Keysight E4982A Troubleshooting Manual page 27

LCR Meter
Step 2.
Check system fan inside.
If the system fan, located on the left side of the chassis
inside the E4982A, 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
E4982A 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
seems to be in the A60 CPU module.
Figure 6 LED of the Num Lock key
Check the following before replacing the A60 CPU module.
• Connections to the A60 CPU Module are normal
• There are no disconnections or loose connections
Troubleshooting
Figure 6, a problem
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