Toshiba e-STUDIO200L Service Manual page 147

3) System diagram
Signals flowing between the control panel and the SYS board are indicated in the chart below.
When the panel processing CPU detects that the control panel is operated, the operational contents
are transmitted to the SYS board through the serial data. The state of the equipment and the mes-
sages from the SYS board are received by the LCD controller and then displayed on the LCD.
The LED and buzzers are switched to ON/OFF with the signals from the SYS board.
The control methods of the LED and buzzers differ depending on the model:
e-STUDIO200L/230/230L/280/280S: They are switched to ON/OFF with control signals
e-STUDIO202L/203L/232/233/232S/282/283/282S/283S:
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from the SYS board.
They are switched to ON/OFF with the signals output
from the panel processing CPU, based on serial data
transmitted from the SYS board.
SYS board Control panel
Power ON/OFF
Reset signals
LCD
controller
Serial data
LED scan signal
LED serial output
Buzzer ON signal
5 - 13
07/11
Inverter for
backlight
Contrast adjustment
circuit
LCD display
640 x 240 dots
Analog
Touch panel
input
Decoder
Panel
processing
CPU
Hard-key matrix
LED driver
LED
Buzzer
e-STUDIO202L/203L/232/233/282/283
LED driver
LED
Buzzer
e-STUDIO200L/230/230L/280/280S
e-STUDIO200L/202L/203L/230/232/233/280/282/283
5
CONTROL PANEL