M E C H A N I S M D E S C R I P T I O N - Pioneer PL-100 Service Manual

4 . M E C H A N I S M D E S C R I P T I O N
PL-1OO MECHAN ISM OPERATI NG
The PL-100 is equipped with auto-return only.
Fig. a-t shows the PL-100 in the stationary state
with the tonearm back in the arm rest.
Fig. 4-1 Mechanical parts name
* Start of Play
1. When the tonearm is moved across to the disc,
the PU plate located below in the arm base is
also moved.
2.Lever A is moved over by pin A connected to
this PU plate, resulting in lever B being un-
locked (Fig. -3).
3. At the same time that lever B is unlocked, the
microswitch is turned on (power on), and the
motor commences to rotate (Fig. -3).
PU plate
P i n B
Fig. 4-3 Start of play
* AUTO-RETURN DETECTION
l.When the stylus nears the center shaft, pin B
contacts plate A (Fig. A-q.
2. Plate A pushes plate C by an amount direcily
proportional to the amount of movement of
the tonearm (Fig. a-5).
3. Plate D atop plate C is moved toward gear B
by the movement of plate C.
Ei
G e a r A
Lever B
Lever A
P i n A
Fig.4-2 PU plate