Carriage Motor Drive Circuit - Epson L-1000 Technical Manual

REV.-A

2.2.5.5 Carriage Motor Drive Circuit

The LQ-500 employs the STK-69816, which is a hybrid IC used to drive stepper motors. STK-6981B (IC8C)
drives the stepper motor with a constant current. The value of the current is determined by an external voltage
level. The IC operation can be separated into phases AB and CD, which are completely equivalent. Phase CD
is described here as a model. Figure 2-35 shows the carriage motor drive circuit. Figure 2-36 shows the
STK-6981 B circuit diagram
LQ-5001 L-1000
Figure 2-35. Carriage Motor Drive Circuit
PRINCIPLES OF OPERATION
2-35