Canon IR2870 Light Print Issue

[Guest]

Thanks for looking!

I have a problem with light (and slightly mottled) prints on a ImageRunner 2870 with 140K clicks on it.

I have rebuilt the drum assembly, with new drum, cleaning blade, PCR. Prints are better than what they were and resolved some streaking issues. However, the prints are about 40% lighter than they should be, with some evidence of mottling.

I suspect developer issues, and I am inclined to replace the developing assembly. The mag roller does seem to have overly light density of toner on it while I spin it.

Question 1: Does this developing assembly use some type of developer powder, some Xerox machines (Xerox Phaser 7750/7760) and can it be purchased and the assembly recharged? This part is about $250 and developer powder is typically much cheaper.

Question 2: Am I on the right track thinking it is the developing assembly at fault?

Thansk for the input!

[Tricky]

The toner is mono component.

Compatible toner can cause light copies on this machine. If this is the case you will see a big improvement by dumping the dev and using genuine Canon toner. I have only had to change dev cylinders due to scratches, its unlikely changing the assembly will improve matters.

[teckat]

Thanks for looking!

I have a problem with light (and slightly mottled) prints on a ImageRunner 2870 with 140K clicks on it.

I have rebuilt the drum assembly, with new drum, cleaning blade, PCR. Prints are better than what they were and resolved some streaking issues. However, the prints are about 40% lighter than they should be, with some evidence of mottling.

I suspect developer issues, and I am inclined to replace the developing assembly. The mag roller does seem to have overly light density of toner on it while I spin it.

Question 1: Does this developing assembly use some type of developer powder, some Xerox machines (Xerox Phaser 7750/7760) and can it be purchased and the assembly recharged? This part is about $250 and developer powder is typically much cheaper.

Question 2: Am I on the right track thinking it is the developing assembly at fault?

Thansk for the input!

Why would you put XEROX starter in this machine ??
Are u a tech. ??

Check setting under-COPIER>ADJUST>DEVELOP and confirm a setting of +115 to +120
Check>developing assembly Cam pressure

[Canuck]

Did you run DPC in service mode? Crash the machine and check what the image looks like on drum before transfer. If good...transfer problem. If bad image on drum,probably dev.

[dwhoover]

The toner is mono component.

Compatible toner can cause light copies on this machine. If this is the case you will see a big improvement by dumping the dev and using genuine Canon toner. I have only had to change dev cylinders due to scratches, its unlikely changing the assembly will improve matters.

Thanks for the info skynet....I had a feeling the toner was mono component when I did not see "developer" for this machine anywhere on the 'net or parts lists....

I will check the toner, but I believe it was genuine Canon...perhaps old toner tho.....

[dwhoover]

teckat,

Thanks for your suggestions...I will try them in the morning!

I was not suggesting Xerox developer for this Canon, just pointing out as an example that some copy/print systems are dual component systems.

What do I look for in terms of developing assembly cam pressure?

[dwhoover]

Canuck,

Jeez you guys are good...I should have narrowed down the issue by doing a stop test as you suggest....

Thanx for the input....

[dwhoover]

Thanks for the help so far guys, I will follow up tomorrow on the suggestions.

I am going to remove the toner cartridge, replace it with a known, new, genuine toner; remove the dev assembly and vac out the remaining toner, clean dev cylinder (mag roller) and reassemble. Then I will try the suggestions everyone and graciously given.

Thanks again guys!

[teckat]

[ATTACH=CONFIG]7867[/ATTACH]

check for proper cam engagement to developer unit

[dwhoover]

Why would you put XEROX starter in this machine ??
Are u a tech. ??

Check setting under-COPIER>ADJUST>DEVELOP and confirm a setting of +115 to +120
Check>developing assembly Cam pressure

teckat,

Your instruction:

"Check setting under-COPIER>ADJUST>DEVELOP and confirm a setting of +115 to +120"

resulted in blank page.

Any suggestions??

[teckat]

teckat,

Your instruction:

"Check setting under-COPIER>ADJUST>DEVELOP and confirm a setting of +115 to +120"

resulted in blank page.

Any suggestions??

check setting !!!!!! > means to View what the Developer setting is showing on the screen

if u have a blank page/ that is another issue/
did u check to see the Cam Pressure
check Developer Clutch
Check to make sure the developing cylinder is turning.
Re-seat transfer roller and confirm correct pressure.

check if the Laser Shutter is operating correctly. To check the Laser Shutter, first remove the Left Middle Panel.Open and close the right door while looking at the bottom of the laser where the shutter is located. You should see the shutter move from front to rear. If the shutter is not moving, check to see if it is out of place or that the shutter cable is working correctly.
shutter.jpg

[chnaveen]

canon ir2870 light copy change the deloping cylinder and clean the laser lens

canon ir2870 light copy change the deloping cylinder and clean the laser lens

[teckat]

canon ir2870 light copy change the deloping cylinder and clean the laser lens

no band-aid fixes

[Canuck]

You say you “rebuilt" the drum unit? Some if not all the drum kits are pain in the arse/unreliable. Before you start problem solving try A GENUINE CANON DRUM UNIT as the m/c has only done 140k the dev unit should be fine (unless you have also put in non-GENUINE CANON TONER.
Geninue Canon toner, Drum unit, Fixing film = reliable m/c

I couldn't agree more.

[HELIO240]

cleaning laser unit ,the laser whith dust make the copier light and however toner always use the original because the same have a 2 components .