Seiko Instruments SII Black-and-White Raster Plotter LP-1020 - Manual (Page 252)

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If "BOTTLE MAINT. STARTS" appears
In order to prevent the waste toner from accumulating unevenly in the
waste toner bottle, this device provides a maintenance function that taps
the waste toner bottle to level the waste toner when the specified amount
of print is executed.
Though the waste toner maintenance function has been set in the factory
so that it starts automatically when the specified amount of print is
executed, you can change the setting so that a message to prompt you to
perform the maintenance appears. In this case, the maintenance does not
start unless the key is pressed. ( ⇒ page 6-6)
■If "MANUAL" is set
The message shown below appears to prompt you to perform the
maintenance of waste toner bottle.
If the key is pressed, the message is switched and the maintenance
starts.
The maintenance is performed for about 30 seconds, and taps will be
heard during the operation.
■If "AUTO" is set
The maintenance of waste toner bottle starts automatically, and the
following message appears on the screen.
B O T T L E M A I N T . S T A R TS
P R E S S E N T E R K E Y
B O T T L E I S T A P P E D .
W A I T A M O M E N T .
B O T T L E I S T A P P E D .
W A I T A M O M E N T .
Press the key.