Gestetner G060 Service Manual page 289

FUSING
6.8.6 NEW FUSING UNIT DETECTION
[B]
[A]
G060D506.WMF
The new fusing unit contains a spring [A] as part of a circuit connected to the BCU.
After a new unit has been installed in the machine and the fusing pressure roller is
driven for the first time, a pin [B] on the fusing pressure roller picks off the spring
and the looped wire circuit opens.
When the power is turned on or the left cover is closed, the BCU checks whether
the looped wire circuit is open or closed. If the fusing unit has just been replaced,
the circuit is still closed, and the machine detects the new unit. It then automatically
resets the counter for the unit.
The fusing unit's life is detected by counting the number of prints made. The
machine indicates near-end 2,500 sheets before the life of the unit runs out. This
timing can be changed with SP7-905-7.
SM 6-59 G060