What must manufacturers have in place regarding Pb-free control?

Manufacturers must have a written Pb-free control plan in place to ensure compliance with standards related to lead-free soldering processes. This requirement is essential because such a plan outlines the procedures, practices, and controls that a manufacturer will implement to transition from leaded to lead-free materials effectively. Having a written plan ensures accountability and clarity throughout the manufacturing process, which is crucial for achieving consistent quality and performance in soldered electrical and electronic assemblies.

The written Pb-free control plan acts as a foundational document that guides the implementation of lead-free soldering practices, addresses any potential risks involved, and complies with various regulations and customer requirements. This plan typically includes details about material specifications, process controls, personnel training, and quality assurance measures, all of which are vital for successful Pb-free manufacturing.

While training programs, risk assessments, and production schedules are also important components of a manufacturing process, they serve as supportive elements rather than the primary requirement for Pb-free control. These elements may be included in the plan but do not replace the necessity of having the written plan itself, which is why it is the correct answer.