8mm Forum: sankyo stereo 800/gate assembly.

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Posted by Andrew Wilson (Member # 538) on July 13, 2006, 06:40 PM:

hi there,after putting a new gate assembly into my sankyo800
i now have come across another problem.
the lower loop doesn't form correctly;that leads to the film
jumping in the gate.
does any other member know how to over come this?.
please help!i am at a loss on how to proceed.andy.

Posted by Jan Bister (Member # 332) on July 13, 2006, 11:53 PM:

Hmmmmmmm.

Did you have a previous problem with your Sankyo 800 that you were attempting to fix by replacing the gate assembly? What did you replace exactly, how, and why?

Does pushing the thread/loop restore button do anything at all (with the film already threaded and running)?

Posted by Andrew Wilson (Member # 538) on July 14, 2006, 03:22 AM:

hello jan,yes youre correct.i have had trouble with the 800s
gate before.i replaced the gate assembly because ALL films were
jumping in the gate.
the reason i replaced the whole thing is for that reason.
the plate;thats the one with the frame cut in it,for the light to pass;that was very loose indeed.
most films contiue to loose the lower loop
even after pressing the thread lever down.
the sankyo was checked last year by an expert who gave
it a clean bill of health,after checking the claw
cam etc.cheers andy.

Posted by Kevin Faulkner (Member # 6) on July 14, 2006, 03:56 AM:

I think Jan will agree that this sort of problem is caused by one of a few things. Insufficient Gate pressure, Insufficient Claw Protrusion or even an out of aligned gate assay with over or under pressure at the gate edges.

This is where you really need a service manual so all these points can be chaecked. I have heard that wear on the gate pressure plate can cause these porblems. Removal and a good polish may help.

Kev.

Posted by Andrew Wilson (Member # 538) on July 14, 2006, 04:24 AM:

thanks kev.i'll give them a try.what is recommend for polishing
said gate.andy.

Posted by Jan Bister (Member # 332) on July 14, 2006, 07:13 AM:

* agrees with Kevin *

[Smile]

Posted by Craig Hamilton (Member # 258) on July 14, 2006, 10:13 AM:

Andrew, I had the same problem with my Sankyo 700. It was the gate pressure that needed adjustment. Over the years the pressure springs had become slightly week & required a little stretching.

Craig

Posted by Kevin Faulkner (Member # 6) on July 14, 2006, 03:49 PM:

I think Craig is probably spot on with that diagnosis so try that first. I use TCUT to remove any burrs or rough patches and then just buff that stuff up.

Kev.

Posted by Jan Bister (Member # 332) on July 15, 2006, 08:16 AM:

* agrees with Craig *

Posted by Andrew Wilson (Member # 538) on July 17, 2006, 02:32 AM:

Hmmmm;now the damm thing is out of focus?.andy.
i think the screws are too tight?.

[ July 17, 2006, 03:59 AM: Message edited by: Andrew Wilson ]

Posted by Craig Hamilton (Member # 258) on July 17, 2006, 06:06 AM:

Andrew

When you say out of focus, do you mean the complete image or just one half of the screen?

If it is the latter, make sure the pressure plate is fitting flush with the gate. A little press with your finger may click it in to position.

Craig

Posted by Andrew Wilson (Member # 538) on July 17, 2006, 08:02 AM:

half of it is out of focus.andy.

Posted by Craig Hamilton (Member # 258) on July 17, 2006, 02:41 PM:

OK Andy, look to make sure that the pressure plate is sitting flush. Try pressing the top & bottom of the plate it will probably click in to place.

Failing that, visually check that it is sitting evenly top & bottom.

Craig

Posted by Andrew Wilson (Member # 538) on July 18, 2006, 07:58 AM:

Almost there craig;not quite.andy.

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