Dual CS 731 Q User manual

Dual
CS
7310
Service
Manual

Fig. 1 TA-Anschlußschema / Audio Connection Diagram / Schema de branchement / Esquema de conexion del fono captor
а)
mit
DIN-Stecker
5-polig
/
with
DIN-plug
5
pin
b)
mit
Cynchstecker
/
with
phono
plug
avec
fiche
DIN
5
pöles
/
con
enchufe
DIN
de
5
poles
avec
fiche
cynch
/
con
enchufe
Cynch
rechter Kanal
right channel
canal droit
сапа! дегесћо
rot / гей / rouge / rojo
rechter Kanal / right channel
Canal droit / Canal derecho
rot (schwarz) /red (black)
rouge (noir) / rojo (negro)
linker Kanal / left channel
|
Canal
droit
/
Canal
izquierdo
1 gelb (weiß) / yellow (white)
| jeune (blanc) / amarillo (blanco)
|
= 4
f
у
Tonabnehmerkabel
гд
PS
Ns «| Tonearm audio cable E) |
Cable
de
BF
M
Ee
Сава ве чопекаркег ! Г. Cynch-Tonabnehmerkabel
l
|.
Pick-up
lead
with
Cynch
plug
linker Kanal 1 1 Cable de BF avec fiche Cynch
left
channel
|
|
Cable
del
fonocaptor
con
canal gauche Ї | enchufe Cynch
canal izquierdo Masse draht / Mass lead !
мей / white / blanc / blanco Mass cable / Masa cable | |
|
| |
Masse rechter Kanal H— Masse linker Kanal
Mass
right
channel
|
I
`
Mass
left
channel
Masse canal droit d | — Masse canal gauche
Stummschaltrelais
тава
canal
derecho!
|
тава
canal
izauierdo
Silent
switch
relay
|
!
Relais — conmutateur Stummschaltrelais ! |
silencieux Silent switch relay ! |
Relé de conmutacion Relais — conmutateur silencieux | |
silenciosa \ Relé de conmutacion silenciosa t. d
scis Р! RN ас ——
roter See =|
rechter Kanal
right channel
canal droit
canal derecho
rot / red / rouge / rojo
1 ] | | | ! 1
| linker Kanal
|
left
channel
| canal gauche
| canal izquierdo
weiß / white / blanc / blanco
Kurzschließer
Muting switch
Court-circuiteur
Ї Dispositivo cortocircuitador
!
1 Masse linker Капа!
1 Mass left channel
|
Masse
canal
gauche
| masa canal izquierdo
blau / blue / bleu / azul
Masse rechter Kanal
Mass
right
channel
Masse
canal
droit
masa canal derecho
grün / green / vert / verde
Masse schwarz
|
Ц
!
Mass black
ol | Masse noir
1----
Masa
negro
1 Masseblech
4) Mass sheet E ZEZA
Prise де masse
chapa de masa
Tonarmkopf
Tonearm head
Téte magnétique
Cabezal
fonocaptor
Kontaktplatte
Contact plate
Plaque de contacts
Placa de contacto
Zb

Contents
т
Ф ‹ ‹ю © ‹© ф® с оо со © оо оо єз 4 4 4 © ®› Ф› Ф Ф Ф Ф лл D WN È
Ф
Technical data
Current type
Line voltages
Drive
Power consumption
Run-up time
Platter
Platter speeds
Pitch control
Speed check
Sensitivity of light stroboscope
for 0.3 % speed deviation
Wow and flutter
Signal-to-noise ratio
Tonearm
Effective tonearm length
Offset angle
Tangential track error angle
Tonearm bearing friction
(related to stylus point)
Tracking force
Pick-up head
Cartridge
Weight
Tonearm connection diagram
Technical data
Block diagram
Direct drive system EDS 920
Wiring diagram
General
Fascia
Motor and drive
Replacing motor electronic system
Replacing motor mechanical system
Pitch control
Stroboscope
Tonearm and tonearm suspension
Fitting a 1/2“ cartridge
Removal of tonearm from bearing frame
Removal of complete tonearm
Replacement of spring housing
Adjustment of tonearm suspension
Anti-skating control
Tonearm cue control
Adjustment point
Replacement of cue control plate
Tonearm control
Continuous play
Starting
Manual start
Muting
Shut-off
End of play shut-off
Adjustment points
Power fuse
Tonearm set down point
Shut-off point
Tonearm lift off height
Pull magnet “start/stop”
Pull magnet “сиеїпд”
Tonearm does not set down
Vertical tonearm movement is inhibited
Platter does not rotate
Tonearm does not set down on edge
Motor does not shut-off
Spare parts list with exploded views
Lubrication instructions
AC 50 or 60 Hz
110 — 125 V and 220 — 240 V
Quartz stabilized electronic direct drive system Dual EDS 920, PLL control
Approx. 4 УУ, motor during play < 50 mW
{until
nominal
speed
is
reached)
approx.
