- Turn the ON-OFF switch to ON.
- The Drumulator automatically runs two self-tests:
- All LED's will light up briefly.
- A memory integrity test runs.
- If the display reads 'bAd', there is a memory problem (bad battery, parts failure). Turn the Drumulator off, wait 10 seconds, and turn on again. If 'bAd' persists, clear memory (Section 2M) or contact service.
Source: Drumulator — emu-drumulator-owners-manual (manual)