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Adjustment Procedures
5–18
AM700 Audio Measurement Set Service Manual
The following procedure is used to make the CRT alignment adjustments on an
installed display monitor. It is used to compensate for the minor changes that can
affect the CRT adjustments over time.
1. Perform the verification procedure of the CRT display (Verify CRT Display
Operation on page 4–33) to determine the extend of adjustment needed.
Make only the adjustments needed as indicated from the verification
procedure.
2. It may be necessary to remove the disk drive assembly if the adjustments
located beneath it have to be accessed. Remove the disk drive assembly.
Leave it off until after the CRT adjustments are checked for centering,
height, width, and linearity.
3. Make the following display monitor adjustments as determined in step 1.
a. Adjust L4 (WIDTH) so that the width of the Analyzer display at the
center is 5.04 inches (12.80 cm).
b. Adjust R43 (V SIZE) so that the height of the Analyzer display at the
center is 3.78 inches (9.60 cm).
c. Adjust R57 (V CENTER) to center the display vertically in the between
the top and bottom edges of the CRT opening in the bezel.
d. Adjust R15 (H PHASE) to center the display horizontally between the
left and right edges of the CRT opening in the bezel.
e. Adjust R48 (V LIN), if needed, so that the two top view window squares
and the two bottom view window squares are the same size vertically.
f. Interaction between these adjustments requires a recheck of part a
through part e for best size and linearity.
g. Adjust R36 (FOCUS) if needed, for the best focus possible in the center
of the screen.
h. Adjust R67 (TRACE ROT) as needed, to make the top and bottom edges
of the display parallel to the top and bottom edges of the CRT opening in
the bezel.
4. Turn off the power to the AM700 and reinstall the disk drive assembly if it
was removed.
5. Restore power to the AM700 and select the Analyzer application.
6. Examine the top, bottom, and sides of the display to determine if there is
excessive bowing or wowing of the edges.
CRT Display Adjustment