18 Impedance Analyzer
1 Troubleshooting
Step 1. Check fan operation and DC monitor LED.
If the rear panel fan (blower) doesn’t run, a failure in power supply
is assumed. Remove the Keysight E4991B outer cover and check
if the following LEDs light:
• +3.3 V and +5 V DC monitor LEDs on A60 CPU module as
shown in Figure 4.
• LEDs on A51 DSP module as shown in Figure 5.
Figure 4 LEDs on CPU module
Figure 5 LEDs on DSP module
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