Pulse Motor Dirve Circuit - Toshiba 1550 Service Manual

7.4.2 Pulse motor dirve circuit (constant voltage type) (M3, M4)
Lens motor (M3) (LMS-MTR)
Mirror motor (M4) (MRR-MTR)
DC
24V
The diagram on the right shows signals impressed
to QA, QB, QA, and QB bases in two-phase exci-
tation.
The ON/OFF combination of the transistor is
switched.
The combination of phases to which the current
flows is switched.
Motor rotates
1550/1560 OPTICAL
~Driven by IC5 (Logic PC board: TD62308F)
~Driven by IC4 (Logic PC board: TD62308F)
Phase A
DA
Phase A
QA QA
Phase B
DA DB
Phase B
QB
TD62308AP
A
ON
B
ON
A
B
7 - 18
DB
QB
ON
ON
ON ON
ON ON
Mar. 1998 © TOSHIBA