Dual 522 - Motor and Drive; Speed Selection; Platter; Belt Replacement

tp.
Motor and Drive
Turntable
and mechanism are driven by the
motor 130. This
shaded-pole motor runs vibration-free in radially elastic mounts
and has extremely
low magnetic leakage.
The motor speed is independent of voltage,temperature,and load
variation. lt can only fluctuate with the mains frequency. Two
motor pulleys permitadaptation to the mains frequency of either
50 or 60 Hz; one pulley 116 is showin in both Fig. 2 and Fig. 3.
For
50 Hz use the pulley part no. 261
938,
for 60 Hz use the
pul ley part no. 261
939.
The driving force is transmitted to the turntable 14 by belt 17.
Speed Selection
To adjust
the
turntable speed to either 33
1/3
or 45
rpm, the belt
17
is shifted to the one
step of pulley 116
with the associated
diameter
(see Fig. 3). This is
achieved when you adjust
the speed
lever 20
so that the
START/STOP lever and the
spring lever will
move the change-over lever into
the desired (33 or 45 rpm)
Posi-
tion. When the record
player is turned
off,
, the
changeover
lever
is blocked
by the blocking bar
and the speed is just
preselected.
Only
when the
turntable 14
starts
running, the
blocking
bar 8
will release the
change-over lever. The
latter will then shift the
belt
17 to that step
of motor pulley
116 which
corresponds to
the desired
speed.
Platter
The platter is
secured to the securing disc 5 by the bayonet
catch. When removing the platter 14
press the securing disc
lightly downwards and turn it
approximately 60° to the right
until it is felt to dick out of
position.
Belt
To replace the belt 17,
first remove the turntable as above des-
cribed, then separate the belt from the turntable 14. Mount the
new belt on the
turntable.
NOTE: the ground (mat) surface of the belt should face the driven
part.
Install the
turntable and place the
belt 17 over the
motor
pulley 116.
To
Replace the
Motor
Pulley
1. Separate the belt 17
from pulley 116 and remove the turn-
table. Remove the toothed
belt 109.
2.
Disengage the tension spring 114 from
the shield 122.
3. Unscrew the hex. nut 111,
remove the setting cam 112,
belt pulley 113, and counter bearing 114.
4. Slacken the grub screws 117 and slide off the motor pulley
116. Slide the replacement pulley onto the
motor shaft.
Remove the taper sleeve. Pay
attention on the internal distan-
ce
spring. Position the motor pulley
116 at proper height
above the mounting plane, see Fig. 3.
Uniformly tighten the
grub screws 117. Put the'taper sleeve into the motor pulley
116.
5. Mount the counter bearing 114, the belt pulley 113 and
the
setting cam 112 and secure them
in place with hex. nut
111.
Install the tension spring 122 and the toothed belt
109.
Mount the turntable. Pull the belt 17 and place it around
the
motor pulley
116).
6. Turn the knob 18 to adjust the beit pulley to lts mid posi-
. tion. (The nose of the belt pulley 113 should point to the
motor pulley
center line.)
Adjust the hex. nut 111 to the
rated speed; the speed
increases when you turn the nut clock-
wise
and vice versa.
Fig. 2
1820
227,7ev
d r - i
• „
ma
Fig. 3
33%
U/min
45 U/min
Fig. 4
Strob
17
15,8mm
27
117
116
Strob
3