1.8
sat
33
rpm
Non-magnetic dynamically balanced, complete rotary mass detachable approx. 1.5 kg
33 and 45 rpm, electronically switchable, quartz stabilized
In PLL technology, quartz accurate for both speeds, separately adjustable,
range of adjustment + 5.5 96
Quartz accurate, illuminated stroboscope with automatic frequency switch-over
for 33 and 45 rpm
20 graduations per minute
DIN < t0.025 96
WRMS < +0.015%
Rumble unweighted signal-to-noise ratio > 52 dB
Rumble weighted signal-to-noise ratio > 7598
Torsion-resistant “ultra-low-mass” aluminum tonearm, in gimbal 4-point
suspension, tonearm balance weight with tuning anti-resonator
221mm
2604!
0.169 /ст
Vertical < 0.07 mN (0.007 g)
Horizontal <0.15mN (0.015 g)
From 0 — 20 mN (0 - 2 g) infinitely variable with 1 mN (0.1 а)
Calibration in range from 2 — 15 mN (0.2 - 1.5 g)
Detachable, suitable for ultra-low-mass cartridges, with long carrier plate (accessory),
also suitable for cartridges with Dual shap-in mounting and for cartridges with 1/2"
mounting
and
a
weight
of
2
to
9
g
(including
mounting
hardware)
Adjustable overhang: 5 mm
See separate data sheet
Approx. 8 kg

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EDS
920
direct
drive
system
The
newly
developed
direct
drive
system
of
the
CS
731
О
turn-
table
is
a
successful
synthesis
of
our
well-known
motor
principle
and
a
highly
sensitive
electronic
system
which
receives
its
accu-
racy
from
a
quartz
crystal.
The
drive
motor
is
a
DC
motor
with
по
commutator
in
which
commutation
is
carried
out
by
two
Hall
generators
which
detect
the
position
of
the
rotor
equipped
with
an
8-pole
ring
magnet
and
which
also
actuate
the
corresponding
windings
of
the
rigid
flat
coils.
The
synchronously
rotating
mag-
netic
return
circuit
plate
and
the
ring
magnet
enclose
with
a
small
air
gap
the
non-ferrous
coil
arrangement
so
that,
on
the
one
hand,
the
drive
system
displays
an
extremely
uniform
running
characteristic
without
pole
sensitivity
and
which
displays,
on
the
other
hand,
a
high
torque
in
spite
of
the
economical
energy
supply.
After
the
nominal
speed
has
been
attained,
the
energy
supply
required
for
maintenance
of
rotation
is
less
than
50
mW.
Fig.3
Description of function
At
a
motor
speed
of
33
1/3
rpm,
the
200-pole
frequency
genera-
tor
rigidly
coupled
to
the
motor
delivers
a
frequency
of
111
Hz
which
is
amplified
in
the
input
amplifier
and
prepared
in
the
cam
form.
This
signal
is
applied
as
an
actual
value
to
the
PLL
circuit.
An
oscillation
frequency
of
4.608
MHz,
which
is
controlled
by
a
highly precise quartz crystal,
is generated
in the quartz oscillator.
The
actual
reference
frequency
—
that
is
to
say,
the
set
value
—
is
derived from the oscillator
frequency
by a multi-stage
divider.
In
the
PLL
circuit,
the
actual
value
and
set
value
are
compared
with
one
another
as
regards
amount
and
phase.
In
the
case
of
the
slightest
deviation,
a
control
pulse
is
applied
to
the
digital/analog
converter
which
obtains
from
this
an
analog
control
signal
which
is
converted
into
a
current
alteration
in
the
subsequently
connec-
ted
motor
control
circuit.
In
the
drive
motor,
this
current
altera-
tion
causes
spontaneous
stabilization
of
the
minimal
speed
devia-
tion.

The
set
value
necessary
for
the
45
rpm
speed
is
generated
in
the
voltage
divider
by
alteration
of
the
divider
ratio.
