Dual CS 741Q Service Manual

Mechanical Part
General
The
following item numbers refer to the spare part lists and
exploded
drawings.
The cover can simply be removed by the hinged clips.
Base
The base 57 is secured by four
cheesehead self-tapping screws (base set
55) and with two screws 20
on the spring cluster.
Front screen
The
front screen 63 is secured to the casing 95
by two hexagonal nuts
120.
Special attention must be paid to ensure that the
coil spring fits in the
recess of the bearing 134.
Reassemble the tonearm. Adjust the
bearing
play as described below.
Adjustment of tonearm bearings
The
tonearm
must be exactly balanced. Both
bearings should
have very
little or no play. The horizontal tonearm
bearing
is correctly adjusted
when the tonearm can
freely slide in and out with the antiskating adjust-
ment sei to "0.5" The vertical tonearm bearing is correctly adjusted
when the tonearm freely swings
back into position after being tapped.
The play in the horizontal tonearm bearing can be adjusted with the
setscrew
99 and the
counter nut 98. The play in
the vertical tonearm
bearing can be adjusted with the setscrew 118 and the counter nut 119.
Removing the chassis complete
lt
isrecommended to follow the following
instructions
when dismantling
the chassis
complete:
Shortout
1) Remove cover 95
and
turntable 92.
Remove the
base 57.
2) Loosen the three
cheesehead screws 93. Lift cover 94 and turn so
that it can be removed over the tonearm bearing and tonearm.
3) Swing in
tonearm 135
and solder
connecting
leads. Hold chassis.
4) Remove the four cheesehead screws 19 of the spring cluster 17 and
remove
chassis from the casing 95.
Tonearm and
tonearm bearings
xs
Dismanting tonearm
complete with
tonearm
bearings
>31
]C
--9
901
NI
-•
lt is
recommended to follow
the following
order:
11 Set the
control
knob 129 in
the zero
position. Lock
the tonearm
135.
Loosen the tensioning screw
132 and
remove the
weight
166.
2)
Remove the
cheesehead screw
84, the hex nut
83 and cover
plate 82.
Unsolder the tonearm leads
at the shortout 77.
Remove
the machine
screw 181, the
micro switch and
the switch
support 176.
41
Remove lock
washer 155. Lift off main
lever 154 and
bearing sup-
port 153.
5) Remove the hex
nut 110 and the sunk
screw 113 and counter
bearing
112.
61
Hold tonearm.
Remove the
machine screw
73 and
lift Tonearm cpl.
Reverse this
procedure when
reassebling. Please
bear in
mind the threshold
pins is correctly positioned in the ball
bearings.
Removing the tonearm from the bearing case
1) Remove weight 166.
Screw out tensioning screw 132
and set the
control knob 129 in the zero
position.
2)
Remove cheesehead screw
84 and cover plate 82.
Unsolder the tone -
arm leads at the shortout 77.
3)
Loosen the countersunk screw
130. Remove control
knob 129
washer 128 and
pointer 127.
41
Loosen lock nut 98 and remove setscrew 99.
5) Remove tonearm 135.
Assembly should be carried out
in the reverse order.
Changing the spring casing
Remove
the tonearm 135 from
its bearings 126
following the instructions
described above. Remove the
spring case 133.
Adjustment point
When the
curve wheel is in the zero
position the contact distance
between the contact spring F and
shortout contact L should be
0.5 mm.
If necessary,
bend shortout contact slightly and
clean the contact spring
with a suitable cleaning agent.
Tonearm lift
Adjustment point
The
tonearm lift height can
be adjusted by
means of the adjustment
screw
and should be
between
ca. 5 mm.
Changing the
lift board
11
Lock tonearm 135 in position. Remove
the screw 181, the
micro-
switch 34 and the switch
support 176. Remove the
lock washer 155.
Lift off main lever 154 with bearing
support 153.
2) Remove
the lock washer 180 and the cam
wheel 179.
Loosen
the
machine
screw 108.
Remove the
slide bush
171,
lift the
adjusting
bar 170
and remove the lift board
105.
Assembly is carried
out in the reverse
order.
Adjustment points
Set down point
The set
down point of
the tonearm can
be altered
with the ecentric
bolt
E
(Adjusting
plate
71). The
setting is effective not only
for 17
cm but
also for 30 cm
records.
Shut-off point
The shut-off
point can be
varied within the
shut-off range
(record dia.
116 to
122
mm).
Remove platter
92. Using a
screwdriver
adjust shut-off
rau
l
150 through
the
hole in cam wheel
30.
Fuses
After
removing the
turntable 92
the cover of the
fuse switch 27
can be
removed allowing access to the fuse
28.
16

Dual CS 741Q Specifications

General

Brand	Dual
Model	CS 741Q
Category	Turntable
Language	English