codes sc390 and sc391 for afficio 2035

[akbareshghi]

these error after forced supply toner executing appeared sc390
after executing TD Sensor initialization this code appear sc391
error code my afficio sc390 and sc391 please help me about this errors
thank for attempt

[Comatose]

The TD sensor is reading an abnormal value, this could happen if no toner is getting into the developer unit or it could be a bad TD connection or TD failure. Would suggest checking to see if the toner supply path is working first.

[nqk]

td sensor error
you must check develper unit in an other machine there you got problum if there is also same problum you change your td sensor.othere wise check hupper unit and clean it proply and last one check female conector of dv tank

[maddog3k]

would this make copier reboot ?
on a dsm415pf

thanks