Quote Originally Posted by BMbikerider View Post
A colour enlarger will also have a 'white light lever' which you can move so that the image is brighter to aid focussing, It will be on the side of the head. Find this lever and move it to the opposite end of the arc to where it is now and check the brightness on the base board. If it darkens then that is your problem.

I use an LPL enlarger which is not all that different and found when I got it there had been little use for a very long time and the colour filters in the head were sticking this may be what is happening with yours, however I would go for the white light lever first and see if that works.
Ya, I know what you mean when you say the 'white light lever' as I am use to kaiser VPM6005 enlarger which has that lever.
I would reckon the knob that on/off the filter to work the same. and it kindof does. and I am quite sure that i keep tha filter on the ON side.

I also tried ignoring the color filters all together and use the more older way of holding the multigrade filter under the lens which doesnt work out as well.