Chapter 2 23
Troubleshooting
No Display Troubleshooting
2. 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
E5061B outer cover and check if the following LEDs light:
• +3.3 V and +5 V dc monitor LEDs on A50/A60 CPU Module as shown in Figure 2-4
• LEDs on DSP module as shown in Figure 2-5
Figure 2-4 LEDs on CPU module
Figure 2-5 LEDs on DSP module
NOTE To check all the outputs of the power supply, measure the dc voltages at the output lead
connectors with a DMM. The dc output voltages and lead color information is provided in
the module cover label of the power supply.
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