A-76
I n t e l l i T o u c h / S e c u r e T o u c h G u i d e
Transient Protection Components
The transient suppression diodes behave like ordinary diodes when checked
with most ohmmeters. These components normally fail by shorting. See the
following figure for a circuit diagram:
Figure A.3
Transient Protection Circuit
Diagnostic LEDs
Depending on where the controller is installed, the LEDs may or may not be
visible.
2210 Serial Controller
The E271-2210 serial controller has one yellow diagnostic LED. Following
power on, the controller performs its self-test. (ELODEV displays the result of
this test when the loaded.) After the self-test, the LED flashes about 1.5 times a
second, indicating normal operation.
During normal operation, the LED also indicates controller/host communication
is in progress. For example, when the touchscreen is touched, the LED should
be on or flicker, then return to the normal blink rate when the touch is removed.
If the host does not remove the packet from the controller, the LED will stay on.
If the LED stays on without a touch, the touchscreen or cabling may be shorted.
Disconnect the touchscreen cable from the controller and cycle power to the
controller. If the problem persists, a fault in the power supply is likely.
If the LED flashes about four times a second, a warning error condition is
indicated, such as improper communication from the host. The baud rate or
other communication parameters may be suspect.
Summary of Contents for AccuTouch 821615-000
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