Akai AP-D40

X.
ELECTRICAL
ADJUSTMENT
a
1.
MODEL
AP-D40/C
1)
Off-set
Voltage
Adjustment
(VR3,
VR4)
and
Torque
Difference
Adjustment
(VRS)
a)
Disconnect
the
motor
connection
cord.
b)
Short
connector
(J1)
pins
@,
@
and
c)
Set
VR5
(300
kB)
to
the
centre.
d)
Move
the
Tone
Arm
and
turn
on
the
power.
e)
Connect
an
oscilloscope
to
terminal
@
of
connector
J1
and
adjust
VR3
(20
kB)
until
it
reads
—100
mV
DC.
f)
Put
the
Tone
Arm
on
the
Arm
Rest.
g)
Short
connector
(J1)
pins
©,
@
and
®.
h)
Move
the
Tone
Arm
and
turn
on
the
power.
i)
Connect
an
oscilloscope
to
terminal
@
of
connector
J1
and
adjust
VR3
(20
kB)
until
it
reads
—100
mV
DC.
j)
Put
the
Tone
Arm
on
the
Arm
Rest
and
con-
nect
the
motor
connection
wire
to
connector
(J1).
k)
Move
the
Tone
Arm
and
turn
on
the
power.
ek atl
Fig.
23
D.D
Servo
P.C
Board
APD-3051
1)
Connect
an
oscilloscope
to
©
and
@)
of
con-
nector
(J1).
Adjust
VR5
(300kB)
until
the
voltage
is
the
same
at
both
@
and
@
terminals
of
connec-
tor
(J1).
2) Speed Adjustment (VR1 and VR2)
a) Set the Speed Selector to 33-1/3 rpm.
b)
Set
the
Pitch
Control
Volume
to
the
centre.
c)
Move
the
Tone
Arm
and
turn
on
the
power.
d)
Adjust
VR2
(5
kB)
until
the
strobe
comes
to
a
standstill.
,
e) Set the Speed selector to 45 rpm.
f)
Adjust
VR1
(5
kB)
until
the
strobe
comes
to
a
standstill.
3) Wow and Flutter Confirmation
a) Playback the test record (3,000 Hz).
b)
Confirm
that
the
Wow
and
Flutter
is
within
0.035%
(JIS).
c) If not, adjust VR3, VR4 and VRS.
Tn
24