Alesis D4 Drum Module -1991

User Manual: Alesis
Reset Proceedures: N/A
Operating System code:
MIDI or other control protocol:
Software related Links:
Patches or knob settings:
Circuit Overview: below
Scematics/Service Manual:
Common Service Issues/Tips: below
Parts Sources: Keys knobs semiconductors misc
Uncommon chips/modules used: Many
General Info Links: Vintage Synth Explorer

Circuit Overview:
     The classic compact drum module with 12 pad interface plus HH trigger switch. It has worked great for me with my old SDS8 simmons drums for many years. Cymbals not so hot but other sounds are pretty good really. Well the quality is ok on some of the cymbals but the rides don't ring out long, etc. But anyway another standard ROMpler with a nice interface for the compact size.

Service Tips:
      Always verify power supply voltages if problem looks like it could remotely be power supply related. I have seen some bad solder problems and one intermittent processor reset problem that required a new board in an Alesis product. FOR RESET Hold "Voice" and "Output" while powering on. Backup data first of course.

Advanced Musical Electronics has a lot of parts for Alesis stuff. THey only deal with techs though.
I've also seen All electronics carry displays occasionally at low prices.Always feel free to ask or check my Parts
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