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Discussion Starter #1
I am new to AVS Forum and not sure this is the right place, or even if anyone remembers the above.

I am the proud owner of a 1981 Sony KP 5000 Video Projection System.

A super cool looking all-in-one system that resembles an automatic washer when closed!

It uses 2 CRT's (one Green and one Purple (Red/Blue?), and has no on screen menus that I know of.

Apart from a greenish picture ( even on B&W with the color turned off) and convergence issues, it works pretty well.

Judging from the lack of info on the net. I am guessing that not too many of these are still around.

Anyone out there with info or advice on solving the above picture issues or just old recollections on the above, would be appreciated.
 

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Correction: I think you're the ONLY one with one of these!


I have heard of them, never seen one.


I will guess though that the tubes are probably flat (worn out) and are emitting uneven amounts of light. If you're lucky, you can open the unit and find the G2 controls (master brightness) and balance them out for a better image.


At this point, it's on it's way to collector status more than anything else. I don't think you'll have much luck finding any info, but if you post some pix of the internals, I can probably pin point the G2 controls for you.
 

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Discussion Starter #3
Thanks Curt for your insight. I feel honoured.

I guess hearing it from you and looking at that low serial number, you are probably right.


Here are some photos. It is quite busy in there, but amazingly not much dust.

I was quite surprised to see 3 CRT's in there (2 are coupled to one lens).

I was imagining that some internal magic from the 80's was being performed in there.

Is there an easy way of turning off the color so I can enjoy old TV shows better, or is that not possible due to uneven output?

I would have posted a photo of the image quality but used up my quota.

Thanks in advance.


 

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I fixed one of those up when I was a kid. The main problem was that the optics were dirty. It uses air cooled CRTs and a series of mirrors to combine the blue and green. All were coated with dust and smoke which really cut down the light from the blue and red. After cleaning the optics and adjusting the G2s and drive controls it had a very good picture. It has large CRTs, so they should last longer than most.
 

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Discussion Starter #5
Thanks Andy. You must have been a privileged child working on such exotic equipment!

Judging by the age of the set, I am sure a little cleaning of the optics wouldn't hurt.

I presume the plan of attack would be to remove the 4 (or all 8?) screws right by the label "Do Not Remove Screws!" on the lens assembly, as per photo.

Where would the G2 or drive controls be located? Could I get into much trouble adjusting them, and what would be the proper procedure be?


I don't think the set has had much heavy use and was stored the last few years. It was owned by a little old lady!

As per the attached photo, the picture compared to my old 1991 Sony KV-27XBR50 isn't that bad except for Dr Scott's biliousness.

It rivals the conventional set in brightness, and it actually seems to show more of the picture than the 27" beside it, even though it has spillover of a few inches on the edges of the parabolic screen.

On screen writing seems to indicate a slight out of convergence. Would this be an easy adjustment for someone who doesn't own the service manual?

 

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Hmm, decent focus, impressive brightness, but nasty color balance. If it's not the optics, it could be something as simple as the tint control, or G2 balance.


Does that set have the Schmidt style tubes in it with the phosphor coating on the back of a metal plate, and the mirror on the inside of the tube? If it does, I don't think you can remove the lenses without breaking the tubes. I know a lot of TV's that age used those. But that is a really interesting TV. If you were local I'd love to work on it with you :)


And seeing the brightness of that screen makes me want to try it with a 1031Q or an ECP4500... You'd probably need to watch with sunglasses
 

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Discussion Starter #7
Thanks for your insight Maxx. Not sure what you mean by the Schmidt style tubes.

Tubes appear to be labeled SD-102G, SD-102R, SD-102B.

Being a newbie to projection systems, I always thought that color CRT's were part numbered ending in 22.


As Andy said that he had one apart and cleaned the optics, I imagine that disassembly is possible but to what degree of complexity I cannot say.


Another footnote about this particular set is that in 24 years, it has NEVER been serviced! Although the inside is very clean, dirty optics are a strong possibility.


For your enjoyment, here is another photo without the screen attached.

I can almost imagine Bob Barker with darker hair wheeling it out on The Price Is Right! It was true genius of Sony to make one major appliance look like another! Fully opened however it kind of makes me think of how a flying saucer control console and windshield would look.
 

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That form factor for FPTV sets was not that uncommon in the early 1980's, as the screen is much higher gain than a RPTV. I remember RCA marketed one very similar to this, and of course the Kloss Videobeam was the same concept, except the projector and screen were separate, but still that high gain kinda parabolic metallic style. I still have a Kloss Videobeam, but it died electronically years ago, probably power supply problems.
 

