blue color in not printing in spc420dn

[vargue]

hi fellas yesterday my customer told me that blue color in not reveled in page . i went there and test page also not revealed .all colors full. and no add toner signal did any one see that befor

[davel]

Yes. What did you check.

[vargue]

a777777777777777777777a

[eddy out]

I have had a pcu do this before on this machine.

[Mark Bbb]

Remove all pcu's and transfer unit, clean and check all, reinstall...
Same issue?
Perform music

[TonerMunkeh]

Preferably something by The Commitments or Elvis.

[DougD]

Here are some ideas to help you get started.

[Iowatech]

Do you know if there was a new cyan PCU installed in that machine recently?
If that isn't the case, what follows is probably wrong and stupid, sorry about that.
If the cyan PCU was recently replaced, it could have been stored in a place that had excessively hot temperatures, which can cause the toner in the developer to soften. Then when the PCU is moved to a place with more appropriate temperatures the toner will solidify, which will cause the developer to turn into a solid rather than the powder it is supposed to be. As the developer is hardened over the TDS, the machine will never detect that it needs to add toner, but the color supplied by that PCU will be absent.
Sorry, I wasted an entire day on a different manufacturer's machine with this very same problem, so I think that is pretty important.
It also could be caused by a fault in the PCU drive (if the drum or developer roller aren't turning this type of problem can happen) or the drum ground (if the laser can't discharge the drum, no toner will be attracted to the drum).

[tcs04]

Preferably something by The Commitments or Elvis.

Elvis has left the building!