4.1 Replacing the HEUA
The HEUA monitors the heat exchanger. The HEUA provides power to the FAN unit, monitors
the status of the FAN unit, and collects the alarm information about the cabinet and reports the
alarm to the main control unit.
Prerequisite
l The tools and materials, such as an ESD wrist strap or ESD gloves and M6 screwdriver,
are ready.
l The quantity and type of board to be replaced are confirmed, and the new board is ready.
l The authorized personnel are permitted to enter the site. The required keys are available.
Context
Figure 4-1 shows the position of the HEUA in the OMB.
Figure 4-1 Position of the HEUA
HEUA
Procedure
Step 1 Wear an ESD wrist strap or a pair of ESD gloves.
4 Replacing the Components in the OMB
BBU3900
Hardware Maintenance Guide
4-2 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Issue 03 (2010-06-05)
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