Schematic diagrams together with PCB layout pages in PDF for the Samsung SM-N7505, the Galaxy Note 3 Neo model given in the file. Having both the circuit diagrams and the board drawings lets a technician find where a part sits physically after identifying it in the schematic, which speeds up tracing rails, checking shorts and measuring test points. Open it in any PDF viewer and use text search for part references. Confirm the model on the device label before relying on component positions.
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 @Schematics_Mobile. Enginerys does not host this file.
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How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.