C-2811 error on Konica C6000L

**sabina** · 06-07-2023

Hello everyone,

I am getting a C-2811 error on a C6000 machine. According to what I read and watched, I took out the transfer belt, the yellow drum behind it (as 1 means yellow) and there was supposed to be a sensor under the developer unit that should be cleaned, although I didn't see anything that looked like a sensor, there is just a shiny plate all along under the developer unit. I attached a photo.

So does this model have a TBP sensor? Or what else could I try?

With kind regards and hope that someone has an advice, as I need to print a few books

Sabina

**Synthohol** · 06-07-2023

when you slide out the carriage this assy is on the inner left wall.
gently lift the shutters and clean the windows.

2.18.5 C-2811CodeC-2811ClassificationMain body: Gamma correction abnormalityCauseThe proper value cannot be figured out within the specified time by the correction of the patch density correction /Y. Or, the proper value of the developing DC output is 0 or lower.Measures to take when alert occursThe main body stops immediately to turn OFF the power relay (RL1).Estimated abnormal parts• Printer control board (PRCB)• Developing unit /Y• IDC sensor (IDCS)• IDC shutter solenoid (SD3)Correction Note• The message "Please call service" is displayed on the panel.Solution1. Check that the process unit is correctly installed without looseness, and reinstall/repair it if any abnormality.2. Check the installation of developing unit and I/O, and repair/replace it if any abnormality.3. Check the connector connection and the wiring between PRCB and IDCS, and repair it if any abnormality.4. Check the I/O of SD3 and repair/replace it if any abnormality.5. Check the sensor, and clean/repair it if any dirt or abnormality. (Wiring diagram: Main body (3/3): 5-P)6. Replace IDCS.
7. Replacing the developing unit8. Replace PRCB.Faulty part isolation DIPSW Control while detached

you can swap DV units to see if the issue follows the DV or its the slot.
just tape over the holes so the different color toner wont add.
leave the toner door open so it wont even try to add while performing this test.

**blackcat4866** · 06-08-2023

Yes, it's not on the imaging drawer. The patch sensors are in a metal rectangular box on the left inner frame.

You can do a cursory cleaning by opening the shutters, and wiping the lenses for the sensors. If you happen to notice the metal box buried in toner, you'll need to remove and disassemble to adequately clean the patch sensors. It is also possible for toner to penetrate the lens/sensor so it cannot be cleaned, must be replaced.

Lastly, check that the solenoid action fully opens the shutters. A partially open shutter will give false patch readings. =^..^=

**wjurls** · 06-08-2023

Yellow is always the code thrown when there is an issue with the sensors mentioned above, or a transfer belt cleaning issue.

**sabina** · 06-17-2023

Hello,

I cleaned the sensors on the left inner wall, although they didn't seem dirty. I only used a clean tissue, is it OK to use isopropyl alcohol?

I also swapped yellow and magenta dev units, as Synthohol suggested, and now it throws a 2812 code. I suppose that means fault is in the yel dev unit? Can I still try anything to fix this unit or do I need a new one?

Thanks

**blackcat4866** · 06-17-2023

You confirmed that it is the developing unit. Install a new developing unit with new developer, stir, & calibrate. =^..^=

**sabina** · 06-20-2023

Update: I entered service mode (while starting the machine keeping front door open so it didn't enter adjustments), then opened 'toner density revert' under 'drum pecuiliarity' and I kept pressing start for all sensors (CMYK) until they all came close to the recommended value of 1.26v - what I remember, they were within 0.1v or so. Then I ran gamma auto adjustment, reset and I am printing again.

I picked this up somewhere on the net, and now I wonder if anyone here can shed some theoretical light on it? My machine has been working all day long, but is there any telling for how long?...

Anyway, cheers and thanks for help!