182 Theory of operation ENWW
Media detection
This printer detects the media type to prevent a fuser defect.
The DC controller controls the media sensor (PS5) for this detection.
The PS5 has a light emitter (LED) and a light receiver (CMOS sensor). The light from the emitter is
reflected off the media surface and received at the receiver.
The DC controller turns on the PS5 when a fed sheet passes through the registration roller, then
detects the roughness of media surface according to the patterns (luminance distribution within a
specified area) of the detected light by the CMOS sensor. Based on the detected roughness, the
DC controller identifies the media type (normal paper, gloss paper, gloss film, or OHT) and sends
the media type to the formatter.
The DC controller changes the paper feed speed according to the detected media type, when the
detected media does not match the selected print mode. (See Feed speed control, earlier in this
chapter, for feed speed change.)
Figure 5-60 Media detection
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