Brother International HL-3400CN Service Manual - Page 81
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UPC - 012502526223
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CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS (1) Print PCB (Refer to Fig. 4-29.) No. Name Function To receive the print data from the host computer, 1 Video controller PCB convert it into image data and then send the printing image data to the MCTL PWB. To control the sequence of processes of the printer: Fusing Temperature Control, Laser Output 2 Engine controller PCB Control, Control Panel Indications, Toner Empty (MCTL PWB) Sensing Control, Error Processing Control, Interface Control. 3 Control panel PCB To display the printer's operation status and (Panel PWB) support the control panel switches. 4 LDU PCB To control the drive and output to the laser diode in the scanner unit. 5 PDU PCB To sense the emission of the laser diode and the beam position in the scanner unit. 6 Erase lamp To discharge the OPC belt with the LEDs. To send the signals from the sensors to the MCTL 7 1OO1 PWB PWB, and to drive the outputs from the MTCL PWB to the motors, clutches and solenoids. 8 1OO2 PWB - Ditto - 9 DC power supply (LVPS) PCB To provide the printer with the power for printer control. 10 High-voltage power To provide the printer with the high voltage power supply (HVU) PCB supplies necessary for the printing process. 4-30