Heathkit SW-7800 - Page 10

Page
98
Heathkit
CONTROLLER
BOARD
ALIGNMEN'
Refer
to
Pictorial
7-4
(Illustration
Booklet,
Page
36)
(_)_Unsolder
and
remove
the
cover
from
the
con-
for
the
following
steps.
troller circuit
board
shield,
if
it
is
installed
()
Temporarily
remove
the
small
jumper
wire
()
Turn
the
Receiver
on,
connected between
wire
sockets
D
and
E
(on
the
synthesizer circuit
board),
NOTE:
When
a
step
directs
you
to
set
the
BAND
switch
to
a
particular
frequency,
you
can
use
the
first
(leftmost)
digits
of
the display
to
determine
when
you
have
the
switch
set
correctly
(_
)
Be
sure
the
wire
coming
from
synthesizer
cir-
cuit
board
hole
AA
is
plugged
into
wire
socket
K.
Connect
the
alligator
clip
at
one
end of
the
18"
red
test
lead
to
TP302.
Connect
the other
end
of
this
wire
to
wire
socket
E
(on
the
syn-
thesizer
circuit
board).
}
Set
the
BAND
switch
to
29
(MHz).
‘ouch
the
test
probe
of
your
DC
voltmeter
to
TP301.
Then
adjust
coil
L301
until
your
volt:
meter
reads
7.0
volts.
Diode D201
(Unlock
LED
—
on
the
synthesizer
circuit
board)
should
not
(_)
Turn
the
Receiver
on.
be
lit
(
Turn
the
tuning
knob until
tuning capacitor
)
Set
the
BAND
switch
to
8
(MHz).
Then,
wit!
C3
is
half
meshed
(half
closed)
as
shown
in
the test
probe
of
your
DC
voltmeter
touchin
the
inset
drawing
#2
on
the
Pictorial.
Then,
‘'TP301,
adjust
trimmer
capacitor
C316
unt
using
the
longer
alignment
tool,
adjust
coil
your
volimeter
reads
1.5
volts
L306
until
the
display
reads
between
6.035
and
6.055,
)
Set
the
BAND
switch
to
0
(MHz).
Then
adjy
trimmer
capacitor
C314
until
your
voltmet
(Turn
the
Receiver
off.
reads
1.5
volts.
()
Disconnect
the
red
test
lead
from
the
control-
)
Turn
the
Receiver
off.
ler
and
synthesizer
circuit
boards.
)
Disconnect
the
voltmeter
test
leads
from
yo
(}
Disconnect the
wire
installed
in
wire
socket
Receiver.
K
(on
the
synthesizer
circuit board)
)
Refer
to
inset
drawing
#1
on
the
Pictorial
at
()
Reinstall the small
jumper
wire
between
wire
install
the
cover
on
the
controller
circuit
boat
sockets
D
and
E
(on
the
synthesizer
circuit
board),
shields.
Push
down
on
the
shield
before
yo
solder
the
cover
to
the
shields
in
the
tw
places
shown.
Page
7
of
10
SW-7800/595-3052
591-4547