Dual 606 User manual

Service
Manual
Technical Data
Current
Line voltage
Drive
Power
input
Power consumption
Time from
start to rated speed
Platter
Platter speed
Pitch control
Speed control
(monitoring)
Sensitivity of the illuminated
strobe
(for 0.1 % speed deviation)
Total wow and flutter
(according to DIN
45507)
Rumble
(according to
DIN 45500)
Tonearm
Effective length
of tonearm
Offset angle
Tangential tracking error
Tonearm bearing
friction
(related to
stylus
tiP)
Stylus pressure
Cartridges
VVeight
Dual
606
Edition January 1980
AC 50 to 60 Hz
110 to
125V,
220t0 240V
electronically-controlled direct-drive system, Dual EDS 500
Motor at playing operation
approximately 2 watts <50 mW
220 V
50 Hz: at start
35 mA
110 V60
Hz: at start
65 mA
at play
15 mA at play
approximately 25 mA
2-
2.5s at 33
1/3
rpm
non-magnetic, 1.4 kg, 304 mm
diameter
33 1/3 and 45 rpm,
electronically adjustable
Separate for both speeds, each
adjustable by means of variable resistor, with
calibration scale;
range of
regulation: 10 %
with illuminated
stroboscope for platter speeds 33 1/3 and 45 rpm,
adjustable to 50 or 60 Hz
6
division markings per minute
at 50 Hz,
7.2 division
markings per minute at 60 Hz,
(German
I ndustry Standard) ± 0.05%
WRMS
±
0.03
%
Unweighted: 50 dB
Weighted: 75 dB
Torsionally rigid tubular aluminum
tonearm in low-friction four-point gimbal suspension
221
mm
24 0 4'
0.16 0
/cm
vertical
< 0.07 mN
10.007 g)
horizontal
<
0.15 mN
(0.015 g)
from 0 to 30 mN (0 to 3 g) infinitely variable with 1 mN- (1/10 g)
calibrations from 0 to 15 mN
(0
to
1.5
g) operable
from
2.5 mN
10.25 g)
stylus pressure up.
with
1/2
inch screw-type attachment. These
can be fitted with the special accessories
na-
262 186
which can be
obteined from trade dealers.
ca. 5.4 kg Dimensions and
Cutout Required refer to Installation
Instructions.
Dual Gebrüder
Steidinger • 7742 St. Georgen/Schwarzwald
Download from www.dual.de
Not for commerical use

Contents
Page
1
Technical data
2 Audio
connection diagram
3
Wiring
diagram
4
Dual EDS 500
electronic direct drive system
4
Replacement
of motor electronics
4
Replacement of motor mechanic
5 Adjustment of nominal speeds
5 Setting 78 rpm nominal speed
5
Stroboscope
5
Pitch
control
5
Tonearm and tonearm suspension
6
Removal of tonearm or spring housing
6
Removal of tonearm compl
. with tonearm suspension
6
Adjustment of tonearm suspension
6
Fitting a
1/2 inch cartrige
6
Antiscating
control
7
Cue control
7 Replacement of cue control assembly
7
Tonearm control
7
Adjustment point
7 Muting
switch
8
Start
ing and shut-off
8
Adjustment points: Segment
8
Power switch
8— 12
Replacement with exploded views
12
Lubrication
Fig. 1
Audio
Connection
Diagram
Kontaktplatte
Contact plate
Plaque
de contacts
rechter Kanal
Kurzschließer
Cynchstecker
DIN-Stecker
5-polig
right
channel
Muting
switch
phono plug
DIN-plug 5 pin
Canal droit
Court-circuiteur
fiche cynch
fiche DIN
5 pöles
rot / red /
rouge
1
I
I I
I I
grün / green / vert
I
schwarz / black / negro
blau / blue / bleu / \
•
/ \
I
weiß / white /
blanc /
•—/ L
linker Kanal
left
channel
Canal gauche
•
Masse draht
Mass lead
Mass cäble
•
•
2

