Dual 522 - Additional Tone Arm Information; Removing Tonearm Housing; Adjusting Tone Arm Bearings; Cartridge and Anti-Skating Setup

Fig.
10
To
Remove the tonearm
or the spring
housing
1. Secure the unit
in a repair stand.
Turn the rotary turn
switch
60 to the zero
position. Lock the
tonearm 38. Remove the
counterweight 55.
2.
Turn the
unit
cover.
Remove the screening
sheet 160 and
solder off the
tonearm connections
at the muting
switch.
Turn the unit
the right way
up.
3.
Remove the fillister head
screw 61. Remove the
rotary turn
switch 60 and the
washer 59.
4.
Loosen the nut 56 and the
grub screw 57. Draw
the tone -
arm 38
complete with bearing 63
from the bearing race
58. The spring
housing 62 or the tonearm 37
may now be
changed.
Reassembly
involves the reverse
procedure.
To
Adjust
the Tone
Arm
Bearings
Exactly
balance
the tone
arm.
Both
bearings
should
have a
small,
just
perceptible
backlash
or
play.
Proper
adjustment
of the
hori-
zontal
bearing
is
achieved if
the tone
arm
can
freely slide
from
the
record
inside to
outside
while
the
anti-skating
adjustment is
0.5.
Proper
adjustment of
the vertical
bearing is
achieved
when
the
carefully
kicked tone
arm
swings into
balanced
position.
Adjust
the
backlash
by
grub screws
43
and 57
for the
horizontal and
vertical
bearing,
respectively.
Fitting a 1/2 inch
cartridge
If a
cartridge with 1/2
inch standard
mount is
to be
fitted, the
conversion kit Number
262 186
is
necessary.
The
proper
method
of
fitting is shown
in fig. .
Also the
decorative
cover
should be
removed from
the
counter-
weight 55 and
should be
fitted
with the
compensatory weight
to
be found in
the conversion
kit 41.
Coarse
adjustment
is carried
out by
moving the
weight
with stem
38
subsequent
fine
adjustment by
turning
the front
knurled
ring
on the
weight.
Anti-Skating
Device
To
adjust the
anti-skating
force,
operate the
pointer
scale
provided
on the
cover 69. Depending on
this
adjustment, the
skating lever
215 will be
deflected from the
tonearm pivot
point.
The
anti-
skating force is
transmitted
by the
tension
spring 212
to
the seg-
ment 200 and thus to
the tonearm 37.
The
factory
adjustment is optimal
for any stylus
having a
spherical
tip radius of
15 pm or elliptical
of 5
-6
and 18
-22
lim.
These factory-adjusted values
may be
varied
only in
an
authorized
Dual
service
workshop using a
Dual
Skate -0 -Meter and
a test
record.
Tone Arm
Lift
When you
move the lift control
bar 218 to the LIFT
position 1,
the tone arm will be
lifted and in
position LOWER
1
it
will be
lowered
through the lift
cam 219 and the
setting bar 204.
The
tone arm lift
has priority over
the set-down
mechanism. When the
record
player is started with the
control bar 218 in
the LIFT posi-
tion V
, the set-down
mechanism will move
the tonearm across
the record in
the auto mode.
Lowering of the tonearm
will take
place only after you
have adjusted the control
bar 218 to the
POWER
position 1.
The height of lift should
be 3 to 5 mm; it can be adjusted
by the
setscrew 26.
To Replace the Lift Plate 158
1. Remove the main lever 177 and the lock washer 242. Rotate
the
setscrew 26 until guide bearing 241 and setting bar 204 are
released. Remove lock washer 228 and setting bar 204.
2. Unlook the tension spring
212.
3. Remove lock washer 206 and
disk 205. Detach the shut-off
bar
179 from segment
200.
4. Remove hex. nuts 202
and the screw 202. Remove the segment
200 and the bearing 201.
5. Remove the screws 198 and the lift plate 199.
To reassemble, proced in reversed
order.
Fig. 11
204
242
241
179
206
s\L\
215
212
173 177 200 199
201 203 202
Tone
Arm Control
The tonearm
motions for auto lowering
and lifting are
controlled
by
cams under the cam
wheel 161 while the
wheel rotates through
360 °
Lifting
and lowering
motions are
controlled by the main
lever 177
and
lifting bolt
while the
horizontal motions of
the tonearm are
controlled by lever
177 with the
segment
200.
The
lifting/lowering mechanism is
active for 30
cm- and 17
cm-re-
cords,
it is coupled to
the turntable-speed
change-over
function.
The
tonearm
set-down points are
determined by
the spring pin
of
segment 200
abutting against
the setting bar
204. The
horizontal
motion is
limited by the
segment abutting
against the
setting bar
204 which is
lifted only
during the set-down
operation by
the
main
lever 177 and
thus comes
into the sluing
range of the
spring
pin
provided on the
segment.
5