Akai AP-002 User manual
1
:
-AKAI
SEMLAUTOMATIC
1
Th
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AP=-OO2
—
ALSO
APPLICABLE
To
MODEL
AP-OG2D
4
So
7
“
SEMI-AUTOMATIC
TURNTABLE
moveL
AP
-002
ALSO
APPLICABLE
TO
MODEL
AP-002D
SECTION
1
SERVICE
MANUAL
..............020
0204
3
SECTION
2
PARTS
LIST
...........0
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BI
Il.
IH.
IV.
VI.
VII.
SECTION
1
SERVICE
MANUAL
TABLE
OF
CONTENTS
SPECIFICATIONS
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DISMANTLING
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AUTOMATIC
RETURN
MECHANISM
.......
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1.
AUTOMATIC
RETURN
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9
2.
INOPERATIVE
PITCH
1.0...
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10
3.
FORCE
(MANUAL)
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10
VARIOUS
ADJUSTMENT
.........
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19
(1)
RETURN
POSITION
ADJUSTMENT
..
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20
(2)
CYCLE
CHANGE
(MOTOR
PULLEY
CHANGE)
.........
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20
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21
1,
LIFE
OF
NEEDLE
(STYLUS
TIP)
2.0...
0.
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21
2.
NEEDLE
CHANGE
...
1...
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3,
LUBRICATION:
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ADJUSTMENT
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24
Il.
SPECIFICATIONS
MODEL
AP-002
AP-002D
1,
TYPE
Belt
drive,
automatic
return
Belt
drive,
automatic
return
2.
CARTRIDGE
M.M
type,
APC-2
(VM)
M75B/2
3.
OUTPUT
VOLTAGE
2.2
to
4.4
mV,
2.2
to
6.0
mV
+
1000
Hz,
50
mm/sec
1000
Hz,
50
mm/sec
4,
FREQUENCY
RESPONSE
20
Hz
to
25,000
Hz
20
Hz
to
20,000
Hz
5.
CROSS
TALK
Better
than
15
dB,
Better
than
17
dB,
1,000
Hz
1,000
Hz
6.
OUTPUT
BALANCE
Within
3
dB
Within
2.5
dB
7.
COMPLIANCE
5
to
8x10
®cm/dyne
20x10
°cm/dyne
8.
STYLUS
PRESSURE
2.5
gr+15%
2.5
gr+15%
9.
STYLUS
TIP
0.5
mil
diamond
tip
(APN-2)
0.6
mil
diamond
tip
(N75B/2)
10.
TONE
ARM
Static
balanced
type
tubular
arm
with
Static
balanced
type
tubular
arm
with
in-
inside
force
canceller
and
lateral
balance
gide
force
canceller
and
lateral
balance
weight
weight
11.
MOTOR
4-pole
synchronous
motor
4-pole
synchronous
motor
12.
TURNTABLE
300
mm
aluminum
alloy
diecast
300
mm
aluminum
alloy
diecast
13.
REVOLUTIONS
33-1/3,
45
r.p.m.
33-1/3,
45
r.p.m.
14.
WOW
&
FLUTTER
Less
than
0.15%
Less
than
0.15%
15.
S/N
RATIO
Better
than
30
dB
Better
than
30
dB
16.
POWER
CONSUMPTION
Less
than
17W
Less
than
17W
17.
DIMENSIONS
|
442(W)x185(H)x377(D)mm
(17.4"°X7,3"'*14.8')
503(W)x185(H)x410(D)mm
(19.8°x7.3"x16.1"')
18.
WEIGHT
7
kg
(15.4
Ibs.)
8
kg
(17.6
Ibs.)
Il.
DISMANTLING
OF
UNIT
In
case
of
trouble,
etc.
necessitating
disassembly,
please
disassemble
in
the
order
shown
in
photographs.
Re-
assemble
in
reverse
order.
TABLE
SHEET
SCREWS
MECH.
BLOCK
Loosen
thise
Screws
only
slightly
Hl.
