KM c2525 grey background.

[aabarnes1]

K dev unit siezed up and ruined the pcu aswell. Replaced the 2 units and still got slight background. Even tried a known good itb, still got grey background--but not every copy! latest fwu done and all colour reg/ auto grey adjustments done. Any suggestions please lads?

[banginbishop]

ok - just to check the background IS black? because i've got a m/c doing this but mine is through my own fault and the dev being shot on all the colours. I cleaned out the drums and dev units, returned to fit a drum and the dev units were covered in toner again so i ran a load of individual colour sky shots and screwed the 3 coloured drum units up (c/m/y) also print a report to make sure the nobody has changed the defaults for transfer toner replen etc.

[blackcat4866]

Check simulation 131, Auto. It monitors developer density. If any of the values differs by more than 25 points replace that developing unit. And yes, I've seen a magenta developing unit cause gray background. It sounded strange to me when I heard it, but it is true.

For primary charge issues run simulation 089, Gray, and do single color prints halftone images C, M, Y, K. Watch for a pattern that repeats at 38mm intervals. Any void areas in the feed direction are caused by a dirty slit glass for the appropriate color.

That describes 90% of all the quality issues on Voyagers. =^..^=

[aabarnes1]

I'm back at this monday am so I'll post back with any findings thanks

[techpro]

Try updating to the latested firmware Jan 2010. There is a new mode in sim 147 that you can turn on so the K and I think yellow drums rotate backwards everyonce and awhile, I'm thinking this is to help with toner building up at the cleaning blade. HOpe it helps.