NAD 5420 - Focus and Tracking Gain Adjustment Guidance

FOCUS/ TRACKING GAIN ADJUSTMENT
NOTE: It is recommended that these adjustment are 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 3
optical
blocks
two
axis
device
and
its
sensitivity
to
mechanical
shock.
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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.
*x When the gain is too low,the susceptibility to mechanical shock and
skipping will be poor.
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Time taken from stop to play is excessive, or
track skip time is excessive.
(normally approx. 2 sec)
Music does not start when play 1s pressed or
track selection is made but disc rotates.
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Intermittent sound during play or counter.
stops.
High mechanical noise from optical block
during play.
low or high low or high
TOW
low or high
low
high high
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