Filed as a schematic, this 44.1 KB PDF carries the name 2SD1450 with an _E suffix that the name does not explain; the part number points to a datasheet. Under JIS naming, 2SD identifies an NPN transistor for low-frequency circuits. Use the document to confirm leads, voltage and current limits and gain grade before replacing a suspect part, and test the original in diode mode first. A PDF reader opens it, and the device itself may simply be marked D1450.
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.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)