Basic Operation Process and Precautions


To ensure that the device provides uninterrupted communication services for users in networks, parts of a device are replaced mostly when the power is on. Therefore, to ensure safe operation of a device and to minimize the impact of parts replacement on services, maintenance personnel must strictly abide by the basic operation process regulated in the manual, as shown in Figure 1.

Figure 1 Basic operation process of replacing parts


  1. Assess the feasibility of the operation.

    During the process of troubleshooting or repairing a device, maintenance personnel must assess whether the operation is feasible before replacing a certain part.

    1. Whether the needed spare parts are available in the depot.
    2. Whether the maintenance personnel is qualified for carrying out the operation.

      Parts replacement can be carried out only by maintenance personnel who are professionally trained. That is, maintenance personnel must familiarize themselves with the functions of each part of the device, know the basic operation process of parts replacement, and master the basic skills of parts replacement.

    3. Whether the risks of the operation can be controlled.

      Parts replacement is risky to a certain extent. Hence, improper operation may cause abnormal running of the device, service interruption, or injuries to the personnel. Therefore, before replacing parts, maintenance personnel must comprehensively evaluate the risks of the operation, that is, whether the risks can be controlled through certain measures if the system remains active. Maintenance personnel can replace the parts only when the risks can be controlled. Otherwise, contact a Huawei local office for timely technical support.

  2. Prepare tools and spare parts.

    After determining that the operation is feasible, maintenance personnel need to prepare tools and spare parts.

    1. Prepare spare parts.

      Before replacing the component, contact Huawei engineers to see if a license is required. You can apply for a license or use Stick License to activate some license control items.

    2. The common tools include the multimeter, cable tester, ESD wrist strap, Phillips screwdriver, flat-head screwdriver, needle-nose pliers, cutter, and pliers.
  3. Take protective measures.

    Although parts replacement is risky, in most cases, however, maintenance personnel can prevent the risks by taking protective measures. For example, before replacing a master board, maintenance personnel can switch services on the master board to the slave board. After the slave board runs properly, maintenance personnel can replace the master board. In this manner, interruption of services is prevented.

    Therefore, to ensure safe operation of a device and to minimize the impact of parts replacement on services, maintenance personnel must take related protective measures.

  4. Replace parts.

    After checking that the protective measures are available, maintenance personnel can carry out parts replacement according to the regulations specified in the manual.

    Wear an ESD wrist strap or ESD gloves before replacing parts when the power is on.

    Avoid direct eye exposure to the laser beam launched from the optical interface board or fiber.

  5. Verify the functions of the new parts.

    After completing part replacement, maintenance personnel must verify the functions of the new parts through the testing methods described in this section.

    The operation is considered successful only when the new parts are proved to be running normally. Otherwise, contact Huawei technical support personnel.

  6. Return and repair the faulty parts.

    If a part that is replaced is confirmed to be faulty, maintenance personnel should fill in the Offsite Repair Card for Faulty Materials, and send the card and the faulty part to a Huawei local office for timely maintenance.

    Carefully maintain the damaged control board that store data to prevent information leak.

    Before you replace the control board, delete data from it to prevent data embezzlement.

    Use either of the following methods to delete data from the control board:

    • Connect the control board to a PC and then delete data from the control board on the PC.
    • Physically destroy the control board.
Copyright © Huawei Technologies Co., Ltd.
Copyright © Huawei Technologies Co., Ltd.
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