Table of Contents
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Chapter 2
Functional Overview
Top Assembly
LCD Screen
The LCD power supply produces the high voltage for the LCD backlight and the contrast voltage.
The ECG signals are stored in a video RAM and the LCD controller converts the data to the
proper form for the LCD screen.
Alphanumerical Keyboard
The keyboard is a matrix style circuit which is periodically scanned by the processor via the
keyboard interface circuit. It is an integral part of the top assembly and can not be individually
replaced.
Page 2.8
SCHILLER AT-2plus 6-Channel ECG Unit
SERVICE HANDBOOK Issue 1 June 1998
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