Adjustments—
T91
2
p
ADJUST—
R934
(see
Fig. 4-2),
Storage
Level, as
necessary, for no
breaks
and
maximum
contrast over
center
eight divisions, while
storing
and
erasing
single
sweeps.
q.
Disconnect test
equipment.
flooded edges begin to
pull inward.
Record
the
voltmeter
reading
obtained
with this setting of R934.
g.
Add the
meter
readings obtained in parts
e and f;
divide
the sum by 2
and
reset R934 for a
meter
reading
equal to this result.
5B.
STORAGE (SN
B010300-up)
Vertical Mode CH
1
(button in)
CH 1 AC-GND-DC DC
CH
1 VOLTS/DIV .1 V
SEC/DIV ,5
m
STORE
Store
(button in)
SOURCE
INT
MODE
SINGLE SWP
ENHANCE LEVEL
fully ccw
INTENSITY fully
ccw
NOTE
Storage
adjustments
should be
made
in low
ambient
lighting
conditions or while
using a
viewing
hood.
h.
ADJUST—
R957,
Collimation
1:
press and
hold
ERASE in,
while adjusting R957
fully ccw—
then
cw
until
the
brightly flooded
area
most
completely fills the
graticule confines.
i. ADJUST—
R954,
Collimation
2;
continue to
hold
ERASE in,
while
adjusting R954
fully
ccw, then
slightly cw
for
the most uniform,
brightly-flooded
area that most
completely
fills the
graticule confines.
j.
INTERACTION—
R984,
R934, R957,
and R954.
Repeat
parts
c through i to
achieve
a
display in part i
with
most
uniform
flooding
of graticule area
(uniform
brightness,
no
dark corners
and
uniform edges).
Disconnect
volt-meter leads
from oscilloscope.
k. Connect a
bnc
50 O cable to the
sine-wave
generator
and
terminate
the cable with a
bnc 50 O
termination
attached
to the CH
1 input (see
Fig.
4-3).
b. Refer to
Fig.
4-2
for
location of
adjustments
in the
remainder of
this step
If
storage
circuitry has had major
repairs or if
misadjustment
of controls
is suspected,
pre-
set R984,
R934, R957,
and
R954 (also
R930 for SN
B01 1467-up) to
mid-range;
otherwise, leave
them
as
previously
set
and
proceed
with
part c.
I.
Set: MODE
STORE
INTENSITY
FOCUS
AUTO
Button out
For visible
display
For
well-focused
trace
c.
ADJUST—R984,
Flood
Gun
Bias: press and
hold
ERASE
button
in; adjust
R984 until
graticule
display area
is flooded
and
corner shadows
just
disappear.
Release
ERASE
button.
d. Set
voltmeter to 200 V range,
and connect
negative
lead
to
ground at pin 1
of
P470 on Interface
board (this is a
two-pin plug, marked
P9
on
some
boards). Connect
positive
lead
to
anode
of
CR945
on
Storage
board.
e. ADJUST—
R934,
Store Level,
fully ccw,
then
advance
it cw until screen abruptly begins to
illuminate. Record
the
meter
reading
for this point to
refer to in
part
g.
f. Advance R934 setting further
cw
until screen is
abruptly brightly flooded and one
or
more edges of
the
brightly flooded portion begin to pull inward;
back
off the
R934 setting slightly ccw to a point
just before
the brightly
m.
Set
generator for a
4-division, 2 kHz
display
(add
attenuators, and set
VOLTS/DIV or
VAR VOLTS/DIV as
necessary for a
4 division
display.
n. Set:
MODE
SINGLE
SWP
STORE
Button
in
o. Press
ERASE,
then
release, press MODE to
RESET,
then
release to
SINGLE SWP; repeat
this
sequence and re-
adjust R934
if necessary,
while checking for a stored
waveform
with
minimum or no
breaks, good
contrast,
and
minimum
background
illumination (fade-up),
for a period
of 1
minute.
p.
Repeat part I. Set
generator
for a 20 kHz,
4-division
display (SEC/DIV to 50;/).
Repeat part n,
then
perform part
o
while
adjusting ENHANCE
LEVEL
cw
to obtain an
4-6
BEV.
A APR 1977
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