Ricoh D0C8, Service Manual

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Process Control and MUSIC
D0CA/D0C9/D0C8/D0CB 7-70 SM
checks whether a new toner bottle has been set. The machine then starts the toner supply to
recover from the toner end. After supplying toner, the machine checks the toner end sensor
(S11-S13) and Vt condition and deactivates the toner end condition.
When a new PCDU is set in the machine, the machine automatically detects it and enters
the developer initial setting mode. The machine then detects the count which is an
output from the TD sensor (S14-S17) . The developer initial setting is done as follows.
1.
Starting the developer initial setting mode
The new unit detection mechanism triggers the developer initial setting mode.
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
(S14-S17) , 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 newly installing the machine)
This step is required only when the machine is newly installed because there is no toner in
the toner transport route.
When the developer initial setting is successfully completed, the machine stores the calculated
Vt as Vtref. The Vtref is used as a reference the next time the machine performs an initial
developer setting.
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 initial setting when a PCDU is
replaced.
(S27)(S28)(S29)