Brother HL-2700CN Service Manual page 81

<Layout & Function of the Electrical Parts>
(1) Print PCB (Refer to Fig. 4-28.)
No. Name
Engine Controller
Board PU (MCTL
1
P.W.B.)
2 Panel Assy PU
3 LDU P.W.B.
4 PDU P.W.B.
5 Erase Lamp PU
I/O Board PU (IOD
6
P.W.B.)
LV Power Supply PU
7 (DC Power Supply
Unit) (LVPS)
HV Power Supply PU
8 (High Voltage Power
Supply Unit (HVU))
9 Video Controller PCB
2
9
Video
8
HVU
7
LVPS
To control the series of processes of the Printer:
Fuser Temperature Control, Laser Output Control,
Operator Panel Indication, Toner Empty Sensing
Control, Error Processing Control, Interface
Control.
To display the Printer's operation status and
support the manual input switch.
To control the drive and output of the laser diode
to be included in the optical unit.
To sense the emission of laser diode and also the
beam position to be included in the Optical unit.
To discharge the OPC belt by radiating the LED
beam onto the OPC belt to be included in the
Optical unit.
To relay the signals between the controlled parts
and MCTL P.W.B., and to drive the controlled
parts.
To provide the Printer with the power supply for
the printer control.
To provide the Printer with the high voltage power
supply that is necessary for the printing process.
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.
PANEL
1
MCTL
Fig.4-28
IV-28
Function
5 Erase Lamp
6
3
LDU
PDU
4
IOD