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