Failure detection
The DC controller monitors the following motors to determine a motor failure:
●
Drum motor
●
Scanner motor
●
Fuser motor
The DC controller determines if the motor has failed and notifies the formatter when the motor
encounters the following conditions:
●
Startup failure—The motor does not reach a specified rotational count 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.
The DC controller notifies the formatter of a beam detect (BD) failure when it detects a rotational failure
of the scanner motor.
The DC controller monitors the related part condition of the following motors to determine a motor
failure:
●
Upper cassette lifter motor
●
Lower cassette lifter motor
8
Chapter 1 Theory of operation
ENWW
Summary of Contents for LASERJET ENTERPRISE MFP M725dn
Page 1: ...LASERJET ENTERPRISE MFP M725 Troubleshooting Manual M725z M725dn M725f M725z ...
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Page 3: ...HP LaserJet Enterprise MFP M725 Troubleshooting Manual ...
Page 6: ...iv Conventions used in this guide ENWW ...
Page 32: ...xxx ENWW ...
Page 142: ...110 Chapter 1 Theory of operation ENWW ...
Page 457: ...4 Close the fuser jam access cover 5 Close the fuser door ENWW Clear jams 425 ...
Page 475: ...1 Lift the document feeder latch 2 Open the document feeder cover ENWW Clean the product 443 ...
Page 516: ...484 Appendix A Service and support ENWW ...
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