Brother HL-3450CN Series, Service Manual

Page: 83 / 365

CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS
4-30
<Layout & Function of the Electrical Parts>
(1) Print PCB (Refer to Fig. 4-29.)
No. Name Function
1 Video controller PCB
To receive the print data from the host computer,
convert it into image data and then send the
printing image data to the MCTL PWB.
2 Engine controller PCB
(MCTL PWB)
To control the sequence of processes of the
printer: Fusing Temperature Control, Laser Output
Control, Control Panel Indications, Toner Empty
Sensing Control, Error Processing Control,
Interface Control.
3
Control panel PCB
(Panel PWB)
To display the printer’s operation status and
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.
7 IOD1 PWB
To send the signals from the sensors to the MCTL
PWB, and to drive the outputs from the MTCL
PWB to the motors, clutches and solenoids.
8 IOD2 PWB - Ditto -
9
DC power supply
(LVPS) PCB
To provide the printer with the power for printer
control.
10
High-voltage power
supply (HVU) PCB
To provide the printer with the high voltage power
supplies necessary for the printing process.