Toshiba e-STUDIO520 Service Manual page 256

Control signal of developer unit motor
• DEVON signal:
This signal switches the on/off of the developer unit motor. When this signal moves to a low level,
the motor is rotated, and when this moves to a high level, the motor is stopped.
• DEVCK signal:
This signal is a reference clock which keeps the developer unit motor rotation at a constant speed.
When the cyclic change of the FG pulse period against this reference signal is within ±6.25%, this is
defined as a lock range (= the normal rotation of the motor). When the cyclic change is within this
range, the LED on the driving PC board of this motor is lit.
• DVMBK signal:
This signal applies a brake on the developer unit motor. When this signal moves to a low level, a
brake is applied to the rotation of the motor.
e-STUDIO520/600/720/850 DEVELOPER UNIT
12 - 10
March 2005 © TOSHIBA TEC