Read Panasonic KX-UT113RU / KX-UT113RU-B / KX-UT123RU / KX-UT123RU-B (serv.man3) Service Manual online
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KX-UT113RU/KX-UT113RU-B/KX-UT123RU/KX-UT123RU-B
4.2.
Circuit Operations
4.2.1.
LCD Circuit
LCD data are output from pin M3 of IC501 to LCD module.
LCD contrast is set by electronic volume in LCD module.
+3.3V of the power supply voltage is pressurized about four/three times in the LCD module and used as LCD driving voltage
(approx. 10.0V).
The driving voltage is observed between Pin 12 (V0) and Pin 13(XV0) of CN504.
LCD contrast is set by electronic volume in LCD module.
+3.3V of the power supply voltage is pressurized about four/three times in the LCD module and used as LCD driving voltage
(approx. 10.0V).
The driving voltage is observed between Pin 12 (V0) and Pin 13(XV0) of CN504.
The lighting of the backlight is controlled by Q503(KX-UT123 only).
The PWM (Pulse Width Modulation) signal is output from IC501-B8 pin and the brightness is changed according to its duty ratio.
The PWM (Pulse Width Modulation) signal is output from IC501-B8 pin and the brightness is changed according to its duty ratio.
4.2.2.
Reset Circuit
Reset Signal is output from IC505 and input into IC501-pin L3.
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