Dl
ZPD
7,5
cl
47
2
10 k
1.1 •
2
•
66
2/3
Hz
(33
min
. ')
C2
220 v
C3
0,47 p
C4
--I
C4
0, 47 p
lll
T1
BC
172
83
68k
4 / 6
IC
1
4069
85 -
1 M
R4
22 k
--C 6
— 1 n
=-70 5 .
n
33
•
86
_150K 7.
R 8
-10k
C7
in
n 45
1
5
R7
810
„47k
_24k
T2
BC 1728
-'- 0,22 p
C 14
2 8 4
6 IC 2 — 555 —
3 3
7
1 5
18 11
110 k
2 /
6
IC
1
4069
0,14F
c9
20n
12
I i-
R
560
813
15 k
8.2
D2
1 N 4148
815
10 k
O
> C 10 "814
0 . 47 v
_220k
C 13 c=1"
474
öC 12
0,684
8.1
T3
BC 238 C
Transistoren von der Anschlußseite gesehen
Transistors as seen from the connecting side
Transistors vus du cöte des
connexions
iii
EBC
BD 415
E • • C
BC
172
BC
238 C
IC
von der
Bestückungsseite
gesehen
as
seen from
the top side
vu
du cöte elements
4069
555
13
812
270k
110/130
V-
220/240 V -
C 11
=?..10
R 17
47 k
47 phl
10 nF
Si
T0,063
A
220 V
818
2
T4
I NSD
102)
8D415
+22V
17,5V
je 53
20 n
C
56
10004
T
20 n
R
1 2
5 3
4
6
8
7
9
10
11
12
19
13
14
16
15
17
18
C
1
2
3
4
5
6
8
14 9
10
11 12
53
13
55
54

Drehzahlregler
/R
19
Platter speed
switch
/R
19 Motor
Commutateur de
vitesse
/R 19
Moteur
Netzteil
Supply
unit
Bloc
secteur
Generator
Generateur
Fig. 4
Fig. 5
Netetrato
Mains
Iransformer
Transtormateur
de räseau
Preluahlycheller
Platter speed
met.
Co.nutetee, de vitene
1.3
e-111±•
Cl
•
•
R16
)82
R 6
IC 1
7
8
C7
C5 6-11-•
Motor
Motor
Moteur
Glimmlampe
Glim
lamp
Lampe ä
effluves
T I
C13
4)-1 R13
02 w
h*
TC11
•-
o .
-•
T2
•
2112
C8j
...
clo•e•
e
,
_
6-1
R 1 5 r 7
2
" "
Direct Drive
System Dual EDS
500
For
repair of the
Dual EDS 500
special tools
and measuring
means are
required. Work on
the motor or
motor
electronics
System should, therefore,
only be carried
out by an
authorized
Dual service station.
Replacement of motor
electronics
1.
Extract unit plug from
power line. Lift off
platter 4. Bring
unit into head position.
2.
Remove machine screws
112 and cover of power
part.
3.
Unsolder connecting
leads to motor and
generator. Open
twists of
holding angle 150
with pliers. Remove
motor
electronics
152, screws 151 and
holding angle 150.
4.
Pull off motor electronics
152 system from motor 18
caref ul I y.
5. Fix replacement motor electronics.
Solder
connecting cables
(See
connection
diagram Fig. 5.
6. Slide
cover over power part
and fix lt by means of
machine
screws 112.
7. With
the unit in normal position
connect it to power line.
Switch on unit and
check power consumption on
operation:
220
V/50
Hz approx. 15 mA
110 V/60
Hz approx. 25 mA
Check nominal speeds.
If
necessary, readjust as described
below.
Replacement of
motor
mechanics
1. Extract
unit plug from
power line.
Remove
platter 4.
2. With the
unit in head
position remove
machine screws
174
and
washers 173. Pull
off motor
electronics board 172
together
with cover 175 carefully
from the motor
18.
3.
Loosen connection
for operating
voltage at
het plate 109.
Unsolder
connecting
leads to speed fine
adjustment
129,
rotary
svvitch 5 and the
generator. Open
twists of
holding
angle
152 with pliers.
4

