How to determine whether the D board or SC board is defective?
Figure 58
Note: All SCAN CONTROL PULSES are located at pins 2, 3, 4, 6, 7, 8, 9, 13, 17, 18,
19, and 20 of connector SC20-D20. A missing waveform at one of the pins with the
exception of pins 8, 9, and 13 will cause the power LED to blink.
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