• Code: F050
• Description: Print engine ROM checksum error
• Causes: Defective engine software. 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: F278
• Description: Power supply in drive system error
• Causes: The main power switch was turned off before the machine was shutdown, or a power failure has occurred.
• Remedy: Turn on power. (To switch off power, after confirming the data lamp is turned off, perform shut-down on the operation panel, turn power off.)