Upgrading the Firmware
39
Black/White LCD Mini-Touch Panels
Upgrading the Firmware
In order to upgrade the firmware in the panel, you can either return the panel to Panja or replace the
necessary EPROM chips yourself. Standard memory on the G3 boards for the MLC series of touch
panels is 128 KB of base memory. The EPROM chips are pre-loaded with the firmware, and can be
obtained from the factory or dealer, then installed into the touch panel circuit board.
AXT-MLC EPROM Replacement
Remove the EPROMs from the AXT-MLC:
1.
Discharge the static electricity from your body by touching a grounded object.
2.
Remove the AXlink connector from the rear side of the touch panel.
3.
Flip the touch panel face down onto a soft cloth, and remove the seven Phillips-head screws
from the bottom panel. Then, gently remove the panel.
4.
Remove the Phillips-head screw located in the center of the circuit card.
5.
Gently tilt the circuit card down towards the connector side and pull backwards until you clear
the connector housing. Then, slowly rotate the circuit card backwards until you can lay it down
flat with the EPROM exposed as seen in FIG. 18. EPROMS have stickers indicating the
firmware version.
6.
Carefully remove the EPROM by inserting a Phillips screwdriver with a non-conducting flat-
blade between the EPROM and the connection site (at the notch side).
7.
Gently pry the EPROM from its connection base until it begins to loosen. Carefully pull out the
chip by either using an EPROM removal device or by gently pulling the chip from the base
(making sure to evenly pull the prongs from the socket holes).
.
FIG. 1
EPROM location on a TiltScreen touch panel
U2
B
B
U1
U
U
1
J2
1
32-pin socket
EPROM
Chip
notches
Insert the EPROM with the notches facing the correct direction. During the
replacement process, cables may be pulled from their connections and should be re-
checked to confirm they are securely connected.
