Combined PDF datasheet covering the SED1530, SED1531 and SED1532, small at about 67 KB. These Epson parts are LCD driver and controller chips for small dot-matrix displays, and one document describes the family together with the differences between members. Expect pinouts, the instruction set, display RAM organisation and power supply requirements. A technician uses it to trace interface signals and LCD bias rails on a faulty module. Note which exact variant is fitted, as segment and common counts may differ between them.
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 @acodis_lcd_datasheets_EDID. Enginerys does not host this file.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.