13.7 OVERHEAT PROTECTION
If the hot roller temperature stays higher than 230
°
C for 5 seconds, the CPU
cuts off the power to the fusing lamps. At the same time, E-543 lights on the
operation panel.
Even if the thermistor overheat protection fails, thermofuses are installed in
series with the common ground line of the fusing lamps. If the temperature of
either thermofuse reaches 169
°
C, the thermofuse opens, removing power
from the fusing lamps. At the same time, the copier stops operating.
13.8 ENERGY SAVER FUNCTIONS
When the copier is not in use, the energy saver function reduces power
consumption by decreasing the fusing temperature.
If the auto energy saver mode timer (SP5-102) runs out, the copier
automatically enters energy saver mode. The fusing lamp switches off until
the lamp reaches the temperature selected with SP1-105-002. The lower this
temperature is, the longer the waiting time until the copier returns to the
ready condition.
Also, when the Energy Saver/Clear Mode key is held down for over 1 s, the
copier goes into the energy saver mode. The Energy Saver indicator turns
on and all the other indicators turn off.
There is also an auto-off timer that can be programmed with SP5-305. If this
timer expires, the machine cuts all power to the fusing unit.
The copier returns to the ready condition if someone stands at the front of
the copier (in other words, when the Auto Response sensor is activated).
13.9 MAIN FUSING LAMP INTERCHANGEABILITY
The main fusing lamp for the FT4022/4522 (A161/A162) is different from that
of the FT4027/4527 (A157/A160). The total span of all the filaments has
been expanded for the FT4022/4522 (A161/A162) copier to compensate for
the difference in the copies per minute and the warm-up time.
There is more overlap of the main and secondary fusing lamp filaments in
the FT4022/4527 (A161/A162) compared with the FT4027/4527
(A157/A160) copier. This allows a faster heat up time around the edges of
the hot roller.
To distinguish between the two types of lamp, the lamp connector color at
the front side is different.
FT4022/4527 A161/A162 - Blue
FT4027/4527 A157/A160 - White
NOTE: If an FT4022/4522(A161/A162) lamp is installed in a FT4027/4527
(A157/A160) copier, faster warm-up may be achieved, but fusing
problems may occur during multi-copy runs due to a lack of heat for
the higher copy speed.
The secondary fusing lamp is the same as for the base copier.
Rev. 7/95
Detailed
Descriptions
STM 2-111 A156/A160/A162
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