NP 6330 bad image quality

[DadO]

Greetings TECHS,

I have only "one" of those machines in a field and think its ready to be trowed out the job but for time being, it can "stay" a little bit more .

copy count is 255 200k.
drum changed 40k ago.

I have very low density of copies and if i adjust 301(light adjust) and 302(bias adj.) i get more of shadows but same density.
I replaced developer assy and did a general cleaning (especially mirrors) but didn't help. I got 10% better image. I will try whit drum but 40k its nothing for this machine as i saw.

I'm suspecting on charge voltage but can't find any adjustment about it in SM. I need to adj VR switches probably so i ask FOR HELP! if any possible. Witch VR could i adjust. The ones on Power board or on high voltage board?

Thx for any reply !

[djbass]

I always start with the basics, sometimes if you start fiddling with values and adjustments too much you can end up in a worse place than you started.

Drum life is approximately 60k so it should be still ok.

Even though you have already tried some of this I would recommend the following:

1. Clean all of the optics, there are 6 mirrors in total, some techs tend to miss a few.

2. Clean the AE sensor while your doing the optics.

3. Remove the transfer/sep assembly and make sure the transfer corona is clean from toner & dirt, also clean the static eliminator as it has a habit of picking up any loose toner in the machine.

4. If you remove the drum and and look at the cylinder face on you will notice a black plastic spring-loaded roller sitting above its surface, that is the primary charge roller for the drum, if it is grey/white or covered with toner your copies will be light in density. You can clean this roller by doing the following. Unclip the plastic cover from the faceplate of the drum, behind it will be a metal plate held on by three black self-taping screws. When you remove the metal faceplate it will release the drum cylinder so put it in a safe place. This gives you easy access to the primary charge roller which you can clean with an alcohol based cleaner, be careful not to tilt the drum cartridge too much else the waste toner will spill out. When you are done cleaning the roller it should be smooth and black, put the drum back together after this.

5. Reset all the adjustment values to their factory defaults, these should be printed on a label attached to the front door of the machine.

6. Place a test chart on the copier glass and execute 402 (AE adjustment).

7. If the copies are too light/dark after 402, make further adjustments to 304 (AE intensity). A higher setting will make the copies lighter, and lower setting will make them darker.

8. If you feel so inclined you can also make adjustments to 303 (AE slope). Place a sheet of newspaper on the glass, a higher setting will make the copies darker, a lower setting will make them lighter. Most of the time I just use the default value unless there is poor contrast in the copies.

9. If after the above the copies are still not right, only then do I do 302 (DC bias). Higher setting makes the copies darker, lower settings makes them lighter.


As for adjusting the VR pots and such, personally that is one area I wouldn't fiddle with.

[djbass]

Did you end up having any luck with this?

[DadO]

No mate, i will replace their machine whit NP6035 for minimum amount. We have only one of those 6330 and what i saw...it's a crapy machine compared to 6030 and 35 .

I apologize for not replaying since i didn't know the outcome on this case.

thx for reply

[_SuabE_]

Greetings TECHS,

I have only "one" of those machines in a field and think its ready to be trowed out the job but for time being, it can "stay" a little bit more .

copy count is 255 200k.
drum changed 40k ago.

I have very low density of copies and if i adjust 301(light adjust) and 302(bias adj.) i get more of shadows but same density.
I replaced developer assy and did a general cleaning (especially mirrors) but didn't help. I got 10% better image. I will try whit drum but 40k its nothing for this machine as i saw.

I'm suspecting on charge voltage but can't find any adjustment about it in SM. I need to adj VR switches probably so i ask FOR HELP! if any possible. Witch VR could i adjust. The ones on Power board or on high voltage board?

Thx for any reply !

If this is your case you are not using original Photodrum Cartridge hehehe, though you can resolved, do this return all to standard settings, Perform AE, then adjust the toner bias higher value makes you loose the shadows.

[lkrsardis]

NP 6330

You did the right thing by getting tha POS out of the field.

[blackcat4866]

Yes Sir, this is a mutant crossbreed between a NP6221 and a NP6030. They left too much of the 6221 in it.

[yourownfree]

the shield heater around the lamp moved and covered up the lamp intensity detector, rotate it back to proper position so the opening in the shield is allowing the light to hit the detector. You will see what i am talking about, when you look at it carefully.