43 pages of Maestro Echoplex schematics and info. Covers operation of units and head  adjustments.  Schematics for many units including EM-1, EP-1, EP-2, EP-3, EP-4, Sireko SE-1.  Many schematics notated by serial number range which makes it easy to find the exact sheet you need.  Several pages of factory bulletins included.  Currently only available as a PDF. If you would like a bound hardcopy sent to you, please email for more info.