■ Failure detection
The DC controller determines a fixing unit failure, makes the FIXING HEATER CONTROL signal inactive, releases the relay to
interrupt power supply to the fixing heater and notifies the Main Controller of a failure state when it encounters the following
conditions:
1. Start-up failure (E000)
• If the detected temperature of the thermistor is kept a specified degrees or higher for a specified period of heater start-
up during the wait period.
• If the detected temperature of the thermistor is kept a specified degrees or lower for a specified period under the heater
temperature control during the initial rotation period.
• If the detected temperature of the thermistor is kept a specified degrees or lower for a specified period under the heater
temperature control during the print period.
• If the detected temperature of the thermistor does not reach its targeted temperature within a specified period under the
heater temperature control during the initial rotation period.
2. Abnormal high temperature (E001)
• If the detected temperature of the main thermistor is kept a specified degrees or higher for a specified period.
3. Abnormal low temperature (E003)
• If the detected temperature of the thermistor is kept a specified degrees or lower for a specified period under the heater
temperature control.
4. Drive circuit failure (E004)
• If a specified frequency of the FREQUENCY signal is not detected within a specified period after the printer is turned
on.
• If an out of specified frequency of the FREQUENCY signal is detected after the printer is turned on and the signal is
once detected.
2. Technology
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