480 Chapter9
Controller Section
Display Problems (8560E)
Coupling ................................................................ ac
Triggering .................................................. External
10.Trigger the oscilloscope on the signal at U207 pin 8 (LBRIGHT).
11.The following waveforms should look like Figure 9-6 on page 481 on
the oscilloscope. The top two traces are for the X line generator and
the bottom two traces for the Y line generator.
X line generator
— U201 pin 1
— TP2
Y line generator
— U203 pin 1
— TP1
12.Figure 9-7 on page 481 illustrates the waveforms in step 11
expanded to show relative timing. the second and fourth traces are
delayed by 5 ms from the first and third. The oscilloscope settings
are changed as follows:
Sweep time .............................................................. 20µs/div
13.Figure 9-8 on page 482 illustrates the waveforms of properly
working line generators. Whenever there is a pulse on TP2 (or TP1),
the appropriate integrator U201B (or U203B) generates a ramp (the
output vector) which feeds back to U201A (U203A) and shows on its
output.
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