Tandy CM-4 User Manual

9.
Black
and
White
Tracking
1
.
Turn
the
screen
control
fully
clockwise.
Turn
the
red,
green
and
blue
bias
controls fully
clockwise.
Set
the
brightness
control
and
the
red
and
blue
drive controls
at the
center
positions.
2. Operate the
computer
in such a way
that
the
en-
tire screen
is
high
intensity
white
(display
period:
44.698
fiS
horizontal, 14.33
mS vertical).
3. Turn off the
switch SW851
.
4. Rotate the
screen control
counterclockwise
until
a
raster
(either
the
red, green or
blue)
appears
dimly
on
the
screen.
5.
Rotate two
of
the three
bias
controls
counterclock-
wise
until the raster becomes
whitish:
position
ro-
tated
controls
must
be
the
ones
which
control
the
colors
other than
the raster's
colors.
Notes: Adjust R863
and
R864
if
the red
appears.
Adjust R862
and
R864
if
the
green
appears.
Adjust
R862
and
R863 if
the
blue
appears.
6.
Return
switch SW851
to
its
original
position.
7.
Rotate
the
red and
blue
drive
controls
until
the
raster
is white.
8. Set the
brightness
control
at its
maximum
position
and
adjust
the screen
control
until
a
reading
of
3.8V
DC appears
between
TP-402
and
TP-403
(at
both
ends
of R407).
9.
Turn
the
brightness
control in
either
direction
to
check
that
the picture
maintains
a
good
white
balance.
10.
Repeat
steps
3 thru
9 for
readjustment.
10.
Static (Center)
Convergence
(Figs.
13-16)
1.
Switch
the
display monitor
ON
and
allow
it
to
warm
up
15
minutes.
2.
Operate
the computer in
such
a way
that the
en-
tire
screen
is
a
Crosshatch
pattern (display
period:
44.698
fiS
horizontal,
14.33
mS vertical)
on the
center
of
the
CRT screen.
(Fig.
14)
Proceed
as
follows:
a.
Locate the
pair
of
four-pole
magnet
rings.
Ro-
tate
the individual
rings
(change
spacing
be-
tween
tabs)
to
converge
the
vertical
red
and
blue lines.
Rotate
the
pair
of
rings
(maintaining
spacing
between
tabs) to
converge
the
horizon-
tal
red and
blue
lines.
Refer to
Figure
15.
b.
After
completing
red and
blue
center
conver-
gence,
locate the
pair of
six-pole
magnet
rings.
Rotate
the
individual
rings
(change
spacing
be-
tween
tabs)
to
converge
the
vertical
red
and
blue
(magenta)
and
green lines.
Rotate
the
pair
of rings
(maintaining
spacing
between
tabs)
to
converge
the
horizontal
red
and
blue
(magenta)
and
green lines.
Refer
to
Figure
16.
BLUE<^j
\-
4
RED
Figure 15
""iii
—
i
—
i
—
i
—
i
—
|
—
I
—
i
—
i
—
i
—
i ii
Horizontal:
12 Lines
Min.
Vertical:
16 Lines Min.
BLUE/-*!
Figure
14. Crosshatch
Pattern
t
GREEN
Figure 16.
Static
(Center)
Convergence
4
16

Tandy CM-4 Specifications

General

Brand	Tandy
Model	CM-4
Category	Monitor
Language	English