Bolex SM8 Super 8 Projector

 According to the BolexCollector.com, the SM8 was a magnetic sound projector capable of silent or sound playback of Super 8 film, and allowed audio recording onto magnetic striped Super 8 film. The SM8 was later modified (approximately in 1970) to include a variable level erase head and different lamp. An accessory sound mixing console and external 6-8W/5 Ohm speaker was available separately, for both models.

The unit came in with the user saying "It turns the reels but it doesn't project." So, it was put on the bench and taken apart. A short inspection of the base functionality was done:

1. Plug into a current limited power supply.
2. Turn the unit on and observe the current flow. All seemd good.
3. Turn the knob to start projection. There was no projection light

So the lamp was removed and tested to see if the filament was good using an ohm meter. The lamp tested ok. Obviously it was not getting any power.

The light bulb power wires were traced back to the on-board step down transformer. The transformer has taps for 12v a.c. to power the light bulb. The voltmeter showed a healthy 12v. So where was the power being lost? Time to investigate the bulb holder.

Once the cardboard cover was removed, it was clear to see where the problem was. The copper contacts were badly corroded. So, the contacts were carefully removed, cleaned and put back together again. Instantly, it came back to life.

The projector was then carefully cleaned and upon doing so, it became clear that a piece of old film had become trapped in the feeder.

This was carefully removed.

As the owner wanted to enjoy his old family Super 8 films for some time to come, a new 12v/100W Halogen bulb and built in dichroic reflector was procured and installed.

A look inside the left hand side panel reveled that the three drive belts and become brittle and broken.

So new belts were procured and fitted. How that is done can be read on here. Finally, the bearings were oiled and the felt pads cleaned.

The memories I have as a child, watching old 8mm movies from the past, were absolutely priceless. Glad that this family can enjoy their memories for time to come.