8mm Forum: Sankyo 700 - Runs Great Forward...HOWEVER ...

This is topic Sankyo 700 - Runs Great Forward...HOWEVER ... in forum 8mm Forum at 8mm Forum.

To visit this topic, use this URL:
https://8mmforum.film-tech.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=1;t=009548

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. [Mad]

Any ideas as to the cause?

Thank you

Posted by Steve Klare (Member # 12) on November 12, 2014, 08:09 PM:

Hi Jon,

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:

Hi Maurice,

Both on reverse - perfect forward.

Thank you

Jon

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?

Thank you

Jon

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:

Hello Maurice,

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.

Jon

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.
http://www.oldtimercameras.com/camera-instruction-manuals/stock/Model.asp?Model=11001&ModelPage=true

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.

Jon

Posted by frank arnstein (Member # 330) on November 17, 2014, 08:14 PM:

Jon

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.

dogtor frankarnstein
[Wink]

Posted by Jon Addams (Member # 816) on November 18, 2014, 04:05 PM:

Hello Frank,

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. [Wink]

Jon

UBB.classic^TM 6.3.1.2