For
pitch
control,
а
continuously
variable
control
signal,
with
which
the
control
loop
is
fed,
is
obtained
by
means
of
a
complicated
division
pro-
cess.
Thus the complete control range, like the nominal speeds, is
coupled in a locked-phase relation to the quartz oscillator. The
speed accuracy in the pitch range is practically the same as in the
case of nominal speed. The speed deviation preselected with both
pitch controls is maintained even if the pitch switch is operated
or if the unit is seitched off.
In the speed logic, the display unit of the CS 731 Q obtains from
the actual speed the basic information as to whether the actual
speed of the nominal speed is faster or slower. A further logic sy-
stem activates the plus or minus sign of the display unit. Both
signals are dark at rated speed.
From the digital information on the actual speed, a further
digital /analog converter receives relative and analog information
which is transformed in the cascade switch to an activation voltage
for the 13 digital displays. In the display itself the information is
still completely analog as the individual digits are activated with
differentiated voltages and light up accordingly.
This display is as accurate as it is practical. The power section
supplies the various partial circuits with carefully filtered and
stable operating voltages.
General
The listed item numbers refer to the following spare parts lists
and exploded views.
The cover can be easily withdrawn from the hinged splice pieces.
To
remove
the
turntable,
remove
both
fillister
head
screws
(98)
and the discs (86) with which the mounting plate (197) is screwed
down.
The
turntable
can
be
lifted
out
of
the
bracket
(12)
after
disengaging the three transport locking screws.
Now detach the following plug connections:
1)
Both
single-pole
plugs
(722)
on
power
switch
(106).
2)
The
4-pole
plug
(160)
on
the
solenoid
protective
circuit
(185).
3
The 5-pole female multi-point connector (158) at the display
unit
(35).
4
The 5-pole female multi-point connector (185) at the distri-
butor board (24).
Fascia
To dismantle the fascia, remove both attachment screws (21)
with which the display unit is mounted on the bracket base.
bracket base.
The top of the plate (17) is attached with 3 fillister head screws
(98) and three washers (86) and the bottom is attached with
three cheesehead screws (50).
Fig. 4
Motor and drive
Special
tools
and
measuring
instruments
are
necessary
for
repair
of the Dual EDS 920. Therefore,
work on the motor or the motor
electronic
system should only be carried out by an authorized
Dual service station.
Replacement of the motor electronic system, complete
The
individual
modules
(151/152/153)
are
plugged
into
the
main
board. In addition, they are held by means of supports (154).
Moreover, module 1 is also secured with the fixing screw (159).
When replacing the complete motor electronic system, proceed
as follows:
1) Remove the fillister head screws (97) and the four supports
(154).
2) Remove fixing screw (159) (module 1).
3) Detach the plug connections fo the connection cable — refer
to wiring diagram Fig. 3.
4
Detach the motor electronic system completely from the
mechanical system of the motor and replace it.
Replacement of the mechanical system of the motor
1) Release both threaded pins (19) and withdraw plate cone (22).
2) Remove the complete motor electronic system — see above.
The plug connections of the connecting cable need not be
removed.
3) Remove both fillister head screws (99) and the cog (105).
4) Withdraw the mechanical system of the motor and replace it.
Fig.5
97
14
14
Pitch control
With the pitch control, each of the two rated speeds, 33 1/3 and
45 rpm, can be varied by + 5.5 96. With the seesaw switch (16) at
"ОМ" position, each nominal speed can be altered by means of a
separate potentiometer (14). At the same time, the optoelectronic
display scale (35) indicates the percentage deviation from the
nominal speed.
Independently of the potentiometer setting (14), the speed cor-
responds
with
quartz
precision
to
the
respectively
switched
no-
minal speed, if the seesaw switch (16) is in “OFF” position.
Stroboscope
The
stroboscope
markings
on
the
turntable
edge
are
flashed
from
the diode plate (148) by means of quartz accurate
frequency.
The display
is independent
of power frequency
and does not re-
quire additional
stroboscope
markings
for different
speeds and
line frequencies.

When
the
stroboscope
markings
seem
to
be
stationary
both
по-
minal
speeds
(33 1/3
and
45
rpm)
are
accurately
adjusted.
If
the
markings
seem
to
run
ahead
the
speed
is
higher.
If
the
markings
seem
to
run
back
the
speed
is
lower
than
the
nominal
speed.
By
means
of
the
speed
of
the
apparently
“wandering”
markings
the
speed
selected
with
potentiometer
(14)
can
be
determined
at
high
speeds:
1
graduation/sec.
