• Code: 953.xx
• Description: NVRAM chip failure with mirror part
• Remedy: Replace the controller board.

• Code: 954.xx
• Description: NVRAM chip failure with system part
• Remedy: Replace the controller board.

• Code: 955.xx
• Description: The Code ROM or NAND flash failed the Cyclic Redundancy Check (CRC) or the NAND experienced an uncorrectable multi-bit failure
• Remedy: Replace the controller board.

• Code: 956.01
• Description: Processor Overtemp
• Remedy: Replace the controller board.

• Code: 956.xx
• Description: The flatbed scanner and ADF cannot properly communicate with the controller board in the base printer
• Remedy: Step 1 Check the cable that connects the ADF to the controller board in the printer. Is the above cable properly connected? Replace the flatbed scanner controller board. See “Flatbed scanner PCBA removal”. Replace the connection.
  Step 2 Place an undamaged document in the ADF, and perform an ADF test. Does the problem remain? Replace the ADF controller PCBA. Problem resolved.
  Step 3 Perform a print test using the ADF. Does the problem remain? Contact the next highest level of technical support. Problem resolved.

• Code: 957.xx
• Description: RIP card failure—ASIC failure
• Remedy: Replace the controller board.

• Code: 958.xx
• Description: Controller Board NAND Failure—printer has performed more than 100 shift and reflash operations as a result of ECC bit corrections.
• Remedy: Replace the controller board.

• Code: 959.01, 959.02, 959.03
• Description: 959.01 Controller verification failure of smart chip boot code 959.02 Failure to authenticate Signature Verification Code 959.03 Signature Verification Code failed to authenticate a code partition
• Remedy: Upgrade firmware. If that fails, replace the controller board