Dual CS 731 Q - Safety Regulations and Troubleshooting; Safety Regulations; Troubleshooting Common Defects

Fig. 17
Fig. 18
Defect
Tonearm does not
set down or sets
down too quickly
after operating
cue control lever
(187).
Vertical tonearm
movement is in-
hibited
Platter does not
rotate after con-
nection of unit
and moving in of
tonearm
Tonearm does not
set down on the
edge of the record
Motor does not
switch off when
tonearm sets down
on rest.
Cause
Damping excessive
or too low by con-
tamination of the
silicone oil.
a) Lift pin (205)
jammed in guide
tube
Defective power
fuse (102)
Tonearm set down
point incorrectly
adjusted
Suppression са-
pacitor (110) in
power switch is defec-
tive (short-circuit).
Pull magnet “start/stop”
The stroke of the pull magnets can be altered with eccentric (Е 1).
The stroke should be set so that during “start” operation a play
of minimum 0.1 mm is present between the lap of the deflection
lever
(165)
and
the
start
slide
(39).
See
Fig.
11.
Pull magnet “lift”
The stroke of the pull magnets can be altered with eccentric
(E2). During operation of the pull magnet up to stop the lever
(187) should still just evidence perceptable play (min. 0.1 mm).
Safety regulations
Service
operations
on
electronic
units
may
only
be
carried
out
by
specialized
personnel.
The
unit
should
then
be
driven
by
an
isolating
transformer.
The
safety
regulations
in
accordance
with
VDE
0860
H
should
always
be
observed
during
repair.
In
addition,
construction
features
of
the
unit
should
not
be
altered
in
any
way
which
reduces
their
safety
e.g.
covers,
mecha-
nically
secured
leads,
creepage
and
error
distances
and
compo-
nents
must
correspond
to
the
original
spare
parts
list
and
be
cor-
rectly
fitted
again
(production
condition).
After
repair
it
must
be
ensured
that
all
conductive
components
which
can
be
touched
from
the
outside
do
not
carry
mains
voltage.
Remedy
Dismantle
cue
control
plate
(176).
Detach
control
stud
(175).
Remove
securing
disc
(178).
Unscrew
setting
sleeve
(177).
Remove
second
securing
disc.
Remove
lift
pin.
Clean
lift tube
and
lift pin.
Grease
lift pin
uniformly
with
“Wacker
silicone
oil AK
300
000".
Assemble
components
again.
See
above,
if
necessary
renew
cue
control
plate
(176).
Renew power fuse (102).
The tonearm set down point can be adjusted with eccentric pins
(172).
Renew
suppression
capacitor
in
power
switch.