Hi, I just bought my first enlarger off ebay, it's a Lucky 90M. It looks to be in great shape, but, and I'm probably being dumb here, but I'm not sure how it turns on. There is no instruction manual included. Does anyone have a manual and/or know how to turn it on? I know that some have no on/off switch, and work when plugged in, using the timer to shut on/off, but when I plug this in, it still doesn't switch on, changed the light bulb and nothing changes. Thanks!