Akai AP-D40

TP |
/2Vi
3)
Quartz
Lock
Adjustment
a)
Set
the
Size
Selector
to
MANUAL
and
turn
on
the power.
b)
Set
the
Speed
Selector
to
45
rpm
and
the
Quartz
Switch
on.
c)
Connect
an
oscilloscope
to
test
point
TP3.
d)
Adjust
VR7
(500
kB)
to
give
the
waveform
in
Fig.
25.
26
fw
VRI
CH2
3104 LL
msec
Fig. 26
4) Speed Adjustment (VR2)
a) Put the Quartz Switch to OFF.
b)
Set
the
Speed
Selector
to
33-1/3
rpm.
c)
Set
the
Pitch
Control
Volume
to
centre.
d)
Move
the
Tone
Arm
and
turn
the
power
on.
e)
Adjust
VR2
(30
kB)
until
the
strobe
comes
to
a
standstill.
5)
Quartz-Locked
Phase
Angle
Adjustment
(VR1)
a) Put the Quartz Switch to ON.
b) Set the Speed Selector to 45 rpm.
c)
Move
the
Tone
Arm
and
turn
on
the
power.
d)
Connect
CH-1
of
an
oscilloscope
to
TP1
and
CH-2
to
TP2.
e)
Adjust
VR1
(20
kB)
until
as
in
Fig.
26.
6)
Wow
and
Flutter
Confirmation
a) Put the Quartz Swtch 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 VR3, VR4 and VRS.