www.pdr-rework.com
Principles of Operation (continued)
The PDR Rework system is designed for rework single/double sided and mixed technology PCB assemblies. The top
heat/component heating is derived from a 150 Watt short wave IR lamp focused through a lens system. The bottom
heat/PCB preheater delivers 750-3000 Watts medium wave IR. In normal use, approximately 30-40% of the energy is
provided by the top heat, and 60-70% of the energy is provided by the back heat. The above diagrams show how the
energy is applied to a component and PCB, how the component temperature is measured and also a typical thermal
profile.
The Key Parts of the PDR System
Infra-Red Lamp/Lens System
The IR lamp/lens system comprises an Infra-Red lamp, an upper lens assembly, an iris assembly and a lens
attachment.
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