Huawei Y300 Maintenance Manual page 36

Y300 Maintenance Manual
Figure 9-4 Voltages
Troubleshooting
Most startup faults are caused by power supply exceptions. You can rectify startup faults by
troubleshooting power supply circuit faults. Startup faults can be divided into the following
types:


Issue 1.0 (2013-01-24)
No current: After you connect the Y300 to the DC power supply and press the power key,
the DC current ranges from 0 mA to 5 mA.
Weak current: After you connect the Y300 to the DC power supply and press the power
key, the DC current ranges from 5 mA to 100 mA.
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9 Principles and Failure Analysis
31