Copy/Print Problem with Bizhub 501

[ebm]

You need to press "start" after entering value. Machine should run for awhile as it adjusts the toner density in the dv unit.

Before you do that however, check your developer unit and DV drive. There might be something wrong with DV drive or DV unit if you are getting error when running TCR adjustment. Confirm that DV511 developer and DR510 drum was used so as not to overlook the obvious causes.

[backspace]

Normaly,after set tcr value i press 'start' but machine freeze (it says 'operating' but nothing happened) or start working and after few minutes gets error 5.
Drum and developer are replace month ago but problrm remaining(i wrote in first post).
Few days ago we try to change some parts from other bizhub 500 and with replaced developing unit and transfer coronas,print was good with full tone.
When we try to back one of this parts print was same as before (no full tone).