Service manual

THEORY
SERVICE MANUAL
Electrical
2-13
6.3. Line Feed Motor Control
The line feed motor drive circuit is shown in Fig. 2.11. The line feed motor is powered
by +24 VDC. Each of he four phases of the motor is excited when CBIC (#8), via ports
LF-A, B, C, and D, outputs to turn on the darlington transistors Q23 - Q26.
This provides a path to ground through the transistor, which allows current to flow.
When the printer gate array outputs a LOW, the transistor remains off.
Fig. 2.11 Line Feed Motor Drive Circuit