Table 7-40. Location of PCAs 1 Engine Controller Board Sequence control, High-voltage output, DC output, and Heater Drive. 2 Paper Size Detection PCA Relay between Sensors/Solenoids and Engine Controller Board, and Paper Size Detection. 3 Paper Feeder Driver PCA Control and detection of solenoids in the Paper Feeder. 4 Envelope Feeder Driver PCA Control and detection of solenoids in the Envelope Feeder. 5 Duplexer Driver PCA Controls paper in the Duplexer. Reference Diagrams 7-101