Read Panasonic KX-DT343RU Service Manual online
7
KX-DT343RU/KX-DT343RU-B
4.2.2.
LCD Circuit
LCD data are outputted from pin 37, 38, 39, 53, 54 of IC1 to LCD module.
IC9 is an inverter for a charge pump circuit which outputs the voltage necessary for LCD driving.
IC9 is an inverter for a charge pump circuit which outputs the voltage necessary for LCD driving.
• 4.5V from -1.2V generated at IC9 as a reference to +3.3V of the power supply voltage is pressurized four times in the LCD mod-
ule and used as LCD driving voltage (approx. 18V).
LCD contrast is set by electronic volume in the LCD module.
The type of the LCD module is distinguished by pin 38 of IC1.
KX-DT343 uses a 24 digits x 3 Lines LCD.
The type of the LCD module is distinguished by pin 38 of IC1.
KX-DT343 uses a 24 digits x 3 Lines LCD.
The lighting of the backlight is controlled by Q601.
• IC1-pin 35 H
→Q601-ON→Backlight ON
• IC1-pin 35 L
→Q601-OFF→Backlight OFF
Click on the first or last page to see other KX-DT343RU service manuals if exist.