To fully grasp the , let’s look at a hypothetical scenario involving a surface-mount quartz crystal, such as the Epson MA-406.
For the style:
Beyond the date, Epson embeds adjacent to the date marking. You will often see a small R-A or R-B inside a circle. seiko epson date code marking
Genuine Epson service parts (printhead assemblies, logic boards) often have a date code of 0000 or 9999 . This indicates a "service spare" manufactured outside the standard production schedule. These parts are not aged; they simply bypass the retail dating system.
Found on: Ink cartridges, toner bottles, ribbons, and printheads. To fully grasp the , let’s look at
However, for Seiko Epson crystals, a common interpretation follows the Japanese Industrial Standards (JIS) influence. The standard often looks like this:
For products made before 2000 (Epson Stylus Color 800, etc.), the year digit represented the actual year (8 = 1998). Use the same YWW logic but add 1900. Found on: Ink cartridges, toner bottles, ribbons, and
The marking typically provides: