Toshiba 4560 Service Manual page 73

7.4.2 Pulse motor drive circuit (constant voltage type)
Lens motor (M3) (LNS-MOT)
Mirror motor (M4) (MRR-MOT)
Document motor (M11) (DCM-MOT)
DC
24V
In the case of 2-phase excitation, the figure on the
right shows the signals applied to the base of tran-
sistors QA, QB, QA, and QB.
An ON/OFF combination of the transistor is
switched.
The combination of the current flowing phases is
switched.
The motor rotates.
Nov. 1997 © TOSHIBA
Phase A
DA
Phase A
QA QA
~Driven by IC3 (Logic PC board: TD62308F)
~Driven by IC4 (Logic PC board: TD62308F)
~Driven by IC2 (Logic PC board: TD62308F)
Phase B
DA DB
Phase B
QB
TD62308F
A
ON
B
ON
A
B
7 - 11
DB
QB
ON
ON
ON ON
ON ON
4560/4570 OPTICAL