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Document no. M1137266-02
5 Set/Test
The power supply unit contains a watchdog circuitry,
which needs refreshment at every 1.5 seconds. If the
refreshment did not occur, the watchdog circuitry
will reset the main CPU. In normal operation, the
main CPU refreshes the watchdog circuitry at every
0.2 seconds.
The purpose of the watchdog circuitry is to restart
the monitor, if there was a serious malfunction. This
feature is useful in two cases: when the main CPU is
not able to control the monitor, or when the CPU
controls the monitor but detects a serious
malfunction. Watchdog tests check the proper
functionality of the watchdog circuitry in various
conditions.
Watchdog test ensures directly that the watchdog
of the power unit functions properly. Choosing this
test prevents the watchdog circuitry from refreshing
and shows running seconds with an accuracy of
0.1 seconds.
The test should have the following result when the watchdog circuitry is working properly: The monitor will
restart after 1.5 seconds from the start of the test. In malfunction: ‘>20 s’ is displayed, and the test will be
interrupted. In this case, the fault is in the watchdog circuitry of the power unit.
WD by Overload test ensures the functionality of a feature, where the software controls the monitor, but
detects an overload situation in the main CPU.
The test should have the following result when the feature is working properly: The monitor will restart after 15
seconds from the start of the test.
WD by UPI test ensures the functionality of a feature, where the software controls the monitor, but detects a
malfunction in the UPI processor and restarts the UPI4(NET) board. The test will prevent the UPI processor from
functioning during the test.
The test should have the following result when the feature is working properly: The monitor will restart the
UPI4(NET) board without any visual effects.
WD by GSP No function.
Factory Reset restore factory default settings and clear data memories. Factory reset should be run if monitor
software is replaced or if the SRAM/Timekeeper battery is replaced.
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