Dual 1211 Service Manual

Fig. 7 Tonearm bearing assembly
The tonearm
and its suspension
Fig. 8
Tonearm bearing assembly
(under
view)
272
278
218
The tonearm of
the Dual 1211 is balanced by
springtension, held
vertically by needle bearings
and horizontally by ball bearings. The
tonearm
60
head is
removable. Before setting stylus pressure
according to the
cartridge used, the arm has to
be
balanced at zero. The
tonearm is lifted by
turning knurled screw (52)
counterclockwise (as
seen from the front), and
moved down by turning
it
clockwise. Cartridges between 1 to
8 grams can
be balanced,
piezo—electric (crystal) cartridges
haue
to be used on units with 2 pole motors. The
stylus pressure is
changed by turning the numbe—
red springhousing (58), wich increases or de—
creases the tension on
the enclosed spring.
Pressure
can be regulated from 0 to 5.5 grams
continuously, minimum pressure 3.0
grams.
Instructions to replace the complete
tonearm and bearing
assembly
1. Tighten set
in repair—jig, set pressure—dial
to zero and lock tonearm in rest.
2. Turn unit upside down and unsolder tonearm
leads.
3. Remove main—lever (218) and linking—lever
(272).
4.
Remove lock—washer (280) and skating—disc
(279), remove shut—off slide (278) from eccen—
tric bolt on segment.
5. Loosen cylinder—head screws (274/275) and
remove segment (276) with lifting bolt (250).
6.
Loosen lock—washer (177), turn unit right—side
up and pull the complete
tonearm with bearing
frame assembly
upwards out.
Installation of tonearm complete with bearing
frame assembly has to be done in reversed order.
The unit is in normal position. Check ball bea-
62
rings (14 steel—balls 2 mm diameter), insert
tonearm complete with bearing frame assembly and
58
lock in rest. With tonearm held in place, turn
set upside down, push lock washer (177) into the
notch at the shaft of the bearing frame assembly.
52
Put on segment (276). Before tightening screws
(274/275), check tonearm position on tonearm
59
rest,
which is correct, if tonearm sinks into
rest
without hesitation.
Replacement of tonearm
To remove the tonearm from the bearing frame,
the pressure dial has to be set of zero, after
unsoldering the tonearm leads. Unhook tension
spring (59). Remove locknut (47) with threaded
rod (46) and bearing screw (62) (left threaded),
remove tonearm carefully out of bearing frame.
6

Dual 1211 Specifications

General

Weight	6.5 kg
Speeds	33, 45 RPM
Platter	Aluminum
Wow and Flutter	<0.15%
Drive Type	Idler Wheel Drive