Adjustment Procedures
5-22
TDS 420A, TDS 430A & TDS 460A Service Manual
3. Adjust the display brightness:
a. Display the Circle test pattern:
H Disconnect the power plug from the oscilloscope.
H Set the DIP switch (S1), located near the front of the A03 CPU
board, as follows:
Switch No. 1 2 3 4 5 6 7 8
Open X X
Closed X X X X X X
H Reconnect the power plug to the oscilloscope.
H For instrument serial numbers B079999 and below reconnect the
power plug and ensure the power switch is in the on position.
H Allow 15 to 20 minutes for the oscilloscope to warm up.
H Press SHIFT and UTILITY.
H Repeatedly press the main-menu button System until Diag/Err is
highlighted in the pop up menu.
H Repeatedly press the main-menu button Area until Display is
highlighted in the pop up menu.
H Repeatedly press the side-menu button -- m o r e -- until Circle appears
in the side menu. Push Circle.
H Press the main-menu button EXECUTE. Then press the side-menu
button Ok Confirm Run Test.
b. Make the brightness adjustment:
H Locate R482 (BRITE) (see Figure 5--11).
H Adjust R482 until the background raster lines in the 5% luminance
patch (see Figure 5--12 on page 5--24) disappear while the lines in
the 10% luminance patch are visible.
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