Service manual

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Troubleshooting
INSPECT THE POWER ON SEQUENCE
4. Troubleshooting
INSPECT THE POWER ON SEQUENCE
Check the Fan
Turn the analyzer power on. Inspect the fan on the rear panel.
• The fan should be rotating and audible.
If case of unexpected results, check AC line power to the analyzer. Check the fuse (rating
listed on the rear panel). Check the line voltage setting. For setting the line voltage, see the
Power Requirements in Appendix B.
If the problem persists, continue with the Power Supply Troubleshooting chapter.
Check the Front Panel LEDs and Displays
Turn on the analyzer and watch for the following events in this order:
1. Three LEDs for [A], [B], and Rmt are lit temporarily. Beep is sounding.
2. The three LEDs turn off. The beep stops.
3. In a minute, the [A] LED turns on and the analyzer displays Internal Test In Progress
for several seconds.
4. The analyzer displays the graticule.
If case of unexpected results, continue with Digital Control Troubleshooting chapter.
Check Error Message
Turn the analyzer power on. Inspect the LCD. No error message should be displayed.
If the following status annotation or error message appears on the LCD, continue with the
INTERNAL TESTS FAILURE TROUBLESHOOTING in this chapter.
• “Svc” (Status annotation)
• “POWER ON TEST FAILED”
These error messages indicate that one of the power-on self tests fails. If an other error
message appears, refer to the Error Messages chapter.
If the response of front panel, GPIB commands, or built-in FDD is unexpected, continue
with the Digital Control Troubleshooting chapter.