From a read of a discussion on Discussion went on on 2008

Community > Forums > Film and Processing > Processing - home > jobo colorstar 2000.

It is a nice timer; it really is more useful as a analyser. It's successor, the 3000 I own. It has buit in digital memeories, the 2000 uses a plug in pack of potentiometers.

I use my colourstar 3000 in b& w mode all of the time; I do not know if the 2000 has a black and white mode.

I calibrate the speed (set the pot) so that the analyser sets the suggested time for me when I meter the negative at the spot where I want the first suggestion of tone in the highlights.

I do this by setting the probe under the enlarger with the neg in place projecting to the size that I want, but with no filter in place.

The unit is calibrated by printing a print that has such highlight detail, and then setting the probe on that spot without having changed the enlager settings that produced the print, then adjusting the analyser sensitivity until the analyser suggested time matches the actual time that the print was exposed at.

Once the analyser is calibrated, the time that it suggests can be manually varied after it is automatically set, before the timed exposure is made.

My 3000 also can be put into denisitometer mode, and thus read off between the thinnest and densest portions of the neg to suggest what paper grade/filter settings you may want to start with to get a good print.

Your cold light set up may have warm up lag that may impact how effectively the timer can work with your set up. If you get variable contrast by using two tubes with different colour output there will also be challenges in analysing the negs with this analayser.

Ephotzine has a copy of the manual for sale; it will be needed to figure out the key sequences that are used to set the enelyser into its different modes.
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