Section V
Paragraph 5-22 and Table 5-3
Model 141A
Table 5-3. Condensed Adjustment Procedure
~~
Test
~~
Procedure
Adjust
External Equip-
ment Required
Low
Voltage
Supplies
~~
DC Voltmeter
~~~~~ ~
Measur e
:
-100 v (Violet)
-12.6
v
(White/Violet)
+lo0 v (White/Red)
+250 v (Red)
R471
R488
R453
R432
High
Voltage
Supply
a.
Calibrate Divider
-
Voltmeter
combination.
b. Measure -2350 v
R619 for -2350 volts
DC
VTVM; 100:1
Divider; Voltmeter
Calibrator
Intensity
Limit
None
a.
Center
a
defocused spot.
b. Set INTENSITY to 10 o'clock.
R612 until spot
is
just
extinguished.
Astigma-
tism
None
Center
a
low-intensity spot.
FOCUS and ASTIGMATISN
for sharp spot.
Geometry
Audio Oscillator
~ ~~
R643 for straightest
edges.
a.
TRIGGER LEVEL to AUTO
SWEEP TIME to 0.2 MSEC/CM
b. Connect 400
kHz
sine wave to
vertical INPUT.
c. Obtain pattern 8 cm high.
Calibrator
Voltmeter
Calibrator
a.
SENSITIVITY to
0.
5 V/CM
b. Apply 10 v pk-pk from Voltmeter
Calibrator to vertical INPUT.
c. Adjust vertical VERNIER for
10 cm deflection.
d. Connect 10 V CALIBRATOR to
vertical INPUT.
Cal Adj R494 for
10
cm
deflection.
Pulse Amp1
Adj
None
None
R714 fully cw.
Flood Gun and
Coll Write Adj
None a. R726 max diameter
uniform illumination.
a.
WRITE, PERSISTENCE out of
NORMAL, WRITING RATE to
MAX
b. WRITING RATE to NORMAL b. R725 illumination
rings on circumfer-
ence of screen
Level Adj None
PERSISTENCE cw, WRITING RATE
to MAX, ERASE
2
sec then WRITE
R743 uniform illumina-
tion
Coll Stor-
age Adj
LF Oscilloscope
Test scope 20 ,usec/cm, Iv/cm
STORE, WRITING RATE to
NORMAL, test scope to R725 wiper.
R727 for test point
11
waveform
b.
Rotate Presentation Selector to ERASE for
2
a.
Set test oscilloscope sweep time for 20 ysec/cm
seconds and
release.
and sensitivity for
1
v/cm.
b.
Set Model 141A PresentationSelector
to
STORE
and WRITING RATE to NORMAL.
c. Connect test oscilloscope, through
1O:l
divider
probe, to wiper of R725
(test
point
11).
a.
Adjust Coll Store Adj,
R727,
for a55 to 60-volt
pulse. (Correct pulseshownfor testpoint
lf
in Table
5-7.
)
02567-1
c.
Adjust Level Adj, R743, for the most uniform
background illumination of the screen (midway between
dark and maximum illumination). See Figure 3-2 for
typical illumination.
5-22. COLLIMATOR STORAGE ADJUSTMENT. The
low-frequency oscilloscope
is
required
for
this
adjustment.
5-4
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