=
0.9
96
deviation.
After
releasing
the
fixing
screw
(159)
and
removing
both
fillister
head
cap
screws
(96)
the
stroboscope
housing
can
be
removed
(149).
After
re-
moving
the
retainer
piece
(147)
the
three
LED's
(148)
can
be
re-
placed.
Tonearm
and
tonearm
suspension
The
light,
torsion-resistant
all-metal
tonearm
is
twingimbal
mounted.
Suspension
is
by
means
of
four
hardened
and
precision
polished
steel
points
which
rest
in
precision
ball
bearings.
The
tonearm
bearing
friction
is
thus
reduced
to
a
minimum.
Bearing
friction
vertical
0.07
mN
(0.007
g)
Bearing
friction
horizontal
0.15
mN
(0.0159)
as related to stylus point.
This
ensures
extremely
favorable
pick-up
conditions.
Before
setting
the
tracking
force
corresponding
to
the
built-in
pick-up
cartridge
the
tonearm
is
balanced
at
O
position
of
the
tracking
force
scale.
Coarse
adjustment
is
carried
out
by
moving
the
weight
with
stem
(60)
subsequent
fine
adjustment
by
turning
the front knurled
ring on the weight.
The
balance
weight
is
designed
so
that
pick-up
cartridges
having
a
dead
weight
(including
fitting
material)
of
2
—
9
g
can
be
balanced.
The
tracking
force
is
produced
by
tensioning
the
coil
spring
fitted
in
the
spring
housing
(74).
The
rotary
knob
(69)
is
provided
with
a
scale
which
permits
accurate
adjustment
of
the
tracking
force
in
the
range
from
0
—
20
mN
(0
-
2
p)
by
means
of the
marking
dots.
Fitting a 1/2" cartridge
The description of retrofitment for fitting а 1/2“ cartridge (ге-
placement of carrier plate etc.) should be taken from the opera-
ting instructions.
Fig.7
27
52
84
Fig.6
Й
147
146
149
96
Ветоуа! of tonearm from bearing frame
1) Secure unit in repair jig. Remove weight (60). Unscrew ten-
sioning screw (52). Set rotary knob (63) to 0.
Turn unit upside down.Remove hexagon nut (34) and screening
plate (119). Unsolder tonearm leads on muting switch (120).
Unscrew tensioning screw (70). Remove rotary knob (69),
disc (68) and indicator (67).
4) Loosen locking nut (61) and unscrew threaded pin (65).
5) Remove tonearm (30) with bearing (71).
Assembly takes place in reverse order.
2
3|
Removal of tonearm assembly with tonearm bearing
Proceed as follows:
1, Secure unit in repair jig. Set rotary knob (69) to 0. Lock
tonearm (30). Remove weight (60)
2. Turn unit upside down. Remove hexagon nut and screening
plate (119). Unsolder tonearm leads on muting switch (120).
3. Remove retainer disc (91). Remove main lever (167) and
bearing block (166). Remove securing disc (89). Lift off ad-
justing bar (168) and rotary bearing (170) and swivel to motor.
141
187
96
168
190
167 176
97

4.
Disengage
tension
spring
(136).
Release
securing
disc
(90)
and
remove
skating
lever
(134).
5.
Remove
hexagon
nuts
(94).
Remove
countersunk
screw
(138).
Remove
counterbearing
(135)
and
segment
(124).
6.
Retain
tonearm
(30)
and
frame
(63).
Remove
filister
head
cap
screw (88). Remove
tonearm
complete
with tonearm
bearing.
When
fitting
the
tonearm
proceed
in
reverse
order
but
ensure
that
the
threaded
pin
(62)
seats
correctly
on
ball
bearing.
Replacing spring housing
Remove tonearm (30) from bearing frame (66) as described
above.
When
installing
notice
that
the
helical
spring
engages
in
the
cut-
outs of the bearing
(71). Mount tonearm
(30) again. Set bearing
play
as
described
below
using
threaded
pin
(65)
and
lock
nut
(61).
Adjusting the tonearm bearing
First
balance
tonearm
accurately.
Both
bearings
must
have
slight,
just
perceptable
play.
The
horizontal
tonearm
bearing
is
correctly
adjusted
when
at
anti-skating
setting
0.5
and
being
touched
it
slides
in
without
resistance.
The
vertical
tonearm
bearing
is
cor-
rectly
adjusted
when
it
swings
in
after
being
touched.
