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Denon DP-80 - Page 4

Denon DP-80
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ADJUSTMENT
1.
Adjustment
of
head
gap
Loosen
the
two
fixing
screws
and
adjust
the
gap
between
the
magnetic
coating
surface
of
turntable
platter
and
the
head
surface
to
be
approx.
0.2mm.
Note:
Variation
of
this
gap
causes
variation
of
stopping
condition
of
the
platter.
Avoid
adjustment
of
head
position
if
it
is
not
absolutely
necessary.
2.
Confirming
regulator
voltage
An
IC
is
employed
for
regulating
voltage,
allowing
no
fine
adjustment.
Confirm
this
regulated
voltage
is
5V.
+
—60%
3.
Adjustment
of
speed
(KU-264)
3-1
Connect
a
dual
trace
oscilloscope
to
TP-1
on
KU-264
P.
W.
board.
|
3-2
Set
the
phase
lock
button
to
NORMAL
(locked)
and
obtain
45rpm
rotation
first.
Adjust
VR
2
so
that
the
sampling
pulse
comes
at
60%
position
from
starting
edge
of
the
saw
tooth
waveform.
(See
below.)
3-3
Change
over
to
33rpm
and
adjust
VR
1
to
bring
the
pulse
at
60%
position
in
the
same
manner.
Note:
If
a
single
trace
oscilloscop
is
used
for
adjust-
ment,
connect
the
ground
terminal
of
the
oscillo-
scope
to
the
sampling
waveform
output
of
TP-1
instead
of
connecting
to
ground
terminal
thereof.
Duplexed
waveform
can
be
observed.
ea

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