black background

[Mina Banoub]

Hi guys,
I have a canon IR3035N that sometimes print a totally black background with image formed on the paper . Need Help, Thank you in Advance

[teckat]

Re: black background

Hi guys,
I have a canon IR3035N that sometimes print a totally black background with image formed on the paper . Need Help, Thank you in Advance

Check and
Reform the leaf spring on the front side of the machine that makes contact with the steel registration roller.
The spring may bent backwards far enough that it is making contact with the transfer roller causing black copies. Please see the photo below.




Are Copies and Internal Prints Solid Black.

[Mina Banoub]

Re: black background

Thank you Mr.Teckat for your response . The leaf spring is ok and the steel registration roller is clean (good contact ) . About the internal print, I cannot tell because the machine is not used as a printer and even I make a report print the output is ok but I still cannot tell because the faulty image is not constant it just appears randomly, But If you worry about the reader I think it`s ok because when I make 100 or 200 copies of the same original black back grounded copies appear in the middle of the copies. I attached a faulty image. Thank you again

[copier tech]

Re: black background

Looks like a bad drum Earth. Have you tried another drum unit?

[hsrmms]

Re: black background

Is that black ground comes when used as copier or printer or both??

[teckat]

Re: black background

Thank you Mr.Teckat for your response . The leaf spring is ok and the steel registration roller is clean (good contact ) . About the internal print, I cannot tell because the machine is not used as a printer and even I make a report print the output is ok but I still cannot tell because the faulty image is not constant it just appears randomly, But If you worry about the reader I think it`s ok because when I make 100 or 200 copies of the same original black back grounded copies appear in the middle of the copies. I attached a faulty image. Thank you again

Internal Prints>
Did u Make test prints by making the following selections in service mode:
COPIER>FUNCTION>MISC-P>P-PRINT
Enter a test print type number and press the Start key for test printing. (After test
printing, be sure to return the number to 0.)
0: Image from CCD (Ordinary print)
1: Checker
2: 17 tones (Error diffusion method [T0BIC])
3: 17 tones (Dither screen method)
4: Totally white 00H
5: Halftone 80H (Error diffusion method [T0BIC])
6: Halftone 80H (Dither screen method)
7: Totally black FFH
8: Horizontal line (space: 27 dots, line width: 40 dots)
9: Horizontal line (space: 50 dots, line width: 60 dots)
10: Horizontal line (space: 3 dots, line width: 2 dots)
11: Halftone 60H (Error diffusion method [T0BIC])
12: Halftone 60H (Dither screen method)
13: Halftone 30H (Error diffusion method [T0BIC])
14: Halftone 30H (Dither screen method)
15 - 20: For development




Background----does it have a grainy feel or smooth ? does ir rub off ?
poor ground
bias issue ??


have u check your outlet for proper supply & grounding ( neutral to ground 0v>0.5v )

[mramlawi]

Re: black background

It looks like a dc board problem like ir5570 series

[Mina Banoub]

Re: black background

Hi Guys, Thank you all for your efforts. Here are the answers for your questions , I made all the test prints you mentioned Mr. Teckat and they are all ok and the black ground has a smooth feel and it doesn`t rub off. And of course I replaced a Drum Unit .

[teckat]

Re: black background

Hi Guys, Thank you all for your efforts. Here are the answers for your questions , I made all the test prints you mentioned Mr. Teckat and they are all ok and the black ground has a smooth feel and it doesn`t rub off. And of course I replaced a Drum Unit .

-----------------------

So ---all internal test prints are OK

Issue is from glass copies or when using DF ??
What about your PC network prints ??

[hsrmms]

Re: black background

Hi Guys, Thank you all for your efforts. Here are the answers for your questions , I made all the test prints you mentioned Mr. Teckat and they are all ok and the black ground has a smooth feel and it doesn`t rub off. And of course I replaced a Drum Unit .

your problem comes when you make copier using glass so you need to check flexible cable the attached with the scanner this cable when had abad contact while effect the amount of light in scanning lamp that make you the black background.

[Mina Banoub]

Re: black background

The machine is not working as a printer (copier only ) .
Issue is from glass copies.
And I think it has nothing with the reader unit as it appears in the middle of a multi copies job with single scan .

[blackcat4866]

Re: black background

I'm thinking you have either a drum ground issue or primary charge issue. The sample you have has been written by the laser.

1) To check the drum ground: Measure the resistance from the metal edge of the drum surface to the frame ground. You should consistently get very close to 0 ohms. If not, you need to find where that connection is lost.
2) If you replaced the drum unit, it came with a new primary charge. That leaves either charge contacts or the HVT. In my Canon days I replaced only one HVT ever, on any Canon, so I would focus on charge contacts.

On a side note, I would apply some conductive grease to the registration roller ground.
Good luck. =^..^=

[Mina Banoub]

Re: black background

Thank you all guys , Problem solved . There was a broken part in the HV pcb .