The content of the drawing has been changed, but the version of the drawing has not been upgraded accordingly. After receiving this kind of drawing, the purchasing department archives it. When making samples, the old drawing before the change is sent to the supplier by mistake, because other departments generally only look at the drawing number and do not look at the content in detail. The purchasing department believes that the drawing with this drawing number has been given to the supplier, so the new drawing with the changed content but the same drawing number was not sent to the supplier. The supplier received two old and new drawings with the same drawing number, and carelessly made samples according to the old drawing process for approval. The above results in the appearance, structure, process or electrical properties of the sample not being consistent with the drawing. Therefore, if the content of the drawing is changed, it is necessary to upgrade the version (especially those involving structure and electrical properties) to make a clear distinction.
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