Tektronix 4010 Maintenance Manual page 61

d. Upon completion of step c, measure the voltage at
pin 33 on the extender card and write that value opposite
STORAGE LEVEL on the tag on the CRT shield. Simply
cross out the old value without obliterating it.
7. Cursor Brightness Check/Adjustment (R28-
Cursor Brightness, on TC-1 in the pedestal)
a. Put the LOCAL/LINE switch at LOCAL. Press PAGE
to erase the display.
b. Note the intensity of the Alpha cursor. It should be
bright enough for convenient viewing, but not so bright
that it stores.
c. Adjust Cursor Brightness (R28 on edge of TC-1) to
obtain the desired intensity. See Fig. 4-7 for adjustment
location.
(A) Fade-Positive
(8) Drop-Out
Fig. 4-9. Display Conditions.
@i:
Adjustment-4010 Maintenance
8. Corner Focus Check/Adjustment (FOCUS
ADJUST on High Voltage and Z Axis Board in
display unit)
a. Press PAGE. Enter a K and note the appearance of its
two diagonal legs. They should appear similar. The dots
which make up the lines should be round.
b. Adjust FOCUS ADJUST (alongside yoke housing in
display unit-Fig. 4-10) in small increments, pressing K
after each adjustment, until the dots achieve optimum
roundness and the two diagonal legs appear similar. Press
PAGE as necessary to keep writing in the corner of the
display area.
c. Switch the LOCAL/LINE switch to LINE. Press K
and the display should fill up with Ks. Compare the letters
in the four corners. They should appear similar. If
noticeable difference exists, slightly adjust FOCUS
ADJUST, pressing PAGE and K and then recheck. Repeat
until the best focus compromise is achieved for the four
corners.
Fig. 4-10. Alpha Focus and Vector Focus Adjustment Locations.
4-15