Toshiba e-STUDIO453 Service Manual page 118

(3) System diagram
Signals flowing between the control panel and the system 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 System board through the serial data. The state of the equipment and the mes-
sages from the System 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 System control PC board. The
control methods of the LED and buzzers differ depending on the model:
5
e-STUDIO350/450:
e-STUDIO352/353/452/453: They are switched to ON/OFF with the signals output from the panel pro-
e-STUDIO350/352/353/450/452/453
CONTROL PANEL
They are switched to ON/OFF with the control signals from the System
control PC board.
cessing CPU, based on serial data transmitted from the System control
PC board.
System control PC board
Power ON/OFF
Reset signals
LCD
controller
Serial data
LED scan signal
LED serial output
Buzzer ON signal
Fig. 5-403
5 - 10
07/11
Control panel
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-STUDIO352/353/452/453
LED driver
LED
Buzzer
e-STUDIO350/450
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