Heathkit IM-16 - Chassis Photographs

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IN CASE
OF
DIFFICULTY
This section
of
the
Manual
is divided
into two
parts.
The
first
part,
titled General Trouble-
shooting
Information, describes
what
to
do
about
any
difficulties that may
occur
right after the
Voltmeter is assembled.
The
second
part,
a
Troubleshooting Chart,
is
provided
to assist in servicing if
the
General
information
does not
clear
up the
problem,
or
if
difficulties
oecur
after
the Voltmeter
has been
in operation
for
some
time.
This Chart
lists a
number
of
possible
difficulties
that
could
arise,
and
lists
several
possible
causes.
Before
starting
any
troubleshooting
procedure,
try
to narrow
the
problem down
to a specific
area
by
trying
the various
functions
of
the instru-
ment.
GENERAL
TROUBLESHOOTING INFORMATION
The following
paragraphs deal with the types
of
difficulties
that
may show up right
after a kit
is
assembled. These
difficulties
are most
likelyto
be caused
by
assembly
errors
or faulty solder-
ing.
These
checks will help
you
locateanyerror
of
this
type
that might have
been
made.
1.
Recheck the
wiring.
Itmaybehelpfultohave
a
friend check
your
work. Someone
who
is
not
familiar with
the
unit
may notice
some-
thing
consistently
overlooked
by
the
builder.
2. About
90Vo of.
the
kits that are
returned for
repair do not
function
properly
due
to
poor
connections and
soldering.
Therefore,
many
troubles
can be eliminated
by reheating
all
connections to make
sure
that
they
are
soldered as described
in
the
solderingsec-
tion
of
the Kit Brlilders
Guide.
3"
Check
the values
of
the
parts.
Be
sure
tlat
the
proper
part
has been wired
into the
cir-
cuit,
as
shown in
the
Pictorial
diagrams and
as
called out
in the wiring instructions.
Pay
special
attention to
resistor values, since
there
are many
resistors
of
similar
value,
and they are
easily interchanged.
4,
Check
for
bits
of
solder,
wire
ends,
orother
foreign
matter
which
may
be lodged in the
wiring.
5"
Check
for solder
bridges
between circuit
board
foils.
6. ff, after
careful checks,
the trouble
is
still
not
located,
and another
voltmeter
is
avail-
able,
check voltage readings in the
circuits
of
your
Voltmeter
against those
shown on
t}re
Voltage
Chart
(fold-out
from
Page
40) and
Schematic. NOTE:
All
voltage readings
were taken with an
11
megohm input volt-
meter. Voltages may
vary
asmuchas*1070.
7.
A
review
of
the Circuit
DescriptiononPage
34, and a
study of
the Schematic
(fold-out
from
Page
43 will also help
you
locate a
difficulty in the
Voltmeter. Refer to
the
X-
Ray
view
of
the
circuit board on
(fold-out
from
Page
40)
to
help
locate
parts.
NOTE:
In
an
extreme case
where
youareunable
to
resolve
a
difficulty, refer
to the Service and
Warranty
section of
the
"Kit
Builders Guide",
and to the
rrFactory
Repair Service" information
on
Page
3? of
this
Manual.