Norisound 120 Sound Problem

[Simon McConway]

There's terrible "flutter" on the sound from my Norisound 120 Super 8 projector. Any advice?

[BK]

Check to see if there's any obstruction in the film path, particularly the soundhead under the plastic pressure pad. Could be the belt driving the flywheel by the dc motor that needs replacing, take off the housing and check.

Bill

[dave]

If the film had sound put on from a sound camera the problem is most likely from poor transport in the camera. Try another sound projector as well.

[Simon McConway]

Many thanks for your replies. I took off the back, and there is no belt connected to the soundhead flywheel. The flywheel itself is totally free (no binding) and the projector is extremely smooth running and clean. The main drive belt is also in first class condition. The same film which shows terrible flutter on the projector is absolutely fine on another machine, so we know the fault is with this projector.

[Simon McConway]

I have had a careful look; the rubber roller which presses the film to the capstan (shaft with the flywheel at the other end) keeps slightly hesitating. Plus, I think it could exert a bit more pressure on the film. How do I fix this?