2GL/2FV/2FW
1-6-7
(2) Drum unit optimization
When replacing the drum unit which was, for example, damaged due to scratches, perform the drum unit optimization pro-
cedure (drum unit optimization sets the proper main charger current control according to the surface sensitivity of the
drum). This procedure is not required when replacing the drum unit in which waster toner becomes full (Self diagnostic
error 7980 [D9] or 7990 [DA]) since the drum unit is automatically optimization.
<Procedure>
1. Turn power off.
2. Open the top cover.
3. Remove the developer unit.
Figure 1-6-9 Developer unit
4. Remove the old drum unit.
5. Install the new drum unit.
6. Close the top cover (without installing the
developer unit).
7. Turn power on. The LED indicators dis-
played developer unit missing error indica-
tion.
READY indicator: Off
ATTENTION indicator: Lit
8. Press the CANCEL key 5 seconds or more.
9. Drum unit optimization is complete when let-
ting go off of the CANCEL key.
[Completion]
* Printer starts idling for 10 seconds. (Idling
can be checked by rotation of FD roller)
[Failure]
* Printer does not start idling. Time to press
the CANCEL key was 5 seconds or less.
Redo from step 8.
10. Open the top cover.
11. Install the developer unit.
12. Close the top cover.
Figure 1-6-10 Drum unit and operation panel
Developer unit
Top cover
Drum unit
Top cover
FD roller
READY
indicator
ATTENTION
indicator
CANCEL key
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