CED VideoDisc and Player Discussion

[Brian Stearns]

Hello, I recently purchased a sjt100 and a bunch of ced off ebay,when I played on crt tube tv I get a shaky picture. I get same result on my Toshiba 40 lcd tv. So could it be a stylis problem causing me not to get a steady picture?

Thanks
Brian

[SelectaVision420]

the turntable could have a slight wobble in it, this is with every disc you tried?
im not saying it couldnt be the stylus, how well was it packaged for shipping, did it come with shipping locks in it?
_________________
Sears 274 & 934(80150,10&11350),sft100,sgt250,sjt090,100,101,200,300,400,vp550, VP4000!
caddy.daddy.fleetwood@gmail.com

[Brian Stearns]

Packaging I would say not very good,no shipping locks. The player could shake in the box

I tried many disc same results

If its the table, how should I proceed

The player came with a melted belt, so I replaced this. I looked at the stylis it looked ok but not sure what I need to look for.

This is my intro in the ced world. Ive always been fascinated with old movie formats. I have collected 8mm and 16mm.

I love repairing stuff

[SelectaVision420]

the best way to see whats up is to operate the player with the cover off, to see the turntable spin, its possible the player got roughed up and the stylus tracking arm could be out of wack too, since it didnt have shipping locks in it...
_________________
Sears 274 & 934(80150,10&11350),sft100,sgt250,sjt090,100,101,200,300,400,vp550, VP4000!
caddy.daddy.fleetwood@gmail.com

[Brian Stearns]

I took cover off and observed the playing of a disc. The disc played wobbly not smooth. So this could be the problem with the turn table. Do I have to tighten the screw on the bottom?

I did this for more than one disc

Thanks for all your help

[SelectaVision420]

the screw at the bottom is to adjust the height of the turntable only, sometimes they can be fixed with epoxy resin if the shaft has come loose of the turntable and is causing the wobble, the turntable is fairly easy to remove
_________________
Sears 274 & 934(80150,10&11350),sft100,sgt250,sjt090,100,101,200,300,400,vp550, VP4000!
caddy.daddy.fleetwood@gmail.com

[Rixrex]

If each and every disc has that same wobble when playing, it is likely the turntable, or within the turntable assembly somewhere, and not the stylus.

If it wasn't too well packed, the turntable often will slip up and down as the package is rolled around. In most shipping, a package is likely to be on its side or upside down for a time. If upside down, and the turntable slips, it is possible for the small flat spacer that sits at the bottom of the turntable to get out of position and cause a wobble, but more common is that the turntable is out of whack.

This is something that can be determined by eye with experience, and sometimes can be corrected easily. It is possible to maneuver the load assembly into a position where the lift arm sits below the turntable and one may manually spin the platter while checking it out, or even remove the turntable for inspection. It's something one must be careful doing for if not reset properly, the platter will block the lift arm, and cause the plastic lift swivel to snap.

Experience is the key here to doing it right, or having someone who knows do it while watching.

[blindfury420]

Just adding some extra info as it may not be the solution. Every time I have had wobble in the picture so far, it has never been the turntable. For me it has always been a bad arm stretcher coil. Its the small dime sized magnetic coil that counter acts? the way the stylus moves up and down on a disc. Its very easy to check. The back of the stylus cartridge touches it when you put a stylus in! With player OFF use a multimeter to check the ohms on the coil! I wanna say it has to be within 90-100 ohms and its good. I will have to check again on the actual numbers, but it is something to try after you try swapping in a different turntable. Or I just thought, an easy way to check if its not the turntable! If ohms are off its not likely the TT!
_________________
I dont own

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

[SelectaVision420]

[Rixrex]

Yep, that can do it, too. I suspected a turntable issue because of the remark about the observations of the disc while playing made by the poster.

[blindfury420]

[Brian Stearns]

Now im not sure if its turntable I saw on youtube a video with similar table motion and nothing was wrong. Thanks for all the tips


http://www.youtube.com/watch?v=xQfH1z4QcvY

Is there ever a slight wobble on your players

[Rixrex]

I didn't take any offense Fury. Don't worry about that whenever you make a suggestion, just go ahead and make it,

That demo video does show slight fluctuation on the discs, but it looks like it's the disc in this case, not the turntable platter. There's many discs with such a slight fluctuation that have no problem playing. To really see if the turntable is out of being perpendicular alignment with the shaft, or bent in some way, one opught to spin the platter with the player off and unplugged while bserving it from the side.

