Sharp VL-C780S Serviceanleitung Seite 212

VL-C780S/H/X
VL-C7400E
VL-C690S/HiX
VL-CG6400E
+5V
C906
R991 COMPARATOR
ZOOM T DIRECTION | stop —_| WDIRECTION
icoo1_ © H be
:
Figure 7-2 (k). Zoom Action Detection Circuit
8. Zoom position detection circuit
Zoom position detection is performed using the two micro SW. The micro SWs are switched by means of the
convex and concave provided on the zoom ring, by which the output shown in Fig. 7-2 (1) is obtained. The
output specification of the micro SW is shown in Fig. 7-2 (m) . The output of the SW is directly inputted in A/F
microcomputer 1€901 pins (41) and (42). When
both the outputs of the micro SWs are "1", the A/F
microcomputer judges that the zoom is in the macro area and stops focus action.
Extender
Zoom position 1
Zoom position 2
O-" O———0 OUT
Figure 7-2 (m). Zoom Position Detection SW Specification
54