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Mechanical
Part
General
The
following
item
numbers refer to the spare
part
lists and
exploded
drawings.
Base
The base
74
is
secured
by
six
cheesehead self-tapping
screws
(base
set
75) and with four screws
72 on
the
stay
rail.
Front
screen
The
front
screen 54
is
secured
to
the
casing 85
by three hexagonal nuts
49.
Motor
and drive
Special
tools
and
measuring equipment
are
necessary
when repairing
Dual
EDS 50'l . Therefore
repairs
to motor and
motor circultry should
be carried
out
by an authorized
Dual service
agency.
Changing
the motor mechanism
1.
Unscrewthetwo
setscrews64
and
removethecone 65
and washer66.
2.
Disconnect
the motor and
generator power connection
from the
rn
otor
ci rcui
t
ry.
3.
Remove the three
cheesehead
screws 61.
Replace
the motor
me-
chanism 67.
Setting the rated
speeds
Dual CS 6O7
1.
Set the control
ipitch)
R
9015
to the mid
position.
2.
Activate
the
relevant speed
control
switch.
Set the control situated
in the motor
circuitry
R
9009
rated speed
33 rpm
R
901 1
rated speed
45 rpm
3.
Test the rated speed
with the
built in stroboscope.
Adlusting
the rated
speed Dual CS 617 O
Adjustment should be carried
out in the
following
order:
1.
Set the crystal/pitch switch
in the crystal
position,
2. Set speed control switchover
in
position
33.
3.
Connect
point
1 4a of the motor circuitry to
earth.
4. Adjust the rated
speed 33
rpm with the aid of
the
built-in strobos-
cope
on
control
R 9028.
5. Set the speed control switch
to
position
45.
6.
Adjust
the rated speed
45 rpm with the built in stroboscope
on
control
R
9024.
Pitch contro I variation
Each rated
speed
can be varied within a
rangeof
15.5%with
the
"pitch'
control.
Dual CS
617 Q
When the crystal/pitch switch is
in the crystal
position
the turntable
speed
corresponds
exactly
to
the adjusted
rated
speed.
This is carried
out independently of the
position
of the control.
Tonearm and
tonearm
bearings
Dismanting
tonearm complete
with
tonearm
bearings
It is recommended
tQ follow
the following
order:
1. Set the
control
knob 139
in the zero
position.
Lock the tonearm
152.
Loosen
the tensioning
screw 149 and
remove the weight 130.
2.
Remove the
screening
sheet
41. Unsolder
the tonearm connections
on the muting switch
39.
3.
Remove safety washer 172,
washer 171
and bearing 17O.
Move
positioning
bar 169
towards muting switch
39.
4.
Unlock
tension
spring 124,
loosen safety
washer 125 and
remove
skating
lever
123.
5. Remove safety washer 114
and sliding
washer
113 and
take shut
off
bar
112
froln
segment.
6.
Slacken
hex nuts
109
and the screw 111.
Remove the bearing 110
and segment
1O8.
7 Hold tonearm 152. Remove the machine screw
137 and tonearm
cpl-
with tonearm bearing.
Reverse this
procedure
when
reassebling. Please bear in mind the threshold
pins
is correctly
positioned
in the ball bearings.
Removing the tonearm from
the bearing
case
i.
Remove welght 130.
Screw
out tensioning
screw
149 and set
the
control
knob
139
in the
zero
position.
2. Remove
the cover
plate
41.
Unsolder
the tonearm leads at
the short-
out
39.
3.
Loosen the countersunk
screw
138.
Remove the control
knob 139
and
the sasher 140.
4.
Loosen lock nut 134 and
remove setscrew
135.
5. Remove
tonearm 152.
Assembly
should be
carried out in
the reverse
order-
Changing
the spring
casing
Remove
the tonearm
152{.rom
its bearlngs
141
f ollowing the
instructions
described above.
Remove
the spring
case 150.
Special attention
must bre
pald
to
ensure
that
the coil
spring
fltsin
the
recess
of the
bearinq 151.
Reassemble
the tonearm.
Adiust the bearing
play
as
described
below.
Adjustment
of
tonearm
bearings
The tonearm
must
be exactly
balanced.
Both bearings
should
have very
little
or no
play.
The horizontal
tonearm
bearing
is correctly adjusted
when the tonearm
can
freely slide
in and outwith
the antiskating
adjust-
ment set
to
"0.5".
The vertical
tonearm bearing
is correctly
adjusted
when the tonearm freely
swings
back into
positlon
after being
tapped.
The
play
in
the horizontal
tonearm bearing
can be adjusted
with the
setscrew 133
and the
counter nut 132.
The
play
in
the vertical
tonearm
bearing
can be
adjusted
with the setscrew 135
and
the counter
nut
134.
Tonearm
lift
Changing the
lift board
The
following
instructions
should
be
followed
when
changing the
lift
board
complete 1O1.
1.
Lock
tonearm
152 in
position. Remove lock
washer 172 and
washer
171
as well as
bearing 170.
Llft the cueing
rail
169
and swing
it over
to shortout
39.
2. Femove the
two cheeshead screws 103.
Remove
lift board
101.
Assembly is carried
out
in
the reverse
order.
Adjustment
points
Shortout
When the
cu rve wheel
is in the zero
posit
ion the
contact d ista
nce between
the contact spring
F and shortout
contact
L should be 0.5
mm,
lf
ne-
cessary,
bend shortout
contact slightly and
clean the
contact
spring
with
a
suitable cleaning agent.
Segment
Special attention
should
be
paid
when securing segment
108
to
ensure
that
play
of 0.5
mm
exists
between
the
segment
and the switch
lever 68.
Setdown
point
The setdown
point
in
the setdown
range
(records
@
tt0 to
122
mm)
can be adjusted
by the eccentric
cam E situated
on
the segment
108
Power switch
Swing in
the tonearm.
The
slide
in the
power
swltch
156 should
have
a
play
of 0.2
-
0.5
mm"
Adjustment
should
be carried
out by bending
the
switch
lever 68.
Fuses
CS 607
After removal
of both
attachment
screws
and
removal of
power
section
cover the fuse
13
on
the
power
plate
12
can be
replaced.
Fuses CS
617 Q
After removing
the turntable
82
the cover of the fuse
switch
8 can be
removed allowing access to
the f use
9.
e
13
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