CHAPTER 2 NEW FUNCTIONS
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COPYRIGHT
©
2001 CANON INC. 2000 2000 2000 2000 CANON iR8500/7200 REV.1 AUG. 2001
7.5 Preventing Overheating of the Developing Unit
The increase in the process speed could lead to overheating of the developing unit; par-
ticularly, if double-sided mode is used continuously for a long time, the heat occurring when
fixing the first side will cause the developing unit to overheat, affecting the toner and caus-
ing foggy images. To prevent overheating, the following are used:
• Addition of a development fan
• Revising the developing cylinder cover
• Using 2-speed drive of the developing cylinder
7.6 Development Fan
To prevent overheating of the developing assembly [1], the machine is equipped with a
developing fan [2] at its front (See 10.2).
7.7 Revising the Developing Cylinder Cover
The developing cylinder cover [3] is given a heat-sink shape, to promote the discharge of
heat. In addition, a heat pipe [4] is laid behind the developing cylinder cover (F02-707-01).
The heat pipe has a high degree of heat conductivity, and the air cooled by the development
fan serves to cool the front of the heat pipe, ultimately cooling the area all the way to the
rear of the machine ad the entire face of the developing cylinder cover and, thus, the devel-
oping assembly.
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