AUTOMATIC
RETURN
MECHANISM
i
RETURN-LEVER
@)
CRANK-LEVER-ASSY.
(6)
STOPPER-GEAR(7)
MAIN-GEAR(3)
HOLDER-BALL
(8)
STEEL-BALL(7)
cLutcH-assy.(4)
SHAFT-ASsv.(1)
TRIP
(5)
PLATE-REVECT
(2)
POLE-REUECT
(15)
((2)MINI-Sw.
PLATE-PU-ASSY
(©)
PLATE-ELEvate
(8)
AUTO-LEVER
@3)Pick-uP-ARM
(4)
PLATE-REJECT
(13)
PLaTE-
JOINT
Fig.
2
MAIN
PARTS
OF
AUTOMATIC
MECHANISM
SOUND
GROOVE
TRANSPORT
GROOVE
WIDTH
BETWEEN
PERTORMDNCES.
LEAD-OUT
GROOVE
PITC
DIAMETER
OF
—>
LAST
GROOVE
DIAMETER
OF
———>
LAST
SOUND
GROOVE
The
return
mechanism
of
this
machine
is
as
shown
in
Fig.
2.
Because
of
the
use
of
“speed
displacement
type”
perception
equipment,
when
the
program
(performance)
ends,
and
the
pick
up
needle
advances
in
lead-out
groove,
the
perception
equipment
operates
regardless
of
disc
size
(in
case
of
JIS
specification
equivalent).
That
is
to
say
that
because
the
speed
displacement
type
perception
equipment
operates
with
100%
certainty,
the
proper
type
of
record
becomes
important.
There
are
several
different
specifications.
For
instance,
domestic
JIS,
and
foreign
IEC,
RIAA,
etc.,
but
this
machine
is
designed
to
operate
as
per
JIS
specifications.
Below
is
a
summary
of
JIS
record
dimensions
necessary
for
automatic
return.
Transport
groove:
If
transport
groove
diameter
is
within
230
mm,
and
this
pitch
or
transport
width
is
within
1
mm.
Lead-out
groove:
Lead-out
groove
pitch
is
4
to
9
mm
and
linkage
is
made
to
the
last
groove
at
more
than
one
revolution.
Last
groove:
Last
groove
is
always
linked
from
lead-out
groove
at
concentric
circle.
RECORD
TYPE
17
cm
17
cm
25
cm
30
cm
HEADING
45
r.p.m.
33
r.p.m.
Last
Sound
Groove
Diameter
More
than
106
More
than
106
More
than
115.2
|
More
than
115.2
|Last
Groove
Diameter
97+1
9741
|
106.4+0.8
106.440.8
A
gear
the
same
as
the
pitch
of
MAIN
GEAR
(3)
is
installed
to
the
SHAFT
TABLE
ASSY
(1)
and
here
a
plectrum-like
part
projects
from
this
part.
Because
this
plectrum
is
for the
purpose
of
picking
up
the
timing
of
CLUTCH-ASSY
(4)
installed
on
the
MAIN-GEAR
(3)
it
rotates
with
the
turntable
during
record
performance.
AUTO
LEVER
(9)
is
linked
to
the
PLATE-PU-ASSY
(10)
which
is
directly
connected
to
the
pick
up
arm,
and
TRIP
(5)
begins
to
be
pressed
from
about
the
time
stylus
tip
reaches
the
lead-out
groove.
The
move-
ment
of
this
AUTO-LEVER
(9)
is
about
1/6
in
relation
to
the
movement
of
the
stylus
tip.
RETURN
LEVER
(11)
is
linked
to
MAIN
GEAR
(3)
by
CRANK
LEVER
ASSY
(13)
and
reciprocal
motion
is
in
accordance
with
MAIN
GEAR
(3)
revolutions.
Then
at
the
““”slanted
portion
(hatching),
PLATE
ELEVATOR
(16)
is
raised
and
the
lifter
(at
@
mark
position)
is
elevated
and
the
arm
returned
to
the
arm
rest.
