Brush Motor Drive - Toshiba 1550 Service Manual

10.4 Brush Motor Drive (M9)
The toner motor is provided to supply toner to the developer unit.
The toner motor is driven by 2SC2873Y (Logic PC board: Q19).
1
The (+) and (-) terminals of the motor winding is connected to +24V and pin 2 of Q19, respectively.
• When pin 1 of Q20 becomes "L", pin 2 of Q19 also becomes "L".
• A collector current flows from the +24V supply through the motor winding causing the motor to ro-
tate.
• When pin 1 of Q20 becomes "H", pin 2 of Q19 also becomes "H", causing the current flowing through
the motor winding to flow to the +24V supply through D13.fThe current decreases with a time
constant determined by the inductance and resistance of the windingfcausing the motor to stop.
1550/1560 DEVELOPER
+5 VSW
2
Q20
RN2401
3
10 - 10
+24V +24V
R1
(+)
D13
Toner motor
2
(–)
1
Q19
2SC2873Y
3
DG
Mar. 1998 © TOSHIBA