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78
3.2.3.S. Barrel
&
pin cushion
distortion
(R812)
—
Set
TIME/cm
switch
SK2
to
1
ms
and
TIME/cm
potentiometer
R2
to
CAL
—
Set
AMPL
switch
SK17
to
10
mV/cm
and
AMPL
potentiometer
R4
to
CAL,
-
Depress
BEAM SELECTOR
switch
A
SK14
—
Set
AC-O-DC
switch
SK16
to
DC
—
Apply
a
sine-wave
signal
of
1
Vp.p, 2 kHz, to Y/\ input socket
BU3
Use an
insulated screw-driver.
Be
careful
not
to
make
any
short-circuits.
—
Check
that the displayed
vertical lines are straight.
If
necessary, readjust
potentiometer
R812
(Fig.
3.11.)
3.2.3.6.
Brightness
(R711, R801,
R802)
1500
V
Use
a well-insulated screw-driver to
protect
both
yourself
and
the
circuitry.
—
Switch
the instrument
on
at
least
15 m'mutes
before
starting this
check
—
Depress Y/^ switch
SK4,
+
switch
SK8,
AUTO
switch
SK10
and
BEAM SELECTOR
switch
A
SKI
—
Set
AC-O-DC
switch
SK16
to
0
"
Set
AMPL
switch
SK17
to
.1
V/cm
—
Set
INTENS
potentiometer
RIO
for
low
brightness
—
Set
TIME/cm
switch
SK2
to
1
ms
and
TIME/cm
potentiometer
R2
to
CAL
—
Check
that the time-base
line
shows
a
constant
brightness
over the
entire length;
if
necessary, readjust
potentiometer
R711
(Fig.
3.12.)
"
Check
that the brightness remains constant
in
all
other
positions of
TIME/cm
switch
SK2
—
Depress
AC
switch
SK1
—
Set
TIME/cm
switch
SK2
to
1
ms
—
Turn
INTENS
potentiometer
RIO
fully
clockwise
—
The
spot
must
just
be
visible;
if
necessary, readjust
potentiometer
R801
(Fig.
3.1
1.)
—
Depress
AUTO
switch
SK10
—
Set
INTENS
potentiometer
RIO
to
90°
from
itsleft-hand
stop
—
Check
that the time-base
line
Is
barely
visible;
if
necessary, readjust
potentiometer
R802
(Fig.
3.1
1.)
3.2.3.7.
Focus
correction
—
Depress
AUTO
switch
SK10
and
BEAM
SELECTOR
switches
A
SK14
and B
SKI
-
Set
AC-O-DC
switches
SK16
and
SK19
to
0
-
Set
AMPL
switches
SK17
and
SK18
to
.1
V/cm
and
AMPL
potentiometers
R4
and
R5
to
CAL
--
Shift
the time-base
lines
on
to the horizontal
central graticule
line
with
the
aid
of
POSITION
potentiometers
R11 and
R12
-
Rotate
FOCUS
potentiometer
R9
from
fully
anti-clockwise to
fully
clockwise
and check
that
this
does not
cause the time-base
linc>
to
shift
more
than 2
mm
3.2.4.
VERTICAL
AMPLIFIERS
3.2.4.1.
General information
The
adjustments
of the
vertical
amplifier
channels
Ya
and
Yb
are identical.
The
knobs, sockets
and
adjusting
elements of channel
Yb
are
shown
in
brackets
after
those of channel
Y^.
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