Dual 721 - Assembly I Nstructions for Dual EDS 1000-2; Stroboscope

Assembly
lnstructions for Dual
EDS 1000-2
For
repair
of
the Dual
EDS
1000-2
special
tools
and
measuring
means are
required.
Work
on
the
motor or
motor
electronic
Sy-
stem
should,
therefore,
only be
carried
out
by an
authorized
Dual
service
station.
Ex-
penses
arising
from
unauthorized
interferen-
ce
will be
charged to
the
consignor.
Removal
Lift off platter (4). Remove
housing of p0 -
wer pack (123) after removing screws (117).
Fig. 8
125)--
6
Attention! Unsolder leads for operating vol-
tage on power board (125).
Do not remove
cable on motor side.
Unsolder connections on rotary
knob (192)
and potentiometer (191/R
33). Pull off in-
sulating tube.
Unscrew complete
bearing pillar (147) and
remove together
with washer (148). Remove
cam wheel (144). Be careful with ball (136)
in stop bar (164). Remove intermediate pla-
te
(137).
Undo hex nuts (75) and the three machine
screws. Lift motor (5) and make sure that
the connecting leads and the
thermistor are
routed in the chassis
recessed. Remove the
motor. Slide the
insulating tube over the
connecting leads. Place motor in original
carton for return shipment.
Installation
Remove motor
from packing, pull off insulat-
ing tube. When inserting the motor on the
mounting board (21) ensure that the lead
outlet
hole faces the power pack (123).
Now, refit motor and other disassembled
parts in reverse order to that
described
under "Removal".
Attention: To prevent deformation of the
shorting springs the camwheel (144) should
not be fitted in 0 position. Make sure that
the pin of main
lever (154) is engaged in
the guideway of the camwheel (144).
After assembly fit knob (44) complete with
pin in midposition. Switch on unit and check
current
consumption on operation.
220 8/50 Hz approx. 18 mA
117 V/60
Hz approx. 35
mA
Using
control (R 21) set nominal speed
45 rpm (check by means of a
strobe disk),
using control (R 22) set nominal speed
33 1/3 rpm. Run in for approximately 5 mi-
nutes and,
if necessary, correct speed.
Note:
lt
is advisable subsequently to
carry
out a brief check of all unit functions.
Stroboscope
Accurate
setting of the platter speeds
33 1/3 and 45 rpm can be
checked during
play with the aid
of the stroboscope.
When the platter (3)
is rotating at
exactly
33 1 / 3
or 45 rpm the lines of
the strobos-
cope appear to stand still. If
the lines
move in the direction of
rotation of the
platter, the platter
speed is too high. If
the lines move
backwards, the platter
is
rotating more
slowly than the nominal speed.
Adjustment of platter speeds 33 1/3
and
45 rpm is carried out
separately with the
"pitch"
knobs (44).
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