MON
REV
SW
P.C Board SWl
--
Sensing L
Sensing Pole L
Sensing R
Sensing Pole R
REV
detection
RL6
SW908
Take up side tension arm, detection
of
shut-off position
SW907
Take up
side
tension arm, detection
of
arm lock position
I
SW906
Supply side tension arm, shut-off position
SW905
Supply side tension arm, arm lock position
Reel
size
SW903
Track selector
Pre Amp
SW3
Tape Speed
Tape Speed
SW
UP/DOWN
Counter P
.C
Board
SW3
4-2-2 TENSION
ARM
LOCKING
SYSTEM
(Refer to Figs. 6-32 to 6-35)
The tension arm position
is detected
by
means
of
the microswitch. At the time
of
shut-off, the
tension arm
is
placed in locked position by the
release motor.
If any function key (FWD, REV,
Truth
table
of
BA6109 (IC 5,
6)
Fig. 6-31
FF
or
RWD)
is
pressed when the tension arm
is
in the lock position, the release motor starts
and after the arm comes
to
its middle position
(i. e., the tape
is
loaded), such outputs
as
listed
in Fig. 6-29
will
be issued from
the
terminals
of
ICl.
INW
Pin
IN@Pin
V Out
1G)
Pin
VOut
2
@Pin
H
H
L L
L
H L
H
H
L H L
L
L Open
Open
Fig.
6-32
ARM
POSITION
WHEN
TAPE
IS
LOADING
SW9O8
SW9O5
0
SW907
Fig. 6-33
SW
positions in accordance with the tension arm positions
Position
of
tension arm
SW905
SW906
SW907
SW908
Lock
off
ON
off
0:-i
!
Middle
ON
off
ON
off
Shut-off
off
off
off
of
Fig. 6-34
----------------
SERVICE
MANUAL
GX-747dbx
____________
....;_.
__
_
21
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