The toner is not adding correctly into the developing assembly.
1) If toner hopper is overfilled, the toner motor worm gear splits as a result of the hopper becoming packed tight.
2) Sometimes the worm gear splits under normal use.
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e0020 the toner does not move down. the problem possibility : - motor of toner not moving and can not pull down the toner - sensor of toner no detect (check the socket of it perhaps it's just loosen) - or empty toner.
I am not 100 percent sure what is happening to your machine after it comes to ready, but I will offer some thoghts.
If it comes to ready and then goes back to a low heat situation. It very well could be the board if it doesnt maintain heat.
Now that being said, once a coiper comes to ready and reaches full heat, it will switch over to pulsating the heat roller, not staying on fully all the time. That is how fusers are designed. Full on until they reach operating temperature, then pulsating to maintain the rollers heat level.
If you are having a problem with the image not fusing to the paper, you may have an issue with the pressure roller not making good contact with the heat roller.
There may be a software setting that needs adjusted to increase the fuser operating temperature.
The flickering heat rod, once the machine reaches ready, seems appropriate.
If you want more of an idea, can you be more specific as to whether the machine is faulting out with an under heating situation, or is the image not fusing to the paper properly?