This isn't hard to do but, as mentioned earlier, if not done correctly and returned to proper position, the lift arm can get caught under the platter and break the pin in the lift pivot.

[blindfury420]

Sounds good rick! Just didn't want you thinking I was screaming NO you are wrong haha!
_________________
I dont own

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

[Brian Stearns]

how does one manually make the lift arm go down to see if the turntable is wobbly?

Im new to this so Ill have to take my time

[Rixrex]

The instructions on how to lower the lift arm enough to allow the turntable to spin freely are part of this repair solution regarding lubricating the turntable shaft:

http://www.cedmagic.com/tech-info/repair-solutions.html#jk-unlubricated-turntable-shaft

The catch is that the turntable must be positioned properly with one of the open slots located right above the lift arm in order to allow the lift arm to move back into position without any damage to the lift pivot. This is all explained in step 7, clearly telling you to NOT plug in the player until the lift arm (aka Transfer Rod) is in proper position.

If you do end up taking out the turntable shaft, you must keep an eye out for the small flat washer (aka Thrust Plate) that sits on the bottom of the shaft. It sometimes comes out with the turntable and falls off or sticks to the magnetic ring, as described in this reepair solution:

http://www.cedmagic.com/tech-info/repair-solutions.html#dragging-turntable

At any rate, it will take only one accidental breaking of the lift arm pivot pin to keep you from ever doing it again. If this happens, don't worry too much as it is repairable with a little effort.

[Brian Stearns]

Ok, I follwed the directions given and notice a slight wobble nothing substantial. Could this still effect playback. This small I would think the stylis would ride it out or not be effected. Oh well let see if it is the stylis I sent it away to get it checked over.

[Rixrex]

A slight wobble visible to the eye can translate into a significant issue at the stylus tip, where everything is microsized, and the effect of a wobble can be magnified.

Another check is to advance the styl;us to near the end of the side play. Platters and discs tend to have much less wobble or undulations near the center than at the outer edge. See if the problem is reduced near the end of disc side play.

[Brian Stearns]

Is it fixable or am I cooked? Do I need a replacement turntable?

[Rixrex]

Not sure yet. You need to try the test I mentioned above about moving the stylus closer to the center and seeing how it plays.

I have had discs with a warp that skipped or wobbled only the first 10 mins, then were okay after that. The undulation is always much less nearer to the center of the disc, even with a tweaked turntable.

If you were playing this on a newer TV set, like LCD or LED, then I'd sauggest hooking up to a CRT, because newer sets can have that problem due to signal from the CED player. But typically a CRT does not.

[blindfury420]

[Brian Stearns]

Im using a CRT Tv as mentioned, RCA by the way

For now im just waiting to get my stylis checked and sent back then I will try more testing

[SelectaVision420]

[blindfury420]

I got very lucky and got an awesome oscilloscope for 200 from a good friend
_________________
I dont own

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

[SelectaVision420]

[Rixrex]

I don't fiddle with diagnosing the circuits, my dad used to do that, but most of the electronics equipment went with the shop when the estate was settled. I'm sure it could be useful for diagnosis had we been able to keep it.

Usually if there's trouble with circuits, to the point of rendering the player useless, that player would be a parts player to me. I would go as far as to swap out whole boards, but that's about it.

Dad always talked about how sometimes additional components would fail after some were replaced with new. His opinion was that, once a component needed to be replaced, that the board would eventually act up again in the future, and would always need tending to there on. This was partly due to age and partly to the effect of new parts on the old. I must say he was proven right quite often on this.

[SelectaVision420]

[blindfury420]

[SelectaVision420]

i noticed on the late model vjp/hitachi vcr's they made one of the chips replaceable, i wonder how bad it got before they had to do this, and i dont think i ever saw this sort of thing on any of my ced players...


_________________
Sears 274 & 934(80150,10&11350),sft100,sgt250,sjt090,100,101,200,300,400,vp550, VP4000!
caddy.daddy.fleetwood@gmail.com

[blindfury420]

If I replaced any ic or demodulator in your player there would be a similar stand off inside! I use them as does cedatum. For easy repair should it ever go bad again! Or if it was not the solution you can throw old chip back in no problem too!
_________________
I dont own

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