FUJITSU M3093EX - Manual (Page 13)

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2.3 Indicator Functions
Figure 2.3 M3093EX/GX Indicators
2.3.1 Indicators
The meaning of each indicator is as follows:
Power indicator (Green):
Lights to indicate the power is on.
Read (reading in progress) indicator (Green):
Lights to indicate reading is in progress.
Check (device check) indicator (Yellow):
Lights if a device error occurs which may result in a service
call. This indicator blinks if a document is jammed in the
automatic document feeder. This indicator turns off when the
jammed documents are removed from the feeder and the feeder
is closed.
This indicator blinks in four seconds period if the ADF cleaning
is necessary. (See section 5.3.2)
Power
Read
Check