Further,
because
current
ON-OFF
switch
MINI-
SW
(12)
is
installed
on
RETURN
LEVER
(11),
this
switch
operates
to
automatically
stop
turn
table
rota-
tion
when
the
pick
up
arm
is
returned
to
the
arm
rest.
Because
STOPPER
GEAR
(7)
controls
the
revolving
motion
of
MAIN
GEAR
(3),
it
operates
to
stop
rota-
tion
so
that
the
tooth
gap
part
comes
to
a
standstill
at
an
established
position
near
TABLE
SHAFT
ASSY
Q).
Also
in
case
the
record
is
stopped
during
performance,
PLATE,
JOINT
(13),
PLATE
REJECT
(14)
and
POLE
REJECT
(15)
are
intervened
by
the
forward
motion
of
CAM
REJECT
LEVER,
PLATE
REJECT
(2)
oper-
ates,
and
CLUTCH
ASSY
(4)
is
pushed
out.
1.
AUTOMATIC
RETURN
As
shown
in
Fig.
3
when
the
pick
up
arm
moves
to
the
record
surface,
the
PLATE-PU
ASSY
(10)
which
is
directly
connected
to
the
arm
shaft
separates
from
MINI
SW
(12),
power
source
is
turned
ON,
and
the
turntable
rotates.
As
the
pick
up
stylus
tip
traces
the
recorded
groove
of
the
record,
AUTO
LEVER
(9)
also
advances
on
the
inner
side
proportionately.
Be-
cause
this
AUTO
LEVER
advances
as
the
STEEL
BALL
(17)
on
HOLDER
BALL
(8)
rolls,
movement
is
ex-
tremely
smooth
and
there
is
almost
no
influence
extended
to
pick
up
arm
side
pressure.
In
due
time
the
pick
up
stylus
finishes
sound
groove
tracing
and
about
the
time
it
enters
the
lead-out
groove,
the
tip
of
AUTO-LEVER
(9)
begins
to
push
the
skirt
part
of
TRIP
(5)
and
the
CLUTCH
ASSY
(4)
which
rides
lightly
on
this
part
is
pushed
out
toward
the
TABLE
SHAFT
ASSY
(1)
(shown
in
Fig.
5,
when
the
pick
up
stylus
is
at
a
about
126
mm
position
from
the
turntable).
At
this
condition,
the
protruding
part
of
the
gear
on
TABLE
SHAFT
ASSY
(1)
is
drawn
to
CLUTCH
ASSY
(4)
and
the
MAIN
GEAR
begins
to
rotate
(Fig.
6).
Up
to
now
MAIN
GEAR
(3)
had
been
held
it
a
standstill
by
STOPPER
GEAR
(7)
and
a
smooth
stop
effected
by
the
teeth
gap,
but
when
the
condition
in
Fig.
6
is
assumed
the
teeth
begin
to
mesh
together
and
rotating
motion
begins.
Then
as
shown
in
Fi.
7,
this
motion
by
means
of
CRANK
LEVER
ASSY
(6)
moves
RETURN
LEVER
(11)
in
the
direction
of
the
arrow,
and
PLATE
ELEVATOR
(16)
is
raised
and
the
lifter
is
elevated.
When
pick
up
arm
elevatin
is
complete,
as
shown
in
Fig.
8,
the
part
indicated
by
broken
line
of
RETURN
LEVER
(11)
hits
the
cunion
part
attached
to
the
tip
of
PLATE
PU
ASSY
(10)
and
pick
up
arm
return
commences.
When
the
piick
up
arm
returns
to
the
rest,
the
RETURN
LEVER(#1)
by
means
of
CRANK
LEVER
(6)
moves
in
the
oppsite
direction
(broken
arrow
mark),
PLATE
PU
ASSY
(10)
returns
to
former
position,
and
in
due
car
rse
approaching
MINI
SW
(12)
is
operated
and
the
pwer
source
is
turned
OFF
so
that
the
condition
in
Fg.
3
is
re-assumed.
a
9
2.
