Roughly 1 MB PDF covering the 1.5KE6.8 transient voltage suppressor, part of the 1.5KE family of 1500 W axial TVS diodes with a nominal 6.8 V breakdown rating. The larger size suggests a full family datasheet with characteristic curves and the complete voltage table. Repair work uses it to verify breakdown and clamping values and identify the cathode band when a protection diode across an input rail has failed short. Check whether the board needs the unidirectional or the bidirectional C or CA type before ordering.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @cyberlanelectonik. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.