Ricoh Aficio FT4027, Service Manual

Page: 538 / 685

10.3 FUSING LAMP CONTROL
There are two fusing lamps in the hot roller: the main fusing lamp (800 W) [A]
and the secondary fusing lamp (350 W) [B].
The main fusing lamp has a much higher wattage that the one in the base
copier, because it is the only lamp that is used during copying to control the
operating temperature of the fusing unit (185
°
C).
The secondary fusing lamp is only used in the following conditions to help
achieve a faster warm-up time.
•
When the main switch is turned on
•
When reheating the unit after exiting from the energy saver mode
The new hot roller’s metal core is thicker than the base copier’s hot roller’s.
The new roller holds heat much better, to allow multicopying at the higher
cpm of this model without the hot roller temperature dropping too far.
However, it takes a lot longer to warm up after switching on (see the
Warm-up Time in the Specifications section).
The temperature is only monitored at the center; there is only one fusing
thermistor. There is also only one thermofuse.
A204D514.wmf
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IMAGE FUSING (A204/A206/A207 COPIERS)
SM 1-35 A207/A208/A211