INOPERATIVE
PITCH
As
can
be
seen
by
the
JIS
specification
summary
above,
record
sizes
entail
3
kinds
of
specifications,
and
these
are
classified
into
2
categories
which
are
directly
related
to
automatic
return.
These
are
17
cm
and
25/30
cm
dimensions.
For
perception
of
return
position
of
there
two
kinds
of
records,
in
the
case
of
in-
operative
part
of
gear
(less
than
1
mm)
the
operating
principle
of
the
perception
equipment
is
as
follows:
On
a
17
cm
record
the
last
sound
groove
trace
is
in
the
vicinity
of
110%.
However,
on
a
30
cm
record
the
sound
groove
has
already
ended
at
the
vicinity
of
110%
and
the
stylus
has
passed
the
lead-out
groove
and
is
moving
to
the
last
groove
(concentric
circle)
at
about
this
time
(1.8
mm
radius).
Therefore,
when
the
pick
up
arm
comes
to
this
vicinity,
if
it
is
a
30
cm
record,
return
operation
must
com-
mence,
and
if
it
is
a
17
cm
record,
the
last
trace
must
yet
be
effected.
The
difference
in
circumstances
of
these
two
records
lie
in
the
volume
of
movement
of
the
stylus
advancement
within
one
single
revolution.
In
the
case
of
a
17
cm
record,
because
this
pitch
is
very
limited
(less
than
1
mm),
it
is
satisfactory
if
the
CLUTCH
ASSY
is
kicked
back
by
the
protruding
part
of
the
TABLE
SHAFT
ASSY
as
shown
in
Fig.
10
each
time
the
record
makes
one
revolution.
For
details
of
this
kicked
back
condition,
refer
to
Fig.
11.
The
gamma
(y)
(kick
back
volume)
is
about
0.6
m/m
and
on
a
17
cm
record
even
with
a
transport
pitch
of
1
mm,
the
CLUTCH
ASSY
cannot
retrieve
this
kicked
back
portion.
Regardless
of
how
many
times
the
record
rotates,
the
transport
pitch
is
less
than
1
mm
and
the
clutch
assembly
continues
to
be
kicked
back.
(Fig.
12)
(Even
if
the
record
is
traced
to
about
97%
vicinity
(outside
of
specifications),
if
the
transport
pitch
is
less
than
1
mm,
return
will
definitely
not
be
effected
during
the
performance),
(this
occurs
only
when
the
TRIP
is
pushed).
However,
because
practically
all
marketed
records
are
JIS
ox
equivalent,
when
the
stylus
advances
to
about
106%
vicinity
and
moves
to
the
lead-out
groove,
the
transport
pitch
suddenly
increases
(4
to
9
mm).
When
this
happens,
the
CLUTCH
ASSY
movement
which
to
now
could
not
retrieve
the 0.6
mm
kick
back
volume
suddenly
is
increased
(over
1.2
mm),
and
on
the
next
revolution
when
the
protruding
part
ap-
proaches,
meshing
takes
place
and
return
begins.
In
this
manner
the
“speed
displacement
type
return
mechanism
utilizes
the
operating
pitch
and
regardless
of
whether
the
record
is
17
cm
or
30
cm,
return
is
effected
at
the
end
of
record
performance.
10
3.
FORCE
(MANUAL)
CUT
When
listening
to
a
record
and
you
wish
to
stop
in
the
middle
of
a
performance,
or
when
playing
a
record
not
according
to
specifications,
and
the
stylus
tip
has
advanced
to
the
last
groove,
simply
bring
the
cut
lever
forward.
This
moves
PLATE
REJECT
2
which
pushes
PLATE
JOINT
(13),
then
POLE
REJECT
(15)
and
ultimately
CLUTCH
ASSY
(4)
is
pushed
as
shown
in
Fig.
13.
(=
mark).
Then
return
operation
commences
and
the
power
source
is
turned
OFF
(Refer
to
Item
1
above
and
Fig.
5).
(2)
Mini-sw.
CRANK-LEVER-ASSY.
(6)
PLATE-PU-ASSY.
