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problem etalonnage in my dks 750


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first of all - check if your densitometer is working properly.

a) Light on the densito lamp for 2 minutes.

B) go to SU / Settings / Densitometer / Measurement

c) put the calibration chart inside dryer machine, press start, lower the dryer  - and wait for card going out and reading results.

if the readings are correct - go for the solutions given above.

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Is this problem on all paper widths ?

I would first try to copy papier.ini from the backup CD to the C:\DKS\parametres over the existing one.

Also it would be good to check densitometar measure and calibrate it if it is out off the tolerance +/-3 from the values on the original calibration chart, but pay attention if the values on the chart corresponds to the values in the calibrating menu.

When doing the measurement first clean the densitometar sensor and check the values in the Green on the gray channel in the raw acquisition table which should be around 1500 or higher, but it should not be bellow 1200. This will give you the light intensity value and the state off the fiber optics cables.

Also what is important is good state off the soft rollers in the dryer (specially around the densitometar lamp), because the constant speed is very important when reading the paper setup chart, but also the sensor near this lamp should be clean as that one is responsible for starting the measurements, but also to count the prints coming out off the paper processor.

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If the values in the raw acquisition table are all 0 then maybe one off the fiber optic cable is broken or out off its socket in the junction between the one in the dryer and the other short one which is coming from the tank PCB.

Check that junction and also you can check each cable by lighting the one end with the lamp, if the cable is OK, then you should see the light on the other side off the cable.

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  • 2 weeks later...

I resolved the same problem on one Kodak System89 (DKS1550) and on the end it was the problem with the broken short fibber optic cable, I cut it and put it directly in the filter box which is attached to the tank PCB, but off course because it was shorter I had to also change the position off the junction piece inside the cover where tank PCB is, and I use the hole for the short fiber optic cable to pull in the long fiber optic cable from the dryer into the tank PCB area and off course I added few plastic straps so that  this junction is not touching some PCB. Actually I think this is better place for this junction then original one, because the cables are less bent then before.

But to find out is there a problem with tank PCB I used MonTestdks2.exe which you can find here: C:\Dks\DKS\Constantes\Tools\Diag_Impag\, initialized the printer and check the analogic signal values. When everything was assembled before changing (shortening) the cable the values for all 3 colors were 0, but when I removed this filter box immediately the values raised just from the light in the shop, and when I lighted this RGB sensors on the tank PCB with the torchlight they raised even more. This test proved me that everything is OK (at least at that point) with the Tank PCB and the IMPAG2 PCB.

Also it is possible to check the reading on the Tank PCB by measuring some voltages:

Cell amplifier outputs:

The voltage measured on these pins is approximately 0 V in the dark and increases according to the lighting level (about +8 V at 1000 Lux).

For information. the values measured on a machine fitted with a new chart and lamp are as follows:

Measurement Measurement White Gray Black

Red channel Pin 10  J 13 IC 6    pin 1 6 V 3 3

Green channel Pin 12  J 13 IC 15  pin 1 5 V 3.1 2

Blue channel Pin 14  J 13 IC 15  pin 7 5.8 V 4 2.9

Regarding the DKS750 you should find similar utility DKS_MON.exe, but I do not remember how to check densitometar readings using that utility ?

After that I started checking the fiber optic cables using the torchlight and releasing all the ends from short end long cable and that test proved me that long cable was in perfect state, but the short one was very damaged and very little light come out off it. Because I did not had a spare short fiber optic cable with me, I just cut it as precise as I could and put it in the filter box inside the aluminum cylinder were the original cable was positioned  :)

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