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Adjustments
b. Verify that
bright
dot does not appear on CRT.
c.
Connect oscilloscope to CRT storage
mesh
(white-yellow-violet
wire on
A5).
d. Note waveform similar to figure
5-3.
Set
write depth adj
A5Rl8B
for
pulse height
of approxi-
mately 9.5V p-p.
5-59.
FLOOD
GUN
AND
COLLIMATOR
AD-
JUSTMENTS.
5-60.
Reference.
Schematic
7,
table
5-1,
and
figure
5-4.
5-61.
Equipment.
None.
5-62.
Procedure.
a.
Set Model 1331A
controls as follows:
WRITE.
...............
..
................
in
INTENSITY
.
.
. . . .
. . . . . . . . . . .
.
. .
as required
PERSISTENCE.
. . . . . .
. .
.
.
.
. . .
.
.
. .
.
. . .
.
ccw
POSITION (HORIZ and VERT)....
centered
b.
Set collimator adj
A5Rl8D
to overcollimate;
that is, make
background illumination
smaller than
CRT viewing area and generally rectangular.
c. Set
flood
gun grid adj
A5Rl8C
for brightest
background
illumination
without dimming corners
or
edges.
d.
Set
collimator
adj
A5Rl8D to exact point
where
pattern
edge
just
touches graticule perimeter
(one or
more corners
may
extend beyond perimeter).
Ignore dimples at center top and
bottom
of graticule.
e.
Repeat steps a and
d several
times
to
obtain
greatest and most
uniform
brightness over entire
viewing area.
5-63.
WRITE
GUN
INTENSITY
LIMIT
ADJUST-
MENT.
6-04.
Reference.
Schematic
3,
table
5-1,
a
nd
figure
5-4.
6-fi.5_
Hquipment.
Digital voltmeter.
:)-(j(j_
Procedure.
5-8
a. Set
Model
1331A
controls
as
follows:
WRITE..................................
in
INTENSITY
____ . .
. .
. .
.
. . . . .
. . .
. .
10 o'clock
PERSISTENCE.
.
.
.
.
. .
.
. . . . . . .
.
.
.
.
.
. . .
.
ccw
POSITION (HORIZ
a
nd
VERT)
.. . .
centered
w,_,,..
&io-1
Model 1331A
WARNING
I
The write
gun
intensity limit
adjustment
is in
a
high
voltage
circuit
and must be ad-
justed with
an
insulated tool.
b. Set write gun intensity limit A3Rll fully cw.
Do not permit spot
to
bloom during fol-
lowing
adj ustments; CRT
damage may
result.
c.
Conn
ect
digital
voltmeter
to
junction
of
A3R23
and A3Cl2.
d. Set INTENSITY
for indication
of +7V on
digital
voltmeter.
e.
Observe
CRT.
Set write gun intensity limit
A3Rll to point where spot just becomes visible on
CRT;
then back down until
spot
just disappears.
5-67.
X-
AND Y-AXIS AMPLIFIER
GAIN AD-
JUSTMENT.
.i-fi8.
H.eference. Schematic
4,
table 5-1,
and
fig-
ure 5-4.
6-fi.9.
};quipment.
Square wave
generator.
.i-70.
Procedure.
a.
Set Model 1331A
controls
as
follows:
WRITE...
..................
.............
in
INTENSITY.......
..........
...
as required
PERSISTENCE....................
....
ccw
POSITION
(HORIZ and
VERT) . . . .
centered
b
.
. Apply
1-kHz,
i
V
p-p square
wave from square
wave
generator to
X
INPUT.
c.
Set
horiz
gain A5R71 for
exactly
10
div
hori-
zonta
l
deflection on
CRT.
d. Move output of
square
wave
generator
to
Y
INPUT.
e. Set vert gain A5R38 for
exactly
8 div vertical
deflection on CRT.
5-71.
PHASE SHIFT ADJUSTMENT.
6-7:2.
H.eference. Schematic 4, table
5-1, and
fig-
ure
5-4.
)
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