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Eject
In play after stop, the head slider ass'y (37) remains at
the
DPSS
position
and
the
combination
head
8B (4) is
put in the cassette half. To eject the cassette half, the
combination
head
B (4) must
be moved
downward
to
, take out the cassette half.
Operations for ejection of the cassette half are described
below. (See Fig. 26.)
,
1)
when the left top of the cassette lid (211) is pushed,
the lever (90) moves in the direction of the arrow.
This moves the lever (94) and lifts the sub-eject G
slider (38). The slope (u) of the sub-eject G sidier
(38) pushes the DPSS slider (47) in the direction of
the arrow (J) and lower the head slider ass'y (37)
from the DPSS position to the position to which it
was put immediately after mounting of the cassette.
' This puts the combination head B (4) out of the
cassette half. If the left top of the cassette lid (211)
is pushed
during
playing, the portion
(h) of the
DPSS slider (47) is forced against claw of the head
slider ass'y (37) to prevent the cassette lid from
being opened.
Forward/Reverse Sensing Mechanism
Fig. 28 illustrates the forward/reverse sensing mechanism
in forward mode.
In reverse mode, the reverse slider (46) moves in the
direction of the arrow so that the direction sensing switch
(S621)
is turned
off.
For
display
of forward/reverse,
turning
on
and
off of this switch
(S621)
is utilized.
Reverse lever pulling coiled spring (50)
Leaf switch B (S621)
Leaf switch B (S621)
'
C5)
Forward/reverse
sensing switch
Sy
Leaf switch B
($621)
O
\
\
Switch is depressed.
In forward mode, the direction sensing switch (S621) is
pushed by the reverse slider (46) and is turned on.
Fig. 28
Photo-transistor B (0824)
KN-S4W
Quick Reverse Sensing Mechanism
This mechanism senses the leader tape portion in start and
end of winding
of the tape and inverts the combination
head
B (4) instantaneously.
The cross
section
of this
mechanism is shown in Fig. 30.
If no tape is present at the tape guide (36), current is
supplied to the LED B (D672). The light passes through
the transparent
resin reference
pin. It is reflected
by a
45° plane and reaches the photo-transistor B (Q824) inside
the tape guide (36).
If the magnetic surface of the tape is positioned at the
tape guide (36), the light from the LED B (D672) is block-
ed by the magnetic surface to prevent the light reaching
the photo-transistor
B (Q824). As the leader tape portion
of the tape comes to the tape guide (36), the light from the
LED
B (D672)
passes through
the transparent
or semi-
transparent
leader
tape
portion.
The
light reaches
the
photo-transistor
B (Q824) and current flows through the
photo-transistor B (Q824).
Turning on and off of this current is sensed by the quick
reverse circuit and the combination head B (4) is inverted
instantaneously.
Mechanical chassis
(801)
LED B (D672)
Reference pin
Connected to
Tape
circuit.
LED printed
circuit board (70)
Tape guide (36)
Photo-transistor
printed circuit board (70)
Connected to quick
reverse sensing circuit.
Fig. 30
Leaf switch B (S621)
Forward/reverse
sensing switch
Reverse slider (46)
Fig. 29
LED illumination
re
oo
eee
tats
ca lisa
che w i i , u s Mia
ah hints
e a e Leal
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