Rollei P350 A slide projector will not advance to next frame

Hi all.
I recently acquired a Rollei P350 A slide projector with the remote cable. Everything was working up until now, when the automatic advancing of the slide has stopped working. Every time I either press the advance button on the projector or the remote, it does not do anything, however the focusing switch on the remote functions normally. I have also checked all the fuses, made sure the projector was on the right voltage and everything was plugged in. If anyone could provide an insight onto why this is happening, it would much be appreciated. Thanks.

Could be mechanical, as simple as a slipping belt, or electrical.

There is no way around opening your projector and watching or metering for what is going on...

I have a similar Rollie projector that i have not used for a long time. This did the same as yours and it appears that it is very sensitive to the type of magazine that you use. In particular the Old Agfa LKM type where movement forward is quite short and it gets out of step with itself and jams up..

Agfa to my knowledge did not use the LKM tray, but the Universal tray and later their CS tray.