Sony PS-X7 - Page 5

Lowering of tonearm onto record
The central axis of the push rod resting against
the tonearm lifter is on the position © in
STOP mode. (See Fig. 1-5.)
During lead-in, the main lever moves across in
the direction of arrow 6) (See Fig. 1-3),
resulting in the position of the central axis of
the push rod moving across as shown by arrow
: @). (Fig. 1-5.)
tonearm lift
push-rod
' fever
main lever
ap)
G3
2
Pa X return cam
movement of
the main lever
Fig. 1-5.
guide-push
lead-in lever
18)
17cm
©
~~
25m
eo
oe
(SS
30cm
size
selector
o
7
©
MANUAL
=
stylus tip
_- selector link
SONY-00830 / DRUCK 1
| PS-X6/X7 PS-X6/X7 |
3. The guide-push stopsat the position determined
by the surface © (Fig. 1-6) of the record size
selector cam. The push rod consequently
descends to the lower position ©) of the
main lever (Fig. 1-5), resulting in the tonearm
lowering onto the surface of the record for the
commencement of play.
4. The position where the tonearm lowers (30 cm, -
25cm, 17cm) is determined by the position of
the record size selector cam shown in Fig. 1-6.
The guide-push of the lead-in lever moves across
in direction of arrow during lead-in, and
meets the size selector cam at surface © (for
the 30cm example shown), thus determining
the drop point at the outer edge. of a 30cm
record. That is, this position determines the
distance moved by the lead-in lever, which
consequently determines the rotational angle
of the brake drum (and of the tonearm as well).
With the record size selector knob set to the
MANUAL position, the lead-in lever moves
a little and the tonearm does not move.
5. The attaching shaft of the guide-push is not
positioned at a center of the guide-push and
the edge of the record size selector cam is
formed a curve, so the fine adjustment of the
stylus drop-point can be performed by turning
the guide-push.
Operation During Return of Tonearm
Although the return operation can be activated
in 2 different ways, the operation itself is the same.
@ Tonearm made to return during playing of a record
by touching the START/STOP button.
@® Automatic return as a result of the tonearm
activating the record end detector mechanism
(luminous sensor record end detector).
1. While the record is being played, the main gear
and main lever are in the positions as shown in
Fig. 1-7.
2: If the START/STOP button is touched during
play, or if the record finishes playing, the
systems control circuit is activated. A current
flows through the solenoid (PM), and the kick
lever moves in the same way as at the beginning
of record play (see Fig. 1-2). | This time,
however, the sub-gear (R) is pushed back and
engaged with the center gear, thus rotating the
main gear again in the counterclockwise direc-
tion.
3. The gear guide axis at the tip of the main lever
is moved across to position ) by following
the curved path Q) due to the guiding action
of the shaded portion of the groove in the
heart-shaped cam positioned on the main gear.
The main lever. consequently moves across in
the direction of the arrow @) (see Fig. 1-7).
4. At this time, the push rod is forced back up
onto the main lever, resulting in the tonearm
lifting up from the record surface.
gear guide axis
main lever
rotating direction of
the main gear
main gear
Fig. 1-7.
5. The return cam attached to the main lever
(see Fig. 1-5) pushes against the pin of the
brake drum, forcing the tonearm to move back
(horizontally) towards the arm rest.
6. The return operation is completed when the
tonearm arrives back at the arm rest. The
main gear. comes to a stop in the position
shown in Fig. 1-3.
Brake Mechanism (Operation of brake lever)
A fixed amount of braking is applied to the
brake drum in order to assure smooth travel of the
tonearm during both lead-in and return.
Furthermore, a spring is also employed to exert
pressure upon the main lever in the direction of
arrow (see Fig. 1-8), thus keeping the main
gear in the stop position. (See Fig. 1-3.)
brake drum
main lever
Fig. 1-8.
Record End Detector Mechanism (Luminous Sensor
Record End Detector Mechanism)
(see Figs. 1-9 and 1-10)
This record end detector mechanism consists of
a lamp, a photo-conductor (CdS), and a shutter
connected to the shaft of the tonearm. Changes in
position of the shutter (due to the gradual inward
movement of the tonearm) results in changes in the
amount of light received by the photosensitive
element. When the stylus runs in the lead-out groove
of the record, the tonearm suddenly moves across by
a relatively larger amount, resulting in a sudden
increase in the amount of light striking the photo-
sensitive element, exceeding a preset value. An
electronic circuit is consequently activated, resulting
in current flowing through the solenoid.
n turning direction of the
Ci tonearm during play
tonearm
“mal
regs)
conductor
shutter lamp
Fig. 1-9.
turning direction of the
tonearm during play
i
tonearm
a
i
shutter
CF}
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small amount
farge amount of
lof change lamp change
Fig. 1-10.
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