HP PageWriter XL M1705B Service Manual page 208

Table A-l.
Keyboard and Keyboard Display (LCD) Connector Jl
12 GROUND 25 LCDDATA(7)
13
+5v
26 LCDDATA(6)
Note .I
!i?
The connector listed in this table is shared by the keyboard and the
keyboard display. Pins l-11 serve the keyboard, while pins 12-26
serve the keyboard display. All of the signal lines (except ground) are
filtered before they pass through this connector.
,q
Signal
ACONLED
Definition
AC on LED. Drives the AC indicator LED on the
keyboard.
KBD RESET Keyboard controller reset.
KRX Keyboard receive--data from the CPU assembly.
KTX Keyboard transmit--data to the CPU assembly.
LCDDATA Eight data bits for keyboard LCD.
LCDE LCD Enable-active high.
LCDRS
Control that identifies data as display or instruction.
LCDRW
LCD Read/Write control-read high, write low.
nONKEY
Signal generated by COn-Standby) key-active low.
Initiates the DRAM gate array during power-up.
VLCD Contrast voltage to the keyboard display (LCD).
A-2 Connector Pin Assignments