This manual provides comprehensive service schematics for the QSC A-21 and A-22 Professional Amplifiers. Designed for professional audio applications, these amplifiers are known for their robust construction and reliable performance. The schematics included are the most complete available, ensuring that technicians have access to detailed circuit diagrams for accurate servicing.

The purpose of this manual is to assist qualified service technicians in the diagnosis and repair of the QSC A-21 and A-22 amplifiers. It covers essential schematics required for understanding the internal workings of the units. By utilizing these detailed diagrams, users can efficiently identify and resolve issues, ensuring the continued optimal operation of the audio equipment.