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Chapter 5: Troubleshooting
Troubleshooting the Agilent 1680A,AD-series
4 Using an oscilloscope, probe pins 39 and 40 of J111 for +3.3Vdc
If +3.3Vdc is present on J111 of pins 39 and 40, and digital signals are present on
the video data pins indicated above, then the CPU board video circuit is operating
properly.
5 Remove power. Allow time for the capacitors in the power supply to
discharge before disconnecting the power supply, doing the repair, and
reassembling the instrument.
To test disk drive voltages
The following procedure is a guide to help further identify possible problems with
either the flexible disk drive or hard disk drive.
Equipment Required
1 Close the Agilent Logic Analyzer application and all other applications
running on the logic analyzer.
2 Shut down the instrument.
a Click on the Start button in the task bar, then select Shut Down.
b In the Shut Down window, select Shut Down from the menu, then
select the OK button.
3 After the instrument turns off, unplug the instrument and remove the
cover.
4 Disconnect the suspect disk drive. Remove the disk drive from the chassis
and reconnect the cable.
5 Troubleshoot a hard disk drive.
a Apply power to the instrument.
Equipment Critical Specification Recommended Model/Part
Digitizing Oscilloscope > 100 MHz Bandwidth 54600B