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Akai AP-Q55

Akai AP-Q55
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2.
MODEL
AP-Q55/C
eee
.
pho.
MS
RI,2Z0UARTZ
1)
X’tal
Oscillation
Frequency
Adjustment
(VC1)
a)
Connect
a
frequency
counter
to
TP1
and
P6-
@
(GND).
b)
Move
the
Tone
Arm
and
turn
the
power
on.
c)
Adjust
VC1
(15P)
to
give
a
frequency
counter
reading
of
5.4
MHz
+
10
Hz.
2)
Off-set
voltage
Adjustment
(VR5,
VR6)
and
Torque
Difference
Adjustment
(VR7)
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
(J1).
Adjust
VRS
(20
kB)
until
it
reads
-110
mV
DC.
e)
Put
the
Tone
Arm
on
the
Arm
Rest
(Power
is
OFF).
f)
Short
connector
(J1)
pins
©,
@
and
®).
g)
Set
VR7
(200
kB)
to
the
center.
h)
Move
the
Tone
Arm
and
turn
on
the
power.
piers
~
LOCK
‘PHA:
Fig.
15
Quartz
Servo
P.C
Board
APQ-5506A
i)
Connect
an
oscilloscope
to
pin
@)
terminal
of
connector
(J1)
and
adjust
VR6
(20kB)
until
it
reads
~110
mV
DC.
j)
Put
the
Tone
Arm
on
the
Arn
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
VR7
(200
kB)
until
the
vdtage
is
the
same
at
both
G)
and
@)
terminals
of
connector
(J1).
3)
Speed
Adjustment
(VR3)
a)
Put
the
Quartz
Switch
to
OFF.
b)
Set the
Speed
Selector
to
33-1/3
rpn.
c)
Set the
Pitch
Control
Volume
to
cester.
d)
Move
the
Tone
Arm
and
turn
the
paver
on.
e)
Adjust
VR3
(30
kB)
until
the
strobecomes
to
a
standstill.
24

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