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Man, and you're in Canada. If you ever want to get rid of that, I might just take it, simply to say I have one..



I'll tie my old Beta machine to it..
 

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Discussion Starter #10
Thanks again for your kind words Curt, but it is not on the auction block yet!


Thanks Phototone for jogging my memory on the Kloss Videobeam. Those were the days! Sorry to hear that yours died. I hope it gets resurrected soon!


I am still trying to clean the optics on mine. I am a little leery of proceeding further without the manual. If anyone can point me in the right direction, it would be appreciated.

As the photos show with the outer plastic face removed, I have now come up against a solid metal box. The lens seems to itself unscrew (or is for focus/rotate image?), and the flange that holds the lens also unscrews. If I disassemble further will I have a big job for recalibration? What is the next step? Any thoughts?

Anyone able to locate the G2 brightness controls?

 

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Dude - good news...you are NOT the only one that is left in the world w/ a SONY KP-5000.


I too have just aquired one and have (hopefully), an easy question for someone.


When in the test MODE position and aligning the lines, everything aligns properly EXCEPT the blue lines, which the entire pattern is 30% smaller than all the rest (obviously, that means the blue lines cannot be aligned), so I don't get the 3-D viusal, I get double-vision!


Anyone out there have a clue?


Great box otherwise!!

Thanks
 

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Almost sounds like the deflection yoke slid back on the blue. As far as I know all 3 deflection yokes would be connected in parallel, so they should all be deflecting the same amount.


Could also be the convergence board, I'm not familiar with those sets. But you could try unplugging the convergence board (if you know what you are doing) and see if the blue size returns to normal. Is the picture smaller on all 4 sides, or just top and bottom etc?
 

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And here I am, another Canadian looking for info on this same model. Colour isn't too bad on mine, but the overall picture is getting progressively weaker and weaker, and is at the point now that even in a completely darkened room, it's getting hard to watch anything.


Notwo, thanks for all the pics. I have never has mine open from the back before.


Anyone have any idea if the CRT tubes in this can be rejuvenated? I have access to a CRT tester that can "rejuvenate" some CRTs to get a little more life out of them.


BTW, I'm a noob here.
 

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short_circutz,

You got a PM



Cheers,

Alex
 

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That metal shield should come off to reveal the mirrors and CRTs. I don't remember it being particularly hard to disassemble for cleaning. Nothing is going to fall apart, or get damaged from unscrewing things. The CRTs are regular CRTs and are air cooled with a fan.


From the picture, it looks like the CRTs are strong. The red and blue are combined with the mirrors, so it's not surprising you have too little red and blue. Mine was so dirty there was almost no red or blue. After a good cleaning and adjustment it looked very good even though it was heavily used. Those old front projection CRTs seem to last forever. I kind of hated to get rid of it, but I already had a better projection TV and I needed the money.


The convergence controls are under the front grill which pulls off. I think there were a few more convergence controls hidden the front cover. It's a simple set to converge.
 

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Discussion Starter #17
Thanks a million Andy! Everything was exactly as you described.


The mirror, lenses and CRT's were all fairly dirty. Oddly, the Green CRT seemed to have the most dirt, even though the fan blows directly at the Blue one.

The Green CRT also had the most discoloration. The fan cooled Blue one the least. I guess cooling makes a big difference in extending life spans of CRT's.


I found the convergence controls under the front grill, but can't seem to get the lines to all align properly. On the top of the screen, the horizontal Red line is above the Green/Blue. On the bottom of the screen, the Red is below. In the center they are all converged.


I did not see the hidden convergence controls you speak of, unless you mean the thumbscrews under the lenses.


Another problem seems to be the focus. Where would you start on that one?

I imagine screwing/unscrewing the lenses would be the place to start, but which lens first, and what test pattern to use?


The previously Green picture is much improved after cleaning, although it is still the dominant color.

The focus and convergence are what is really holding back this set from becoming a great performer.


 

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Judging from your pix the focus is as good as it will get. The red needs the height reduced and the linearity adjusted.


I swear I'll buy this off of you..



25 years out of an FP CRT based unit. Who knew?

 

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BTw, can you post a pix of the convergence board? I want to see what you have to work with.
 
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Those tubes don't look too bad. For the convergence, it looks like you need to find the control for the red vertical linearity.


The lenses are probably fixed focus since it is a preassembled tv that has a preset distance to the screen. You probably need to find the electronic focus controls for the CRT's. If you don't know where it is, it will be a thick insulated wire coming out of the tube socket on each neck board and going down to an adjustment block. The focus adjustments may also be near the convergence adjustments.


Please take more pictures of the internals, it's very interesting!
 
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