Service-Manual_artista_630_640_english_V4.01_032069_50_04.doc
16
2.5 General functions of the PCBs
The microcomputer on the S-Print receives an analogue signal from the foot control which is converted
into a digital signal and reported as a nominal value. The motor r.p.m is adjusted to the required value by
comparison of the predetermined and actual values. When the foot control is released (nominal value
zero) the microcomputer switches on the electrical brake. The motor is stopped very quickly in the
required needle position.
On switching on the sewing/embroidery computer, the stepping motors may be in any given position. The
microcomputer control memory may also have any given value. The stepping motors are moved to their
pinning position by means of a command from the microcomputer to give a defined situation. This position
is then registered and set to zero in the memory. This zero position then allows any stitch program to be
selected and sewn.
The S-Print controls the processes between the individual stepping motors, evaluates the signals of the
sensor and shows the results on the display.
RET-Print (return
)
P-Print
The P-Print accommodates
the synchronizing disc light
barriers, and the motor and
sensor connections.
The RET-Print
accommodates three
buttons and the upper
thread indicator light
barrier.
