Heathkit RA-1 - Troubleshooting and Difficulty Solutions

hal
o
GAYS
TRO
it)
3
:
Connect
the
AC
voltmeter
across
the
speaker
terminals
with
the
speaker
connected.
Set
Receiver
scale
and
generator
to
1,7
Mc/s.
If
readings
do
not
coincide,
adjust
dial
cursor
on
cord.
Complete
each
step
as
indicated
in
the
following
chart.
Refer
to
Figure
7
for
the
location
of
each
coil
and
trim-
mercapacitor.
Besuretokeep
the
signal
generator
level
as
low
as
possible
while
still
obtaining
a
usable
read-
ing
of
the
meter,
this
should
be
just
above
th
i
ould be ju ¥
<a
BAND
SWITCH
SET
RECEIVER
AND
OSCILLATOR
ADJUST
MIXER
AND
RF
ADJUST
POSITION
GENERATOR
FREQ
TO:-
|
FOR
SIGNAL
FOR
MAX
OUTPUT
160
1.7
Mc/s
|
Ll
|
L7
and
L13
Metres
2.0
Mc/s
|
cl
C7
and
ANT
TRIM
80
3.5
Mc?s
L2
L8
and
Li4
Metres
4.0
Mc/s
G2
C8
and
ANT
TRIM
40
7.0
Mafs
C1g*
L9
and
L15
Metres
7.3
Mc/s
C3
C9
and
ANT
TRIM
20
14.0
Mc/s
C20%
L10
and
L1é
Metres
14.40
Me/s
c4
Cid
and
ANT
TRIM
|
15
21.0
Mefs
C21*
Lil
and
Ll?
Metres
21.5
Me/s
cs
Cli
and
ANT
TRIM
|
10
28.0
Mc/s
C22*
Ll2
and
L18
|
Metres
30.0
Mc/s
céb
|
C12
and
ANT
TRIM
Recheck
the
wiring,
Trace
each
lead
in
coloured
pencil
on
the
Pictorial
as
it
is
checked,
It
is
fre
ful
to
have
a
friend
check
your
work,
Someone
who
is
not
fatniliar
with
the
unit
may
notice
something
consis
-
tently
overlooked
by
the
constructor.
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
section
PROPER
SOLDERING
PROCEDURE
of
this
manual,
Gheck
to
be
sure
that
all
valves
are
in
their
proper
locations.
Make
sure
that
all
valves
light
up
properly.
Check
the
valves
with
a
valve
tester
or
by
substitution
of
valves
of
the
same
types
atid
known
to
be
good,
Check
the
values
of
the
parts.
Be
sure
that
the
proper
part
has
been
wired
into
the
circuit,
as
shown
in
the
Pictorial
Diagrams
and
as
called
up
in
the
wiring
instructions.
matter which may be lodged in the wiring.
re ends oro oreign
If,
after
careful
checks,
the
trouble
is
still
not
located
and
a
voltmeter
is
available,
check
voltage
readings
against
those
shown
on
the
Voltage
Chart.
NOTE:
All
voltage
readings
were
taken
with
a
20,
0002
per
volt
voltmeter. Voltages may vary as much as 10%.
8,
A
review
of
the
CIRCUIT
DESCRIPTION
will
prove
helpful
in
indicating
where
to
look
for
trouble.
Pree
L
DAYSTROM
LTD.
Jim
eA!