help with a 2901

[denise]

I need help with the blacks not black. They are blue.The machine is old and no service in a while.

[Magenta]

1st thing to check with any machine is chemistry. Time temperature and concentration, Time is taken care of by the rack, has it reached temperature? Check the recirculation filters are not clogged.  Is it fresh chemistry or been sitting in the machine unused and unloved for some time.

In the Old days you processed a control strip and read it with a densitometer comparing the readings with a master supplied. You could spot problems with recirculation replenisher rates before it showed in your work. A black art these days.

Most don't know how or do this so  simply process some paper 1st fogging the leading edge. Leave 1 inch sticking out the magazine when you load the magazine,  Noritsu's will normally ask do you want to feed lead paper, YES. The unfogged paper should be white, the fogged paper black. If its not your chemistry is no good and needs replacing. The test paper has not been exposed by the machine so its should be black. If it is black and only looking blue on images exposed by the machine then its a set up issue

[Big Dave]

Magenta has great suggestions.

We had days of very low prints and started getting a similar blue problem.  So, we added 2 liters of fresh CD replenisher to the CD working tank.  Brought back the blacks very well.  Added 0.5L, do daily setup, still blue-ish, add some more, repeat until it looked good (enough).  Just to be safe, we added some fresh BF to the BF tanks to even it out.

Is it an SM machine or an RA machine ?  If it's RA, just use the CD from the replenishment tank.   If it's SM, it's tougher, but still do-able.  1) buy some CD replenisher mix or 2) pull the right chems out of the correct SM pack nozzles, do some math, mix it up and pour it in.

Good luck !