7.3. LED CIRCUIT
1) Circuit Operation
The LED executes dynamic lighting for the status indicators, and control is executed by the output
ports C0 to C5 (column) and R0 to R9 of IC1.
A fixed pulse (T=1.82 msec) is output continuously from the/SCK1 terminal of IC9. This pulse is
counted and the output of IC1 is shifted sequentially from C0 to C5.
R0 to R7 of IC1 also output pulses, and the lighting of the LED is controlled by the timing of the output
ports C0 to C5.
16
Содержание KX-T7453
Страница 7: ...5 IC DATA 5 1 IC1 7 ...
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Страница 21: ...The reset signal is negledted 21 ...
Страница 26: ...8 2 THE LCD DOES NOT OPERATE 26 ...
Страница 28: ...8 5 SPEAKER PHONE TROUBLE 8 6 TONE DIAL TROUBLE 8 7 HANDSET TROUBLE 28 ...
Страница 29: ...9 TERMINAL GUIDE OF ICS TRANSISTORS AND DIODES 29 ...
Страница 33: ...13 ACCESSORIES AND PACKING MATERIALS 33 ...
Страница 34: ...14 REPLACEMENT PARTS LIST Note 1 The marking RTL indicates that the Retention Time is limited for this item 34 ...
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Страница 48: ...1 5 2 6 3 7 4 8 ...
Страница 49: ...9 13 10 14 11 15 12 16 ...
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Страница 51: ...33 34 35 36 25 32 ...
Страница 57: ...SW301 CN301 1 2 3 ...