STOPPER-GEAR
(7)
(6)
PLATE-ELEVATOR
HOLDER-BALL
(8)
—
STEEL-BALL
(7)
(9)
AUTO-LEVER
cLUTCH-ASSY.(4)
SHAFT-ASSY.
(1) @3)
Pick-UP-ARM
TRIP
(5)
PLATE-REvECT
(2)
(PERTORMANGE.
BEG
INS)
a
OFF
Fig.
3
II
@MAIN-GEAR
CRANK=LEVER@©)
0
q
CLUTCH-ASSY.(4)
:
p
Ci
v
L2—
3"
ex
ca
SHAFT-ASSY.())
'
a4
=—”
@AUTO-LEVER
TRIPG)
&
(@)PLATE-REJECT
Fig.
4
CRANK-LEVER
©)
CLUTCH-ASSyY.
(4)
@)
AUTO-LEVER
SHAFT-assy,(1)
@PLATE-REVECT
TRIP
6)
Fig.
5
PICK
UP
ARM
STYLUS
TIP
IN
VICINITY
OF
126¢
12
CRANK-LEVER
©)
cLuTcH-assy.(4)
SHAFT-ASSy.(1)
\
©)
AUTO-LEVER
@
PLATE-REJECT
Fig.
6
MAIN-GEAR
REVOLUTIONS
BEGIN
(AUTO
RETURN
BEGINS)
tI
RETURN-LEVER
©)
CRANK-LEVER-ASSY.
(6)
STOPPER-GEAR
(7)
MaIN-GEAR
(3)
HOLDER-BALL
STEEL~BALL
(17)
TRIP)
SHAFT-ASsy.(1)
cLuTcH-assy.
(4)
PLATE-LEvECT
(2)
(2)
MINi-sw.
PLATE~PU-ASSY.
(6)
PLATE-ELEVATOR
(9)
auTo-Lever
@3)Pick-UP-ARM
Fig.
7
PICK
UP
ARM
ELEVATION
COMMENCES
7
/
:
!
2
(2)
miNni-sw.
vs
RD
!
7
:
a4
a
F
a?
PLATE-PU-ASSY.
CRANK-LEVER-ASSY.(6)
STOPPER-GEAR(7)
cutcH-assy.(4)
TRIP(S)
HOLDER-BALL
(8)
(@)PLATE-ELEVATOR
(8)
aUTO-LEVER
STEEL-BALL
((7)
SHAFT-ASSY.(1)
.
|
ot
“iS
cy
D4}
a
/
4
7
~
Dp
..
@3)Pick-up-ARM
MAIN-GEAR
(3)
—F
:
PRATE-REJECT
(2)
Fig.
8
PICK
UP
ARM
RETURN
COMMENCES
ST
oT
CRANK-LEVER-ASSY.(6)
<p
RETURN-LEVER
O—-(==K
STOPPER-GEAR
(7)
TRIP(S)
cLUTCH-assy.
(4)
HOLDER-BALL
STEEL~BALL
@)
sHarT-assy.(1)
MAIN-GEAR
(3)
PLATE-LEuECT
(2)
(2)mini-sw.
((0)PLATE-PU-aSsy.
((6)PLATE-ELEVATOR
(@)
auTo-Lever
(@3)Pick-uP-aRM
Fig.
9
PICK
UP
ARM
ON
REST
TURNTABLE
REVOLUTIONS
CONTINUE
CRANK-LEVER
©)
i
ai
eee
=
cLutcH-assy.
(4)
a
4
,
PATH
OF
,
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fr
3
ge
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PROTRUDING
PART
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ras
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aut
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tae
7
ae
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ESE
@PLATE-REJECT
TRIP)
-
Fig.
10
NON
RETURN
CONDITION
——
PATH
OF
——
@
CLUTCH-ASSY.
©
TRIP
@
MAIN-GEAR
Fig.
11
17
a
}
\
\
.
\
\
CRANK-LEVER
@)
\
\
(@)MAIN-GEAR
CLUTCH-ASSY.
