• Code: 4,064.62
• Display: 4,064.62 PC_PROG_FAULT(0x40)
• Description: Bogus Thermal State. The thermal state value stored in non-volatile memory was not valid. This error is detected in show_thermal_state() and probably indicates a corrupt NVRAM device.

• Code: 4,128.63
• Display: 4,128.63 PC_PROG_FAULT(0x80)
• Description: Bad Command Result waiting for Fault to clear processing of a PostScript command message returned SERVICE_NEEDED while waiting go the fault state to clear. This should never happen and is flagged by pend_waiting _for_fault_to_clear() as an error.

• Code: 4,243.61
• Display: 4,243.61
• Description: Some Phaser 850 printers were built with printheads that had different set points for different print modes. If the printer sees what it believes to be an invalid set point this fault occurs. Review the print options that the user is selecting and try a different print quality mode or avoid selecting different page sources within a job. Changing the printer defaults may also help, turn off 2-sided printing, turn on the Startup Page, etc. If these work-arounds are unsuccessful, replace the printhead.

• Code: 5,001.41
• Display: 5,001.41: YA_HOME_FAIL
• Description: Drum-home sensor failure. The drum has turned a full revolution without seeing the drum-home sensor activate. Check the Y-axis encoder and I/O Left board. Note: The Phaser 840 has a separate drum-home sensor. The Phaser 850 printer’s home sensor is part of the drum-position sensor. Run the Y-axis Encoder Diagnostic Test. (Phaser 860 only)

• Code: 5,002.42
• Display: 5,002.42: YA_POS_FAIL
• Description: Y-axis position failure. The drum is not where it should be. Something is blocking the motion of the drum, the y-axis belts or motor have failed, or there is a problem with the Y-axis encoder signal. Run the Y-axis Encoder and Y-axis Geometry Tests.

• Code: 5,005.67
• Display: 5,005.67 YA_BAD_MESSAGE_IN_ HOME
• Description: Bad ITC command in home state. The YA task received a YA_CMD_INIT command or a unrecognized command while in the home state.

• Code: 5,026.61
• Display: 5,026.61 YA_NO_RENDEZVOUS_ IN_IMAGE
• Description: Missed ITC message during rendezvous. The YA task failed to receive the rendezvous message to sync the drum motion to paper path motion during transfix at the end of a print. This is probably caused by the printer unexpectedly entering a fault condition and not sending a rendezvous message.

• Code: 6,000.41
• Display: 6,000.41: XA_FAULT_MCURRENT
• Description: Indication that the motor coil(s) is open or shorted, or the X-axis motor fuse has opened. Follow the procedure "Testing motor and solenoid resistances", on page 84 of this manual. Try diagnostics to verify X-axis movement. If there is not any movement, it is propable that the fuse is defective. The fuse is located in the power control board; the whole baord should be replaced. Some Phaser 840 printers in the serial number range of B9B1372 to B9B3218 may have a problem with the Power Controller Board that will result in a fault code 6,000.41