Dual 704 - Tonearm Set-down Mechanism; Adjustment Points; Cue Control Operation; Cue Control Plate Replacement

Recheck
es follows:
Balance tonearm (48) correctly. Set
knurled
ring (68) to 0.
The tonearm should remain
at
any desired point
within its turning range.
The hole of
the skating lever
(228) should
be in alignment with the
center line of the
tonearm.
Adjustment is made by the
eccentric
pulley (E) which is
accessible through the
hole in the
installation plate (23)
between
the knurled ring (68) and the tonearm
moun-
ting plate (41) See Fig. 14.
The set knurled
ring (68) to "0.5". The
to-
nearm should now
smoothly rotate from the
platter center to its
rest (24).
Tonearm set
- down
mechanism
When turning
knob (69)
to "V"
position the
recesses of slide
bar (211) are
positioned
in the
area of the
spring pin (F)
of seg-
ment
(205).
When
moving slowly
the tonearm
with
tonearm
cue control
in •
position the
spring pin
(F) is
arrested in
the recesses
of slide
bar
(211)
thus
designing the
set-down point
of
stylus for 30 cm
and 17 cm
records.
To enable
set-down in the
catching
range of
the
arresting
point of the
appropriate
set-
down
position,
the
tonearm set-down
mechanism
can be disengaged"2.
Adjustment
Points:
a) Balance tonearm (48)
exactly. Bring knob
(69) into "V"
position. Let tonearm
catch in
catch point for tonearm set-
down point. Check catch force by means
of a spring
balance. lt should read 10 -
20 p. The force is adjustable by means
of a threaded
pin.
b) The tonearm set-down point can be adjust-
ed by turning set screw (26). Adjustment
can be made for 17 -cm- and 30 -cm records.
Any difference
between the 17 -cm and
30 -cm set-down point are to be compensat-
ed by eccentric pulley
(E) and segment
(205) (Fig. 16).
Cue
Control
By moving
the lever
(183) forward
(I) lift
cam (184)
rotates. The
slide bar (211)
con-
nected to it
transmits this movement
to the
lift
pin (201) (via
the
compensating cam
(207) which then
raises the tonearm.
As a
result, the cue
control
permits setdown of
the
tonearm at
any
desired point.
The lever
(183) is
released by
moving the
cue control
lever rearwards
(1). As a result
of the action
of
compression spring
(203)
the lift
pin (201) is
brought back to its
normal
position and the
tonearm lowered
slow-
ly.
Lowering of the
tonearm is damped by
si-
licone
oil in the
lift tube.
The
height of the
stylus above the
record
can
be varied by
turning the
adjustment bus
(202). The
distance should be
approximately
5 - 7 mm.
Fig.
11
Anti-skating
Fig. 12 Replacement of Cue Control Plate
214-
213-
212
-
207 or
206 - 1
-220
- 201
202
e
-236
235
234
67
233
Replacement of Cue Control Plate
Replace
cue control plate (201) as follows:
1
Fix unit on repair jig and lock tonearm.
Remove
weight (49).
2. Loosen
tension lever (63), bring tonearm
in its lowest position using knob (65).
3. Set knurled ring (68) of the
anti-skating
device to position "3". Turn
unit into
head position.
4. Remove machine screw (234), hex
nut (236)
and
fillister head screw (67).
Remove the
transition plate
(233) and guard plate
(225).
Remove safety washer
(241).
5. Remove
safety washer (214)
and washer
(213). Remove slide bar (211)
together
with bearing (212). Pull
off compensating
cam (207) and
compression spring (206).
6.
Unscrew pin (220).
Disengage cue control
plate (201)
from cam (217) and remove it.
For installation
proceed in the reverse
order.
12