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REEL MOTOR
MOTOR PULLEY
LEFT-HANO
REEL O1SK
RIGHT-HAND
Fig. 3-17.
Reel disk drive (reproduce mode)
REEL MOTOR
INTERMEDIATE
PULLEY
LEFT-HAND
REEL DISK
RIGHT-HAND
REEL DISK
Fig. 3-18.
Reel disk drive (fast-forward mode)
REEL "MOTOR
INTERMEOIATE
PULLEY
LEFT -HANO
REEL DISK
CONTROLLER
REEL DISK .
. a
H | oL
L
H | Forward rotation
L
L
'
Forward rotation
: a
L
H
H
Reverse rotation
3-9-2. Motor drive circuit
See Fig. 3-20.
The motor drive circuit uses the motor reversing
IC described in Seotion 3-4. With control signals
supplied from the controller, the logic gates of
the IC automatioally control the direction and
speed of the motor rotation.
First, let us examine the input Sanat of (CU914.
a. In PLAY mode
The H-tevel output at pin 11 of the controfler
is transmitted to input terminal RIN of U914.
via U901G and U901L. On the other hand,
the L-fevel output at pin 13 of the controller
is transmitted to input FIN of U914 via pin
13 of U913 and resistor U901B.
b. in REW mode
The H-level developing at pin 5 of 913
is
transmitted to RIN of U914 and the L-level
Of U913's pin 13 to FIN.
c. In F.FWD mode
The H-level developing at pin 13 of U913 is
~"transmitted-to-FIN
ofW914 'and the L-Aevel
of U913's pin 5 to RIN.
Feble-3-9-summarizes the -states-of-the input
signals described above.
Output signals
oe Fae ear fveorey eer Moors
=x
a
Table 3-9.
Motor reversing operation
Fig. 3-20.
Reel motor drive circuit
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