Service manual

9.3 FUSING UNIT
9.3.1 Fusing Temperature Control
There is a single fusing lamp in both the hot and pressure rollers (the hot
roller lamp is 670W, and the pressure roller lamp is 400W). To control fusing
temperature, thermistors [A] detect the temperature at each roller.
The fusing temperature depends on the selected mode, as shown in the
following table. Color toner and some paper types such as OHP sheets
require a higher fusing temperature. The temperature for various modes can
be adjusted with SP 1-105-1 to -8.
Standby Mode
While Copying
Normal Speed
OHP/Thick
Paper Mode
(Half Speed)
Single Color Full color
Single Color/Full
Color
Hot Roller
Temparature
150
°
140
°
150
°
150
°
Pressure Roller
Temparature
150
°
There are two types of fusing temperature control: on/off control and phase
control. The mode can be selected with SP1-104. Phase control mode
should only be selected if the user has a problem with electrical noise or
interference.
There are thermofuses [B] on the hot and pressure roller fusing lamp circuits.
If the temperature of either thermofuse reaches 167°C, the thermofuse
opens, protecting each roller from overheating.
[A]
[B]
PAPER TRANSPORT AND IMAGE FUSING
A166/A187/A189 2-126 SM
CÓPIA NÃO CONTROLADA
CÓPIA NÃO CONTROLADA