Samsung Electronics
Service Manual
System Overview
3-22
3.3.3 Functional Requirements of Fixing Unit (Fuser) Handling
The fixing control depends on its fixing mechanism. And according to a paper type, a paper size, an elapsed printed
time, or the number of accumulated Printing Pages, a fixing control is different. Moreover, it may be different
according to hardware specs, which are a flicker, an inner temperature and so on.
3.3.3.1 Print Mode
There are warm-up, stand-by, printing, error and sleep mode in the print mode. Every mode is one of major
elements to decide the fixing temperature.
At the warm-up mode, the engine makes the temperature of the fixing unit rise up to the warm-up target temperature,
which is normally the same as the stand-by temperature.
At the stand-by mode, it maintains the specified temperature of the fixing unit in order to reduce the time to print
the first page.
At the printing mode, it controls the temperature of the fixing unit according to the paper type, the paper size, the
number of accumulated printing pages, the elapsed printing time and the environment index.
3.3.3.2 Paper Type
The paper type is also one of major elements to decide the temperature of the fixing unit. According to the paper
type, the temperature is different. Generally, a thick paper has higher temperature and OHP has lower temperature
than a plain paper does. The fixing unit has a different temperature according to the paper type mentioned in
3.1.2.2. Paper Type
3.3.3.3 Paper Size
If the paper width is narrow, the temperature of fuser roller does not uniformly at overall surface of the roller. So in
this case, the engine controls the interval of pick up of the paper.
But because it does not have a sensor for a paper width, it judges whether a paper width is a narrow paper by a
paper length. If it judges a current paper size is below B5, it regards as a narrow paper. Normally, if a paper size is
a narrow, the interval of pick up is lengthened according to an elapsed printing time and the number of accumulated
Printing Pages.
3.3.3.4 Accumulated Printing Pages
If more pieces of paper are printed than the specified number of the paper, the inner temperature of machine may
be saturated. In this case, the engine keeps the temperature of the fixing unit with the specified temperature. The
accumulated printing pages are cleared at the sleep mode.
3.3.3.5 Elapsed Printing Time
If the printing job is done over the fixed time, the inner temperature of machine may be saturated. In this case, the
engine keeps the temperature of the fixing unit with the specified temperature. The elapsed printing time is cleared
at the sleep mode.