Fig. 6
111
109
152
148
12
13
150
4
4.
Loosen
threaded pins 13 and
remove
platter cone 12.
Remove
the three screws
148. Lift off
motor mechanics
149.
5. Put
platter cone 12 on
new motor
mechanics
and fix it. Fix
new
motor
mechanics with
the three
screws 148. Fix
holding
angle
150 with screws
151. Insert
motor
electronics 152 and
twist
holding pieces.
Solder on
resp. plug connecting
leads
(fig. 51.
Push
cover on
power part and
fix it with
screws 112.
6.
With the
unit in
normal
position
connect it to
the power
line
Switch on
unit and
check power
consumption when
operating:
220
V/50
Hz
approx. 15 mA
110
V/60 Hz
approx. 25 mA
Check
nominal
speeds.
If
necessary,
readjust
as
described
below.
Setting
nominal
speeds
With
knob 7 bring the
fine speed
control 129/R 19
into
center
position. With controls R 8 and R 9 on the motor
electronic
system adjust nominal speeds. Control R 8 is used for 33 1/3
rpm, R 9 for 45 rpm. Check with strobe disk.
Changeover to 78 rpm nominal speed
Instead of 45 rpm the Dual
606 can be changed to
e nominal
speed
of 78 rpm.
To change the speed bring the
fine speed control 129/R 19 in
center position using
knob 7. Using control R 9 on
the motor
electronics board 152
adjust for 78 rpm. Check
with
strobe
disk.
Stroboscope
Accurate setting of the platter speeds 33 1/3 and 45 rpm can be
checked during play with the aid of the stroboscope.
When the platter 4
is rotating at exactly
33
1/3
or 45
rpm the
lines of
the
stroboscope appear to stand
still. If the lines move in
the direction of rotation of
the platter, the platter speed is too
high. If the lines move backwards, the platter is rotating more
slowly than the nominal speed. Adjustment of platter speeds 33
1/3 and 45 rpm is carried out
separately with the "pitch"
controls 7.
Strobe markings are provided on the outer edge of the platter for
50 and 60 Hz line frequencies.
To replace glow
lamp 157 remove machine
screws 160 and
remove strobe
cover.
lt can happen that
the stroboscope lines
appear to move
slightly
although the exact
speed setting with
stroboscope stationary has
not been
altered. This apparent
contradiction
is
explained by the
fact
that the
electronic central drive
motor
operates fully
inde-
pendently of
line frequency whilst the
only relatively accurate
line frequency of the
AC
current supply is
used
for speed mea-
surement with
the light stroboscope.
The
constantly
detectable
fluctuations of line frequency
by ± 2 % according to
the infor-
mation of the
electricity supply
companies
brief
frequency fluc-
tuations up to 1 % are
possible — only effect the
stroboscope
indication and can
cause the lines to
"wander" although
the
platter speed is as
constant and absolutely
accurate as before.
Pitch
Control
Each of
the two
standard speeds 33 1/3
and 45
rpm (78
rpm)
can be varied by
about 10 %. The
variable speed control
129/R 19
located in the
voltage divider is
adjusted by turning
the pitch
control knob 7. By
this the differential
amplifier is altered and
the
motor speed accordingly.
Fig. 7
,
eeee
t".>
45 U/rnin 50Hz
45U/min
60Hz
33
U/min
50Hz
33
Wmin 6oHz w.
Tonearm and
Tonearm
Suspension
Th efeather-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 0.16
mN (0.016
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
49, the
subsequent fine
adjustment by
turning the weight.
The
tracking force is adjusted
by turning the
graduated spring
housing 58 incorporating a coil spring. The
Rotary knob 54 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).
5

Fig. 8
Fig. 9
Fig.
10
33
32
58
54
55
61
63
211
212
210
208
210
207
206
To
Remove the
tonearm or the
spring
housing
1. Secure the
unit in a
repair stand.
Turn the
rotary turn
switch
51
to the zero
position.
Lock the
tonearm 48.
Remove the
counterweight 49.
2. Turn
the unit
over. Remove
the screening
sheet 140 and
solder off the
tonearm
connections at the
short circuiter
137.
Turn the
unit the right
way up.
3.
Remove the
fillister head screw
55. Remove the
rotary turn
switch 54 and
the washer
53.
4. Loosen
the nut 50 and
the grub screw
51. Draw
the tone -
arm 48
complete with
bearing 57 from the
bearing race
52.
The
spring housing
52 or the
tonearm 48 may
now be
changed.
Reassembly involves
the reverse
procedure.
Removing the tonearm from the bearing
frame
We
recommend the following
procedure:
1. Clamp unit
in the repair stand.
Set rotary knob 54 to
zero.
Lock
tonearm 48. Remove weight 49.
2.
Turn unit over and remove
the screening sheet 140.
Unsolder
the
tonearm connections on the
muting switch 137.
3. Remove safety
washer 187, washer 186 and
bearing 185.
Move positioning
bar 219 towards muting switch 137.
4. Unlock
tension spring 203, loosen
safety washer 217 and
remove skating lever 216.
5.
Remove safety washer 214
and sliding washer 213 and take
shut-off bar 161
from segment.
6. Slacken
hex nuts 210 and the screw
212. Remove the bearing
211 and segment 207.
7. Hold
tonearm 48.
Remove the machine
screw 35 and tone -
arm cpl.
with tonearm bearing.
Reassembly of
the tonearm involves the
reverse procedure.
Take
care that the grub screw 33 is
correctly seated in the bearing
when fasten ing
the frame 34.
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 33
and mat of the
vertical tonearm
bearing with
threaded pin 51.
Fitting a 1/2 inch cartridge
If a cartridge with 1/2
inch standard mount
is to be
fitted, the
conversion kit 31
Number 262 186
is necessary. The
proper me-
thod of fitting is shown in fig. 8.
Also the decorative cover
should be removed from
the counter-
weight 49 and should be
fitted with the
compensatory weight to
be found in the conversion kit 31.
Any
alteration can only be carried out with
the aid of a
Dual
-
Skate -0 -Meter and a test record and should
only be done by an
authorized service station.
Anti-skating Device
To
compensate for skating force use the knurled ring 68. The
asymmetric cam plate displaces the skating
lever 216 from
the
tonearm pivoting point. The anti-skating force is transmitted to
the segment
207 and to the tonearm 48 by tension
spring 208.
Optimum
adjustment is
carried
out at the works for
styli
having
a tip radius of 15 11m
(conical), 5/6
and 18/22 (elliptical).
Any
alteration can only be carried
out
with the aid
of a Dual
-
Skate -0 -Meter
and a test
record and should only
be
done
by an
authorized service station.
6

