MicroGuard®434 System — Troubleshooting Manual PN W434800 Rev D 09/19/06
8
SYSTEM SELF-TEST
The Computer and Operator’s Display Console do a Self-Test when the power is turned on or
during operation when the ”TEST” button is pressed. The Self-Test verifies that the Computer,
Display Console, cables, and all remote sensors are working properly.
TEST SEQUENCE FOR DISPLAY CONSOLE:
1. Push TEST BUTTON (T). BLACK BAR GRAPH (B) spans entire window . All lights and all
7 SEGMENT DISPLAYS turn on and the ALARM sounds. Graphic Display (GD) reads:
“This is a Test.”
2. If no Fault (problem) is found, the System will start displaying Load, Radius, Angle, etc.
3. Faults discovered during Self-Test will cause the red and yellow lights to turn on. The
Graphics Display (GD) will read: “OUT OF SERVICE.”
4. The Operator then presses and holds the TEST button causing the Fault to be identified
with a FAULT CODE NUMBER (See Section V) in the Graphics Display.
CAUSES FOR COMMUNICATION FAILURE:
A) Bad connections between the Display Console and the Computer.
B) Incorrect voltage from the Computer to the Display Console.
C) Failure of the serial Transmit/Receive IC in either the Computer, Display Console, or
Remote Bar Graph Unit.
D) Failure of the Reset IC in either the Computer or Display Console.
E) The Computer is locked up and not working.
F) The Display is locked up and not working.
FIGURE 2.0
LIQUID
CRYSTAL
DISPLAYS
B
GD
T
