AR-P350, AR-P450 (serv.man25). Procedure to convert machines using AR450DM (50K Drum) to AR451DM (100K Drum). (Corrected) - Sharp Copying Equipment FAQ (repair manual). Page 5

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Press the “Back/C” Key.

Press the “Menu” Key 15 times.
The display should read “MNT CYCLE SET”.
Press the “OK” Key.
Use the UP/Down Arrows to change the value to the one shown on the chart.
Press the “OK” Key to set the new value into memory.
Press the “Back/C” Key.

Press the “Menu” Key 1 time.
The display should read “LIFE OVER SETTING”.
Press the “OK” Key.
Use the UP/Down Arrows to change the value to the one shown on the chart.
Press the “OK” Key to set the new value into memory.

Press the “Menu” Key 9 times.
The display should read “PROCESS SETTING”.
Press the “OK” Key.
Use the UP/Down Arrows to change the value to the one shown on the chart.
Press the “OK” Key to set the new value into memory.

Press the “Back/C” Key.
Turn the machine Off/On.

The 100K Drum (AR-451DR) must be installed in the machine.
The AR-451DR can be identified by a white mark on the rear side flange
and by the aluminum base being slightly exposed on the front side as
shown in the pictures below.