6. BLOCK DIAGRAM
7. CIRCUIT OPERATIONS
7.1. KEY INPUT CONTROL CIRCUIT
1) Circuit Operation
Sequential input information (negative logic) from the DSHS proprietary telephone is executed
by dynamic scanning.
The ports RR70 to RR73, RR80 to RR83 of IC6 are brought to low status consecutively.
If a key is pressed, the key-in information input is executed by ports R91 to R93, RB1, RB11,
RB21, RB0, RD1.
7.2. LCD CONTROL CIRCUIT
17
Содержание KX-T7456 - Digital 24 Button Speakerphone Display
Страница 4: ...4 DISASSEMBLY INSTRUCTIONS 4 1 HOW TO REMOVE THE LOWER CABINET Procedure 1 4 ...
Страница 8: ...5 IC DATA 5 1 IC1 8 ...
Страница 11: ...11 ...
Страница 15: ...15 ...
Страница 20: ...7 4 DATA COMMUNICATION CIRCUIT 1 Function 20 ...
Страница 24: ...The reset signal is negledted 24 ...
Страница 29: ...8 TROUBLESHOOTING GUIDE 8 1 NO OPERATION 8 2 THE LCD DOES NOT OPERATE 29 ...
Страница 31: ...8 5 SPEAKER PHONE TROUBLE 8 6 TONE DIAL TROUBLE 8 7 TROUBLE OF OHCA 31 ...
Страница 32: ...8 8 HANDSET TROUBLE 9 TERMINAL GUIDE OF ICS TRANSISTORS AND DIODES 32 ...
Страница 36: ...12 CABINET AND ELECTRICAL PARTS LOCATION 13 ACCESSORIES AND PACKING MATERIALS 36 ...
Страница 49: ...33 37 34 35 36 25 32 ...
Страница 55: ...SW301 CN301 1 2 3 ...
Страница 57: ...1 5 2 6 3 7 4 8 ...
Страница 58: ...9 13 10 14 11 15 12 16 ...
Страница 59: ...17 21 18 22 19 23 20 24 ...