Oki ES3640MFP Component Replacement Manual page 95

Engine Control Board
To Yellow LED Head
To Black LED Head To Magenta LED Head
To Cyan LED Head
To Toner Sensor PCB
To Reader Control PCB
To Registration Sensor PCB
To Fiery Control PCB
To CN1 on LVPS
To Rear Sensor PCB
To Control Panel
To HVPS
To CN3 on LVPS
To Fuser
To Finisher
To Motor Driver PCB