Highly Efficient PCB Repair

The radiation spectrum of (2-8 µm) mid-wave IR emitters is suitable for the efficient and homogeneous heating-up of materials used in electronic manufacturing. The radiation maximum of halogen emitters on the other hand ranges in the short-wave range and can cause uneven heating during PCB repair.

In difference to true IR technology in hybrid heating processes, the radiant heat is complemented with a share of convection heat, which makes the thermal transfer even more effective.

Alongside the introduction of lead-free technology and the spreading of new component types like BTC (bottom-terminated component) the demands on the heat input into the PCB increased. Lead-free solders with their higher melting points requires a homogeneous heating also from the bottom side to ensure successful PCB repair.

Whereas the Ersa IR550 is equipped with ceramic emitters in HTS design, the larger IR650 uses the more responsive lower heating with HRS emitters. This enables an even more efficient preheating of the PCBs and shorter process times.

For the further development of Ersa Rework Systems Elstein established the new SFH emitters in 2007. These have proven themselves to be the ideal IR lower heating up to now, f. e. with the HR 600/2 or the recently introduced Ersa HR 550.

Whereas the homogeneous heating of the PCBs lower side is done with IR emitters only, the HR 600/2 as the first automated Ersa Rework System is additionally equipped with a hybrid heating head. The hybrid technology combines the reliable radiant heat with a percentage of convection heat.
The additional heat input by hot air enables a faster and more focused temperature increase of the components. Which results in faster and more reliable repair processes for the user. Remarkably, it is possible to keep the hot-air flow at a minimum. Neighboring components neither are damaged by emissive jets nor are remelted chips moved out of their position.

Like in true IR systems, it is very easy with hybrid systems to shield sensitive areas of the PCB to keep them below melting temperature. They can be covered with a protective foil or heat absorbing material. In combination with the closed-loop control Ersa Rework Systems currently offer the most sensitive technology for the repair of modern SMT assemblies. There are almost no limits in application: metal protection shields and SMD plugs, as well as sockets, are as easily processed as large BGA components, small MLFs or sensitive LEDs.

The cooperation of two long-established companies enabled this and several thousands of installed Ersa Rework Systems confirm the technological advantage of controllable radiation heat in the rework processes of customers.