Section
V
Paragraphs 5-6 to 5-21
e.
Deflection should be 10 cm
*
0.1 cm.
f.
Repeat steps
a
through
e,
using
0.5
V/CM ver-
tical SENSITIVITY and 10 volts from the Voltmeter
Calibrator.
5-6.
ADJUSTMENTS.
5-7. The adjustment procedures for the Model 141A
are
given in Paragraphs 5-11 through 5-22. Test
equipment requiredis listedin Table 5-1. Similar test
equipment having the requiredcharacteristics may be
substituted for that recommended in the table.
If
difficulty
is
encountered in making any adjustment,
refer
to Paragraph 5-23 for
troubleshootingprocedures.
5-8. PRELIMINARY SETUP. Plug-ins shouldbe in-
stalled in both compartments whenpower supply ad-
justments are made; proper regulation may not occur
with no current load connected.
All internal adjustment components
are
identified in
Figure
5-1.
Table 5-3
is
a
condensed adjustment procedure. The
table may be useful after becoming familiar with the
step-by-step procedures.
5-11.
ADJUSTMENTS
OF
LOW-VOLTAGE SUPPLY.
5-12. Measure the output of each low-voltage supply,
and adjust
it
to the value shown in Table 5-2.
Mea-
surement may be made on any wire bearing the indi-
cated color code.
5-9. ADJUSTMENT COMPONENT IDENTIFICATION.
5-10. CONDENSED ADJUSTMENT PROCEDURE.
Wire
Color Code
(Volts)
-100 Violet
-12.6 White/Violet
+loo
White/Red
+250 Red
Adjustment
-lOOV
Adj R471
-12.6V Adj R488
+1OOV
Adj R453
+250V Adj R432
5-13.
ADJUSTMENTS
OF
HIGH-VOLTAGE SUPPLY.
a.
Connect the Voltage Divider to the
DC
probe of
b. Set Voltmeter to 3-volt -DC range.
c.
Set the Voltmeter Calibrator for -300 volts DC
output, and connect divider tip to the output.
d. Set the gain adjustment
of
the Model 410B/C (lo-
cated
at
the
rear
of the instrument) for
a
reading of
exactly 3 volts.
e.
Set the Voltmeter to the30-voltrange, andmea-
sure
the high voltage supply. This may be done at the
junction of R651 and R652.
a
Model 410B/C Voltmeter.
f.
Set High Voltage Adjust R619 for -2350 volts.
g.
Recalibrate the Model 410B/rJ.
5-14.
INTENSITY
LIMIT
ADJUSTMENT.
a.
Center
a
defocused spot on the CRT.
5-2
Model
141A
b. Set INTENSITY to 10 o’clock.
c. Adjust Intensity Limit R612 until spot is just
extinguished.
5-15.
ASTIGMATISM ADJUSTMENT.
a. Center
a
low-intensity spot on the CRT.
b. Adjust FOCUS and ASTIGMATISM for
a
small,
round, sharply-focused spot.
5
-1
6.
GEOMETRY
ADJUSTMENT.
a.
Set: TRIGGER LEVEL
*
-
* * * *
AUTO
b. Connect a 400-kHz signal fromtheAudio Oscil-
c. Adjust vertical and horizontalcontrols to obtain
d. Adjust Geometry R643 to obtain the straightest
SWEEP TIME.
.
* *
* *
0.2
MSEC,’CM
lator to the vertical INPUT of the amplifier plug-in.
a
pattern 8 cm high.
possible edges on the rectangular pattern.
5
-1
7.
CALIBRATION ADJUSTMENT.
a.
Connect
a
10 VOLT Pk-Pk signalfrom thevolt-
meter Calibrator to the vertical amplifier INPUT.
b. Set amplifier SENSITMTY to 0.5V./CM, INPUT
coupling to
DC.
c. Adjust vertical VERNIER for exactly 10 cm
deflection.
d. Disconnect the Voltmeter Calibrator, and con-
nect the
1OV
CALIBRATOR output to the amplifier
INPUT.
e. Set Cal Adj R494 for exactly 10 cm deflection.
5-18.
PULSE CIRCUIT ADJUSTMENT.
5-19. PULSE AMPLITUDE ADJUSTMENT. The
,Pulse Ampl. .Qdj, R714 shouldbeadjusted to the fully
clockwise position. Note the typical waveform for test
point
7.
ADJUSTMENT. No test equipment is required for
this adjustment.
a.
Set Presentation Selector to WRITE, PERSIST-
ENCE counterclockwise to, but not in, NORMAL de-
tent, and WRITING RATE to MAX.
b. Adjust Flood Gun Adj, R726 for maximum diam-
eter illumination of the screen with no dark areas.
c. Switch WRITING RATE to NORMAL.
d. Adjust Coll Write Adj, R725,
so
two rings of
illumination are on the circumference of the viewing
area of the screen.
5-20. FLOOD GUN AND COLLIMATOR WRITE
(See Figure 3-2.)
Note
The two rings of
il-
lumination may not
be exactly concentric.
5-21. LEVEL ADJUSTMENT. No test equipment
is
required for this adjustment.
a.
Set Presentation Selector to WRITE,
PERSIST-
ENCE fully clockwise and WRITING RATE to MAX.
02567-1
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