Replacing a Main Control Module or PSU

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Worldwide

A main control module or PSU needs to be replaced.
A spare main control module or PSU of the same model is available and functional.

The new module must be installed in the same slot as the faulty module. Otherwise, the smart cooling product may fail to work properly.
Before replacing a main control module, disconnect the cables from the main control module. After replacing it, download the software and ACC Upgrade Guide from Huawei website, and upgrade it on the display module.

The module needs to be maintained from the rear door.

Figure 11-42 Module

(1) Main control module	(2) Reserved
(3) PSU 1	(4) PSU 2

Tap Shutdown on the home screen of the display module.

Exercise caution because the device is still energized after it is shut down on the home screen of the display module.
Open the rear door and remove the air filter.
Turn off the active power switch QF1 and standby power switch QF2. (For the model with a single power supply, you do not need to turn off QF2.)
Flip the clip on the module downwards, as shown by (1) in Figure 11-43.
Figure 11-43 Removing a module
Take out the handle and pull out the module from the subrack, as shown by (2) in Figure 11-43.

When installing a new module, ensure that the handle is in the upper part of the module, and the HUAWEI logo is in the lower left part of the module.
Insert the spare module into the corresponding slot, and flip the clip upwards to lock the module.
Figure 11-44 Locking a module
Install the network cable and air filter, and close the rear door.
Power on the device and tap Start on the home screen. Ensure that the smart cooling product is running normally without any alarms.

The BOM codes are 52273786, 52273786-001, 52273788, 52273788-008, 52273788-001, 52273788-002, 52273788-003, 52273788-009, 52274052, 52273539, 52273539-007, 52273539-005, 52273539-008, 52273539-006, 52273541-005, 52273541-009, 52273755-002, 52273755-003, 52273504, 52271197.