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Dual 1229 Q - Stroboscope and Speed Adjustment; Stroboscope Bulb Troubleshooting

Dual 1229 Q
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St
roboscope
The
exact
adjustment
for
33
1/3
and
45
r.p.m.
can
be
controlled
with
the
help
of
the
stroboscope,
including
when
a
disc
is
being
played.
The
ring
of
lines
on
the
strobe
will
appear
to
stand
still
when
the
turntable
(4)
rotates
at
the
correct
speed
(33
1/3
or
45
r.p.m.).
If
the
ring
of
lines
turns
in
the
same
direc—
tion
as
the
turntable
platter,
the
speed
of
the
platter
is
too
fast;
when
the
lines
move
in
the
opposite
direction
to
the
platter,
then
the
platter
is
rotating
slower
than
the
chosen
speed.
The
adjustment
is
made
with
the
"pitch"
knob
(8).
The
view
angle
of
the
stroboscope
can
be
rotated
by
turning
the
knurled
ring.
To
change
the
angle,
lasen
the
machine
screws,
slide
the
stroboscope
housing
(85)
11
50"
or
"60"
and
tighten
the
screws
again.
The
neon
lamp
(93)
can
be
changed
after
re—
moving
the
top
part
of
the
housing
(90).
When
replacing
the
neon
lamp,
be
sure
that
the
red
point
(p)
(Anode)
is
located
on
the
right
contact
spring
(unit
viewed
from
front).
Trouble
The
stroboscope
neon
lamp
(93)
does
not
light
up
when
the
unit
is
turned
on.
Cause
a)
Defective
neon
lamp
(93)
b)
Current
path
is
interrupted
Remedy
a)
Replace
the
neon
lamp
(93).
Make
sure
that
the
red
point
(Anode)
of
the
neon
lamp
is
located
on
the
right
contact
spring
(front
view
of
unit).
Fig.
4
b)
Check
the
connections
on
the
power
supply
switch
and
other
components.
Fig.
4
Stroboscope
Fig.
5
Wiring
diagram
,
1
,
Netzschalter
POWER
SWITCH
INTERRUPTEUR
SECTEUR
Fig.
6
Circuit
board(output
stages)

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