Minolta XG7 - Page 29

23
12. Bulb mode
A
bulb
switch
(Ss)
is
installed
in
the
power
source
holding
circuit.
On
turning
off
of
the
holding
circuit,
priority
is
given
to
“B”
over
the
control
circuit.
And
second
curtain
release
is
done
by
release
switch
(S;).
When
the
shutter
speed
dial
is
set
to
“B”,
bulb
switch
(Ss)
is
turned
OFF
and
the
metering
operation
circuit
is
shifted
to
Manual.
Next,
when
release
switch
(S,)
is
turned
ON,
the
voltage
is
detected
to
operate
the
release
circuit,
and
the
shutter
opens.
While
release
switch
(S;)
is
ON,
T,
operates
and
Mg,
is
ON
(open).
When
release
switch
(S;)
turns
off,
power
supply
to
the
control
circuit
is
cut
off
because
the
power
source
holding
circuit
is
OFF.
Then
the
shutter
control
magnet
(Mg)
turns
off and the second curtain starts running.
Metering
circuit
Release
circuit
T
13. Magnetic SELF
14,
For
ordinary
photography,
the
release
circuit
is
operated
as
C,
is
charged
(high
speed).
The
circuit
composition
and
the
shutter
speed
have
been
changed
in
this
self-timer.
When
the
mode
selector
switch
is
set
to
“Selftimer”,
the
self
switch
(Sq)
turns
ON
and
Tr
switch
turns
OFF.
Next,
when
release
switch
(S,)
is
turned
on,
Cy
is
charged
through
C,.
And
the
release
circuit
operates
8~12
seconds
later
to
activate
the
release
magnet
to
operate
the
shutter.
The
indication
LED
blinks
by
the
function
of
the
SELF
indication
circuit
consisting
of
C,
and
resistors
in
series.
When
the
charge
voltage
of
Cs
has
reached
a
certain
level,
the
composition
of
indication
circuit
changes
causing
the
blinking
intervals
of
LED
to
become
faster.
Tr. SW.
ee
|
SELF indication circuit
Remote-control
In ordinary photography, metering switch (S, or S,,) turns ON and release switch
(S,) turns ON and then the shutter is operated. In remote control operation, the
metering switch does not turn ON, therefore power is supplied to the metering circuit
after release switch (S;) is turned ON.