Accutorr Plus Service Manual 0070-10-0691 1 - 17
Theory of Operation LED and Tone Module
1.5.1 Keypad Control
Circuitry for scanning the keypad for key presses. The board scans a 3x8 matrix of keys.
In the case of simultaneous key presses, a key is recognized by the software. The other key
will not be recognized, until the initial key is released.