When a new PCDU is set in the machine, the machine automatically detects it and enters the developer initialization mode. The machine then detects the count which is an output from the TD sensor. The developer initial setting is done as follows.

  1. Starting the developer initialization
    The new unit detection mechanism triggers the developer initialization.
  2. Agitating the developer
    The machine rotates the development roller and transport coil to agitate the developer for 30 seconds.
  3. Detecting the count (initial value)
    While agitating the developer, the machine detects the output from the TD sensor, and stores this output as the initial count.
  4. Calculating Vt
    The machine calculates Vt using the difference of the current count while referring to the initial count through SP.
  5. Forced toner supply (only when installing a new machine)
    This step is required only when a new machine has just been installed, because there is no toner in the toner supply route.

When the developer initialization is successfully completed, the machine stores the calculated Vt as Vref. Then Vref is used as a reference the next time the machine performs developer initialization.

SC360-01 through -04 appears if the results of step 3 are as follows:

  • The count is equal or exceeds the threshold (6480 [counts]).
  • The count does not match the target threshold (5800 – 6380 [counts]) three times consecutively.

Process Control and MUSIC are forcibly done after developer initialization when a PCDU has been replaced.