Brother MFC-9420CN, Руководство по обслуживанию

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Confidential 3 - 2 7
<Layout & Function of the Electrical Parts>
(1) Print PCB (Refer to Fig. 3-29.)
No. Name Function
1 Engine Controller
Board PU
(MCTL P.W.B.)
To control the series of processes of the Machine: 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 machine'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 Machine with the power supply for the
machine control.
8 HV Power Supply PU
(High Voltage Power
Supply Unit (HVU))
To provide the machine 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.
10 NCU PCB
To relay the signals between the telephone line (primary
side) and video controller PCB (secondary side).
Fig. 3-29
1. Engine Controller
Board PU
(MCTL P.W.B.)
2. Panel ASSY PU
3. LDU P.W.B.
4. PDU P.W.B.
5. Erase Lamp PU
6. I/O Board PU
(IOD P.W.B.)
7. LV Power Supply PU
(DC Power Supply Unit) (LVPS)
8. HV Power Supply PU
(High Voltage Power
Supply Unit (HVU))
9. Video Controller
PCB
10. NCU PCB