When a device needs to come off a PCB and be replaced due to improper orientation, wrong part number or value, defective solder fillets the operation is a rework of a PCB. The processes for taking off different parts are governed by the industry workbook IPC 7711/21 Rework and Repair of Printed Circuit Boards.

Some of the processes for reworking devices are such that hand soldering is used for common devices for SMT connectors, passive components, PLCCs and others. There is however other more complex devices, many of which have non inspectable solder fillet areas that require a different rework method. Common devices requiring rework that consists of mimicking the initial assembly process include but are not limited to devices such as QFPs, BGAs and QFNs. When reworking these devices the device is first removed and site prepped and cleaned. In many cases the solder is re-applied using a...