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Adjustment Procedures
TDS 684A, TDS 744A, & TDS 784A Service Manual
5–23
H Press the main-menu button EXECUTE; then press the side-menu
button Ok Confirm Run Test.
b. Make the contrast adjustment:
H Locate R404. It is one of the adjustments on the left side of the
instrument located just ahead of the fan. It is the fifth adjustment
from the fan.
H Monitor the luminance at center screen using a J16 photometer and a
luminance probe.
H Adjust R404 (CONTRAST) for a reading of 40 foot lamberts.
NOTE. The adjustments for contrast and brightness interact with each other.
5. Restore the oscilloscope to normal operation:
a. Restore the dip switch to the settings that follow:
Switch No. 1 2 3 4 5 6 7 8
Open X
Closed X X X X X X X
b. Power off the oscilloscope.
c. See Removal and Installation Procedures in Section 6 to reinstall the
cabinet and other modules removed in step 1.