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General
Troubleshooting Information
NOTE: The following checks will
be
most effective if
you
apply them to one
part
of the kit at a time.
1,. Recheck the
wiring. Trace
each
lead in colored
pencil
on the Pictorial as it is checked. It is
frequently helpful to have a friend check
your
work. Someone
who is
not
familiar
with
the
unit
may notice something
you
have
consistently
overlooked.
2. About
90%
of the kits that are
returned
for repair
do not function
properly
due to
poor
connec-
tions
and
soldering.
Therefore,
many troubles
can
be
eliminated
by a
careful
inspection
of
connections
to make
sure
they are
soldered as
described in the
"Soldering"
information
at the
beginning of the Assembly manual. Reheat
any
doubtful connections. Be sure all wires are sol-
dered at
places
where several wires are
con-
nected.
3.
Check each circuit
board foil to be sure there are
no solder bridges between adjacent connec-
tions.
Remove
any solder bridges by holding
a
clean soldering iron tip between the two
points
that are bridged until the excess solder flows
down onto the tip
of the soldering iron.
Check each
resistor value
carefully.
A resistor
that is discolored,
or
cracked,
or
shows any sign
of
bulging would indicate that it is faulty and
should be
replaced.
4.
5.
6.
7.
Be
sure each diode
is
installed with the banded
end
positioned
correctly.
Check all component leads
connected to the cir-
cuit boards. Make sure the leads
do not
extend
through the
circuit board
and come in contact
with
other connections or
parts.
The
components listed
in the
"Possible
Cause"
column of the
"Troubleshooting
Chart" are the
most likely
causes
(but
not necessarily
the only
causes) of a
problem.
When
you
check these
components, look first
for the following items:
Parts installed
incorrectly
or backwards.
This
pertains
especially to diodes,
elec-
trolytic
and tantalum capacitors,
and trans-
istors.
Unsoldered
or
inadequately
soldered
parts.
Reheat
the connections in the area of a
problem.
Incorrect
or
interchanged parts.
Check the
part
numbers
on the diodes and
transistors.
NOTE: In
an extreme case where
you
are unable to
resolve
a difficulty, refer to the
"Customer
Service"
information inside
the
rear
cover
of
the Manual. Your
"Warranty"
is
located inside the front cover.
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