TP48200A-D17B3
Troubleshooting Guide
4 Troubleshooting
Issue 03 (2013-05-06)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
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Step 2
If the alarm persists, check the smoke detector.
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4.3.14 Module Fault
Possible Causes
The PSU is not installed properly.
The rectifier module is faulty.
Solution
Step 1
Check whether the ALM LED on the panel of the PSU is blinking in red.
If the ALM LED is blinking in reds, the PSU is faulty. Replace the PSU.
Step 2
Alternatively, disconnect AC input from the PSU and then restart the PSU several minutes
later. If the alarm persists, replace the PSU.
----End
4.3.15 Module Shutdown and Protection
Possible Causes
Input overvoltage or undervoltage occurs in the PSU.
The rectifier module is faulty.
Solution
Step 1
Check whether the mains voltage is greater than the AC overvoltage alarm threshold (300 V)
of the PSU or smaller than the AC undervoltage alarm threshold (85 V).
For the power supply network with long-time overvoltage or undervoltage, negotiate with the
maintenance personnel of the electricity department to improve the power supply network.
Step 2
If the alarm persists when the input voltage of the PSU is in the specified range, check the
PSU. If the PSU is faulty, replace it.
----End
4.3.16 Communication Failure Between Modules
Possible Causes
The signal cable of the PSU is not connected properly.
The PSU is not installed properly.
The rectifier module is faulty.
The signal transfer board is faulty.