The
play
of
the
horizontal
tonearm
bearing
should
be
adjusted
with
thre-
aded
pin
(62),
the
play
of
the
vertical
tonearm
bearing
with
threaded
pin (65).
Anti-skating device
Adjustment of anti-skating force is carried out by means of
turning the knurled ring on the cover. According to adjustment
the asymmetrical cam disc guides the skating lever (134) from
the tonearm pivot point. The anti-skating force is transmitted to
the segment (124) by means of tension spring (136) and to the
tonearm.
Optimum adjustment is carried out at the works for styli with a
tip radius of 15 um (conical), 5/6 x 18/22 ит (elliptical) and CD
4 cartridges.
Any alteration can only be carried out with the aid of a Dual
skate-O-meter
and
a
test
record
and
should
only
be
done
by
an
authorized Dual service station.
Cue control
By moving lever (187) forward (Y.) lift cam (188) rotates. The
slide bar (168) connected to it transmits this movement to the
lift
pin
which
then
raises
the
tonearm.
As
a
result
the
cue
control
permits set down and lift off of the tonearm at any desired point
outside the shut-off range.
The slide bar (168) is released again by moving the cue control
lever (187) to the rear (X). As a result of the action of compres-
sion spring the lift pin is returned to neutral position and thus
lowers the tonearm. Lowering of the tonearm is damped by
silicone oil in the lift tube.
The set down speed can be varied by adjusting the pretension
of compression spring (lift plate 176). According to operation of
the
adjusting
ring
(82)
in
position
"4"
the
lowering
speed
is
slower, in position "444" it is faster.
Adjustment point
The lift height can be varied by turning adjusting screw (51). The
distance between record and stylus should be approximately 5 mm.
63
|—
62
74
66—
a
69
70
65-
e
=
тз
т
72
8t
82
83
ын
485
124-
94
138
Replacement of cue control plate
Replace cue control plate as follows:
1. Fix unit on repair jig and lock tonearm. Turn unit upside
down.
2. Remove securing disc (89). Detach main lever (167) and
bearing block (166).
3. Remove securing disc (89). Remove adjusting bar (168) and
rotary bearing (170) and swivel to motor.
4. Remove both filister head cap screws (97), remove cue control
plate complete (176).
Fitment takes place in reverse order. It should, however, be noted
that the pressure piece in the cue control plate (176) engages
correctly in adjusting ring (82) (varying the lowering speed.
Fig.9
е 9
Tonearm control
Automatic movement of the tonearm is indicated by the control
cams
on
the
inside
of
the
cam
wheel
(16)
on
rotating
through
3600.
The
control
elements
for
raising
and
lowering
are
the
control
lever
(167)
and
the
lift
pin,
for
horizontal
movement
of
the
tonearm
control
lever (167) with segment
(124).

The
automatic
set
down
point
is
designed
for
30
ст
and
17
ст
records
and
is
coupled
to
the
platter
speed
changeover.
Set
down
points
of
the
tonearm
are
determined
by
means
of
stop
of
spring
bolt of segment
(124) at the adjusting
bar (168). Limitation
of
the
horizontal
movement
of
the
tonearm
is
produced
by
stop
of
segment
on
adjusting
bar
(168)
which
is
lifted
off
only
during
set
down
by
the
main
lever
(167)
and
reaches
the
swivel
range
of
the
spring
bolt
on
the
segment.
On
completion
of
set
down
(lowe-
ring
of
the
tonearm
onto
the
record)
slide
bar
(168)
is
released
again
and
returns
to
its
neutral
position.
As
a
result,
this
is
out-
side
the
range
of
the
spring
bolt
so
that
unimpeded
horizontal
movement
of
the
tonearm
is
possible
for
playing.
Continuous automatic play
The
continuous
automatic
play
is
operated
by
turning
knob
(84)
to "00".
Switch
bracket
(179)
is actuated
by knob
(84).
Switch
rod
(180)
keeps
change
lever
(165)
in start
position.
After playing the record the tonearm returns automatically to
the
lead
in
groove
of
the
record.
This
process
will
be
repeated
until knob (84) is in position “17.
Adjustment point
Withdraw power plug. Remove turntable (3). Bring knob (84) to
position “оо”, Turn cam wheel to center position. The change-
over lever deflects the cam follower lever (U). By this means the
cam follower lever tip must be brought at least to the cam track
center. Adjustment by bending the switch rod (189).
