Brother HL-2700CN Series, Service Manual, Page: 81 / 377

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