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sc 491 is error signal is detected for 0.2 seconds when charging the drum or development.
• High voltage leak
• Broken harness
• Defective drum unit or development unit
• Defective high voltage supply unit
An SC990 is usually an error indicating maintenance is overdue. The only way to verify that is by printing out the SMC report and seeing the subcodes. In the case of this model when is the last time the drum and developer was replaced?
sc 307 is a charge bias error having to do with the yellow photoconductor unit (PCU). Replacing the yellow PCU should resolve your problem. If the problem persists even with a new PCU, you will likely need to have either the high voltage supply board or the drum positioning plate replaced.
You should have a service technician take a look at your copier. SC302 is a charge roller current error, and it could be caused by a number of things, from a dirty charge roller to a faulty high voltage supply board.
In the meantime, try turning the machine off, unplugging it, and then plugging it back in and turning it on the see if the error message will clear.
replace the black pcu(drum unit). the life of the pcu(s) are 15k each(blk & col) . the machine will work but copy quality will reduce and the error will be there. replacing the cartridge has nothing to do with this error.
The SC 441 is a color pcu motor lock. One of the waste toner augers is clogged with waste toner not letting the drum turn. The only real fix is to replace the color pcu unit. If you could get the auger and drum out it might be possible to free it up, but you will probably damage the drum in the process.
SC307 - Charge AC bias error [Y] (Level D Error)**
Symptom: The charge current less than 200 ìA is detected.
Possible Causes / Required Actions: • Defective charge roller • Defective connectors • Disconnected harness • Defective high voltage power 1 1. Check the connectors. 2. Replace the PCU for yellow. 3. Replace the drum positioning plate. 4. Replace the high voltage power 1.
** (Level D Reset Procedure) Turning the main switch off then on resets SCs displayed on the operation panel. These are redisplayed if the error occurs again.
This Code relates to color gamma error in the Yellow development. Possible causes Low toner density in the Y toner,Toner supply Y mechanism problem( not supplying enough toner),Laser exposure problem, image transfer problem. My suggestion would be to ensure you have toner in the cartridge( but by this time it has depleted the developer), and you will need to replace the development unit and possibly the drum Unit. My best guess would be the development Unit.