Instruction manual
y
To find
the
"Y"
size of the
pattern
fill
in
the blanks
arithmetic.
Mfr
spec'd sens.
("B"
above)
Using
the
monitor
Y size adjust the
"Y"
line on the
the
"Y
determined above.
E)
Set
the
Model 241
to
(:;:;:3
(Diagonal Crosshatch I and
note
that
the
pattern
square on
the
screen and
that
its overall size
is
the
same
"X"
and
"Y"
from
C)
and
D)
above.
of
an X-Y monitor,
the
Model 241 has
This
pattern
is
a calibrated brightness
by
the
BRIGHTNESS control. The
pattern
()f
1 volt step
in
the
R,G and B
output
signals
with
"black"
(+lV)
and in 1 volt steps
to
The
manufacturer's literature should be consulted
to
be sure
this signal
is
suitable for
the
monitor
being serviced, however, at this writing
all known monitors
this
standard. '
Normal procedure
is
to
set
the
drive controls
at
the
center
of
their rota-
the
cutoff
and
common
screen control
to
minimum.
Turn
up
the
com-
mon screen until
the
left hand (black) bar
is
just visible
then
back
off
until
the
bar
is
black, The
cutoff
control
of
whatever color appeared
in
the
black
is
left
at
minimum. Next
turn
up
the
other
two
cutoff
controls
similar
to
what
was
done
with
the
common
screen control. Finally adjust
the
dnve
controls for neutral white
on
the
"white"
(right hand) bar.
-21-
SECTION VI
GENERAL CONVERGENCE PROCEDURE
(RASTER SCAN AND
x-v
MONITORS)
GENERAL
Due
to
the
magnetic sensitivity
of
color monitors,
it
is
desirable
color and alignment adjustments at
the
site
of
the
permanent
receiver.
The
light weight and portability of
the
Model
241
lends
ticularly
to
"on
location"
use although it may also be used in
the
usually desirable
to
give
the
receiver a final touch-up at
tion, if
it
has been serviced elsewhere.
The service technician
who
establishes routine
saves himself a great deal
of
work and time.
He
leads. Frequently a slight
is
all
that
sequence
of
procedure
is
recommended.
DEGAUSSING
To
remove unwanted stray
at
the
beginning
of
all testing
or
To
do
this, place
on
the
floor
about
ten
feet
in
front
of
the
monitor.
to
the
level of
the
monitor
and hold
it
in
a plane parallel
TV
tube. Move
the
coil
to
within a
of
inches
of
the
maintaining
the
parallel plane between coil and
tube.
In
a
motion,
pass
the
coil over
the
face
of
the
tube
a half dozen times.
In
similar manner
move
the
coil around
the
top
and
(if
the
bottom
of
the
monitor, always maintaining
the
of
the
coil parallel
to
the
top,
sides,
and
bottom.
Return
the
coil
to
the
face
of
the
monitor
for
measure, pass
the
coil over
the
face
of
the
tube
a few times.
Maintaining
the
parallel move
the
coil away from
tube a distance
of
about
ten
feet.
Turn
the
coil
90
tube
and de-energize
the
coil.
COLOR
PURITY
The purpose
of
purity
is
to
compensate for
may exist between
the
position
of
the
three electronic gun
center
of
deflection
of
the
tri-color picture
tube.
The direction
of
displacement
of
the
beams
is
controlled
the
purity
magnet, while
the
amount
of
displacement
strength
of
the
field. It might
be
convenient
-22-
the
the