PERPETUUM EBNER PE 2020 - Adjusting Instructions; General Adjustments and Antiskating Setup

6
Item
No
9
21
Description
Pick-up arm
counterweight
Pick-up
arm
tracking
weight
adjustment
knob
46
Slide
carrier
assembly
56
Setting knob
for
antiskating
precision
control
assembly
D
Zero-adjustment
HH
Eccentric,
tracking
weight
Pick-up
arm
The
pick-up
arm
is
balanced
by
means
of
the
counterweight
by
radial
movement
of
the
latter
on
the
tail
end
of
the
pick-up
arm. The
pick-up
with
the
slide
carrier
must be
incorporated
for
this
adjust
ment.
For
protecting
the
pick-up
arm
bearing
against
shocks
and
for absorbing
vibrations,
the
counter
weight
is
elastically
mounted
to
the
pick-up
arm
tube. The
tracking
behaviour
of
the
pick-up
arm
and thus
the
most
important
quality
characteristic
of
the
pick-up
arm is
determined
by
its
bearings.
To
assure
the minimum
possible
friction
for
the
horizontal
movement
of
the
pick-up
arm,
we
have,
therefore,
used
a
superfine
twin
ball-bearing,
the
brasses
of
which have
an
extra-fine
finish.
The
bearing
permitting
the
vertical
movement
of
the
pick-up
arm
also
consists
of
two
superfine
ball-
bearings
with
a
specially treated
surface.
The
very
small
frictional
forces of
the
pick-up
arm
are
of
extreme
importance
for
the
antiskating
device.
Dependability
features
If
the
horizontal
movement
of
the pick-up
arm
(10)
is
interfered
with
or
if
the
unit
is
started
while
the
pick-up
arm
(10)
is still
locked,
this
cannot
affect
the operation
of the
unit
because
the pick-up
arm
(10)
is
connected
to
the
operating
mechanism
for
the
horizontal
movements
by
means
of
a slipping
clutch (184). The
pick-up
arm
lifting
elements
are
resilient
to
permit
the
lifted pick-up
arm
(10)
to be
pressed down
without
allowing
any
permanent
deformation
to
interfere
with
the
proper
operation
of
the
unit.
When
the
unit
is
started
without
a record
on
the
turntable,
the
pick-up
arm
(10)
remains
on
its
rest.
The
feeler pin
(34)
and
the
sensing
lever
(154)
remain
unaffected
by
a
recording
during
the
sens
ing operation.
Since
the
feeler pin
maintains
its
position,
the
lower
locating
lever (151)
is not
repelled
so
that
the
pick-up
arm
is
prevented
from
moving
in
on
the
record.
Chassis
plate
The
chassis
plate
is
a
laminated
board.
A 032”
(08
mm)
thick aluminium
sheet
is
pressed
upon the
.06” (1.5
mm)
steel
plate,
using
a
heat-sensitive
adhesive
at
a
high
temperature.
This
ensures
a
high degree
of
rigidity
and
minimizes
resonance
N
21
HH
0