Process Goals and Guidelines

Terms and Definitions

WE HIGHLY RECOMMEND THAT YOU BECOME FAMILIAR WITH THIS GENERAL SECTION FIRST
BEFORE PROCEEDING AS IT CONTAINS IMPORTANT BACKGROUND INFORMATION FOR EVERY
PROCESS GUIDE CONTAINED IN THIS DOCUMENT!

Introduction

Each assembly/rework method has certain advantages and disadvantages depending on the particular thru-hole or Surface Mount Device (SMD) {lead/terminations design, size, body material, etc.}, component mounting site {adjacent components, access, substrate type, thermal mass, etc.} and the skill of the operator. For this reason, it is advisable to select a method which is likely to be the most appropriate based on the following Process Goals and Guidelines, and your organization’s own particular requirements.

In the three basic processes of Non-destructive Component Removal, Surface Mount Land Preparation and High-reliability Component Installation/Replacement, the fundamental Process Goals and Guidelines are as follows:

Non-destructive Process - During any assembly or rework process, no damage or degradation should occur to the board (both substrate and circuit elements), adjacent components, and the component to be installed or removed. This damage may be either mechanical, thermo/mechanical or purely thermal in nature and may result in either immediate failure, degradation in performance over time (latent failure) or a reduction in reliability. EOS/ESD damage must also be avoided by using proper workstations, procedures and equipment controls.

Controllable, Reliable and Repeatable Process - The process can be employed, and when necessary, modified by a trained operator in a repetitive fashion with consistently acceptable results.

Process Appropriate to Particular Application - The process (or modification thereof) employed is appropriate to the particular application based on the relevant guidelines described below.

Operator Friendly Process - An operator of average ability can, with proper training and practice, become acceptably proficient in employing, and when required, modifying the process to suit any particular requirements of a given task.

Efficient/Economical Process - The process can be economically and easily set up and carried out at multiple locations in a production or repair environment with minimal training and set-up time.