Dual 521 Service Manual

Defect
Tone arm
improperly lowered
(too fast or not on
record).
Acoustic
Feedback
Rated speed borders pitch
adjustment range.
Replacement parts
Cause
Shock-absorbing action of
sil icone
oh l in
lift
tube
is ex-
cessive or
insufficient.
a)
Chassis parts
(e.g.
connecting
leads)
hit bench
cutout.
b)
Connecting
leads are
strained.
Positioning of
belt pulley
(1) is
inaccurate.
Pos.
Part.-No.
Oty.
Description
1
214 054
1 Washer
4 220 213
1
Centering piece
6
244 460
1
Turntable I ining
7 246
738 1
Turntable
cpl.
8 234
428 1
Carrier cpl.
9
210 472 2
Fillister head screw
M 3 x 4
10 210 586
1 Washer
3.2
11 232
086 1
Retaining
spring
12 234 430 1
Locking
rail cpl.
13 232 087
1
Retaining spring
14
210 194
1
Grip ring
15 246 084 1
Flat belt
16
234 912 1
Control
knob
17 232
078 1
Bearing bush
18
234 910
1 Speed
lever
19 237 222 1
Speed
cover
20 213
260 3
Grooved drive
stud
21
237 414 3
Transport
lock
22
246 740 1
Built-in plate cpl.
23 237
226 2
Spring suspension
cpl. (motor side)
237 227 1
Spring
suspension cpl. (pick
-up arm
side front)
237 228
1
Spring suspension
cpl. (pick -up
arm
side rear)
24
230 529 4
Threaded
coupling
25 236 710 2
Pressure spring
(motor side)
236 711 1
Pressure
spring (pick -up
arm side front)
236 712 1
Pressure spring
(pick -up arm
side rear)
26
200 723 4
Rubber absorber
27
200 722
4 Pot
30 246 741 1
Pick up head cpl.
31 237 223 1
Contact plate cpl.
32
236 242
1 Fixture
TK
24
38 210 472
1 Fillister head screw
39 234 599
1 Reset cam
Repair
Demount the lift
plate (15) , remove
the control stud
(154), lock
washer (155), and setting sleeve
(156)
with
lock washer; remove
lift bolt
and pressure spring, clean lift tube
and lift
bolt. Evenly
apply WACKER
SILICONE 'Oft AK 500 000 to the lift bolt.
Reassemble the
parts.
al Al ign cutout by installation instructions.
b) Loosen or extend the cables.
Adjust knob (16) to mid position; adjust hex. nut
(110) to rated
speed
(clockwise adjustment will increase the speed and
vice versal .
Safety regulations
Servicing of electronic
equipment
should be performed
only by
authorized service personnel.
During service
the unit has to be
operated with an
isolated trans-
former.
Safety
requirements (e. g. VDE
0860 H) haveto be
strictly observed
during repair.
In
order to
not reduce safety,
the original design
of the unit should
not be
changed, e. g. cover
plates, mechanically
secured wiring,
tracking and creepage distance in air etc.
Use only
factory replacement
parts which must be
reinstalled per
original design.
Upon completion of
repair make shure that
all accessible and
conductive parts do not carry
line voltage.
Pos. Part.-No. Oty.
Description
40
240 069 1 Adjusting
screw
41 210 643
1 Washer
4.2/12/1
42 210
366 1 Hex nut
43 234 635 2 Counter nut
44 230 063 1 Grub screw
45 240 962
1 Frame cpl.
46 234 634
1 Grub screw
47 234 635 2
Counter nut
48 244 785 1 Switch
lever
49 246 744 1 Support cpl.
50 246 743 1 Pick up arm cpl.
51 240 964 1 Weight
52 210 147 1 Locking washer
4
53 238 666 1 Mandril
54 233 744 1 Stay
55 242 098 1 Bearing frame
56 236 160 2 Support plate
57 239 565 2 Fillister head screw
M 2.5 x 3
58
241 447 1 Clamping screw
59 238 201 1 Thread
plate
60 238
202 2 Locking screw
61 237
672 1 Groove drive stud
1.4 x
6
62 238 623 1
Pointer
63 242 099 1 Bearing cpl.
64
-2-343 - 5te- 1 Spring casing cp1.226 Q6 ) 7
65 237 563 1 Washer
66 237 564
1 Bearing screw
67 246 746 1
Rear cover
68 200 444
6 Spring washer
69 240 151 1 Rotary knob
70
246 747 1
Front cover
100 210 146 3 Locking washer 3.2
101 232
096 1 Svvitch lever
102 232 071 1
Clip spring
103 232 094 1
Connection part
104 232 079 1
Shouldered nut
10

Dual 521 Specifications

General

Drive System	Belt drive
Speeds	33 1/3 and 45 RPM
Weight	5.5 kg
Anti-Skate	Yes
Stylus	Elliptical
Output	Depends on cartridge