• Code: 940.0x
• Description: Service Cyan TMC Sensor
  The cyan cartridge toner meter cycle(TMC) switch error.
• Remedy: 1 Remove the toner cartridge, and inspect the lenses on the toner meter cycle (TMC) card. Are the lenses blocked, damaged, or dirty? Repair or replace the TMC card. See “Toner meter cycle (TMC) card removal”. Go to step 2.
  2 Turn the printer off, and remove the rear shield. See “Rear shield removal”. Turn the printer on, and measure the values below at JCTM1 during POR: Are any of the values incorrect? Replace the controller board. See “Controller board removal”. Replace the TMC card. See “Toner meter cycle (TMC) card removal”.

• Code: 940.xx
• Description: Service LV Power Supply
  A RIP to engine communication failure.The zero crossing signal used for fuser control in the low-voltage (LV) powersupply has failed, or the wrong low-voltage power supply has been installed.
• Remedy: Replace the low-voltage power supply.

• Code: 941.0x
• Description: Service Magenta TMC Sensor
  The magenta cartridge toner meter cycle (TMC) switch error.
• Remedy: 1 Remove the toner cartridge, and inspect the lenses on the toner meter cycle (TMC) card. Are the lenses blocked, damaged, or dirty? Repair or replace the TMC card. See “Toner meter cycle (TMC) card removal”. Go to step 2.
  2 Turn the printer off, and remove the rear shield. See “Rear shield removal”. Turn the printer on, and measure the values below at JCTM1 during POR: Are any of the values incorrect? Replace the controller board. See “Controller board removal”. Replace the TMC card. See “Toner meter cycle (TMC) card removal”.

• Code: 942.0x
• Description: Service Yellow TMC Sensor
  The yellow cartridge toner meter cycle (TMC) switch error.
• Remedy: 1 Remove the toner cartridge, and inspect the lenses on the toner meter cycle (TMC) card. Are the lenses blocked, damaged, or dirty? Repair or replace the TMC card. See “Toner meter cycle (TMC) card removal”. Go to step 2.
  2 Turn the printer off, and remove the rear shield. See “Rear shield removal”. Turn the printer on, and measure the values below at JCTM1 during POR: Are any of the values incorrect? Replace the controller board. See “Controller board removal”. Replace the TMC card. See “Toner meter cycle (TMC) card removal”.

• Code: 943.0x
• Description: Service Black TMC Sensor
  The black cartridge toner meter cycle (TMC) switch error.
• Remedy: 1 Remove the toner cartridge, and inspect the lenses on the toner meter cycle (TMC) card. Are the lenses blocked, damaged, or dirty? Repair or replace the TMC card. See “Toner meter cycle (TMC) card removal”. Go to step 2.
  2 Turn the printer off, and remove the rear shield. See “Rear shield removal”. Turn the printer on, and measure the values below at JCTM1 during POR: Are any of the values incorrect? Replace the controller board. See “Controller board removal”. Replace the TMC card. See “Toner meter cycle (TMC) card removal”.

• Code: 948.xx
• Description: Service Engine Card
  The pel clock check failed.
• Remedy: If this error message persists, replace the controller board.

• Code: 949.xx
• Description: Service Engine Card
  Delay line calibration failure
• Remedy: If this error message persists, replace the controller board

• Code: 950.xx
• Description: Service NVRAM Failure
  There is a mismatch between controller EEPROM and mirror.
  • 950.00 through 950.29 codes: mismatch between controller and mirror
  • 950.30 through 950.60 codes:mismatch between secure and controller
• Remedy: 1 Have any updates been made to the firmware? Reload the firmware and try again. Go to step 2. Replace the controller board with a new, and not previously installed controller board. See “Controller board removal”.
  2 Did reloading the firmware correct the problem? Problem resolved. Replace the controller board with a new, and not previously installed controller board. See “Controller board removal”.