Dual 1229 Q - Tonearm and Bearing Assembly; Tonearm Balancing and Stylus Force Setting; Tonearm Bearing Replacement Steps

Tonearm
and Tonearm Bearing
Fig.
9 Tonearm
bearing assembly
•
Tubular
tonearm, extra lightweight,
torsionally
rigid
tonearm of the Dual 1229 Q
pivots both
horizontally and vertically on needle bea—
rings and precision ball bearings in harde—
ned and
polished races. lt is suspended in
a gimbal
arrangement. This keeps friction
to a minimum.
Vertical
pivot friction = 0.007 gram
Horizontal pivot
friction = 0.015 gram
referred to stylus
tip
The
arm is thus able to track extremely well.
The
tonearm head is removable. Before
set—
ting
the tracking force
for the cartridge
being
used, set the
tracking—force scale to
zero
and balance the
tonearm. Initial ba—
lance
is by sliding the
counterweight (74).
Final
adjustment is by turning the weight.
You can balance
cartridges with a weight of
1 to 10
grams.
To reduce the
effects of small shock im—
pulses on the arm, the
counterbalance weight
is resiliently mounted on a threaded spindle,
and
friction—braked to prevent accidental
rotation. The
cartridge holder will accept
all
cartridges with
international standard
mounting centers of
1/2 inch. Stylus force
is set by turning
a calibrated housing (78),
which
stresses or releases a spiral spring
contained
inside. The scale adjustment
is
calibrated
from 0 — 3
p, from 0 —
1.5 p at
1/10 p and from
1.5 — 3 p at 1/4 p
intervals.
Tracking forces of mors than 3 p
can be ad—
justed with the help
of the counter—weight
on the
tonearm; turning left
(counter—clock—
wise)
increases the
tracking force by 1/2 p
per
complete
turn.
To replace the
tonearm and bearing assembly,
follow
these steps:
1. Set stylus force dial
to zero and mo—
de selector
to "single".
2. Fasten unit in
repair jig and turn
upside
down.
3.
Unsolder tonearm
bade.
4. Remove main lever (184) and linking
layer
(270).
5. Unhook springe
(237, 241, 269 and
unscrew protective plate
(233 .
6. Remove washer
(266) and skating lever
(267).
7. After removing lock wacher
(272) and
sliding disc (271),
remove shut—off
slide
(253) from segment
(201).
8.
Loosen hex nut (236). Pull
off guide
(198) and
lock wacher
(199).
After
unscrewing
positioning sleeve
(200),
lift plata with lifting
pin (203) and
segment
(201) can be removed.
9. Turn the
unit back in its normal po—
sition.
10. Set
mode selector on "multi", then
rotate the tonearm bearing frame (58)
counter—clockwise until it cannot turn
anymore. The tonearm can then be lif—
ted out.
61 62 58 60 59
Fig. 10
Tonearm
assembly
sequence
78
83
76
57
68
10
201
203
206
7