2 Instrument Configuration
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Loading problems with the FPGA program
The FPGA program is loaded from the serial port FLASH. A successful loading of the FPGA will
cause the indicator light D90 to flash. If D90 is not lit up, it means that FPGA program has not
loaded. The location of D90 is shown in Figure 2-45.
Figure 2-45 Indicator of FPGA working status
1 - FPGA status indicator light
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Counting abnormalities
There are many causes that lead to counting abnormalities, and they can include problems with
main control panel problem. Counting abnormalities caused by main control panel problems
usually involve counting results of zero or overly high counting results on multiple occasions. A
counting result of zero usually results from a failure to apply the CC source to the counting bath,
while an overly high counting result is usually caused by too much noise in the analog-channel
circuit.
2.3.1.6 Maintenance of the Main Control Panel
The maintenance of the main control panel mostly deals with problems not related to connections. In
theory, only designated maintenance professionals are allowed to perform the maintenance steps for
the main control panel. Please replace the main control panel if any non-connection problems occur.
This section will introduce the location of fault of the main control panel, as well as common faults
and solutions in repairing the main control panel. The instructions above only apply to designated
maintenance professionals.
Locating Main Control Panel Problems
Successful troubleshooting is a precondition of maintenance. Main control panel problems mostly
involve the power supply. As for functional problems, there is no real value in maintenance and the
main control panel should therefore be replaced at your earliest convenience.
There are four steps in locating power-related problems:
1. Look. Power on the panel and pay attention to the power indicator lights. If any abnormality is
spot
ted, then there is something wrong with the loading of the indicator light’s corresponding
power source. Light abnormality here refers to situations in which a light is off or dimmer than
normal.
