Key Input Control Circuit - Panasonic KX-T7636 Service Manual

Note:
Refer to (9) of WAVEFORM () for waveform.
8.7. OPTION DOES NOT WORK
9. BLOCK DIAGRAM
10. CIRCUIT OPERATIONS

10.1. KEY INPUT CONTROL CIRCUIT

The key data is under the matrix control by 19 to 23, 25, 44, 45(KEYOUT) and 28 to 35(KEYIN) of
IC3.
The key information outputted from KEYOUT is inputted into KEYIN, when the key is pressed.