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it is hard to explain but there is a metal pin on one of the mechanisms it can become bent out of place. you need to remove it and heat it up and put back straight. dont try to bend it straight as it will snap or the pin will come out of the metal part.
I know this post is old but I found a solution. The axle going to the sprocket is locked up with something sticky. You have take out the two screws holding the white plastic piece around the sprocket. Then loosen the small bolt on the big wheel on the other side. Remove the big wheel. Try to push the axle through to the other side. If it doesn't budge easily, hammer it out. That's what I had to do. Then clean it up real good with solvent, like alcohol. Lube it with grease and put it all back together. Worked for me.
A bit unusual for the projector to stop responding to the remote.
Usually it follows when someone has opened the projector, they forgot
to reconnect the controls from the case top which also includes the IR
receiver. If it isn't that, it could be a broken IR pc board or
bad connection. I've seen that.
The worst case is that the IR controller on the main board has failed
and if that's the case, you'll have to live with it as the cost of a
new board is very high.
in slide projector smooth movement of mechanism is rule number 1 .1-spray contact lubricant cleaner on forward and backward switches and press them many times.-open it and clean it with air blower and clean piece of clothes.apply good type of light grease in levers-cams gears-confirm all mechanical parts is in good condtion.change any broken part from nearest store. best regards