Practice question

When testing a Type 16 MMU on the bench, the recommended way to verify a programmed conflict pair is to:

  1. Apply field voltage simultaneously to the two channels' green inputs and confirm the MMU outputs a fault and forces flash
  2. Disconnect the MMU's AC power and look for an LED
  3. Pull the controller from the cabinet and rely on the controller diagnostics
  4. Re-energize the BBS

Answer: A — Apply field voltage simultaneously to the two channels' green inputs and confirm the MMU outputs a fault and forces flash

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