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KX-T7735X, KX-T7735X-B - Panasonic PBX Service Manual (repair manual). Page 10

Read Panasonic KX-T7735X / KX-T7735X-B Service Manual online

8 CIRCUIT OPERATIONS
8.1. KEY INPUT CONTROL CIRCUIT
Sequential input information is executed by dynamic scanning.
The ports R20~R23, R30, R31 of IC1 are brought to high status consecutively.
If a key is pressed, the key-in information input is executed by ports R00~R03, R10~R13, RA0, RA1.
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