[Utah-astronomy] Ealing - Astro-physics Model 8002 drive controller

Can someone get me the heads up on how the Ealing's Astro-physics Model 8002 drive controller is intended to be used. While the toggle options "sidereal", "lunar" and "solar" are self explanatory, there is another mode "calibration". There is a calibration knob. Then there are two sets of switches to the right labeled "right ascension" and "declination", each with a setting "auto" and "manual". I assume the "auto" and "manual" options means one drive is slaved to the other? The "calibration" mode is less clear. Thanks - Kurt