For the most accurate technical details, you can often find user-uploaded versions of these legacy documents on archival sites:
The BRU series requires the resolver to be aligned correctly with the motor poles. If the motor jitters or does not spin:
Indicates a microprocessor or internal communication failure. Sourcing Manuals and Support
The BRU-105 is obsolete. Electro-Craft stopped supporting it circa 2005. If you have physically damaged your drive or the manual cannot fix a hardware failure, consider these modern replacements that understand the same language:
Electro-Craft was acquired by . However, most BRU documentation is considered "End of Life." You will not find it on the main ElectroCraft (now a brand of Nidec) website. Search the Nidec / KB Electronics legacy support page.
maintains a library of current and legacy technical references for their newer PRO-series and legacy hardware. BRU to Ultra Drive Conversion Kit Guide | PDF - Scribd
Because these units are discontinued, finding a manual often requires visiting legacy archives or industrial surplus sites. BRU to Ultra Drive Conversion Kit Guide | PDF - Scribd
Be careful with “free manual download” sites that ask for credit card info or a subscription. The BRU 105 manual is old, but it’s not rare enough to pay for. Stick to the sources listed above.