TB 9-6625-1995-24
Figure 1. Triggering adjustments, SN B070000 and above - right side view.
(13) Adjust R175 (fig. 1) so the main sweep untriggers between 0.3 and 0.1 division
from bottom of waveform as MAIN TRIGGERING LEVEL control is rotated through
negative ( ) portion of its range.
(14) Adjust MAIN TRIGGERING LEVEL control to 0 and press MAIN
TRIGGERING SOURCE EXT pushbutton.
(15) Adjust R99 (fig. 1) for a sweep trigger point at graticule centerline (TRIG'D
light on).
(16) Press MAIN TRIGGERING SOURCE INT pushbutton.
NOTE
Perform (17) through (20) below only for A8 main trigger
boards, SN B099985 & above.
(17) Press MAIN TRIGGERING COUPLING AC HF REJ pushbutton. Adjust
R90 (SN B099985 and above) (fig. 1) for a sweep trigger point 1 division above center
graticule.
and note the sweep trigger point
(18) Set MAIN TRIGGERING SLOPE switch to
position.
(19) Adjust R90 (SN B099985 and above) (fig. 1) so the sweep trigger point is the
same distance from center for both and MAIN TRIGGERING SLOPE switch settings.
(20) Set MAIN TRIGGERING SLOPE switch to
and press MAIN TRIGGERING
COUPLING AC pushbutton.
(21) Move connection from MAIN TRIG IN to DLY'D TRIG IN.
(22) Repeat (6) and (7) above.
(23) Adjust R230, R255, and R320 (fig. 1) to midrange.
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