KX-TCA285RU - Panasonic Telephone Service Manual (repair manual). Page 11

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11
KX-TCA285RU
4.2.9.
LED Circuit
• DPU(IC100) controls each LEDs.
4.2.10.
Vib Circuit
• Vibrator is controlled by IC1-23 pin.
Type of LED
LED ON
LED OFF
Bell LED (Green)
LED531
IC401-7pin = High
IC401-7pin = Low
Bell LED (RED)
LED530
IC401-5pin = High
IC401-5pin = Low
Key back-light LEDs (Yellow green)
LED520 - LED529
IC401-3pin = High
(Q521 = ON)
IC401-3pin = Low
(Q521 = OFF)
VIB ON
VIB OFF
IC1-23 pin (Q540)
 High
(ON)
Low
(OFF)
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