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 Post subject: VP-1000 (Looping video)
PostPosted: 02 Nov 2019, 21:42 
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I am new to Laser Discs. I acquired a Pioneer VP-1000 top loader player from a recycling center recently. After getting an adapter to use the composite video output on the player (The Channel 3/4 switch for R/F was missing and R/F produced a very poor signal), I found that I was receiving a viewable picture and good audio quality, but had a major issue. On any disc tested, it is impossible to view past a certain point. When the disc reaches a certain point (usually only a couple minutes into the video), it will skip back several seconds every time it reaches the exact point. The scan function and the chapter search function do not allow for the disc to go past this point either. I have cleaned the laser diode as well as the discs, and this slightly improved picture quality but did not allow the disc to progress further.

Does any one know what the issue could be, and how it could be repaired?

Thank you
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 Post subject: Re: VP-1000 (Looping video)
PostPosted: 03 Nov 2019, 03:05 
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Did you try skipping past that point through chapter select? Cause it sounds like it could be a mechanical issue, something preventing the laser assembly from moving.
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 Post subject: Re: VP-1000 (Looping video)
PostPosted: 03 Nov 2019, 07:37 
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takeshi666 wrote:
Did you try skipping past that point through chapter select? Cause it sounds like it could be a mechanical issue, something preventing the laser assembly from moving.


I think he tried already: The scan function and the chapter search function do not allow for the disc to go past this point either.

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 Post subject: Re: VP-1000 (Looping video)
PostPosted: 03 Nov 2019, 10:23 
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I don’t have any experience with these helium neon based players but here is something to consider..

Does the issue always occur at the same exact time (CLV) or frame (CAV) point of the discs you are playing? If it does, maybe there is something obstructing the movement of the pick-up assembly. I would consider unplugging the machine and gently push the pick up assembly with your hand to see if it starts to bind up at certain points along the way. If it does, check for dried up grease and even see about opening the player from below to see if any wires are getting in the path of travel.

If the issue occurs at all random points on the disc (it doesn’t appear you have indicated that), it possible there is an alignment issue That can be anything along the path of the laser as it travels through prisms and mirrors. It might simply be a bad laser tube that maybe shuts down after so many minutes being on.
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 Post subject: Re: VP-1000 (Looping video)
PostPosted: 03 Nov 2019, 13:20 
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I followed your advice and found that it does indeed bind up at numerous points along the laser assembly's movement. I found that if I moved the laser to a certain point, it would move up in the video, but eventually get to one of its binding points and loop. Additionally, I found that tilting the player to one side or the other moved the video along when the laser could not do so, and that when ejecting, I usually need to tilt the player to the left so that the laser assembly can return to its origin point and allow the tray to open up. I will need to open the player up so that I can access to the laser assembly and see if an object or dust is blocking it.
Is it possible that the assembly would need to be lubricated, and if so, how would that be done safely?
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 Post subject: Re: VP-1000 (Looping video)
PostPosted: 03 Nov 2019, 19:07 
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I think you're going to find the pinion gear is broken. This typically occurs when the player is shipped without the transit screw.
When you take the bottom off, you'll see a motor assembly on the edge of the slider assembly. Taking off the 4 screws will allow you to lift off the motor assembly. Flip it over and you'll see the gear. Part #62 in this picture.

This gear was used in all Pioneer built top loading players. VP-1000, LD-600, LD-1000, LD-1100, PR-8210, LD-V1000, LD-V1001, Magnavox VC-8010 & Sylvania VP-7200. The only difference was the VP-1000 version was a hollow gear and easily broken. The other players were solid and much more sturdy.


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File comment: VNL-028 (#62)
IMG_2358.JPG
IMG_2358.JPG [ 79.33 KiB | Viewed 125 times ]
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 Post subject: Re: VP-1000 (Looping video)
PostPosted: 04 Nov 2019, 20:40 
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I pulled out the motor assembly and found the pinion gear. The gear seems to rotate normally after being moderately moved, and is in seemingly good condition from a visual inspection. Is the pinion gear broken from something else, or is it in good condition?


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 Post subject: Re: VP-1000 (Looping video)
PostPosted: 05 Nov 2019, 02:25 
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I think Blam is speaking of the plastic gear that connects to that pinion gear.
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 Post subject: Re: VP-1000 (Looping video)
PostPosted: 05 Nov 2019, 16:36 
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I found the small plastic gear in question, and did find that it does not rotate properly and may not be secure. If I knew how to retrieve the gear it would likely be a straightforward process to design and 3D print a replacement. As it stands currently, I am unsure how to retrieve the gear as it is underneath two metal pieces that are attached to the slider assembly. Is the only option removing the entire assembly?
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 Post subject: Re: VP-1000 (Looping video)
PostPosted: 05 Nov 2019, 21:32 
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Yes, the plastic gear under that assembly. That entire assembly should be held on with just a couple of screws. It does not connect to the slider itself. Once the assembly is off, the gear is held on with a C clip.

The gear is in direct contact with the slider assembly and should be spring loaded. Simply trying to spin it won't work. You can pull assembly back from the slider and then see if it rotates smooth and freely. If it wiggles back and forth or doesn't seem round in it's rotation, that is indeed your problem.
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 Post subject: Re: VP-1000 (Looping video)
PostPosted: 05 Nov 2019, 22:24 
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Thank you for the instructions. I found the gear in question, and found that the gear on the left of the picture is not even attatched to the teeth of the slider. Obviously it will require a replacement. The question is, what design will be needed aside from the gear with an appropriate amount of teeth?


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 Post subject: Re: VP-1000 (Looping video)
PostPosted: 05 Nov 2019, 23:26 
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Yup, that's what mine looked like too.

Don't worry about the inside design. I think Pioneer intended the inner portion to provide some amount of buffer, but all it did was break under pressure. Pioneer realized their mistake and filled in the pinion with plastic on future models. As long as the outer diameter and teeth pitch are correct, and the center shaft is the right size, you can 3D print a replacement.
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 Post subject: Re: VP-1000 (Looping video)
PostPosted: 06 Nov 2019, 14:26 
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What size does the center shaft need to be? Does it just need to be large enough for the metal gear I posted earlier to fit inside?
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 Post subject: Re: VP-1000 (Looping video)
PostPosted: 06 Nov 2019, 23:46 
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On the assembly you lifted off to find that gear, there should be the rest of the gear on a post held on with a C clip. The gear on the motor drives the outside of this pinion which in turn drives the sled.
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 Post subject: Re: VP-1000 (Looping video)
PostPosted: 07 Nov 2019, 14:05 
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Here is the remains of the gear with the motor gear attached. I have not been able to free the gear. Where is the C clip?


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 Post subject: Re: VP-1000 (Looping video)
PostPosted: 07 Nov 2019, 22:24 
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It's the little black disc. It has a slit in it and you can just pop it off with a pair of tweezers.
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