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5
a
Fig. 4-2.
Location of —100 V test point.
2. Adjust CRT Grid Bias
a. Connect
the DC Voltmeter between
pin 5 and pin 2
of
plug
P3
(negative
meter
lead to pin 2) on the Power
Supply Board (A-3). See Fig. 4-1.
b. Turn the INTENSITY control fully clockwise.
c. CHECK—Meter
reading of +1.9 volts.
d. ADJUST—CRT Grid Bias adjustment, R273, for a
meter reading of +1.9 volts.
e. Disconnect
meter
leads. Turn
the
INTENSITY
con-
trol fully counterclockwise.
3. Adjust FOCUS
a. Turn the CH 2 POS control to midrange and the CH 1
POS control to the OFF detent.
b. Set
the
SEC/DIV
switch
to
X-Y
and
adjust
the
INTENSITY control for a nominal display intensity.
c. ADJUST—FOCUS,
R398
(located
on
the
214
side
panel) for a well-defined dot.
4. Adjust Trace Rotation
a. Set the SEC/DIV
switch to 1 m.
Calibration—214 Service
b.
Position
the trace to the center horizontal graticule
line.
c. CHECK—Free-running
sweep
is
parallel
with
the
horizontal graticule line.
d.
ADJUST—Trace
Rotation
adjustment,
R141
(see
Fig. 4-3)
to align
the
sweep with the center horizontal
graticule line.
I
SIDE PANEL »
TRACE
ROTATION
R141
Ni
AMPLIFIER
Fig. 4-3.
Location of Trace Rotation adjustment.
5. Adjust Storage Operating Level
a. Determine the upper writing limit of the CRT.
(1)
Turn
the
CH 1
POS
control
to
midrange
and
vertically position the two traces within the center four
graticule divisions.
(2)
Set
the
SEC/DIV
switch
to
5m
and
turn
the
INTENSITY control fully clockwise.
(3) PRESET—Operating
Level adjustment,
R510
(see
Fig. 4-4) fully counterclockwise.
(4) Connect the DC Voltmeter between pin 4 of piug
22 and
ground
(negative
meter
lead to ground) on the
Power Supply (A-3) board. See Fig. 4-4.
(5) Depress the SINGLE SWP button and the STORE
button.
(6) Press the ERASE button.
(7) Press the RESET button.
4-5
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