Troubleshooting 1
Impedance Analyzer 19
Step 2. Check system fan inside.
If the system fan, located on the left side of the chassis inside the
Keysight E4991B, does not run, the problem seems to be in the
A51 DSP board or the flat cable between the A51 DSP board and
A60 CPU module. In this case, remove the Keysight E4991B outer
cover and determine if the fan runs or not.
If a beep and power shutdown occurs immediately after the
power is turned on, there is a possibility that the fan would not
run. The power shutdown occurs the moment the system fan
stops by any anomaly. In this case, check the fan.
If the power shutdown occurs without a beep, the problem seems
to be with the A51 DSP board or the A60 CPU module.
Step 3. Check LED of “Num Lock” key.
Press the Num Lock key on the keyboard. If the LED on the
keyboard does not light as shown in Figure 6, a problem seems to
be in the A60 CPU module.
Check the following before replacing the A60 CPU module.
• Connections to the A60 CPU Module are normal
• There are no disconnections or loose connections
Figure 6 LED of the Num Lock key
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