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Heathkit IM-4100 - Page 44

Heathkit IM-4100
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Page
38
os
=)
HEATHEKITS
INITIAL
TESTS
WARNING:
When
the
line
cord
is
connected
to
an
AC
outlet,
line
voltage
is
present
at
several
places
in
your
Frequency
Counter.
Be
careful
that
you
do
not
contact
this
voltage
or
an
electrical
shock
will
result.
See
‘Circuit
Board
X-Ray
Views”
on
Page
51.
Refer
to
Figure
2
in
the
Illustration
Booklet
to
identify
the
test
points
for
the
following
steps.
(
4
Solder
a
10”
length
of
remaining
wire
to
one
end
of
the
1000
Q
(brown-black-red)
resistor.
This
is
the
test
probe
for
the
following
steps.
(Sd
Insert
the
other
lead
of
this
resistor
into
the
indicated
wire
connector
as
shown.
NOTE:
If
you
do
not
obtain
the
proper
results
in
any
of
the
following
steps,
unplug
the
line
cord
and
proceed
to
the
“Initial
Test
Difficulties.”
If
you
cannot
solve
the
problem,
proceed
to
“In
Case
of
Difficulty”’
on
Page
44.
(50.
Set
the
four
switches
as
follows:
OSCILLATOR
INT
POWER/TIME
BASE
POWER
OFF
MODE
FREQ
INPUT
ATTEN
10
(~)
Plug
the
line
cord
into
the
AC
outlet.
CAL
Set
the
POWER/TIME
BASE
switch
to
kHz.
Some
segments
of
the
LED
displays
should
light.
The
GATE
lamp
should
be
off.
NOTE:
During
the
following
tests,
disregard
the
random
numbers
that
may
be
displayed.
Touch
the
test
probe
to
the
following
test
points
(TP)
and
observe
the
GATE
lamp.
(INCHES) 2
3
OF
6.
45
emis
2
3
4
5 6
7
8
TEST
POINT
GATE
LAMP
[es
1
on
\AT-
2
blinks
(0
3
on
ae)
3
Hold
reset
button
in.
off
Od)
4
Hold
reset
button
in.
off
Pg
ee:
blinks
Ay.
6
blinks
Min
off
Oa
7
Hold
reset
button
in.
on
Of
Turn
the
unit
off
and
unsolder
the
test
probe
wire
from
the
resistor.
()
R26:
Cut
the
resistor
leads
to
3/8”,
bend
the
leads
as
—
necessary,
and
insert
the
ends
into
the
wire
connectors
as
shown
in
the
inset
drawing.
me
Connect
a
test
cable
to
the
INPUT
connector.
If
you
do
not
have
a
test
cable,
proceed
to
“’Final
Assembly.”
(
)
Position
the
MODE
switch
to
FREQ,
and
the
POWER/TIME
BASE
switch
to
kHz.
>
(_
)
Connect
the
signal
lead
of
the
test
cable
to
test
point
8.
Leave
the
other
test
cable
lead
disconnected.
Notice
that
the
OVERRANGE
indicator
is
lit.
The
GATE
lamp
is
flashing.
( )
Position
the
MODE
switch
to
TOL.
(_
)
Connect
the
test
cable
signal
lead
to
test
point
9.
Then
push
and
release
the
RESET
button.
The
Counter
should
start
at
zero
and
add
up
the
incoming
pulses
at
the
rate
of
10
pulses
per
second.
(_
)
Position
the
MODE
switch
to
FREQ.
The
display
should
be
.010
or
.011
and
the
GATE
lamp
should
flash
once
each
second.
(_
)
Disconnect
the
test
cable.
This
completes
the
“Initial
Tests.’
Proceed
to
‘Final
Assembly.”