EN Chapter 5 Theory of operation 129
Other controls
Environmental detection
This printer is capable of detecting the ambient environment using the environment temperature
sensor (TH3). The sensor, installed on the left side of the printer, measures the air temperature.
The CPU detects the air temperature with the voltage of ENVTMP signal and recognizes the ambient
environment as one of the following three conditions:
!
Low temperature: air temperature is 17° C (63° F) or lower
!
Normal temperature: air temperature is 17° to 31° C
(63° to 88° F)
!
High temperature: air temperature is 31° C (88° F) or higher
This printer switches the temperature control for the fuser according to the ambient environment.
When the voltage of the ENVTMP signal becomes abnormally low-temperature (TH3 short) or
abnormally high-temperature (TH3 open), the CPU detects an environment temperature sensor
failure.
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