Heathkit SW-7800 - Synthesizer Board

Heat
Page
97
3.
Be
sure
to
touch
only
the
indicated
circuit
point.
To
do
otherwise
might
short
a
connec-
tion
and
damage
an
integrated
circuit
(IC)
or
transistor,
for
example.
:
Refer
to
Pictorial
7-4
(Illustration
Booklet,
Page
36)
for
the
following
steps.
(
4Turn
on
your
voltmeter
and
allow
it
to
warm
©)
Position
the
chassis
as
shown
in
the
Pictorial.
{A
Connect
the
line
cord
plug
to
a
120
VAC
out-
©
let.
Then
turn
the
VOLUME
control
on
the
Re
ceiver
clockwise
until
it
clicks
on.
Meter
lamp
PL1
should
light.
4
Tocate
the
18"
red
test
lead
you
prepared
ear-
lier.
Then
connect
the
alligator
clip
at
one
end
of
this
wire
to
TP201
(270
,
red-viol-brn).
Connect
the
other
end
of
this
wire
to
wire
socket
AF
(on
the
controller
circuit
board)
Connect
the
common
(negative)
lead
of
your
DC
voltmeter
to
the
GROUND
post
on
the
rear
panel
of
your
Receiver.
)
Touch
the
test probe
of
your
DC
voltmeter
to
:
vire
socket
AG.
g
La
Using
the
longer
alignment
tool,
adjust
coils
L202
and
L203
for
a
maximum
reading
on
your
aay
|
Use
the
longer
alignment
tool
lugs
in
coils
L202
and
L203
uni
ach
slug
is
even
with
the
top
of
t
SYNTHESIZER
BOARD
ALIGNMENT
4.
All
voltages
were
taken
with
a
vacuum-tube
voltmeter
(VTVM).
The
readings
that
you
get
should
be
within
+
20%
of
those
indicated
in
the
steps
voltmeter.
Repeat
this
step
until
you
notice
no
further
increase
in
the
meter
reading,
P201,
In
org-wht-
Disconnect
the
alligator
clip
from
stead,
connect
it
to
TP202
(390
0
brn).
)
Use
the
longer alignment
tool
to
rotate
the
core
in
each
of
the
following
coils
as necessary
until the
top
of
the
core
is
flush
with
the
top
of
the
coil
form.
Then
rotate
the
core
in
each
coil
clockwise
as
shown.
Use
the
flag
on
the
alignment
tool
to
count
the
rotations
of
the
tool,
1207
—1-1/2
tums
|
L208
—
2-1/2
turns
:
Touch
the
test
probe
of
your
DC
voltmeter
to
wire
socket
AG;
then
adjust
coils
L
L208
for
a
peak
(maximum) reading
on
your
voltmeter.
Repeat
this
step
until
you
notice
no
further
increase
in
the
meter reading
Disconnect
the
18”
red
test
lead
from
the
Re-
ceiver.
ae