Epson EMP 822, Руководство по обслуживанию

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2-4
EMP-822/EMP-83/EMP-X5/EMP-S5
SEIKO EPSON Revision:A
2.2.1 Electrical Circuit Components
The components and their functions are explained below.
Component name Function
MA Board
The circuit board that controls the whole system and functions of the projector.
The main functions are listed below.
•
Digitally processes the input data from the external devices.
•
Generates the drive signals of the L/V (R/G/B).
•
Controls the external I/O interface.
•
Drives and controls the Lamp.
•
Monitors the sensors’ input and controls the internal temperature with the
fans (fan drive control).
PS Ballast
Assy.
PS Unit
Generates and supplies the DC power used in each components from the AC
input.
Ballast Unit
Generates the power supply to drive the Lamp from the DC power supplied
from the PS Unit.
SW Board
The control part of the projector located on the Upper Case. Various buttons for
each functions are mounted on the panel.
RC Board
Receives the IR signal from the remote controller. Mounted at the front and the
back of the projector.
Fans
P/S Fan
Ventilates the PS Ballast Assy.
Lamp Fan
Ventilates the Lamp.
EX Fan
Exhausts the heated air generated inside the projector to the outside.
Intake Fan A/B
Take in fresh air and ventilate the L/V.
Sensors
TH Board (Lamp
Thermistor)
The thermal detection sensor for the Lamp mounted on the Inner Exhaust Duct
around the lamp., The fans are controlled based on the detected thermal data
together with the others explained below.
The temperature around the Lamp exceeds the specified level, the “High Temp
Warning” is issued. If the temperature continues to rise, the projector issues the
“High Temp. Error” message with LED indicators and stop the Ballast Unit,
and shuts off the power supply to the Lamp.
L/V Thermistor
The thermal detection sensor for L/V mounted on the MA Board right above
the POP of the Optical Engine. The fans are controlled based on the detected
thermal data together with the others explained above and below. The tempera-
ture around the L/V exceeds the specified level, the “High Temp Warning” is
issued. If the temperature continues to rise, the projector issues the “High
Temp. Error” message with LED indicators and stop the Ballast Unit, and shuts
off the power supply to the Lamp.
P/S Thermistor
The thermal detection sensor for the PS Ballast Assy. mounted on the assembly.
The fans are controlled based on the detected thermal data together with the
ones explained below. The temperature around the P/S Ballast Assy exceeds
the specified level, the “High Temp Warning” is issued. If the temperature con-
tinues to rise, the projector issues the “High Temp. Error” message with LED
indicators and stop the Ballast Unit, and shuts off the power supply to the
Lamp.
Safety Switch
Functions as the safety device in the case of the loss of temperature control due
to the failure of the thermistors. This is a detection switch for the prevention of
overheating, and is mounted on the side of the Inner Exhaust Duct. If the inter-
nal temperature exceeds the specified level, the switch cuts off the AC power
supply. The power supply cannot be activated until the internal temperature
drops below the certain level.
Lamp Lid
Detection Switch
Detects the status of the cover for the lamp replacement. If the Lamp Lid
opens, the power supply to the Lamp is cut off. In such a case, the power sup-
ply cannot be activated.