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DIDS-402-2M 1 0
Para 2-3.5
(3)
Check that the displayed chzracters remain stable for a mini-
mwn of three complete turns of the delay-line adjustment screw.
(4)
Turn the adjustment screw to the center of its stable range.
b.
Double delay-line adjustment
(1)
Remove the wire from A13
t
pin 6.
(2)
Connect the oscilloscope external trigger to AIO, pin F and
switch to minus (-) extension trigger.
Connect one oscillo-
scope probe to AIO, pin F and the other 'to AlO, junction of
C7 and R26.
(3)
Turn the top delay-line adjustment screw so that the falling
edges of the clock pulses are lined up with the centers of the
peaks of the sine waves (see figure 2-9).
The waveforms
shown are not representative of any particular character. )
CLOCK PULSES
BEFORE ADJUSTMENT
AFTER ADJUSTMENT
0105,,7-150
Figure 2- 9.
Delay- Line Adjustment
(4)
Reconnect the wire to A13, pin 6.
(5)
Depress and release the FRAME RESET key and, at the same
time, turn the delay-line adjustment screw on the delay line
two turns.
(6)
Repeat step (5) until the screen displays stable character.
(7)
Check that the displayed characters remain stable for a mini-
mum of three complete turns of the delay-line adjustment screw.
(8)
Turn the delay-line adjustment screw to the center of its stable
range.
2-9
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