Inspect The Power On Sequence; Check The Fan; Check The Front Displays - Agilent Technologies E4915A Service Manual

2. Inspect the Power On Sequence

Check the Fan

Turn the E4915A/E4916A power on. Inspect the fan on the left side.
The fan should be rotating and audible.
In case of unexpected results, check AC line power to the E4915A/E4916A. Check the fuse
(rating listed on the rear panel). If the problem persists, continue with the 3. Troubleshoot the
Power Supply section.

Check the Front Displays

Turn on the E4915A/E4916A and watch for the following events in this order:
1. Beep is sounding and the Comparator Pass/Fail LEDs turn on for a while (E4916A).
2. The E4915A/E4916A displays Memory Test Proceeding for several seconds.
3. The E4915A/E4916A displays the model number, rmware revision, installed option (except
for Option 001), and rmware revision date.
4. The E4915A/E4916A displays the copyright information.
5. The E4915A/E4916A displays the current measurement mode (for example, Xtl ) at the
lower left of the display, and other measurement information at other display area.
Note
When the E4915A/E4916A cannot obtain measurement results because of some
inappropriate setups (including no xture connection), the E4915A/E4916A
may display some status messages like W69:Out of Srch Rng even if the
E4915A/E4916A is properly operating.
In case of unexpected results, continue with 5. Perform the Self Test section.
3-2 Troubleshooting