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Akai AP-D40

Akai AP-D40
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2.
MODEL
AP-Q60/C
1)
X’tal
Oscillation
Adjustment
(VC1)
a)
Connect
a
frequency
counter
to
test
point
TP4.
b)
Move
the
Tone
Arm
and
turn
the
power
on.
c)
Adjust
VC1
(15
P)
to
give
a
frequency
counter
reading
of
5.4
MHz.
2)
Off-set
Voltage
Adjustment
(VR3,
VR4)
and
Torque
Difference
Adjustment
(VR5)
a)
Disconnect
the
motor
connection
wire.
b)
Short
connector
(J1)
pins
@,
©
and
©.
c)
Move
the
Tone
Arm
and
turn
on
the
power.
d)
Connect
an
oscilloscope
to
pin
@
terminal
of
©
connector
(Ji).
Adjust
VR3
20
kB
until
it
reads
—110mV
DC.
:
e)
Put
the
Tone
Arm
on
the
Arm
Rest.
(Power
is
OFF).
Fig.
24
Quartz
Servo
P.C
Board
APQ-5038
f) Short
connector
(J1)
pins
©,
@
and
©.
g)
Set
VRS
(200
kB)
to
the
centre.
h)
Move
the
Tone
Arm
and
turn
on
the
power.
i)
Connect
an
oscilloscope
to
pin
@)
terminal
of
connector
(J1)
and
adjust
VR4
(20
kB)
until
it
teads—110mV
DC.
j)
Put
the
Tone
Arm
on
the
Arm
Rest
and
connect
the
motor
connection
wire
to
the
connector
(J1).
k)
Move
the
Tone
Arm
and
turn
on
the
power.
1)
Connect
an
oscilloscope
to
@
and
@)
of
connector
(J1).
Adjust
VRS
(200
kB)
until
the
voltage
is
the
same
at
both
@
and
@)
terminals
of
connec-
tor
(J1).
25

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