Pioneer PL-100 Service Manual page 7

P i n B
Fig.4-4 Auto-return detection 1
Plate C
Fig.4-5 Auto-return detection 2
PL-1 Clcl
4. The front end of plate D moves approximately
0.1mm when the stylus is advanced 1mm
toward the center shaft by one revolution of
the record.
5. The tooth of gear B has the dimensional dif-
ference shown in Fig. 4-6.
6. Plate D is pushed back by this dimensional
difference at a stylus movement of within 1mm
per revolution of the record.
7. 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.
8. The end of plate D contacts the protruding
section of gear B (Fig. -7).
9. Gear B and gear A are engaged, and gear A is
turned by rotation of the turntable.
* A U T O - R E T U R N
1. Gear A and B are engaged each other by the
auto-return detector and gear A consequently
is turned in the counter-clockwise direction.
2.Plate B is then shifted across towards the tone-
arm due to the groove in the underneath of gear
A .
3. The edge of plate B pushes against lever C to
force the arm elevation upwards.
4. Plate B continues to shift across to push'against
pin B on the PU plate, thereby returning the
tonearm back to the arm rest.
5. At this stage plate B commences to return to-
ward the center shaft guided by the groove in
gear A.
Gear B
fGearA
Fig.4€ Auto-return 1
6. When the edge of plate B separates from lever
C, the arm elevation is lowered to drop the
tonearm back into the arm rest.
7. And at the same time that the tonearm is
returned to the arm rest, pin A returns lever A
back to the stationary state.
s
A
P l a t e D
(
f
i
,
Fig. 4-6 Auto-return detection 3
Fig.4-7 Auto-return detection 4