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Dartboard
mis-scoring
Press in turn, and taking noteof
time, the segments:
If any of these numbers fa,il
are bad, add
these
switch
contacts
this sum total of missing scores.
ceedure to confirm that a missing score is not caused by an under-
sensitive switch on one of those segments
closed contact on one of the switches will prevent any of those
lines to which it is connected from being recognized. Assume that
the single 9 switch is sufficiently out of adjustment such that
it is always closed.
Adopting
the
proceedure
double 16 segments are pressed, only, in this case, the
and "32" will be shown.
a segment with a score of 9 is causing trouble.
A number of the segment switches are tied together where their
scores are the same.
linking is done on the matrix board.
adopted
in
following
case there may be more than one switch tied to that line.
Returning
to
it could be either of the two single 9 segment switches or the triple
3 segment switches.
fault.
Obtaining
correct
the
possibility
The next stage of the elimination process is to press each
segment in turn to check that they are neither supersensitive, in
which case the blades of the switches should be eased apart, nor
undersensitive,
a
segment
If
cleaning the contacts with a paper towel moistened with a mild
solvent should be tried.
If one of the encoding diodes in the 'wrap-around' matrix board
has
open
become
missing.
Again
diode to the 2 line is open circuit the score will be encoded
the
at 1,4 and 8 giving 13.
singles
missing
numbers
(for
permanently
This will tie down the 8 and the 1 line.
outlined
The 8 and 1 are missing indicating that
Typically triple 3 is tied to single 9.
the
checkout
the
example
given,
Careful
examination
indications
of
permanently
closed
in which case the blades should be moved closer.
fails
to
score
circuit then its component of the score wiil be
an
example:
single
the recorded score at each
and double 16.
to record,note the ones which
together
and
made
contacts)
(It is best to repeat this pro-
above
whereby
the
Care should therefore be
proceedure
outlined
with an 8 and a 1 missing
will
rapidly
of
switches.
even
with
the
contacts
15
comprises
investigate
those
A
permanently
and
This
above
in
identify
the
and 32 will eliminate
closing
then
I f
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