This error message is related to the drum heater malfunctioning. It is basically 4 small halogen bulbs that warm up the image drum. Sometimes one or two of the bulbs will blow causing this error. The part # is 650-4228-00 Drum/Paper Heater assy. It is not extremely difficult to change, however you need torx bit screwdrivers to remove the components, also there is a very delicate paper sensor that needs to be removed, so you may want to have a technician replace it.
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I think I had this error once. Could be your bulbs (one or both) are out or are on their way out. I had to replace mine. They are 150 watt halogen bulbs. When you open it up, do you see lights on the side peering in?
Verify process motor operation with the Process Motor diagnostic
test. Also exercise processes run with the process motor;
transfix, drum maintenance and head tilt. This can be caused by
the power control board. The process motor may have more than
one task initiated. Reset all solenoids and the pressure roller
prior to cycling power.
Hope that this helps.
Most likely cause is a failed drum heater. The head to drum gap
should only be checked or adjusted on the Phaser 840. The
Phaser 850 and 860 have a pre-adjusted head.
15,004.45: TCD_THERMISTOR_ SLOW Most likely cause is a failed drum heater. The head to drum gap should only be checked or adjusted on the Phaser 840. The Phaser 850, 860, and 8200 have a pre-adjusted head.
In other words, you need to replace the drum heater.
Here's a direct quote from the service manual on your error. Basically the is a thermistor (hi-low thermometer) that is defective or sensing that the drum is not heating to the correct temperature in the allotted time. You either have a bad drum heater, thermistor, or the drum to heater gap is way out of specification.
Service Manual Says:
Most likely cause is a failed drum heater. The head to drum gap should be checked or adjusted