Read Panasonic KX-T7630RU Service Manual online
7
KX-T7630RU-B
4.2.2.
LCD Circuit
LCD data are outputted from pin 57, 58, 59,10 and 12 of IC3 to LCD module.
IC8 is an inverter for a charge pump circuit which outputs the voltage necessary for LCD driving.
IC8 is an inverter for a charge pump circuit which outputs the voltage necessary for LCD driving.
• 4.5V from -1.2V generated at IC8 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 62 of IC3.
The type of the LCD module is distinguished by pin 62 of IC3.
The lighting of the backlight is controlled by Q1.
• IC3-pin 56 H
→Q1-ON→Backlight ON
• IC3-pin 56 L
→Q1-OFF→Backlight OFF
Pin 62 of IC3
L
KX-T7636
24 digits * 6 lines
H
KX-T7630/KX-T7633
24 digits * 3 lines
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