Dual 621 - Troubleshooting Common Defects

Defect
Cause
Remedy
-416,
Speed lies
at limit
of the range of adjust-
ment of
the pitch control
Stylus slides out of
playing groove
Nominal speed
is maladjusted.
Readjust nominal speed, described on page 7.
a)
Tonearm
is not a) Balance tonearm
balanced
b)
Tonearm
tracking
b) Adjust force to the value
stated by the cartridge manu-
force is too low
facturer
cl
Anti-skating setting c) Correct anti-skating setting
incorrect
d)
Stylus tip
worn or d) Renew stylus
chipped
e)
Excessive bearing e) Check
tonearm bearings and readjust if necessary
friction in tonearm
bearing
f) Steel ball
(162)
of f) Renew steel ball
shut-off bar
(161) m is-
sing
Tonearm
moves with
a)
Antiskating device
treck ing force and anti-
maladjusted
skating scale in 0-position
b)
Tight
tonearm leads
outwards or
inwards
cause
a torque
Tonearm does not set
down on record or lowers
too quick ly when
operating
the cue control lever (190)
Vertical tonearm move-
ment
shows resistance
Platter does not turn
after switching
unit on
and moving tonearm in
side
Tonearm does not set
down at the lead-in groove
of the record
Motor does not switch
off
when tonearm set
down on rest.
Acoustic feedback
a)
Readjust
anti-skating device
asdescribed on
page 9.
b)
Slacken leads
Excessive or
insuffidient Remove cue control plate (207). Remove shaft pin (200) and
damping as
a result of
washer
(201). Remove adjustment bush
sleeve (212). Remove
contamination of
the
washer (203). Remove lift pin (206) and compression spring
si licone oil
in the lift (205). Clean lift tube and lift pin. Smear lift pin evenly with
tube
"Wacker Silicon Oil AK 300 000". Reassemble components.
Excessive friction
of
Lift Pin (205) in
guide
tube
Power
supply to motor
interruppted.
Power
fuse (110)
defect
See obove, if necessary change the lift
pin (206)
Replace the fuse
(110)
Tonearm
set-down
point
The tonearm
set-down point can be adjust with the eccentric
is
incorrectly sei bolt
(176)
Suppressor
capacitor
in
power
switch ist faulty
(short circuit).
a)
Chassis
components
(e.g.
connecting leads)
rubbing on board
cut
out
b)
Connecting leads too
tight.
Replace suppressor capacitor in power switch
a) Line up mounting board cut-out according to installation
instructions
b) Slacken
or
lengthen
leads.
13