Dual 721 - Tonearm Does Not Set down at the Edge of the Record; Tonearm Does Not Set down or Lowers Onto Record too Quickly; Vertical Movement of Tonearm Dragging; Tonearm Returns to Rest Immediately

Defect
Tonearm does not set
down at the edge of
the record
Tonearm
does not set-
down
or sets-down
too
quickly after
operating cue con-
trol lauer
(201)
Vertical tonearm mo-
vement shows resi-
stance during set-
down
Tonearm returns to
rest after manual
set-down immediately
after the
platter
starts to turn
Tonearm
moves with
tracking force and
anti-skating scale
in 0 position
a)
outwards
b) inwards
During automatic
operation
tonearm
disturbing noises
are perceptible
No reproduction. The
short circuit of the
pick -up leads is no
longer being elimi-
nated
Motor does not shut-
off
when tonearm
sets down on rest
Acoustic feedback
Came
a)
Record size set-
ting incorrect
b) Tonearm
set-down
point is incor-
rectly set.
a) Set screw (40)
maladjusted.
b) Damping excessive
or too
low by
contamination of
the silicone oil
Excessive
friction
of
lift pin (213)
in
guide tube
Position of shut-
off has altered dur-
ing transport of
the
unit
a) Anti-skating de-
vice out of ad-
justment
b) Excessively tight
tonearm leads
produce a torque
Muting
switch out
of adjustment. The
distances between
the slide springs
and the
short cir-
cuit strips
on the
muting
switch are
excessive.
Distance between the
slide
springs and
the
short
circuit
strips on the
muting
switch is
absent or
insufficient
Suppression
capaci-
tor
(111) in power
switch is
defective
(short
circuit)
a)
Chassis compo-
nents (e.
g. also
connecting leads)
b)
Connecting leads
are too
tight
Remedy
a)
Gerry out necessary
adjustment with the
control
lauer (74).
b)
Set control
lever (74) to
"33". The ad-
justment screw
becomes visible
through
the hole between
the control lever (74)
and the
cue control. Turn
adjustment
screw either clockwise or
anti-clockwise.
a)
Adjust set screw
(40) for 3 - 5
mm cue
control
height.
b) Using turning
bush set for ( - 22i)
or ( - 2).
If necessary,
remove cue control plate
(210), as described on
page 14 and also
remove shaft pin (204) on
the lift pin
(213), washer (205),
adjustment sleeve,
the
second washer (205).
Remove lift pin.
Clean lift tube
and lift pin.
Smear lift
pin evenly with
"Wacker Silicone Oil
AK
300 000".
Reassemble
components.
See above (b)
After fitment
and auch time after transport
the unit should be
started once with tone -
arm
secured for automatic
adjustment of au-
tomatic
shut-off.
a)
Adjust skating
lever (see p.
13/14)
b) Slacken
tonearm leads
By bending the short circuit
strips. Adjust-
ment is correct
when, with the camwheel
in
neutral position, the
distance between the
slide
springs and the short
circuit strips
on
the muting
switch is approx. 0.3
mm.
Spray
contact springs with
preservative
(e. g. Kontakt 61)
and check adjustment
of
short circuit
strips.
By
adjusting the short
circuit strips.
Ad-
justment
is correct when,
with the camwheel
in neutral
position, the
distance between
the slide
springs and the
short-circuit
strips on the
muting switch is
approx.
0.3 mm.
Renew
suppression capacitor in
power switch
(10.000
pF/700 V)
a)
Line up cutout in accordance with data
in
fitting instructions.
Move leads.
b)
Slacken or
lengthen cable
18