1. Power the machine OFF from the main switch leaving the sub switch ON.
2. Turn main power switch ON while pressing the Utility/Counter key. Keep holding it till the comes up in Service mode.
3. -02 Select process adj
4. -02 Select drum peculiarity
5. -04 Select toner density revert - Select "All On" run that routine.
   max density sensor (Values for toner should be in around 6.4, you might have to run a few times to get it near 6)
6. Press the [Return] key, which is displayed on the touchscreen.
7. -02 gamma automatic adjust (wait for procedure to complete)

Exit out of service mode and go into adjustment at the bottom of the screen.

1. -03 execute adjust operation
2. Select toner refresh mode press ok.