reply to
Doug

Chris F. ha escrito:

are you absolutely sure there isn't still a bit of grit somewhere on the tape path? i have never seen this fault caused by bad caps.....

-B

Reply to
b

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.