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1 October, 1999
SC546: Unstable fusing temperature
Definition: [A]
Fusing temperature more than 60 °C: The fusing temperature does not rise 2°C
or more within 6 seconds after the fusing lamp has been on.
Fusing temperature 60 °C or less: The fusing temperature does not rise 2°C or
more during a 6 second interval (the 6 s timer starts 14 s after the fusing lamp
turned on).
Possible Causes:
• Thermistor defective
• Poor connection of the fusing unit
• Power supply unit defective
SC547: Zero cross signal malfunction
Definition: [A]
Zero cross signals are not detected within a certain period.
Possible causes:
• Power supply board defective
• Engine board defective
SC590: Fusing fan motor error
Definition: [B]
The CPU detects an exhaust fan lock signal for more than 3.5 seconds.
Possible causes:
• Poor connection of the exhaust fan motor
• Too much load on the motor drive
SC610: Communication error between the engine board and duplex unit
Definition: [B]
The engine board cannot communicate with the duplex unit properly.
Possible causes:
• Poor connection for the interface cable for the duplex unit
• Duplex control board defective
• Engine board defective
SERVICE CALL CONDITIONS
7-7
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