• Code: 937.40 ... 937.81
• Description: 937.40 Main drive motor assembly failure Over speed detected during speed control. Motor = type 0 937.41 Main drive motor assembly failure Over speed detected during speed control. Motor = type 1 937.50 Main drive motor assembly failure Over speed detected during position control. Motor = type 0 937.51 Main drive motor assembly failure Over speed detected during position control. Motor = type 1 937.70 Main drive motor assembly failure Loss of lock detected by higher-level code. Motor = type 0 937.71 Main drive motor assembly failure Loss of lock detected by higher-level code. Motor = type 1 937.80 Main drive motor assembly failure Driver over temp detection. Motor = type 0 937.81 Main drive motor assembly failure Driver over temp detection. Motor = type 1
• Remedy: 1. Check all connections on the system card assembly. 2. Check all connections on the main drive motor assembly. 3. Replace the main drive motor assembly. Go to “Main drive motor assembly removal (X651, X652, X654, X656, and X658)”. 4. Replace the system card assembly if problem remains. Go to “System card assembly removal (X651, X652, X654, X656, and X658)”.

• Code: 950.xx
• Description: NVRAM mismatch failure Mismatch between system card EEPROM and operator panel mirror. ".xx" codes: 00-29: mismatch between system and mirror 30-60: mismatch between secure and system
• Remedy: Warning: When replacing any of the following components: • Operator panel assembly • System card assembly Only replace one component at a time. Replace the required component and perform a POR before replacing a second component listed above. If this procedure is not followed, the printer will be rendered inoperable. Never replace two or more of the components listed above without a POR after installing each one or the printer will be rendered inoperable. Never install and remove components listed above as a method of troubleshooting components. Once a component has been installed in a machine, it can not be used in another machine. It must be returned to the manufacturer. Go to NVRAM mismatch failure service check.
  1 Check the operator panel assembly. Was the operator panel assembly recently replaced? Go to step 3. Go to step 2. 2 Check the system card assembly. Was the system card assembly recently replaced? Go to step 4. Contact next level of support. 3 Replace the current operator panel assembly with the original operator panel assembly. Does the error remain? Go to step 5. Problem solved. 4 Replace the current system card assembly with the original system card assembly. Go to “System card assembly removal (X651, X652, X654, X656, and X658)”. Go to step 6. Problem solved. 5 If problem continues, replace the original operator panel assembly with a new and not previously installed operator panel assembly. Does the error continue? Contact the next level of support. Problem solved. 6 If the problem continues, replace the original panel assembly with a new ann not previously installed operator panel door assembly or the operator panel assembly. Go to “Operator panel door assembly removal (models X651, X652, X654, and X656)”. Go to “Operator panel assembly removal (model X658)”. Contact the next level of support. Problem solved.

• Code: 951.xx
• Description: NVRAM failure The secure NVRAM on the system card has failed. ".yy" codes: 00: error detected in zkernal 01: error detected in NV2 02: error during initialization in zkernal trying to blow CMA fuse
• Remedy: Replace the system card assembly.

• Code: 952.xx
• Description: NVRAM failure A recoverable MVRAM Cyclic Redundancy Check (CRC) error occurred.
• Remedy: Power the machine off/on to reset the error condition.

• Code: 953.xx
• Description: NVRAM failure The NVRAM chip has failed on the operator panel door assembly.
• Remedy: Replace the operator panel door assembly.

• Code: 954.xx
• Description: NVRAM failure NVRAM chip failure with system card assembly.
• Remedy: Replace the system card assembly.

• Code: 955.xx
• Description: NVRAM failure The Code ROM or NAND flash failed the Cyclic Redundancy Check (CRC) check or the NAND experienced an uncorrectible multi-bit failure.
• Remedy: Replace the system card assembly.

• Code: 956.01
• Description: System card processor over temperature The system card processor is over temperature or is damaged.
• Remedy: Replace the system card assembly.