A
Cue
Control
By moving the
lever 194
forward (
•
lift cam 197
rotates. The
slide bar 219
connected to it transmits this
movement to the
lift
pin
206 (via the
compensating cam which
then raises the
tonearm. As a result, the cue control
permits setdown of the
tonearm at any
desird point.
The
lever
194 is
released
by moving the cue
control lever rear-
wards
1Z ). As a result of the
action of compression spring 204
the lift
pin
201 is
brought back to its normal position
and the
tonearm
lowered slovvly.
Lowering of the
tonearm is damped by
silicone oil
in the lift
tube.
Adjustment
Point
The
lift
height may be
varied by
turning
the sleeve
202. The
distance
between
the
record and
the needle
is to be 5
- 7
mm.
Replacement of Cue Control Plate
Replace cue
control plate 201 as follows:
1. Clamp unit
in the repair
stand and lock
tonearm. Turn
unit
over.
2.
Remove safety
washer 187, washer
186 and bearing
185. Lift
positioning
bar 219 and
move towards
muting switch 137.
3. Unlock
tension spring 208.
Loosen safety
washer 217 and lift
skating lever
216. Remove safety
washer 214 and
sliding bar
213. Lift
shut-off bar 161 from
segment 207.
4. Remove hex nuts
210 and the screw
212, and
the counter
bearing 211 and segment 207.
5.
Remove machine screws 205
and remove lift plate 201.
Reverse this procedure
when reassembling.
Tonearm
set-down mechanism
When turning knob
62 to "V" position
the recesses of slide
bar
219
are positioned in
the area of the spring
pin F of segment
207.
When moving slowly the
tonearm with tonearm cue control in
•
position the spring pin F is
arrested in the recesses of slide
bar 217 thus
designing the set-down point of
stylus for 30 cm
and
17 cm records.
To
enable set-down in the catching range
of the arresting point
of the appropriate setdown
position, the tonearm
set-down me-
chanism can be disengaged with the knob
62 in "—" position.
Adjustment Points
a)
Balance tonearm 48
exactly. Bring knob 62 into
"V" posi-
tion. Let tonearm catch
in catch point for tonearm
set-
down point. Check
catch force by means of a spring
balance.
lt should read 10 —
20 p. The force is adjustable by means
of
a threaded
pin.
b) The tonearm set-down point can be
adjusted by turning set
screw 45. Adjustment can be
made for 1 7 -cm- and 30 -cm
records.
Short
Circuiter
To
prevent disturbing noises
during automatic operation
of the
tonearm
the
unit is fitted with a short
circuiter.
Control of the
switch springs for both channels is effected by the
camwheel.
With the unit in neutral state the short circuit of the pick -up
leads is eliminated.
Adjustment
In
zero position
of the cam there should be a
clearance of ap-
proximately 0.5 mm between the
contacts of the short circuiter.
This clearance should be adjusted by bending the
short circuit
contact. The contacts should be
sprayed with a suitable cleaning
agent.
Fig. 11
187—ee
186-1
219
185
Fig. 12
207
'7
AZ Audolig: 3.1"
.1111
206
•
219
F
C12 mm
7

