Dual CS 626 Service Manual

Tonearm and
Tonearm
Suspension
The feather-light, extremely torsion
resistant all-metal tonearm is
suspended in a gimbal. Suspension is by
means of 4 hardened
and
precision polished steel points
which rest in precision ball
bearings.
Tonearm bearing friction is thus
reduced to a minimum.
Bearing
friction vertical 0.07 mN (0.007 p)
Bearing
friction horizontal
0.15 mN
(0.015
P)
as
related to stylus
point.
As a result, it
ensures most favourable pick
-up conditions. Before
adjusting the tracking
force to suit the
built-in pick -up
cartridge
the
tonearm is balanced
with the scale set to
zero. Coarse adjust-
ment
is
carried out by moving the
weight with the stem
40, the
subsequent
fine adjustment
by turning the
weight.
The
tracking force is adjusted by
turning the graduated
rotary
knob
64 incorporating a coil
spring. The scale has
markings for
a
range of
adjustment from
0 to 30 mN
(0 to 3
p) which permit
accurate
adjustment of the
tracking force. One graduation
in the
range of 2 - 15
mN (0.2 - 1.5
p) corresponds to
1 mN (0.1 p)
in the range
of
15 - 30 mN
(1.5 -3 p) to 2.5 mN
(0.25 p).
To remove the
tonearm or the
spring housing
1. Secure
the unit in a
repair
stand. Turn the
rotary
turn switch
64 to
the zero position. Lock
the
tonearm
73.
Remove the
counterweight 40.
2. Turn
the unit
over. Remove
the
screening sheet
217 and
solder
off the
tonearm
connections at the
short
circuiter 211.
Turn the unit the
right way up.
3.
Remove
the fillister
head screw
66. Remove
the rotary
turn
switch 64
and the washer 65.
4.
Loosen the
nut 44 and the
grub screw 45.
Draw the
tonearm
73
complete
with bearing 70
from the
bearing race 46.
The
spring
housing 69 or
the tonearm
73 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 64 to zero.
Lock tonearm 73. Remove weight 46.
2. Move unit into head position
and
remove the screening plate
217. Unsolder the tonearm connections
on the muting switch
211.
3.
Remove lock washer 179. Lift off main lever 178 and
bearing
support
177. Remove lock washer 191. Lift
off setting raie
191 and rotary bearing 189 and
turn towards motor 141.
4. Unlock tension spring 187. Loosen lock
washer 184 and re-
move
skating lever 183.
5. Remove lock washer 173 and slide
bar 172. Lift off shut-off
bar 171 from
segment 185.
6.
Remove hex nut
168. Remove
sink screw 170. Hold
tonearm
73 and lift off counter bearing 169 and segment 188.
7. Remove tonearm complete with tonearm bearing.
Reverse
this procedure when
reassembling. Please bear in mind
the threaded pin 42 is correctly positioned in the ball bearing.
Fig. 10
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 42 and
that of the
vertical tonearm
bearing with
threaded
pin
45.
7

Dual CS 626 Specifications

General

Brand	Dual
Model	CS 626
Category	Turntable
Language	English