Dual 622 - Tonearm and Suspension System; Tonearm Removal Procedures; Tonearm Bearing Adjustment; 1;2 Inch Cartridge Fitting

Fig. 8
34
52
50
51
57
44
35
208
Fig. 9
Fig. 10
-
•
•
--
r• J I
33
32
58
54
55
61
63
173
174
170
To Remove
the tonearm or
the spring
housing
1.
Secure the unit in a repair
stand. Turn the rotary turn
switch
51 to
the zero position. Lock
the tonearm 48. Remove the
counterweight
49.
2. Turn the unit
over. Remove the
screening sheet 140
and
solder off
the tonearm
connections at the short
circuiter 137.
Turn the
unit the right
way up.
3.
Remove the fillister
head screw 55.
Remove the rotary
turn
switch 54
and the washer
53.
4. Loosen
the nut 50 and
the grub screw
51. Draw the
tone -
arm 48
complete with bearing
57 from the
bearing race 52.
The spring housing
52 or the tonearm
48 may now be
changed.
Reassembly involves the
reverse
procedure.
Removal of tonearm assembly with tonearm
bearing
We
recommend the following procedure:
1. Clamp unit
in the repair jig. Set the
rotary knob 54 to zero.
Lock tonearm 48. Remove
weight 49.
2. Move unit
into head position and remove
the screening plate
140. Unsolder the tonearm
connections on the muting switch
137.
3. Remove
lock washer 184. Lift off main lever 183 and bearing
support 182.
Remove lock washer 144. Lift off setting
raie
141 and rotary bearing 143 and turn towards motor 149.
4. Unlock tension spring 209. Loosen lock washer 212 and
remove
skating lever 211.
5. Remove lock washer 211 and slide bar 171. Lift off shut-off
bar 161 from segment 208
6. Remove hex nut 170. Remove sink screw 174. Hold tonearm
48 and lift off counter bearing 173 and segment 208.
7. Remove tonearm complete with
tonearm bearing.
Reverse
this procedure when reassembling. Please
bear in
mind
the
threaded pin 33 is correctly positioned in
the bell bearing.
Adjusting the tonearm bearing
First
balance tonearm
exactly. Both bearings
must have slight,
just
perceptible play.
The horizontal
tonearm bearing
is correctly
adjusted
when at anti-skating
settings "0.5" and
being touched it
slides
in without
resistance. The
vertical tonearm bearing
is
correctly
adjusted when it
swings in after
being touched. The
play of the
horizontal tonearm
bearing should
be adjusted with
threaded pin
33 and mat of
the vertical tonearm
bearing with
threaded pin 51.
Fitting a 1/2 inch cartridge
lt
a
cartridge
with 1/2
inch standard mount is
to be
fitted, the
conversion kit 31 Number 262 186
is
necessary. The proper me-
thod of fitting is shown in fig. 8.
Also the decorative
cover should be
removed from the
counter-
weight
49 and should be
fitted with the
compensatory weight to
be found
in the conversion kit 31.
Any
alteration can only be carried
out with
the aid of
a Dual
-
Skate -0 -Meter and a test record and
should only be done by an
authorized service station.
Anti-skating Device
To compensate for skating force use
the knurled ring 68. The
asymmetric cern plate displaces the skating lever 216 from the
tonearm pivoting point. The anti-skating force is transmitted to
the segment 207 and to the
tonearm 48 by tension spring 208.
Optimum adjustment is carried out at the works for styli having
a tip
radius of 15µm (conical), 5/6 and 18/22 /Im
(elliptical).
Any alteration can only be carried out with the aid of a Dual -
Skate -O
-Meter and a test record and should only be done by an
authorized service Station.
6