Service manual

CPU Assembly Connectors
A-3
Signal Definition
+5KBD 5 volt supply for keyboard assembly.
ACONLED AC on LED. Drives the AC indicator LED on the keyboard.
CP LCD Clock pulse.
DD0-DD3 Four data bits for keyboard LCD.
DF LCD frame inversion signal.
DOFF Signal to blank LCD (active low).
ground ground.
KEYIN0-KEYIN7 Sense lines for key contact scanning.
LOAD LCD row latch.
ONSTBY
Signal generated by key — active low.
ROWSA_0-ROWSD_0 Drive lines for key contact scanning.
ROWSA_1-ROWSD_1 Drive lines for key contact scanning.
ROWSG_0 Drive lines for key contact scanning.
VCCV Contrast control voltage.
YD LCD frame sync.
On-Standby