Hold down the , CARD , and COMBI buttons simultaneously while powering on the unit. The LCD screen will display the internal ROM version.

XXXXXXX-XXXX-XXXX-XXXX

: If you still have the original box or warranty card, the serial number was originally printed there for registration purposes. Decoding the Serial Number

If you have the original warranty card, the serial number is pre-printed on it. This is another excellent way to confirm authenticity.

For a collector’s item like the Korg M1, the serial number directly influences its financial value.

On a standard Korg M1 or M1R (rack version), the serial number is located in two primary places:

Numbers starting below 50,000 generally denote first-year production models (1988). As production scaled drastically in 1989 and 1990, numbers quickly climbed past the 150,000 mark.

When ordering parts from Korg (or third-party vendors like Syntaur or Instrumental Parts), you need your serial number to determine which revision of a part you have.

Certain components, such as the tactile switches that often become flaky and unresponsive , may have slight variations in later models.