Page
89
Heathkif
IN
CASE
OF
DIFFICULTY
Begin your
search for
any
trouble that occurs after
assembly
by carefully following the steps listed
below in the
"Visual Checks." After
you
complete
the "Visual Checks," refer to the
Troubleshooting
Charts.
NOTE: Refer
to
the
"Circuit Board X-Ray
Views" (II-
lustration Booklet, Page
37)
for
the physical location
of parts on the
circuit boards.
VISUAL
CHECKS
2.
3
Recheck
the
wiring.
Trace
each lead
with a
colored
pencil on
the
Pictorial as
you
check
it.
It is
frequently
helpful
to
have a
friend
check
your
work.
Someone
who is
not
famil-
iar
with the
unit may
notice
something
that
you
have
consistently
overlooked.
About 90%
of
the kits
that
are
returned to
the
Heath
Company
for
repair do
not
function
properly
due to
poor
connections
and
solder-
ing.
Therefore,
you
can
eliminate
many
troubles by
reheating
all
connections
to
make
sure they
are
soldered
as
described
in
the
"Soldering"
section
of
the
"Assembly
Notes"
on
Page 6.
Be
sure
there
are
no
solder
"bridges"
between
circuit
board
foils.
Check to
be
sure all
transistors
and
diodes are
in
their
proper
locations.
Make
sure
each lead
is
connected
to
the
proper
point.
Make
sure
each
diode
band is
positioned
above
the
band
printed
on
the
circuit
board.
4
5
6
7
8
Check electrolytic capacitors to be sure their
positive
(
+
) mark is at the correct position.
Check to be sure
each IC is properly installed
in its socket, and the pins are not
bent
out
or under the IC. Also be sure
the IC's are in-
stalled
in their correct positions.
Check the values of the parts. Be
sure in each
step that you
wired the correct part into the
circuit, as shown in the Pictorial. It would be
easy, for example, to
install
a 68
kft (blue-
gray-orange) resistor where a 6800 ft (blue-
gray-red) resistor should be installed.
Check for bits of solder, wire ends, or other
foreign
matter
which
may be lodged in
the
wiring.
A review of the "Circuit Description" may
also help you determine where the trouble is.
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