46 Chapter 2
Overall Troubleshooting
Troubleshooting Power-up Problems
Troubleshooting Power-up Problems
CAUTION If the instrument shows any of the following symptoms, immediately
unplug the instrument from the ac power line:
• Smoke or unusual noise from inside the unit.
• A circuit breaker or fuse on the main ac power line opens.
These potentially serious faults must be corrected before proceeding.
Refer to “Troubleshooting Power-up Problems” on page 46.
NOTE Power-up problems include an instrument failing to boot, an instrument
that completes the boot process but displays error messages, or an
instrument that appears to be inoperative (dead).
When powered up the instrument performs a boot process and CPU
self-diagnostics, followed by a routine of internal auto-alignments.
These tests evaluate the instrument operation; if a problem is detected
an error message will be displayed, or the rear panel LEDs will indicate
a problem.
Table 2-1 Initial Symptoms
Symptom Troubleshooting Section
No front or rear panel LEDs "Troubleshooting Power-up Problems" on page 46
Blank display screen "Troubleshooting Power-up Problems" on page 46
Fans not operating "Troubleshooting Power-up Problems" on page 46
Instrument did not boot "Troubleshooting Power-up Problems" on page 46
Power-on auto-align tests failed "Troubleshooting Using Auto-Align Tests" on page 49
No response when keypad is pressed "Troubleshooting Power-up Problems" on page 46
Error Messages “Instrument Messages and Functional Tests” guide
Low signal level “RF Assembly Quick Check - E4440A, E4443A,
E4445A” on page 75
For E4446A and E4448A see page 95
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