Canon NP2120 Service Manual page 57

3.
The lens drive motor is a stepping motor and
rotatesin responsetothedrivepowersignal(LNSTB)
and pulse signals (LNA. LNA, LNB, LNB).
D C controller P C B
5 3 0 8
5 4 0 1 ! ,k i""'" 1
LNA -3'
M o t o r driver P C B
Figure 3-15
C A N O N HPZ120/ZMO R N . 0 MAY 1990 PAINTEO I N JAPAN IIMPRIME AU JAPOHI
O P E R A T I O N S ANO TIMING RSSZ
Tostartthelensdrivemotor, LNSTBgoes'l'; and
the motor is rotated by applying pulses on each
phase in sequence.
When the lens drive motor is at rest, LNSTB is '0';
the motor is supplied with current by way of R418 so
as to hold the lens in place.
-1 B