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DIDS-402 -2AM13
f.
When the screen displays stable characters, turn the bottom delay-
line adjustment screw three additional turns.
The displayed charac-
ters should remain stable.
~.
Adjust the bottom delay-line adjustment screw to the center of its
stable range.
h.
Repeat steps!:,., f, and
Ii
for the top delay line.
i.
When adjustment is complete, either adjustment screw should be
adjustable three turns in either direction without losing character
stabilization.
If this degree of adjustment is possible, then both
delay lines are properly adjusted.
If not, then the delay-line
section at fault should be readjusted to another null point and the
procedures outlined in steps
~
through
.&
should be repeated.
Note
Adjusting the delay line is a difficult procedure.
Each delay line section may have as many as six
null positions, only one of which is correct.
Both
section s must be adjusted to the correct null point
in order to realize optimum display terminal
operation.
CLOCK PULSES
BEFORE ADJUSTMENT
AFTER ADJUSTMENT
010567-150
Figure 2 -3.
Delay-Line Adjustment
2 - 3. 3. 3 Video Amplifie r A8
The video amplifier need be adjusted only when the cursor symbol ( ) is
not clearly visible on the screen.
If the cursor is not visible, and increasing
the screen brightness does not improve cursor definition, perform the following
adjustment:
a.
Depress the CURSR RESET key to place the cursor symbol in the
first-line, first-character position.
2-7
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