C6500 red color problume

[muhammad.imran]

hi
dear all
i am realy in trouble i have problume with colors spacialy red its print orangesh. i tried every thing gamma adjustmeny,gamma offset, contone,
calibration,but there is no effect i hope u guys can help me to come out from this prob.

[Setright]

Try the printer gamma offset adjustment, the manual way. I bet the automatic adjustment has put in too much yellow.

[muhammad.imran]

dear
thanks to reply but i hav been done this adjustment i reduse the yellow value even -50 and i increase magenta value and i checked it with diffrent adjustment values but still i foraway to perduce a red color and machine is still new 30 thousand print only

[Setright]

Okay, you need to think about replacing the gamma sensor. (It's part of the rail that also holds the colour registration sensors.)
Try doing a full calibration, with the ColorCal including the scanner, OR by using a spectrometer.
Then look at the graphs for each colour. If the lines flatten out toward max density, the gamma sensor is defective.

[HORSE]

Yes check the colour registration assy. This contains the Gamma sensor and the 2 colour registration sensors.

If the assy has an 'M' stamped on it with black ink this is the modified type....if the assy has a pink spot label then it has the old type Gamma Sensor and you will hav to replace it.

modified part A03UR79800

[totoro]

I agree, if your red is orange and your blue is purple then do as Setright and HORSE suggest.

[21043]

hello!

try to increase humidity in room.

for example, "tunr on" electric teapot with opened top cover and let water to boil out (about 1 liter), then wait 5 minutes and try to print red colour.

it realy helps with C500 pro and CF5001.

[HORSE]

hello!

try to increase humidity in room.

for example, "tunr on" electric teapot with opened top cover and let water to boil out (about 1 liter), then wait 5 minutes and try to print red colour.

it realy helps with C500 pro and CF5001.


I agree get the customer to boil the kettle for a nice cup of coffee while you change the gamma sensor....

[muhammad.imran]

HI
guys thanks for ur reply i took gamma sensor, and registeration sensor assembly from 6501 i checked it with 6500 and i calibrate autocal but same color. humudity is already enough. one thing i noticed when run gamma sensor adjustment (auto) the cyan and magenta DC bais value only 240,238and yellow , black is 480,520

[21043]

already enough - how much?

humidity has to be not lower 40% - from my experience.

[copier skills]

I had the same problem. I calibrated using the es1000 and the colors came right in.

[noklasony]

hi guys
i hav same problumes and i hav done all thing that u people discused .
i also increase the AC devloping bais(under process fine adjustment)
i already replaced HV board,and registeration assembly M type
but dears i still have same prob if people need more information please ask .

[noklasony]

hi dear
i calibrate the engine and fiery also but problume still there .
one thing i noticed red color of test print 1 withh 255 yellow,and 255 magenta is also orangesh. i did all adjustment gamma,gamma offset,dot1, contone ,every thing i replaced HV board. so now can any one help me

[muhammad.imran]

hi guys
this is me again after pause but still i hav prob. i did every thing that u people told me. i orderd to koncaminolta new M type gamma sensor assembly i replaced it and i run all adjustment gain but prob still there and i already mentioned machine internal test print red color also orangesh
sooooooooooo what i can do now can any one tell me pls

[Bizhub]

HI
guys thanks for ur reply i took gamma sensor, and registeration sensor assembly from 6501 i checked it with 6500 and i calibrate autocal but same color. humudity is already enough. one thing i noticed when run gamma sensor adjustment (auto) the cyan and magenta DC bais value only 240,238and yellow , black is 480,520


Firstly ensure that the machine is correctly setup and all drums devs etc are in good condition, then Calibrate with a densitometer and check the outputs. Konica-Minolta have admitted to me that red's can be problematic on c500 and c6500's

[noklasony]

thanks dear
but i have replaced all drum developer and transfer belt,even i checked these all units an other machine these are working good. i calibrate with ES 1000 but no use you know what machine internal test print itself not good and all things that i have done i mentioned my earlyer posts tell me what i can do more

[21043]

http://www.copytechnet.com/forums/konica-minolta/17993-bizhub-pro-c500-orange-problem.html

[random]

So you have replaced the Gamma sensor did you do a Gamma sensor calibration and adjust the offsets? Your not going to see any change if you don't do atleaset the gamma sensor calibration and your must reset each screen before you perform this.

[noklasony]

dear sorry but i think u never read my earlier posts
i did these calibration not one many time bt dear no effect thats why i am realy feel i have done every thing so please tell me what i can do more

[random]

dear sorry but i think u never read my earlier posts
i did these calibration not one many time bt dear no effect thats why i am realy feel i have done every thing so please tell me what i can do more

Yes but you did not say you reset the screens in gamma sensor calibration. You have done this?

[noklasony]

hi dear
oh realy i never mentioned this but i did this every time i know the importance this by the way thanks 4 calibration issue its done.
i thought may be ican overcome this prob by calibration with 1000 but i faild this red color made me crazy.if u dont mind we can chat my yahoo id is Bloom4.heart@yahoo.com