BT BF900 - Manual (Page 54)

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Pages come out wrinkled, frequent jams or
the machine picks up two pages at once
Check that you are using the correct size of
paper.
Check that your paper is not already creased.
The alarm light stays ON and the display
shows CHECK PAPER and PRESS START
Load more paper and press the START button.
If this does not work, check that the cassette
tray is installed properly.
Display shows TONER LOW
Replace the toner cartridge.
Display shows ENGINE ERROR
Switch off the machine for a minute then switch
back on. If
ENGINE ERROR is still displayed, call
a service engineer to fix the problem.