.1
Start ing
and shut off
Swinging in the tonearm 48 rotates the segment 207 thus actua-
ting the power switch 116 and shift arm 146 and starting motor
149 and platter 4 rotat
ing.
The shut-off cycle after playing a record is initated by the dog
M of the platter 4 and shut-off lever A.
The shut-off lever
A is
guided onto the dog
by the movement
of the tonearm when
playing the record with the aid of the shut-
off bar
161 proportionate to the groove lead.
The eccentrically-
mounted dog forces the shut-off lever A back with each revolu-
tion as long as the advance of the tonearm only amounts to the
width of one groove.
The cam
wheel '37 is thus guided to the pinion
range of the
platter.
The tonearm is lifted and the resetting bar 188 trans-
ports it back to the rest. The power switch is operated, thus
switching the unit
off.
Adjustment
Points
Power
Switch
Swing in tonearm
48 slide 117 of power switch 116 should
have a play of 0.2 —
0.5 mm. Make adjustments by bending
the switch lever 144.
Fig.
15
Replacement parts
Pos. Part.No. Qty
Description
1
220 213
1 Centering
piece
2 214 056 1
Washer
3 263 254
1 Platter
mat cpl.
4 263 256
1 Platter
cpl.
5 238 034
1 Switch
6 260 335 1
Rotary knob
7
260 336 1 Rotary
knob
8 242 191 3 Grub screw
M
3 x 3
9 263
257 1 Pitch cover
10 200 444 8 Spring
washer
11 239
414 3 Shipping
screw cpl.
12 242 192 1 Platter cone cpl.
13 242 191 3 Grub screw
M 3 x 3
14
262 634 1
Washer
3.2/15/0.6
17
232 975 3
Spring
mount cpl.
237 228 1 Spring mount cpl.
(Tonearm side
front)
18 230 529 9
Threaded piece
19 230 523 3 Compression spring
236 712 1 Compression spring
(Tonearm side
front)
20 200 723 4
Rubber damping
21
200 722 4 Steel
cup
25 263 259 1 Tonearm head cpl.
26 261 929 1 Tonearm lead cpl.
31
262
186 1 1/2 inch
conversion
kit cpl.
32 249 383
1 Counter nut
262 695 1 Counter nut
33 234 651 1 Grub screw
34
263 081 1 Frame cpl.
35 242 677
1 Machine screw
M 4 x 8
37 244 464 1 Cam wheel
38 210 146
4 Lock
washer
3.2
39
242 143
1 .
Tension spring
40
210
145 5
Lock
washer 2.3
Fig. 14
Segment
a)
When fixing the
segment 207 mowe surt
here is a play bet-
ween the
segment 207 and the
switch lever 144 of 0.5
mm.
b) The
shut-off point may be varied
with the eccentric E moun-
ted on the segment.
Fig.
16
Pos. Part.No. Qty
Description
41 242 141 1 Contact lever
44 263 339 1 Mounting plate
45 234
781 1 Adjust ment
46 234 818 1 Pin
screw
47 200 428 1 Clamping screw
48
264 020 1 Tonearm cpl.
49 263 263 1
Weight cpl.
263 328
1 Weight cpl. (UAP)
50
246 884 1 Counter nut
51
234 634 1 Grub screw
52 263 329 1 Bearing
frame cpl.
53 261 798 1 Washer
5.2/10
54
248 989 1 Rotary knob
55 249 097 1
Raised counter sunk head
screw
M 2.5 x 12
56 236 069 1 Machine screw
57 263 340 1 Bearing cpl.
58 263 339 1
Spring housing cpl.
59 248 979
1 Lifting plate
60 210 597 1 Washer
3.2/8/0.5
61 262 294 1
Hexagon sheet screw
B 2.9 x 6.5
62 260 334 1 Rotary knob
63 263 341 1
Rear covering cpl.
i 65 260 328 1
Stroboscope prism
66 263 342 1 Front covering cpl.
67 263 334 1
Tonearm rest cpl.
68 260 320 1
Cam disc
69 242
298 1 Washer
70 228
113 1 Washer
4.2/8/1
71 210
146 3 Lock
washer
3.2
72
200 444 4
Spring washer
8

Fig.
17
Exploded view 1
0
—
--
0
--
4
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0---
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0
,
47
9

Fig. 18 Exploded view 2
10