Intermec EasyCoder 601 XP Service Manual page 16

2.2 Keyboard/Display,
cont'd.
Intermec EasyCoder 601 XP – Service Manual Ed. 2
The keyboard/display assy. consists of a plate with two brackets, a
self-adhesive membrane switch keyboard, an self-adhesive over-
lay, and a console pcb. The membrane switch keyboard is con-
nected to P2 on the console pcb. via a semi-transparent cable
running through a slot in the plate.
Overlay
Keyboard Overlay
The keyboard overlay is self-adhesive with a non-permanent
adhesive, to allow easy replacement. Custom-made overlays could
also be printed and used to replace the standard overlays for
customized applications or in areas, where the English text is not
acceptable. Pulling away an overlay and replacing it with another
is a simple operation that the customer easily can perform himself.
Use isopropyl alcohol to remove any adhesive residue.
Keyboard
The keyboard is of membrane switch type and is glued to the
keyboard plate. There are 54 switches, but only 23 of these are used
in EasyCoder 601 XP. One switch is a Shift key, that provides a dual
functionality to each of the other keys. A resistor ladder gives
different voltages from each line and column on the keyboard so the
slave processor on the console pcb can decode signals from the
various switches (keys) by means of an A/D converter.
Keyboard Plate
The keyboard plate keeps the assembly together and to affix it in the
cavity of the front moulding. There are one slot for the display and
another for the cable running from the membrane-switch keyboard
to the console pcb. Two brackets at the lower edge are used to
connect the plate to the front moulding using two 2 mm hexagon
grub screws.
Chapter 2 Front and Keyboard
Keyboard Plate
Membrane-switch Keyboard
Console pcb.
15