Minolta XG7 - Page 24

@ Strobe auto
When
the
exclusive
strobo
has
been
completely
charged,
the
mode
selector
circuit
is
shifted
to
Strobo
Auto,
then
the
signal
from
the
strobo
enters
the
indication
circuit
and
control
circuit;
blinking
indication
of
“60”
is
given
by
the
indication
circuit
and
the
exposure
at
the
strobo-tuned
speed
(1/60)
is
done
by
the
control
circuit
when
the
shutter
is
released.
(When
the
bulb
is
used,
however,
the
auto
changeover
to
the
tuned
speed
is not performed
by the function
of
the mode
selector.)
Indication--When
used
in
auto
mode,
auto
sec.
time
is
indicated
until
completion
of
charge,
but
the
changeover
operation
of
the
mode
selector
causes
the
indication
signal
on
the
camera
side
to
turn
off,
and
then
“60”
is
turned
on
and
off
by
the
signal
on
the
strobo
side.
When
used
in
manual
mode,
the
indication
is
off,
therefore
the
indication
“60”
is
turned
on
and
off
by
the
signal
on
the
strobo
side
on
completion
of
strobo
charging.
Speed auto
changeover---When
released
on completion
of strobo
charging, the releasing
magnet
operates
to start the first
curtain. At that
time,
the control circuit
instant-
aneously
operates
to
turn
off the control
magnet
with the
strobe signal,
but the control
magnet is
kept ON
by the strobo
signal.
As the operation
continues,
the synchro
switch
turns on
when
the first
curtain
nearly
completes
its
running, then
the
strobo flashes,
the
signal
from the
strobo to
the control
magnet stops,
the control
magnet turns
off,
then the second
curtain
runs and the mode
selector also
returns
to
the
original
position.
® Electronic SELF
When the SELF changeover switch is set to “SELF”, the mode selector operates to
change the composition of the release circuit to the circuit for self-timer.
When
release
switch
(S2)
is
operated,
the
selfcircuit
operates
and
then
LED
for
SELF
operation indication (LED for B.C indication is used) blinks at constant intervals.
After release switch operation, the release circuit operates 8~12 seconds later to
release
the
shutter.
Then
the
signal
is
given
to
the
self
indicator
circuit
by
the
release
circuit
(self
circuit)
1/4
(about
2.5
sec.)
before
the
total
self-time
length.
The
self-timer
operation
indicating
LED
then
blinks
at
faster
intervals,
thus
giving
a
Previous
notice
for
shutter
release.
® Transistor switch
A
conventional
mechanical
switch
was
operated
by
the
movement
of
the
release
button
or
mirror,
and
the
setting
was
maintained
mechanically.
Chattering
was
liable
to
occur
when
the
switch
turned
on
in
particular.
In
the
case
of
a
transistorized
switch,
having
a
composition
as
illustrated
below,
the
input
(from
circuit
B)
is
electrically
applied
to
the
transistor
to
turn
on
and
off.
Also,
the
setting
is
retained
by
maintaining
the
input
level.
Since
a
transistor
swith
has
no
contact,
it
does
not
include
mechanically
operat-
ing
parts
and
assures
excellent
durability
being
free
from
chattering.
Circuit B
Circuit A