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Adjustment Procedures
5–14
AM700 Audio Measurement Set Service Manual
4. Center the display using the beam centering rings.
NOTE. The centering rings cause some distortion to the display. Adjust the
centering rings for the least amount of distortion and the best centering.
5. Repeat step 3 and step 4 until the full screen display is correctly centered.
6. Loosen the yoke retaining screw and rotate the deflection yoke so that the
raster is parallel to the bottom of the front chassis casting.
7. Tighten the screw on the retaining ring, making sure the yoke is all the way
up against the CRT.
8. Adjust R64 (BLACK) until the raster just disappears from screen.
9. Fine adjustment of the CRT geometry may require several correction
magnets. Use of the magnets for adjustment is given in the Factory Service
Geometry Fine Adjustment procedure on page 5–17
.
1. Adjust horizontal and vertical scan rates.
a. Connect the CH1 oscilloscope probe to TP1 (horizontal retrace). See
Figure 5–4 for test point and adjustment locations.
b. Adjust R20 (H HOLD) for 31.469 kHz at TP1–31.78 ms. Within the
range of 31.68 kHz to 31.88 kHz is acceptable.
c. Connect the CH1 oscilloscope probe to TP2 (vertical retrace).
d. Adjust R45 (V HOLD) for 55 Hz at TP2–18.2 ms. Within the range of
18.1 ms to 18.3 ms is acceptable.
Check and Adjust
Free-running Display