Sonoscape S30 - KEAA Board; Key Panel

22 Service Manual
3 Principle Descriptions
3.2.9 KEAA Board
KEAA board is a conversion board for internal signal and a drive circuit for speaker.
J25
To
Auodio
J21
To
Foot
Switch
J24 Audio Input
J23 To PC Main Board
J29 To KBD J20 Power Supply : +5V/+12V
J1 FanJ22 Print Control
J28
To
LCD
J27
To
Drive
J26
Power
Input
Figure 3-10 KEAA Board Diagram
3.2.10 Key Panel
Key panel is a ergonomic platform, used to scan keys, control indicators, control speaker, converse
and receive coder data, TGC data and PS/2 data, communicate with the main unit through serial port.
TGC
Coder
LED Control
PC Keyboard
Functional Keys
Touch-Screen
System
RS232
Key Panel
System Block Diagram
AD Acquisition
Knob Control
Status Control
PC Keyboard Control
Key Control
MCU
(NXP1764)
Figure 3-11 Key Panel Diagram