8mm Forum: Norisound 120 projektor running slow

This is topic Norisound 120 projektor running slow 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=011999

Posted by Peter Malling (Member # 6233) on January 06, 2018, 09:49 PM:

Hi, and thanks for the membership. I filmed super 8 when I was a kid, and now I've found my old Norisound 120 projector. It runs, but quite unevenly, and sometimes it almost stops the film advancement, I think it's impressing that it's still working after all these years, but what could be the reason that the motor is slowing down in speed? Anything I could do myself about it?

Posted by Paul Browning (Member # 2715) on January 07, 2018, 07:36 AM:

If its stood for so long the rubber belt if this is what drives it will be an odd shape, and cause uneven running, not familiar with this Noris machine, can you upload a picture. I was told by an projectionist that you can restore the shape of a rubber drive belt by boiling it in hot water?, so I tried this, and it worked to a point, it did regain its circular shape after looking oval shaped ......

Posted by David Roberts (Member # 197) on January 07, 2018, 01:01 PM:

I believe the 110/120 noris had a fault on their motor control boards that was corrected on the later 310/320. I think a transistor failed on the earlier board.
I always liked the noris super 8 sound projectors.Very good hum free sound and very bright picture from the 100 watt lamp,also very quiet running.

Posted by Barry Fritz (Member # 1865) on January 07, 2018, 01:09 PM:

Can you remove the drive belt from the motor pulley? If you can, do so and run the motor. If the motor does not slow down with the belt removed, the motor is likely OK. If the machine has not been used in many years you may have grease on one or more projector components that has turned solid. I have seen old grease that is stiff and hard as glue.

Posted by Peter Malling (Member # 6233) on January 07, 2018, 06:50 PM:

Thanks for your kind replies. It sounds as if I should check the drive belt, which I will do one of the next days. I'll also upload some photos of the projector.
I really liked the Norisound, I was very careful choosing this projector. It also had quite good sound editing capabilities and, yes, it was quiet, particularly in 18 fps.

I am so happy I found this forum. Great that there are still people out there who has interest in Super 8!

Posted by Bill Allen (Member # 6959) on May 03, 2019, 10:36 AM:

Hi. I am trying to repair a Norisound 120 motor control board. Would anyone possibly have any further information as to a repair manual, schematic, or the control board itself?
Any information would be appreciated.
Thanks...Bill Allen

UBB.classic^TM 6.3.1.2