070-3753-01
492/492P Service Vol. 1
9-2-83 Rev
(1) With the front-panel controls set as directed in part fa,
activate the NARROW Video Filter and change TIME/DIV to 50 ms. Alter
nately turn the 19 level adjustments clockwise and counterclockwise
so every other potentiometer is fully clockwise and the adjacent
potentiometer is fully counterclockwise. The display should now appear
as a periodic triangular waveform.
(2) Adjust the REF LEVEL so the baseline is near full screen,
then switch on the 2 dB/DIV mode and adjust so the display is mid
screen (Fig. 3-38A).
(3) Turn Compensation adjustment R1065 counterclockwise until
the display breaks up (Fig. 3 - 3 8 B ).
(4) Now, turn R1065 clockwise 1.5 to 2 turns past the point
the display again becomes a periodic triangular waveform.
(5) Turn Horiz adjustment R1069 to center the display
(6) Return the baseline leveler adjustments to their midrange
position for a straight line display, and proceed with the baseline
leveling alignment as previously described (parts a through t).
To Next Page