4)
@
AUTO-LEVER
PATH
OF
PROTRUDING
part
SHAFT-ASSY.(1)
.
SS
a
WSs
,
ZB
@
PLATE-REJECT
\
TRIP)
CRANK-LEVER@)
>
es)
(@MAIN-GEAR
D
2
CLUTCH-assy.@)
(@)
AUTO-LEVER
Vi
SHAFT-ASSy.(L)——
TRIPG)
@)PLATE-REJECT
Fig.
13
FORCE
CUT
18
eS
Be
teal
Ch
IV.
VARIOUS
ADJUSTMENT
(Q)AUTO-LEVER
=PU
(OPLATESPU
RETURN
POSITION
ADJUSTMENT
SCREW
Fig.
14
PLATE
ROCK
INSTALLATION
SCREW
Fig.
15
19
GUIDE
-BELT
MOTOR-PULLEY
All
of
the
stationary
parts
of
this
machine
are
ideally
adjusted
prior
to
shipment.
However,
the
following
adjustments
are
necessary
according
to
circumstances
involving
usage:
(1)
RETURN
POSITION
ADJUSTMENT
Remove
turntable
and
loosen
the
plate
holder
metal
fitting
(PLATE
LOCK
(20)
).
This
can
be
accomplished
after
loosening
the
two
installation
screws
(19)
on
the
table
mount
2
or
3
turns.
(Fig.
15)
Because
this
separates
the
table
mount
and
the
cabinet
by
a
considerable
degree,
the
return
position
adjustment
screw
(18)
located
on
the
reverse
side
of
the
PU
Arm
becomes
accessible.
Adjust
with
plus
driver
(Fig.
14)
As
shown
in
Fig.
14
when
the
adjustment
screw
is
turned
to
the
right
(in
direction
of
solid
line),
the
return
position
is
slowed
(inside
circumference
ap-
proach)
and
when
the
adjustment
screw
is
turned
to
the
left
(in
direction
of
broken
line),
the
return
posi-
tion
is
speeded
up
(outside
circumference
approach).
(When
the
adjustment
screw
is
turned
1
revolution,
the
position
of
the
PU
Arm
stylus
tip
is
changed
by
about
8
m/m).
Always
confirm
this
adjustment
with
a
JIS
specifica-
tion
30
cm
LP
record.
Also
while
the
turntable
is
removed,
confirm
that
the
CLUTCH
ASSY
(4)
begins
to
move
out
when
the
PU
Arm
stylus
tip
is
64
mm
(R)
to
70
mm
(R)
from
the
turntable
shaft
center.
CAUTION:
If
adjustment
cannot
be
made
without
turning
the
adjustment
screw
(18)
more
than
2
revolutions,
becausé
this
is
likely
to
be
caused
by
improper
installment
position
of
PLATE
PU
ASSY
(10)
and
TRIP
(5),
CLUTCH
ASSY
(4)
etc.
(by
position
of
other
parts)
check
these
points.
Also
after
adjustment,
be
sure
to
return
installment
screws
(19)
to
former
position
and
tighten.
SET
SPEED
SELECTOR
TO
45RPM
POSITION.
(2)
CYCLE
CHANGE
(MOTOR
PULLEY
CHANGE)
Cycle
change
is
effected
by
changing
the
motor
pulley.
50
and
60
Hz
differentiation
can
be
determined
by
the
groove
on
the
60
Hz
pulley.
(See
Fig.
16)
_
While
viewing
horizontally
as
shown
in
the
figure,
install
so
that
the
lower
part
of
the
motor
pulley
brim
and
the
lower
part
of
the
GUIDE
belt
are
aligned
(Refer
to
figure).
(Set
Speed
Selector
to
45
r.p.m.
position).
When
the
player
is
turned
ON
and the
turntable
rotates,
if
a
rubbing
noise
from
the
belt
can
be
heard,
(except
while
switching)
and
operation
is
not
smooth,
further
adjust
pulley
height
by
moving
up
and
down
slightly
and
position
for
best
adjustment.
20
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