CED VideoDisc and Player Discussion

[Gunner]

So tonight I picked up an RCA SGT250 in a local ad. I get home and the player works. The machine hums fairly loudly but the picture is perfectly clear. My main concern is I have no sound. Again, picture is perfect but have no audio. I cant figure out why no sound. Any suggestions anyone?

[Gunner]

Well I fixed the audio problem now I just have to figure out how to make the hummking noise go away. I suspect the belts may need some greasing or lubrication. Does anyone know the best way to lubricate the belts and what to use? This player is in excellent condition otherwise.

[blindfury420]

On an sgt-250 never grease or oil the belts. It ill make them not work, especially the servo belt. Only grease metal on plastic or plastic on plastic and oil metal on metal eg. turntable shaft.

I have had the top board on a 250 bent too low (prior owner set cinder blocks on top?) and scrape and push down the metal plate which made an intense rubbing noise.

If you are not experiencing any video problems the rubbing must not be enough to slow tt down. I can only suggest to do the standard maintenance and cleaning and try and observe the player with top off to try and locate source of humming/rubbing noise.

Are you able to make a video?
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I dont own

McMicheal 5001h
Hitachi VIP202P
JCP 686-5705
RCA SKT265, SKT300
RCA SJT400X, SJT425

[SelectaVision420]

wasn't there something about the sgt 200 and 250's first generations had some extra plastic under the stylus cover, and the later ones, had beveled edges on the sliding cover, maybe there was too much weight on it at one point, try watching a movie without the stylus cover on maybe? i might be thinking of something else though...
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(2)Sears 274 & 934(80150,10&11350), sft100, sgt250, sjt 090-400, vp550, VDR3000, VP2000 & 4000
complete '84 Dimensia Owner

[blindfury420]

http://www.cedmagic.com/tech-info/repair-solutions.html#cabinet-access-door-impeding-pickup-arm-movement

But I don't think that creates a humming or rubbing noise It just impedes stylus arm from progressing.
_________________
I dont own

McMicheal 5001h
Hitachi VIP202P
JCP 686-5705
RCA SKT265, SKT300
RCA SJT400X, SJT425

[Rixrex]

If you have a steady hummig sound fom any device, you need to think about what causes that type of sound first. A hum is a regular vibration that cycles so quickly that a person can hear it as a sound.

The most typical hum one can hear from electronics is the 60 cycle hum of the AC current, usually heard from a speaker when there's some sort of defective electronics part. It sounds like a low bass buzz that you hear if you ground out a RCA plug or connect a video out to a sound input by mistake.

Other than that, what can cause a hum on a CED player would have to be related to the turntable spinning. There's nothing else that cycles at a regular frequency to make a hum. It could be a part that is transferring the turntable frequency in a way that created a hum you can hear.

For example, the spline or plastic ring that stays in the player with the disc has been known to vibrate as the turntable spins and create a hum. If a disc is played with the cover off, you can pinpont the hum more easily by close listening and gentle touching of parts from where the hum seems to be emanating. By touching the part, such as a spline or electronics panel away form the circuitry, you can stop the vibration and hum and find its cause that way.

[SelectaVision420]

[Gunner]

Thanks guys. I will play it without the cover to see what is causing that noise.