How to determine whether the D board or SS board is defective?
Figure 61
Note: All SUSTAIN CONTROL PULSES are located at pins 3, 4, 5, 6, 7, and 8 of one
of the C (see the table above) and SS44 connectors. A missing waveform at one of the
pins with the exception of pin 4 will cause the power LED to blink.
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