Dual 704 - Vertical Tonearm Control; Adjustment Points; Anti-skating Device; Adjustment

3.
Turn
unit into
head
position.
Remove
screening plate
(150).
Unsolder
tonearm
leads
an the
muting
switch
(149).
4. Remove
machine screw
(234), hex
nut (236)
and
fillister
head
screw
(67).
Also
remo-
ve
transition
plate
(233)
and
guard
plate
(235).
5.
Unscrew
machine
screw
(226) and
holding
spring
(224).
6. Hold
tonearm
(48) and
unscrew
pin
(220).
Unlock
tonearm (48)
and
remove it
care-
fully.
When
installing
the
tonearm
completely with
suspension,
proceed
in
reverse
order
consi-
dering the
following
points:
Place
pressure
spring
(39)
an
axle of
frame
(38).
Both
axles of
bearing
(58)
should
align
segment
(205)
accurately.
Frame
(38)
should not
contact
cover
(42)
after
tighte-
ning bolt
(220).
Mount
holding
spring so
that it
does
not
contact
the
setting
plate
when
moving
the
tonearm
(48)
(Fig.
16).
Replacmgspringhousing
Remove tonearm (48) from
bearing frame (51)
as described above. Loosen lock nut (56)
and threaded pin (57).
Unscrew bearing
screw (61). Lift bearing
frame (51. Remove
spring housing (59) and washer
(60
. When
installing note that the helical spring
catches the bearing
frame. Slide in washer
(60) and tighten bearing
screw (61). Rein -
stall tonearm (48). Set
bearing play as
described below using
threaded pin (57) and
lock nut (56).
Adjuging
the
tommnn bearing
First balance tonearm exactly. Roth
bearings
must
haue 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 re-
sistance.
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 (57).
Vertical
Tonearm
Control
After loosening the
tension lauer (63) the
tonearm can
be shifted vertically within
the range of about 8 mm
by turning knob (65).
When turning knob
(65) the pivot cam (217)
is moved thus
shifting the cue
control as-
sembly (201) and the tonearm
bearing (38)
vertically. This device is used to
maintain
the vertical tracking angle of the pick -up
cartridge independent from its height (dis-
tance between the mounting level of the
cartridge and stylus tip).
The vertical
tracking angle
is properly adjusted - with
the stylus tip on the
record - when the to-
nearm is exactly paralled to it.
To check for correct adjustment proceed as
follows:
Disconnect unit plug from power line. Cor-
rectly balance tonearm and adjust tracking
force. Put a 30 cm record
an
the platter.
Now, lauer the stylus an the run-out groove
using the cue control.
Check setting, cor-
rect if necessary. Tighten tension lever
(63) clockwise. Operate cue control (1)
and bring back tonearm manually an the rest.
Lower cue control
(I). Connect unit plug
to power line. For automatic adjustment of
the mechanical gear and
the shut-off mecha-
nism the unit should be started for the
first time with the tonearm locked.
Adjustment Point:
Knob (65) should not be moveable
when ten-
sion lever (62)
is tightened. Adjustment
can be made after loosening machine
screw
(216) and sliding or shifting adjustment
plate
(215).
Fig.
10
59
51
48
58
63
65
217
207
211 -
IIMBEfl
L I ST'
(27 -
38
-
52
205
224
226
220
Anti- skating
Device
To
compensate for skating
force use the
knurled
ring (68). The asymmetric cam plate
(231)
displaces the skating lever (228)
from
the tonearm
pivoting point. The
anti-skating
force is
transmitted to the segment
(205)
and to the
tonearm (48) by
tension spring
(223).
Optimum
adjustment is
carried out at the
works
for styli having a
tip radius of 15
µ
(conical),
5/6 and 18/22
µm
(elliptical),
and
CD
4-cartridges.
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 autho-
rized
service station.
11