To prevent excessive edge temperature rise when printing small size paper, the light-up pattern of the center/edge heaters and shield plate position are changed depending on the paper size.
[A]: Fusing lamp (center/edge)
[B]: Shield
Basic operation
After paper feed begins, depending on the rise of edge temperature (Pressure roller thermistor (Full-bleed edge/Edge)), the shield is moved to a suitable position. The shield has 9 positions including the home position.
Depending on the unit temperature and continuous paper feed time, the edge heater is switched ON/OFF, and the shielding is adjusted.
Shield drive
The shield is driven by a shield drive motor (M28) on the machine.
[A]: Shield operating range
[B]: Shield width (large), motor cw
[C]: No shield, motor ccw
[D]: Filler
[E]: Position 8
[F]: Position 1
[G]: Home position
[H]: Shield sensor (to detect HP)
[I]: Reference edge (Reference edge is detected when the main power supply is on, when print is started, and when print is finished.)