Mechanism Operation And Adjustment; Start Of Performance; Auto-Returndetection - Pioneer PL-516 KCT Service Manual

5 . M E C H A N I S M O P E R A T I O N A N D A D J U S T M E N T
5 . 1 S T A R T O F P E R F O R M A N C E
1. The tonearm is moved from the arm resr ro
above the turntable.
2. Lever A, connected to the tonearm, unlocks
lever B, and the microswitch is turned ON
( F i g . 1 ) .
3. When the microswitch is turned ON, the motor
is started and the turntable begins to rotate.
5 . 2 A U T O . R E T U R N D E T E C T I O N
1. When the stylus nears the center shaft, Iever A
contacts lever C (Fig. 2).
s
Plate B atop plate A is moved toward gear A
by the movement of plate A.
The front end of plate B moves approximately
0.1mm when the stylus is advanced 1mm
toward the center shaft by one revolution of
the record.
The tooth of gear A has the dimensional dif-
ference shown in Fig. 4-a.
Plate B is pushed back by this dimensional dif-
ference at a stylus movement of within 1mm
per revolution of the record.
When the stylus enters the lead-out groove in
the record at the end of the performance, it
is moved 4mm toward the center shaft by one
revolution of the record.
The end of plate B contacts the tooth of gear
A (Fig. a-b).
Gear A and gear B are engaged, and gear B is
turned by rotation of the turntable.
3 .
4 .
5 .
r).
7 .
8 .
9 .
L e v e r A
t - )
| --1 (-
2 .
Lever C pushes plate
proportional to the
the tonearm (Fig. 3).
F i g . 2
A by an amount directly
amount of movement of
a
F i g . 1
F i g . 4 - b