Lcd Section - Panasonic KX-FC971CX-S Service Manual

8.10. LCD SECTION

The Gate Array (IC301) works only for writing the ASCII code from the data bus (D4~D7). V0 is supplied for the crystal drive.
R303, R305, R306 and R307 are density control resistors.
Consequently, in this unit, the timing (positive clock) is generated by the LCD interface circuitry in the gate array (IC301).
DIsplay mode
2 lines (X1. 0) LED1 (IC1-22pin)
LED15 (IC1-21pin)
LED14 (IC1-20pin)
X1. 5 LED1
LED15
LED14
Density Normal
H
L
Hi-Z
H
Hi-Z
Hi-Z
165
KX-FC971CX-S / KX-FGA521CX-S
Dark
L
L
L
H
L
Hi-Z