482 Chapter9
Controller Section
Display Problems (8560E)
Figure 9-8 Normal X/Y Line Generator Waveforms
Intensity
1. The length of the vector being drawn can effect intensity. U210A,
U210C, and U210D sum the lengths of the X and Y vectors. Refer to
"Long Lines Dimmer than Short Lines" in this chapter.
2. Short A2U207 pin 6 to pin 7. If the display does not brighten,
troubleshoot LBRIGHT switch, U207B. This switch intensifies trace
A and active softkeys.
3. Short A2U207 pin 2 to pin 3. If the display does not brighten,
troubleshoot DEF1 switch, U207A. This switch is used in analog
zero-span.
4. Change the intensity (under
DISPLAY). If the intensity does not
change, troubleshoot the intensity DAC, A2U212A. (A2U212A is
controlled from the front panel.) The amplitude of the waveform at
U211A pin 1 should increase or decrease with intensity changes.
5. Clamp U211B limits the voltage to about 4.2 V. Short A2J201-1 to
ground and set the intensity DAC to a number greater than 80. A
major portion of the waveform should be limited to 4.2 V.
6. If a major portion of the waveform is not limited to 4.2 V,
troubleshoot the maximum brightness clamp, A2U211C.
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