Tektronix 5441 Instruction Manual page 86

Adjustment Procedure-5441/~5441
F. READOUT SYSTEM
Equipment Required
Screwdriver
NOTE
If the Readout System was deleted from the instru-
ment (Option Ol), omit the following procedure.
It is not necessary to install any plug-ins to perform this
procedure. With plug-ins installed and Q1040 removed, ran-
dom characters will appear; with plug-in and Q1040 re-
moved, all zeros will appear.
1.
Adjust Vertical Spacing
.
Remove Q1040 from its socket on the Readout board.
See Fig. 4-7A for the location.
b. Pull the POWER switch on and set the READOUT
INTENS control for visible characters.
c. CHECK-Crt display for two rows of zeros, 40 zeros
to a row with no overlap. The two rows of zeros should be
located vertically in the middle of the top and bottom divi-
sions of the graticule. See Fig. 4-78.
d. ADJUST-Vertical Spacing I31118 to position the top
row of readout characters to the middle of the top graticule
division. Then adjust Vertical Centering R135 (located on
vertical circuit board) so the bottom row of readout charac-
ters is in the middle of the bottom graticule division. Some
interaction will occur between adjustment of R1118 and
R135. Repeat until correct readout character location is
achieved. See Fig. 4-7A and 4-78.
2. Adjust Horizontal Positioning
a. CHECK-That the first and last characters of both Fig. 4-7. (A) Locations of Readout Adjustment and ~ 1 0 4 0 ; (6)
rows of zeros are within the graticule area. See Fig. 4-78.
Readout display with Q1040 removed (with plug-ins removed).
b. ADJUST-Horizontal Positioning R1110 to position
3. Adjust Character Scan
both rows of zeros so the first and last characters are within a. CHECK-Displayed characters for completeness
the graticule area. See Fig. 4-78 for correct positioning of without overscanning (overscanning causes a bright dot
the readout display. where traces overlap).
REV MAY 1982