Agilent Technologies 8590 Series Service Manual page 229

• Refer to
3. Check the +12 Vdc power supplied to the A2 display. There is a
separate 12 V supply for the display assembly. This supply can be
checked at the output connector, A8J6, located on the right side of
the A8 power supply. Refer to
the continuity of the cable assembly W51 supplying the display, and
the integrity of the power supply using the procedures in this
chapter.
Figure 4-4 A16J8 Display Signal Output Pins
Chapter 4
Figure 4-4 for the location of the test points and check
the following signals at A16J8 pins, using an oscilloscope.
Check for a 60 Hz TTL signal with a pulse width of
approximately 0.2 ms and a repetition rate of approximately
18 ms at pin 2, vertical sync signal.
Check for an approximately 2.5 V pk-pk video signal at pin 3,
video signal.
Check for a 15.75 kHz TTL signal with a pulse width of
approximately 10 µs and a repetition rate of approximately
64 µs at pin 5, horizontal sync signal.
If the video, horizontal, and vertical signals are missing, but the
+12 V supply voltage is present, continue with
Troubleshooting the Analyzer
Troubleshooting the A2 Display Assembly
step
Figure 4-3. If there is a failure, check
3.
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