Fast, clear and useful. Important for me: the manual is in German.
Text excerpt from page 5 (click to view)
SA-HT820VP / SA-HT820VPC
1 Powering Up of the Main Unit
1.1. Checking Player with Active Subwoofer
1. This unit uses the active subwoofer to supply the power of the component, and the active subwoofer should be connected to the component to check operational conditions of the component. 2. Connect both AC power supply cords to enjoy all the features of this system. This speakers and tuner will not work unless you connect the subwoofer to a household AC outlet.
Using of Power Jig
1. If the active subwoofer is not available during to repair of the unit, use the following equipment.