E-studio 650 density problem

[makaule]

Everything was ok after replacing dev and OD, run about 50K copies, then sudden poor OD cleaning and lots of black spots on copies - it seemed like overtoning, cleaned everything, replaced OD cleaning blade and lowered 05-201. Inserted all units and copier asked me for toner. Toner tank was empty - inserted new one - black spots remained Performed 05-290 and other tests, checked all counters.. Black spots dissapeared, first copy is fine but all others becomes lighter and lighter.

[emujo]

Everything was ok after replacing dev and OD, run about 50K copies, then sudden poor OD cleaning and lots of black spots on copies - it seemed like overtoning, cleaned everything, replaced OD cleaning blade and lowered 05-201. Inserted all units and copier asked me for toner. Toner tank was empty - inserted new one - black spots remained Performed 05-290 and other tests, checked all counters.. Black spots dissapeared, first copy is fine but all others becomes lighter and lighter.

Silly questions...did you reset drum count, and is the drum blade in the cleaning position, and is the erase lamp functioning? EMujo

[makaule]

yes, everything is ok. Counters were resset. Drum cleaning is ok. Led array is fine. It seems that everyhing started when toner became empty.. I scanned 2 copies to show you example of what is going on.. Made black copies - as you see in 2 copy image becoms lighter, lighter.. Any more ideas ?

[ivovb]

Light copies in most cases for this model are connected with:
1. Old developer. Change developer along with OD.
2. Old transfer belt. Try to clean it but may be it is better idea to change it. You can stop copy under drum and check that image is ok on the drum.

BR

[makaule]

Thanks.. But the problem is that: developer, drum, all fuser unit, and transfer belt, charger grid and wire ,were changed 50K ago, all counters were reset and everything was ok till today..

[ivovb]

Still check image on the drum if it is ok. This will show you if the problem is in transfer or not. Also there is a mod for rear terminal of main charger.

BR

[makaule]

Thanks for good advice and refreshing my memory.. There's big chance that problem is in charging, remembered that few years ago had similar problem with e-45.. I'll check it tomorrow and'll write if it helped.

[toshibadale]

Also, check the glass above the drum unit. Many people do not know about this glass, and when it gets dirty, it shows up after a PM with lite copies.......

[ToshibaTech]

Yeah def. clean the slit glass and def. clean the IQC/SPC sensors on the rail that look down at the drum. And run 05-290 if you did not. Also I have seen problems with DV bias and build up on the mag rollers you can just scotch brite them. Hey make sure the auger in your toner hopper is not broke. If you hold it in your hand with the door open and run 03-102 toner should just pour out if not the auger is probably broke. It might get enough toner to keep running but run in a constant undertoned state or sometimes ask for toner.

If that doesn't work scan the test chart again in gray scale it's kinda hard to tell in 2bit.

HTH!

[emujo]

This is a little wierd, image quality looks like toner is not being added (or not enough) as copy process goes on. Your 1st image is quite dense, so we can eliminate optics and probably laser (I assume there are no laser codes). But you mention that the toner hopper is being emptied. Does the toner bottle intermittantly turn as a large run is being processed? Possibly, you have a problem with the patch sensor, patch is formed but sensor is not detecting enough density. Did you vaccuum the patch sensor? Is there any developer in the waste bottle? What happens if you print an internal test print (PCL Font list for example) after copy quality drops off, is the fill as bad on this print job? Are you seeing intervals where the machine just sits and runs with a please wait message? Let us know. EMujo