Starting
Operation of push-button (59) “start” results in the following
functions:
a) The right hand pull magnet (142) operates cam followerlever
(165). At the same time the power switch (106) is operated
by the contact arm (127) coupled to the switching arm (78)
and the motor and turntable start to rotate.
b) This operation also releases start slide (39) which is drawn in
the direction of the cam wheel by means of the tension spring
(38). By this means the shut-off lever (8) on the cam wheel
(25) is brought into the range of the follower (M) (plate cone
22) and the cam wheel driven by this means.
Manual start
The detent (126) coupled to control arm (78) engages in the
square plate (125) when the tonearm is moved inward by hand
and retains the tonearm in this position. The power switch is
operated by the control arm and thus the motor and platter
start to rotate. After reaching the run-out groove of the played
record return of the tonearm and shut-off of the unit take place
automatically. If, on the other hand the tonearm is lifted off the
record
before playing
is
completed
and
moved
onto
the
rest
by
hand, the pin of segment (124) disengages the detent (126) so
that
the
control
arm
is
returned
to
its
starting
position.
As
a
result, the power switch shuts off the power supply.
Muting switch
To prevent disturbing noises during automatic operation of the
tonearm the unit is fitted with a muting switch. Control of the
switch springs for both channels is effected by the cam wheel.
With the unit in neutral state the short-circuit of the pick-up
leads is eliminated.
Adjustment point
In neutral position of the cam wheel a contact distance of ap-
proximately 0.5 mm should be present between contact springs
(F) and short-circuit strips (L). If necessary bend short-circuit
strips.
Spray contact springs with suitable means.
167 91 124 134
Fig. 11
22M 25 A 37 128 36
Stopping
When
push-button
(59)
"зор"
is
operated
the
changeover.lever
(165)
is
brought
into
stop
position
by
means
of
the
left
hand
pull
magnets
(142).
As
a
result
the
start
slide
is
released
which
is
drawn in the direction
of the cam wheel by means of tension
spring (38). By this means the shut-off
lever is brought
into the
range
of
the
follower
on
the
platter
pinion
(PR)
and
the
cam
wheel (25) is thus driven.

Shut-off operation
The
functions
of
end
switch-off
and
stop
switching
are
determi-
ned by the position
of the deflection
lever (U). The deflection
lever (U) is broughtto
stop position
bythe main lever (167) after
every start operation
(longer end of deflection
lever to cam wheel
center).
‚After
playing
of
a
record
shut-off
is
initiated
by
the
follower
(M)
of
the
platter
(3)
and
the
shut-off
lever
(А).
The
shut-off
bar
(128)
is
only
moved
synchronously
by
the
bolts
of
the
segment
(126)
in
the
shut-off
range.
In
the
shut-off
range
(records
116
to
122
mm
0)
the
shut-off
lever
(A)
is
guided
onto
the
follower
(Fig.
13
a)
by
the
shut-off
bar
(128).
The
follower
(M)
engages
shut-off
lever
(A).
By
this
means
cam
wheel
(25)
is
brought
out
of
zero
position
in
engage-
ment
with
pinion
of
platter
(Fig.
13
b).
The
main
lever
(167)
guides
the
tonearm
back
and
effects
tonearm
lowering
onto
the
support.
During
run-in
of
the
cam
wheel
into
zero
position
the
roller
(76)
of
the
switching
arm
(78)
run-in
to
the
cut-out
provided
on
the
cam wheel and operate
the power switch (106).
Adjustment points
Power fuse
After
removing
both
fastening
screws
and
detaching
power
secti-
on cover the fuse (102) on the power plate (101) can be replaced.
Tonearm set down point
The set down point of the tonearm can be altered with the ec-
centric bolt (172). If the stylus sets down too far in or out on
the record turn the eccentric bolt (172) correspondingly right or
left.
Shut-off point
The shut-off point (shut-off range records 116 — 122 mm ф) can
be
altered
with
the
eccentric
(E)
on
the
segment
(124).
Tonearm lift-off height
The tonearm lift-off height (during automatic operation) can be
altered with adjusting sleeve (177). Withdraw power plug. Un-
lock tonearm. Rotate cam wheel (25) out of zero position until
tonearm has reached its highest point.
The tonearm should be approximately 5 mm above the tonearm
support stop (Fig. 16). If necessary, turn adjusting sleeve (177)
to left or right.
Fig. 13
Fig. 14
Fig. 15
Fig. 16