Dual CS 741Q Serviceanleitung Seite 14

Mechanical Part
General
The following itern 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 sel f-tapping screws (base set
§5) 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.
Removing the chassis complete
It is recommended to follow the following instructions when dismantling
the chassis complete:
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
Dismanting tonearm complete with tonearm bearings
It is recommended to follow the following order:
1) Set the control knob 129 in the zero position. Lock the tonearm
135. Loosen the tensioning screw 132 and remove the weight 166.
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.
4) Remove lock washer 155. Lift off main lever 154 and bearing sup-
port 153.
Remove the hex nut 110 and the sunk screw 113 and counter bearing
112. '
6) 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.
2
3
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5
=
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.
4) 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.
16
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 set 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.
Shortout
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 0.5mm.
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. 5mm.
Changing the lift board
1) 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 ecent ric 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 rail 150 through
the hole in cam whee! 30. :
Fuses
After removing the turntable 92 the cover of the fuse switch 27 can be
removed allowing access to the fuse 28.