When the MA5600 SCU main control board starts to load, what is the status of the RUN light?

Question

Options

• A1 second on and 1 second off, periodic flashing
• B0.25 second on, 0.25 second off, periodic flashing
• C0.5 seconds on and 0.5 seconds off, flashing periodically
• D2 seconds on and 2 seconds off, periodic flashing

• A
  5% (1)
• B
  85% (17)
• C
  5% (1)
• D
  5% (1)

Explanation

Option B is correct because during the loading phase of the MA5600 SCU main control board, the RUN indicator flashes rapidly at 0.25 second on / 0.25 second off - this fast blinking signals that the board is actively booting and loading its software. Options A (1s), C (0.5s), and D (2s) describe slower flash rates that correspond to other operational states: slower rates typically indicate a running/normal state or a fault condition, not active loading. The key distinction is that faster flashing = active loading, while slower patterns indicate post-boot states.

Memory tip: Think "loading = urgent/fast" - a 0.25s flash is the quickest of the four options, matching the urgency of the board initializing. If you remember that loading = the fastest blink rate among the choices, you'll always pick B.

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