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Akai AP-Q55

Akai AP-Q55
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AP-D33/C
AP-Q55/C
ee
CHI
VRI
CH2
3.5msec
Fig.
16
4)
Quartz-Lock
Phase
Adjustment
(VR1
and
VR2)
a)
Set
the
Quartz-Lock
Switch
to
ON
(LOCK).
b)
Set
the
Speed
Selector
to
45
rpm
position.
c)
Move
the
Tone
Arm
to
make
the
power
ON.
d)
Connect
the
oscilloscope’s
CH-1
to
P5-@)
and
CH-2
to
P5-@.
e)
Set
the
VR1
(500
kB)
to
mechanical
center.
f)
Adjust
the
VR2
(20kB)
so
that
the
phase
different
between
CH-1
and
CH-2
is
3.5
msec
as
shown
in
Fig.
16.
g)
Connect
the
oscilloscope
to
P5-@).
h)
Adjust
VR1
(500
kB)
and
VR2
(20
kB)
so
that
the
a=b
and
c=d
as
shown
in
Fig.
17.
5)
Wow
and
Flutter
Confirmation
a)
Put
the
Quartz
Switch
to
OFF.
b)
Playback
the
test
record
(3,000
Hz).
c)
Check
that
the
Wow
and
Flutter
is
to
within
0.035%
(JIS).
e)
If
not,
re-adjust
VR5,
VR6
and
VR7.
NOTE:
Return
Sensor
Sensitivity
Adjustment
Set
the
Return
Sensor
Sensitivity
Adjust-
ment’s
Semi-Fixed
Volume
VR4
to
fully
clockwise
(minimum
base
voltage
of
TR8).
In
the
future,
Semi-Fixed
Volume
VR4
will
changed
to
Fixed
Resistor.
25

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