No Magenta + Error P-7 , P21 and P-28

[Jamil Mungur]

Hello
I have a Bizhub C224e with print quality problem.On my first intervention there was error code P-7, P-21 and P-28 and also an uneven magenta background on all prints.
Replaced the Magenta Developing unit and also the drum unit. Now the problem is that the machine is not printing magenta. The other colors are ok.

Printed the color pattern, the black is ok but all the other colors are not good. I attached the prints.The toner concentration seems ok for all 4 colors and also the IDC sensors.
Removed and fixed back the High Voltage pcb but the problem is still the same.
When i put back the old drum and old developing unit the problem is still the same.

Did a manual toner add in service mode but problem is still the same.

[Copier Addict]

Re: No Magenta + Error P-7 , P21 and P-28

Try a new transfer belt. I see you have a mark on both the black and magenta gradation patterns.
And clean the IDC sensors.

[MARDSO]

Re: No Magenta + Error P-7 , P21 and P-28

I already got problem in laser flat cable! wipe his contacts

[allan]

Re: No Magenta + Error P-7 , P21 and P-28

The diagonal lines on that sample print for magenta shows low developer. But does not seem to be your problem.

[Jamil Mungur]

Re: No Magenta + Error P-7 , P21 and P-28

Hello

I will try to clean the contacts of the four lasers and also i am planning to test with a new transfer belt.

Allan i do not understand , please explain to me.
The diagonal lines on that sample print for magenta shows low developer. But does not seem to be your problem.

I will keep you all updated.
Thanks

[Jamil Mungur]

Re: No Magenta + Error P-7 , P21 and P-28

I replaced the Transfer Belt and also cleaned the contacts the laser units. Problem is still the same. The diagonal lines on the prints are also still here.

[allan]

Re: No Magenta + Error P-7 , P21 and P-28

If you remove the developer tank you will see that pattern on the mag roller.

[tech51]

Re: No Magenta + Error P-7 , P21 and P-28

I suspect your Hv board has failed causing dev to be depleted from the unit.
You say you have removed & fixed back the Hv but not replaced it.
You will have to replace the dev unit again.

[Jamil Mungur]

Re: No Magenta + Error P-7 , P21 and P-28

Is there a way to test the HV board ? I do not have a HV board in hand so i will have to order it. I want to be sure before ordering so i want to test the HV board.

[allan]

Re: No Magenta + Error P-7 , P21 and P-28

No not if you don't have a proper test bench, some of the voltages are too high for a standard tester.
How to get to test points on the grid, scorotron and dev bias?

[Jamil Mungur]

Re: No Magenta + Error P-7 , P21 and P-28

I checked and cleaned the contacts of the laser unit today problem still the same. I plan to take the mahcine's HV board and test it on another working machine.
Will keep you all updated.

I am sorry allan, please explain

How to get to test points on the grid, scorotron and dev bias?

[allan]

Re: No Magenta + Error P-7 , P21 and P-28

There is no real way to get tester probes to where the problem could be.

[Jamil Mungur]

Re: No Magenta + Error P-7 , P21 and P-28

thanks for reply allan.

Can someone tell me if the HV board of the bizhub C224 and the bizhub C224e are the same ? The reference is the part catalogue are different.

[bineeshgeorge]

Re: No Magenta + Error P-7 , P21 and P-28

Same

[Jamil Mungur]

Re: No Magenta + Error P-7 , P21 and P-28

Hello

I took a HV board from a bizhub C224 today and tested it on the faulty C224e. Result still same problem. Still the P-7, P-21 and P-28 warnings and the print quality problem.

Any idea what could be the problem ?