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Adjustment Procedures
AM700 Audio Measurement Set Service Manual
5–17
c. Adjust L5 (Dynamic Focus) for best possible focus at the corners of the
display.
d. Recheck the white level adjustment.
8. Adjust trace rotation
a. Install the crt test graticule.
b. Display the crosshatch test pattern.
c. Connect the trace rotation coil from the yoke to J7 on the display
monitor circuit board.
d. Adjust R67 (TRACE ROT) as needed, to square the test pattern with the
test graticule.
The following procedure requires the placement and positioning of the geometry
adjustment magnets around the crt yoke and instrument chassis.
1. Display the crosshatch test pattern.
WARNING. The CRT anode voltage is a potential shock hazard. Use extreme care
when working near the anode connection and any of the high voltage leads to
the anode.
2. Position the correction magnets on the yoke coil and on the CRT along the
front edge and middle section for the best linearity.
Some trial and error positioning and placement of the magnets may be
necessary until the absolute errors are less than 1.5% or 0.075 inch horizon-
tally and 0.06 inch vertically. Because the placement and rotation of the
magnets in combination pulls or diverts the electron beam in a manner that is
not entirely predictable, noting the effect produced by the different strength
of magnet used or location and polarity of the magnet may help reaching the
best combination for good overall linearity.
Magnets specified to use are listed in Table 5–1 at the beginning of the
procedure.
3. Use clear silicone adhesive to hold magnets permanently, It may take
30 minutes to few hours depending on the type of silicone adhesive being
used.
4. This completes the alignment of the CRT display assembly. Turn off power
and disconnect any equipment connected to monitor board.
Factory Service Geometry
Fine Adjustment