Lcd Section - Panasonic KX-FG2452CX Service Manual

KX-FG2452CX

6.12. 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, R311 and R312 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)
XL14 (IC301-20pin)
XL15 (IC301-21pin)
1 line (X1.5) LED1
XL14
XL15
Density Normal
Hi-Z
Hi-Z
Hi-Z
48
Dark
H L
L
L L
H H
Hi-Z
L