Singer S900 Manuel D'instruction page 40

OPERATION BUTTONS
When sewing without having the foot controller connected, the machine starts slowly when the start/stop button is pushed. When
it is pushed again, needle moves and stops at its highest position.
When using foot control, simply press foot pedal with your foot until you reach a slow even speed. The harder you push, the faster
the machine will sew. Release pressure on foot pedal to stop the machine.
PROGRAMMABLE NEEDLE UP/DOWN BUTTON
Push it again to stop needle at up position.
REVERSE/TACKING STITCH BUTTON
*
Reverse sewing is carried out while the reverse stitch button
is pushed.
The machine will continue to sew in reverse as long as the
reverse button is pressed.
The sewing machine makes 4 tiny tacking stitches to tie
off the sewing on all patterns except straight, zigzag and
buttonhole stitches. The position of the tacking stitches will
be at the exact spot in the pattern where the reverse/tacking
stitch button is pushed.
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Reverse stitch button
Programmable needle up/down button
Interruptor de posicion de aguja parada
Bouton de marche/arrêt