Fixing a super 8 projector from the 70s

Warning! Do not try any of this at home! Messing with internals of electronic devices is dangerous and can lead to electrical fires, serious injury and even loss of life.My dad started using a super 8 film camera as early as 1967 (the system was launched in 1965). He stopped doing it in the 1980s as it became pretty much impossible to buy film. Ever since then the films have been stored in multiple cardboard boxes in his basement. Recently he moved to a smaller apartment so all the films and related hardware had to go somewhere else. Namely, to me. Here is a representative sample.The picture does really not make justice to the projector. It is perhaps the only household appliance I have ever owned that could survive a head-on collision with an IBM Thinkpad from the 2000s. The projector weighs 10 kilos and consumes 200 watts when running, half of which is taken by its halogen light bulb. For comparison a typical modern LED light bulb consumes less than 5 watts.The projector has not…