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This topic describes how to clean boards.
Remarks
Boards are free of dust.
ϒ⁄Take electro-static discharge(ESD) measures during the whole process of routine maintenance. For example, perform operations on an ESD workbench, and wear ESD clothes, wrist straps, and gloves.
ϒ⁄Clean boards when service traffic is low, for example, between 2:00 a.m. and 4:00 a.m.
ϒ⁄Choose the cleaning agent according to the related national standards strictly. Otherwise, the boards may be damaged.
Procedure
1.Provide backup boards.
Before cleaning all the boards in the shelf, you need to provide a backup board for each type of board in the frame.
2.Replace the board to be cleaned.
To avoid faults during maintenance, replace the board to be cleaned with a backup board, strictly following the board replacement flow. Clean the replaced board only after the backup board runs normally. For the board replacement flow, see chapter Replacing Parts. See chapter Overview.
3.Remove dust from boards.
The boards can be cleaned in many ways. The key principle is to prevent the physical and electrical characteristics of the boards from being damaged. The two most common methods are:
ϒ⁄Using a vacuum cleaner
Use a clean and dry ESD soft brush to slightly wipe the dust off the board surface. At the same time, point the suction nozzle of a vacuum cleaner at the brush to suck the dust.
A vacuum cleaner is simple in operation and cheap in cost, but it fails to remove the harmful gas absorbed on the board surface.
ϒ⁄Using a cleaning agent
Use a dedicated anhydrous, nonerosive, nonconductive, and high-volatility cleaning agent to clean the boards, for example, isopropanol (IPA).
Wear a protective face mask when using cleaning agents.
A cleaning agent removes not only the dust from the boards entirely, but also most of the harmful gases absorbed on the surface of the boards. This method is complicated in operation and high in cost.
4.Clean boards in turn.
Due to the large number of spare parts, it is impossible to replace all the boards to be cleaned at the same time. In this case, replace a board to be cleaned with the already cleaned board of the same type.
Troubleshooting
If the board has too much dust, please clean the boards. For details, see section Procedure.
Parent Topic: Removing Dust from Equipment