3551ci background problem

[BillyCarpenter]

This machine is having intermittent backgrounding problems when printing. Sometimes the page will have a blue background. Other times it will be red. It never does it while I'm there but they've saved examples for me.

I would prefer not to start swapping stuff until the problem is corrected.

Any ideas?

PS - I didn't bring the examples back to the shop or I would post them.

[copiertec]

Re: 3551ci background problem

Whats the count on color? Did you clean the charge rollers? Did you perform color calibration, drum refresh, etc.?

[BillyCarpenter]

Re: 3551ci background problem

Whats the count on color? Did you clean the charge rollers? Did you perform color calibration, drum refresh, etc.?

The count on the drum/dv is about 100k. I did calibration, drum and dv refresh. Didn't clean the charge roller. Are you talking about the transfer roller or the PCR?

[copiertec]

Re: 3551ci background problem

The count on the drum/dv is about 100k. I did calibration, drum and dv refresh. Didn't clean the charge roller. Are you talking about the transfer roller or the PCR?

No the charge rollers on each drum unit, they build up with ozone and cause issues if covered in the "white ozone" stuff.

[BillyCarpenter]

Re: 3551ci background problem

No the charge rollers on each drum unit, they build up with ozone and cause issues if covered in the "white ozone" stuff.

It's possible but that means that 2 PCR's (cyan, magenta) went bad at the same time. Unless someone comes up with a better idea, I think I'll replace the cyan and magenta drum & DV with a known good one...that would include the PCR for both. I don't think that's the problem though. But I'm at loss.

[copiertec]

Re: 3551ci background problem

It's possible but that means that 2 PCR's (cyan, magenta) went bad at the same time. Unless someone comes up with a better idea, I think I'll replace the cyan and magenta drum & DV with a known good one...that would include the PCR for both. I don't think that's the problem though. But I'm at loss.

Most instances with shading of colors on that series I have run into have been dirty PCR's. I clean the PCR, calibrate mfp and that usually works as long as the client is using OEM toners.

[BillyCarpenter]

Re: 3551ci background problem

Most instances with shading of colors on that series I have run into have been dirty PCR's. I clean the PCR, calibrate mfp and that usually works as long as the client is using OEM toners.

Thanks. I'll give it a shot. Thanks again.

[blackcat4866]

Re: 3551ci background problem

I agree. Overtoning seems to be the main cause of backgrounding on AlphardII's. =^..^=

[BillyCarpenter]

Re: 3551ci background problem

I agree. Overtoning seems to be the main cause of backgrounding on AlphardII's. =^..^=

It's strange because it happens rarely. A few sheets a day. Never happens when I'm there.

[blackcat4866]

Re: 3551ci background problem

I believe that there are pockets of toner that are poorly mixed into the developer. When one of those pockets surfaces you get a puff of unattached toner. =^..^=

[KYO_OEM]

[BillyCarpenter]

Re: 3551ci background problem

KYO,

Was just reading over the documentation you sent. That's impressive stuff. I'm going to the account today and I'll print the service logs. I'll let you know.

Thank you so much.

[BillyCarpenter]

Re: 3551ci background problem

If surface from belt would damaged by paper dust or else, system runs in wrong calibration and you can get colored background.
Both values from “STRESS“ must be ≥ 2600
Values 2200 or less →Surface from the transfer belt faulty, as a result you can get wrong calibration results
U468/ V Correction = 65535 ??
Shows History from last 16 calibrations.
“65535“ (binary coded decimal value) “Good Value“
Same as : 1111 1111 1111 1111/ All calibrations successfully
For analyzing use Windows calculator /programmer mode, select “decimal mode“ and type in V Correction value
e.g.“65534“= 1111 1111 1111 1110/ last calib. failed

(You got additional mail from me)

Here's the values you told me to check:

U468/V-correction - 16383 ------> 0011 1111 1111 1111

Looks like calibration failed 2 times

U465 - 2394, 2310

Looks like the transfer belt is good.


I forgot to check:

C7601-front ID sensor error
C7602-rear ID sensor error


Tomorrow I will check C7601 & 2 and clean both ID sensors.

Right now the prints look beautiful. Couldn't be any better. It never does this while I'm there.


PS - Thanks for teaching me something new.

[BillyCarpenter]

Re: 3551ci background problem

I'm trying to locate: (3551ci)


38. ID sensor 1 (IDS1) ................................ Measures image density for color calibration.
39. ID sensor 2 (IDS2) ................................ Measures image density for color calibration

I see the location in the manual but can't find them on the machine. It's hard to tell what they look like in the diagram so I really don't know what I'm looking for.

[KYO_OEM]

Re: 3551ci background problem

FIG. 23 Electrical Components 1
Item #7, below the belt.
If you remove the belt, you will see both sensors.
Covered by shutter

But i don`t think it`s the reason in your case.
If we get problems with this sensors, last calibrations would show "0" instead of "1".
MAybe you don`t know how to read binary coding.
You has to read from the right side.
16th -12th calibrations--> last 4 calibrations
0111 1111 1111 1111

Maybe you can share U000/ saved as *.txt file