This is topic Sankyo 700 - Runs Great Forward...HOWEVER ... in forum 8mm Forum at 8mm Forum.
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Posted by Jon Addams (Member # 816) on November 12, 2014, 07:13 PM:
...When turned to reverse, the loop is lost and the film rewinds blurry.
Any ideas as to the cause?
Posted by Steve Klare (Member # 12) on November 12, 2014, 08:09 PM:
Wild guess: the clutch of the front spindle is either too tight or stuck entirely.
(It's my story and I'm sticking to it!)
Posted by Maurice Leakey (Member # 916) on November 14, 2014, 09:20 AM:
Top, or bottom, loop?
Posted by Jon Addams (Member # 816) on November 14, 2014, 02:26 PM:
Both on reverse - perfect forward.
Posted by Maurice Leakey (Member # 916) on November 14, 2014, 02:47 PM:
Following from Steve's comment, try taking off the top spool, and then run in reverse to see if you still lose the loops. If so, it could be a problem with the claw.
If the loops remain OK, then I suggest that Steve's suggestions are probably correct.
Posted by Steve Klare (Member # 12) on November 15, 2014, 06:46 AM:
I like that idea, Maurice!
Posted by Jon Addams (Member # 816) on November 15, 2014, 11:08 AM:
Steve and Maurice, thank you very much for your suggestions, here is an update:
I took off the top spool and ran the projector in reverse. In this situation, the projector cannot maintain the upper loop and the lower one becomes a bit larger. Could it be a claw problem? If so, what sort of problem?
Posted by Maurice Leakey (Member # 916) on November 15, 2014, 02:50 PM:
Has this just materialised, or have you recently bought the projector?
I once bought a projector which would run perfectly in forward mode but would not hold a steady picture in reverse. My engineer found that the top claw (of the two claws) was missing, probably broken off.
Posted by Jon Addams (Member # 816) on November 16, 2014, 10:44 AM:
No, it's not a new buy, I bought it a few months ago at a flea market but never got around to test until a few days ago.
A pin is indeed missing. I do have other 700s that I keep for parts with good claws but I have no idea how to replace it. I am technically efficient, I own several service manuals but I have never seen one for the Sankyo 700. I have no idea how to replace that pin but I am going to give it a try as the projector is, otherwise, in mint condition.
Perhaps I can get some pointers here.
Thank you for all of your help.
Posted by Maurice Leakey (Member # 916) on November 16, 2014, 11:12 AM:
Oldtimer Cameras here in the UK can supply a service manual which includes the 700, it's a bit pricey, but they do very good copies.
Posted by Jon Addams (Member # 816) on November 17, 2014, 12:02 PM:
Thanks for the link Maurice, I just ordered it. thank you for the link and all of your help.
Posted by frank arnstein (Member # 330) on November 17, 2014, 08:14 PM:
I have examined the claw on a Sankyo 700 that is here for spares. It only has 1 pin in the claw. So I don't think these Sankyos were made with a 2 pin claw.
Posted by Jon Addams (Member # 816) on November 18, 2014, 04:05 PM:
I figured that one out when I examine another of my Sankyo and found only one claw, I neglected to mention this to Maurice. In any event, I ordered the repair manual and I hope to repair it when the manual arrives.
Thank you for the input.
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