NAD 512 - Focus and Tracking Gain Adjustment Guidance; Gain Adjustment Troubleshooting

GUIDANCE
ON
FOCUS
AND
TRACKING
GAIN
ADJUSTMENT
NOTE:
It
is
recommended
that
this
adjustment
is
not
carried
out
unless
absolutely
necessary.
A
frequency
response
analyzer
is
necessary
to
carry
out
this
adjustment
precisely.
However
this
adjustment
has
a
wide
tolerance
so
that
even
if
the
adjustment
has
not
been
performed
exactly
the
player
will
still
work
with
an
acceptable
level
of
performance.
The
focus
and
tracking
gain
determine
not
only
the
vertical
and
horizontal
tracking
characteristics,
but
also
the
amount
of
mechanical
noise
from
the
optical
blocks
two
axis
device
and
its
sensitivity
to
mechanical
shock.
Correct
adjustment
will
be
at
the
point
where
all
the
above
criteria
are
satisfied.
*
When
the
gain
is
too
high,
the
mechanical
noise
is
high.
*
When
the
gain
is
too
low,
the
susceptibility
to
mechanical
shock
and
skipping
will
be
poor.
GAIN
SYMPTOM
Time
taken
from
stop
to
play
is
excessive,
or
track
skip
2
time
is
excessive.
(normally
approx.
2
sec)
low
or
high
low
or
high
Music
does
not
start
when
play
is
pressed
or
track
selec-
tion is made but disc rotates.
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