Ricoh D009 Service Manual page 620

Image Fusing
This model has a new temperature control theory. In previous models, the target
temperature, paper feed temperature and print ready temperature are set to the same
temperature. The machine turns the fusing lamp on and off to keep this temperature.
However, after the start of a job [A], the fusing temperature goes down [D] when the first
sheet of paper [C] goes into the fusing unit while the fusing lamp is turned off [B]. In this case,
at the lowest temperature [D], the difference between an ideal fusing temperature and the
actual fusing temperature is up to 40°C. This may cause cold offset on the first output sheet
of paper.
In the D009/D011/D012/D013 models the target temperature and print ready temperature
are set to the same temperature, but the paper feed temperature is different. The machine
turns on the fusing lamp after it gets a print job [A], even if the fusing temperature is at the
target temperature or more. Because the lamp-off time [B] is shorter than previous models,
the lowest temperature [D] while feeding the first sheet of paper is kept closer to the target
D009/D011/D012/D013 6-70 SM