Hi everyone, first time here and need your expertise. I bought and assembled the enlarger myself a a while back maybe upto a year ago and didn't get a chance to actually use it until now. So I was going to make a few contact sheets, but the paper came out blank, so I thought i didn't expose it long enough. Second time around it still came out blank and thought maybe I didn't actually pour developer in the tray and turned on the light. The paper turned black very quickly so that wasn't it. Next I noticed that I had left the lever for the light source as white light and switched it to filter and no light shined through.. This lamp house comes with the filters already integrated and you use a knob to change the filters. The whole head came already as one piece, so I know it wasn't something gone wrong during assembly. So why do I get light with the white light but no print and no light at all with the filters? The manual is very short, sticks to assembly and does not answer my questions in any way. I appreciate your time and answers.