The DC controller detects a failure by monitoring a motor:
The DC controller determines if a motor has failed and notifies the formatter when it encounters the
following conditions:
●
Startup failure: the motor does not reach a specified speed within a specified time from when the motor
starts.
●
Rotational failure: the rotational speed of the motor is not in the specified range for a specified time
after the motor reaches a specified speed.
●
Lock detection (for the residual toner feed motor): the value of the motor drive signal voltage is not in
the specified range for a specified time.
The DC controller detects a failure by monitoring a part related to the motor:
The DC controller determines if a motor has failed and notifies the formatter when it encounters the
following conditions:
●
Developing disengagement motor: A specified signal is not detected from the developing
disengagement sensor during a developing assembly operation.
●
Lifter motor: The cassette media stack surface sensor does not detect the media surface within a
specified time period after the lifter motor starts.
●
Scanner motor: The scanner motor does not reach a specified speed within a specified period after the
scanner assembly starts.
●
A specified beam-detect (BD) interval is not detected during a print operation.
Fans
The product has eight fans for preventing the temperature from rising in the product.
The DC controller determines if there is a fan failure and notifies the formatter if the fan locks for a specified
time from when the fan starts.
Table 1-8 Fans
Abbreviation Name Cooling area Type Speed
FM1 Power supply fan
Low-voltage power supply fan
Around the power supply unit Intake Full/half
FM2 Cartridge fan Around the cartridges Intake Full/half
FM3 Delivery fan (M651 only) Around the delivery assembly Exhaust Full/half
Exhaust fan 2 (M680 only) Around the delivery assembly Exhaust Full/half
FM4 Exhaust fan 1 Around the cartridge Exhaust Full/half
ENWW Engine-control system 13
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