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Malfunction C 3851

How do I fix the problem stated in the subject

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C3851 Abnormal Low Temp. (Heater):

• The temperature of the Heating Roller Thermistor/ 1 (TH1) is lower than a given level of degree for 1 second or more uninterruptedly during
Ready mode, Low Power mode or printing.
• The temperature of the Heating Roller Thermistor/ 2 (TH3) is lower than a given level of degree for 1 second or more uninterruptedly during
Ready mode, Low Power mode or printing.
Try resetting. To reset a Rank A error follow these steps:
1. Turn OFF the Main Power Switch.
2. Turn Main Power Switch ON while pressing the Utility/Counter key.
3. Touch [Trouble Reset].
4. Check to make sure that [OK] is displayed and the it has been reset.
5. After turning off the Main Power Switch, turn it on again more than 10 seconds after and check if the machine starts correctly.
If the error recurrs then do the following:
1 Check the Fusing Unit for correct installation (whether it is secured in position).
2 Check the Fusing Unit, PWB-M and PU1 for proper connection and correct or change as necessary.
3 Change Fusing Unit
4 Change PWB-M
5 Change PU1

Posted on Jan 04, 2008

  • s_slaybaugh Dec 02, 2013

    When I follow the reset directions, The Trouble reset button never appears. It stays on the fault page. What do I do next?


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C3851: Abnormal Low Temp. (Heater)

reboot, troble reset should fix it

Posted on Dec 31, 2007


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