Werbung
720 (W, FS) |
SAFETY PRECAUTION
The following precautions should be observed when servicing.
1. Since many parts in the unit have special safetyrelated characteristics,
always use genuine Hitachi's replacement parts.
Especially critical parts
in the power circuit block should not be replaced with other makers.
Critical parts are marked with y% in the schematic
diagram,
and circuit
board diagram.
2. Before returning a repaired unit to the customer, the service technician
must thoroughly test the unit to ascertain that it is completely safe to
operate without danger of electrical shock.
EXPLANATION
OF NEW DECK CHASSIS
1. Power-assisted control mechanism
1) When
the playback
button is pressed, the playback slider
shown
in Fig. 1 slides in the direction of the arrow
@.
After this. the gear-drive arm and the playback lock plate
slide in the directions of arrows @Q and @
and lock in
the positions shown in color, by means of the playback lock
plate.
At the same time, the motor switch turns *ON'" by means
of the movement of the lock plate, the motor starts and the
fly wheel rotates in the direction of arrow
®
(Fig. 2).
2) As the gear-drive arm slides to the position shown in color
by Item 1) as shown in Fig. 2. the shaft A, which is attached
to the playback gear moves along the inclined surface of the
gear-drive
arm
to make
the playback gear rotate in the
direction
of arrow
@®
so that 1 or 2 teeth of the gear
engage the gear of the flywheel.
The engaged
gear wheel
which has been engaged rotates
because
of the
flywheel,
and
continues
to rotate
in the
direction of arrow @© :
3) Fig. 3 shows the connection of the shaft of the playback
plate and playback arm which operate the head plate and
pressure roller.
Following
the rotation of the playback gear. the shaft B.
which is attached to the playback gear, rotates in the direc-
tion of arrow
shown in Fig. 4, whereby the playback
arm slides in the directions of arrows
@
and
. and
the playback plate. which is connected via the shaft. slides
in the direction of arrow
shown in Fig. 3.
Gear-drive arm
-—Stop mode
y
— Playback mode
iaeuiea
}
Lock plate
:
Playback slider
Fig.
1
Flywheel
Shaft A
Shaft B
——
Stop mode
——~ Playbacs mode
Fig.
3
Werbung
