Sharp VL-C780S Serviceanleitung Seite 213

). Extender
Each time the extender SW of the operation PWB is turned ON, camera microcomputer 1C655 pin (14) output
"EXTENDER" is switched to "L" or "H". The A/F microcomputer detects these rise and fall with pin (4) P14 and
outputs the "H" pulse to pin (37) (at rise) and pin (36) (at fall) for about 0.5 sec.
Extender motor driver iIC905 rotates the extender motor in the same phase for 0.5 sec. to mvoe the extender
lens to the 1.5 times side (at rise) or the ordinary magnification side (at fall) (see Fig. 7-2 (n)). IC655 pin (37)
output "EXT MODE" is used for preventing the extender from acting inadvertently when the power is turned
ON or the camera mode and VCR mode are changed. When "EXT MODE" is "L", the A/F miicrocomputer does
not detect the rise and fall of "EXTENDER".
Using camera microcomputer output pin (14)
"EXTENDER" and pin (37)
"EXT MODE" as input, A/F gate array
IC902 switches the output of the "EXT OUT" signal which displays in the view finder the frame showing that
the extender is of ordinary magnification (see Table. 7-2 (b)).
Ic655 @ | | | |
EXTENDER '
EXT MODE
Ic901 & |
IN1 i
>
0.5! sec
Ic901 68 | | |
IN2 i 1 ot
i
' 0.5) sec
ic905 © ti
T
Key
M0
Ic905 @ | |
M1
Figure 7-2 {n). Extender Drive Timing
NORMAL REVERSE
ROTATION | ROTATION
(x 1.5) (NORMAL)
©: Outputting
gate frame
x: Not
outputting
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