Minolta XG7 - Battery Capacity Check Procedure

6. Magnetic release
With
the
contact
piece
attracted
by
the
permanent
magnet,
the
permanent
magnet
is
temporarily
demagnetized.
Then
the
contact
piece
operates
to
release
the
mirror
box.
Condenser
Cy
is
charged
through
R,
beforehand.
When
Tr,
in
operated
by
the
release
circuit,
condenser
Cy
serves
to
create
a
magnetic
field,
opposite
to
that
of
the
perma-
nent
magnet,
on
the
magnets
provided
around
the
permanent
magnet.
Then
the
permanent
magnet
is
temporarily
demagnetized
thus
releasing
the
contact
piece.
. Over-rang lock
When
release
switch
(S;)
is
turned
ON,
Cy
is
charged
at
a
high
speed,
and
the
release
circuit
operates
on
completion
of
charge.
In
the
case
of
over-range
non-interlocking
operation,
C,
is
discharged
not
to
operate
the
release
circuit.
When
over-range
LED
is
lighted
in
the
indication
circuit,
Tr
operates
as
well
and
C,
is
shortcircuited
at
both
ends.
Therefore,
C;
will
not
be
discharged
and
the
release
circuit
will
not
work.
Indication circuit
. Memory circuit
This circuit stores the output of calculation circuit into condenser (C,) through VR,
and Tr switch.
The calculation circuit output (voltage corresponding to shutter speed) is charged into
condenser (C,) through VR; and Tr SW. But Tr SW. is turned OFF when Tr, is
turned ON. and the calculation circuit is isolated from condenser (C,). Then the
shutter speed is memorized.
Calculation circuit