Konica C280 error P-21

[jonbonse]

Hi all

As a Ricoh engineer, I'm steadily learning the Konica machines and have a C280 which presents error P-21.

I understand this is an ID read error of the calibration patches on the transfer belt.

This machine had a yellow colour alignment issue which I managed to resolve (more or less) by adjusting the yellow registration in expert adjustment.

Im not totally satisfied that colour reg is the best it can be as I've never had to manually adjust on these.

I have swapped the transfer belt with a used belt and run image stabilisation and gradation.

I have cleaned both ID sensors and swapped the drums round and also reset the drums with reset chips.

Solid colour prints from service mode ensure me that the drums and devs are fine, nice and solid....

I have cleaned the laser windows with the white sticks under the drums.....

Im at a loose end now and have ordered a brand new transfer belt but wanted to see if anyone could help or share their experiences with this error?

Many thanks

[copier tech]

Re: Konica C280 error P-21

This is usually caused by a worn ITB unit or dirty ID sensors, also drums past life can cause this.
After you have replaced the new ITB unit run initialise+gradation.

You can have a P-21 error & it not cause any real problems, however it does require you or the user to run a regular gradation adjustment.

[allan]

Re: Konica C280 error P-21

Coming from RICOH color machines these C280 machines are a joy to work on.

Check in service mode under State Confirmation system 1 what the IDC values are.
There is two sensors to check the patches 2 colors on each side.
If those values are not the same IDC1 and IDC2 the belt could be bad on one side.

Under system 2 you can see the bare surface reflective values of the belt.
If you don't get a the right value under system 2 the sensor shutter could be faulty.

[jonbonse]

Re: Konica C280 error P-21

Coming from RICOH color machines these C280 machines are a joy to work on.

Check in service mode under State Confirmation system 1 what the IDC values are.
There is two sensors to check the patches 2 colors on each side.
If those values are not the same IDC1 and IDC2 the belt could be bad on one side.

Under system 2 you can see the bare surface reflective values of the belt.
If you don't get a the right value under system 2 the sensor shutter could be faulty.

Thanks!

Under State Confirmation, Level History 1, IDC1 value is 1.62v and IDC2 is 2.91v. I hear the shutter open as I press enter.

In Level History 2, IDC Sensor Adjust 1 and 2 are both 255. . . . (pics attached)LH1.jpgLH2.jpg

[allan]

Re: Konica C280 error P-21

Is the transfer belt a matt color on the sides .

[jonbonse]

Re: Konica C280 error P-21

Is the transfer belt a matt color on the sides .

Not too sure what Matt colour is but have included pics. . . .ITB-2.jpgITB-1.jpgITB-3.jpg

[mo0651]

Re: Konica C280 error P-21

We had a brand new transferbelt cause this error, if you have one to swap I would try it.

[JR2ALTA]

Re: Konica C280 error P-21

are we talking about an oil can error?? IGNORE IT!

[jonbonse]

Re: Konica C280 error P-21

are we talking about an oil can error?? IGNORE IT!

Unfortunately can't as the colour misalignment has returned!

[allan]

Re: Konica C280 error P-21

Not too sure what Matt colour is but have included pics. . . .[ATTACH=CONFIG]32185[/ATTACH][ATTACH=CONFIG]32186[/ATTACH][ATTACH=CONFIG]32187[/ATTACH]

Does that yellowish color on the left could cause your problem. Does that wipe of with a cloth?
I think a new ITB will fix your problem.
How many prints on it??

[jonbonse]

Re: Konica C280 error P-21

Does that yellowish color on the left could cause your problem. Does that wipe of with a cloth?
I think a new ITB will fix your problem.
How many prints on it??

No it won't clean off.... It's done 367k.......

i I have a new ITB on order for delivery Monday so I hope it does the trick!

[allan]

Re: Konica C280 error P-21

Have you changed development units yet. When last did you change drums? There is something shady about that yellow.

[jonbonse]

Re: Konica C280 error P-21

Have you changed development units yet. When last did you change drums? There is something shady about that yellow.

I haven't replaced the devs but had them all out and don't look too bad....(pic of yellow attached)

I have tried swapping the drums and have reset the chips.....

[3boydad]

Re: Konica C280 error P-21

are you getting this by touching the oil can icon? which it sounds like. it's just to run drums past counters. ignore it.

[jonbonse]

Re: Konica C280 error P-21

are you getting this by touching the oil can icon? which it sounds like. it's just to run drums past counters. ignore it.

yes but the colour reg is out now.....