• Code: F050
• Description: Print engine ROM checksum error
• Causes: Defective engine PWB.
• Remedy: Defective engine software. Install the engine software.
  Defective engine PWB. Turn the main power switch off/on to restart the machine. If the error is not resolved, replace engine PWB.

• Code: F051
• Description: Scanner engine ROM checksum error
• Causes: Defective ISC PWB.
• Remedy: Defective Scanner software. Install the Scanner software.
  Defective ISC PWB. Turn the main power switch off/on to restart the machine. If the error is not resolved, replace ISC PWB.

• Code: F278
• Description: Power supply in drive system error
• Causes: Main power switch was turned off without using the power key, or a power failure has occurred.
• Remedy: Turn on power. (To switch off power, first press the power key until the main power indicator goes off, then turn the main power switch off.)