Brother Simplicity SB3129 - Nothing Appears in the LCD; Operation Beep

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Nothing appears in the LCD
If nothing appears in the LCD when the sewing
machine is turned on, the brightness of the LCD is
either too light or too dark. If this is the case, perform
the following operation.
1
Turn off the sewing machine.
2
While pressing (back key) in the
operation panel, turn on the sewing machine.
3
Press (–) or (+).
Adjust the brightness of the LCD so that the
screens can be seen.
4
Turn off the sewing machine, then turn it on
again.
Operation beep
Each time a key is pressed or an incorrect operation
is performed, a beep is sounded.
■ For a correct operation
One beep is sounded.
■ If an incorrect operation is performed
Two or four beeps are sounded.
■ If the machine locks up, for example, because
the thread is tangled
The sewing machine continues to beep for four
seconds. The machine automatically stops.
Be sure to check for the cause of the error, and
correct it before continuing to sew.