Lcd Section - Panasonic KX-FP701ME Service Manual

6.10. 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.
R310, R312, R313 and R329 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 (IC301-22pin)
XLED15 (IC301-21pin)
XLED14 (IC301-20pin)
X1. 5 LED1
XLED15
XLED14
Density Normal
H
L
Hi-Z
H
Hi-Z
Hi-Z
49
KX-FP701ME
Dark
L
L
L
H
L
Hi-Z