TA15 is tested for CH1 output waveform. In the case of abnormal display of
channel 1 on the oscilloscope screen, if the tested voltage is within the spec
range, then the failure results from analog channel. Otherwise, the failure may
result from FPGA.
TA16 is tested for CH2 output waveform. In the case of abnormal display of
channel 2 on the oscilloscope screen, if the tested voltage is within the spec
range, then the failure results from analog channel. Otherwise, the failure may
result from FPGA.
T4 is the mainboard clock signal. Please test its frequency using an
oscilloscope. If the tested frequency is not 25MHz, the mainboard clock proves
to be faulted.
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