• Code: 4200
• Description: laser output error
  • The pin photo signal (PDN) is not output within a specified time after the polygon motor ready signal (MOTRDYN) becomes ready (L level).

• Code: 6000
• Description: fixing heater lamp/fixing thermistor error
  • The fixing thermistor disconnection detection circuit in the engine/high voltage PWB outputs the disconnection detection signal (THDEAD) to the CPU more than a specified time after power is turned on. • The fixing temperature does not rise at least 1 °C when the fixing heater lamp is continuously on for approximately 20 seconds during printer warm-up or in the standby mode. • The fixing temperature does not rise at least 1 °Cwhen the fixing heater lamp is continuously on for approximately 15 seconds during printing. • The fixing temperature does not lower when the fixing heater lamp is off for a specified time or more. * The fixing temperature is the average value calculated using the input voltage from the fixing thermistor detected several times in a specified time to avoid influence of noise and so on.

• Code: 6020
• Description: abnormally high fixing temperature error
  • The fixing heater lamp runaway protection circuit in the engine/high voltage PWB outputs continuously the abnormally high temperature detection signal (HTEMPN) to the CPU for a longer time than specified.

• Code: 6400
• Description: fixing heater lamp control zero-cross signal detection error
  • The zero-cross signal (ZCROSS) that is output from the power source PWB and input to the CPU on the engine/high voltage PWB is not input for a specified time.

• Code: F0
• Description: communication error between the operation panel PWB and main PWB
  • Serial communication between the operation panel PWB and the main PWB malfunctions.{

• Code: F010
• Description: code ROM checksum error
  • Checksum of the code ROM PWB attached to the socket (YS1) on the main PWB malfunctions.

• Code: F020
• Description: main PWB RAM checksum errorion error
  Checksum in the standard RAM mounted on the main PWB or in optional expansion memory is not correct. {

• Code: F030
• Description: main PWB controller errororion error
  • The controller (CPU) on the main PWB malfunctions.