When the printer receives the Power Save command from the formatter board, the controller board turns off the FET switch in the main relay PCA and stops the supply of +24 UH. Additionally, the sensors, carousel motor, and toner cartridge motor are turned off. After the fuser cools down, all fans are also turned off. When the printer receives the “wake up” command from the formatter board, the printer leaves Power Save mode and resumes normal operation. High-voltage power supply Developer/ imaging drum bias supply Figure 45. Power Save circuit diagram EN Electrical systems 165