Cause

Toner low density (C-2451 Yellow, C-2452 Magenta, C-2453 Cyan, C-2454 Black)

Resolution

Toner Density Revert

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. -06 Select toner density revert - run that routine.

(When the machine gets the values for each colour, the values need to be in around 1.26, as near as possible, keep pressing start until you get the values for each colour as near as possible, doesn’t have to be exact)

    for 5500/6500 - should be under sensor output check - density return mode
    max density sensor
6. Press the [Return] key, which is displayed on the touchscreen.
7. Exit Service mode to return to normal operation

Gamma Automatic Adjustment

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 process adjustment
4. -06 recall standard data
5. -02 drum peculiarity
6. -06 toner revert all on
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.