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Akai AP-D33

Akai AP-D33
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AP-D33/C
Vil.
ELECTRICAL
ADJUSTMENTS
AP-Q55/C
1.
MODEL
AP-D33/C
Fig.
14
DD
Servo
P.C
Board
APD-3313A
1)
Off-set
Voltage
Adjustment
(VR4,
VRS)
and
2)
Speed
Adjustment
(VR1
and
VR2)
Torque
Difference
Adjustment
(VR6)
a)
Set
the
Speed
Selector
to
33-1/3
rpm.
a)
Disconnect
the
motor
connection
cord.
b)
Set
the
Pitch
Control
Volume
to
the
center.
b)
Short
connector
(J1)
pins
@),
@
and
®.
c)
Move
the
Tone
Arm
and
turn
on
the
power.
c)
Set
VR6
(300
kB)
to
the
center.
d)
Adjust
VR1
(5
kB)
until
the
strobe
comes
to
a
d)
Move
the
Tone
Arm
and
turn
on
the
power.
standstill.
e)
Connect
an
oscilloscope
to
terminal
@
of
con-
e)
Set
the
Speed
selector
to
45
rpm.
nector
J1
and
adjust
VR5
(20
kB)
until
it
reads
f)
Adjust
VR2
(5
kB)
until
the
strobe
comes
to
a
-100
mV
DC.
standstill.
f)
Put
the
Tone
Arm
on
the
Arm
Rest.
3)
Wow
and
Flutter
Confirmation
g)
Short
connector
(J1)
pins
©),
@
and
®.
a)
Playback
the
test
record
(3,000
Hz).
h)
Move
the
Tone
Arm
and
turn
on
the
power.
b)
Confirm
that
the
Wow
and
Flutter
is
within
i)
Connect
an
oscilloscope
to
terminal
@)
of
con-
0.035%
(JIS).
nector
J1
and
adjust
VR4
(20
kB)
until
it
reads
c)
If
not,
re-adjust
VR4,
VR5
and
VR6.
-100
mV
DC.
j)
Put
the
Tone
Arm
on
the
Arm
Rest
and
con-
NOTE:
Return
Sensor
Sensitivity
Adjustment
nect
the
motor
connection
wire
to
connector
Set
the
Return
Sensor
Sensitivity
Adjust-
(iH).
ment’s
Semi-Fixed
Volume
VR3
to
fully
clockwise
(minimum
base
voltage
of
TR7.)
In
the
future,
Semi-Fixed
Volume
VR3
will
changed
to
Fixed
Resistor.
k)
Move
the
Tone
Arm
and
turn
on
the
power.
1)
Connect
an
oscilloscope
to
@
and
@)
of
con-
nector
(J1).
Adjust
VR6
(300
kB)
until
the
voltage
is
the
same
at
both
@
and
@
terminals
of
connector
(31).
23

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