2500C has patchy light band on right side (front side) of 11X8.5 sheets

[Solotime]

As the title says this machine is intermittently leaving a band about 3 inches wide where there appears to be poor transfer of toner. For example the sheet I am looking at is printed near solid red in this area and the red has a light and grainy appearance to it and so appears almost pink. It just looks like there is poor transfer of the toner to the paper. I do not beleive it is a fusing problem as the area above and below where the paper was left white is clean and the poor quality area has no gritty feel or anything to it. Also it seems if the fuser were bad enough to cause this it would not come and go. This area is on the right side of an 11X8.5 sheet so the problem would be to the front side of the machine. I am hoping someone has seen this type problem before on this model. I service this customers Minolta copiers and they have this 1 Toshiba Color machine they asked me to look at. The real problem is it does not do it all the time so it is difficult to stop the machine mid copy for example to see if the defect is on the trans belt or just the paper. Does not seem to matter what colors they are using so I do not suspect a drum or DV unit. Althought he did mention that he has removed the drums several times to clean them....with blanket wash! LOL. Overall CQ is perfect. 120K total copies on the machine 62K Color/58K Black.
I have included a sample where you can see the area.
Thanks!

[michaelc]

Re: 2500C has patchy light band on right side (front side) of 11X8.5 sheets

Might just be the magenta/yellow unit needs a clean (main charger etc) and the mag roller checking over. If you print out some half tones in print test mode it will hopefullu show up the unit causing the problem hopefully.

[JustManuals]

Re: 2500C has patchy light band on right side (front side) of 11X8.5 sheets

This Parts & Service manual can be purchased for $12.77 and downloaded immediately after payment from

http://www.justmanuals.com

Paul@justmanuals.com

[Solotime]

Re: 2500C has patchy light band on right side (front side) of 11X8.5 sheets

Calibration test prints look fine for the most part. Like I mentioned it does not do it all the time. Perhaps I need to try another set of them to see if I can catch it. It is not just the red. I have seen other sample pages they gave me where the same problem occured while printing very dark blue, almost black.

[michaelc]

Re: 2500C has patchy light band on right side (front side) of 11X8.5 sheets

If you use print test mode 0+4 and turn on. use codes 231 and 237 to print off the pages. I use A3.

[Mr Spock]

Re: 2500C has patchy light band on right side (front side) of 11X8.5 sheets

2500c pm cycle is 50k so if it has not been pm'd I would start there. New drums, developer, main charge grid/needle electodes, etc. Also pull and clean the rollers in the transfer belt unit and make sure all the mods have been done. Then run all the calibrations and see if it returns.

[razzer]

Re: 2500C has patchy light band on right side (front side) of 11X8.5 sheets

if you run some monocolor prints are all colors affected?