[Misc] Some patterns appearing on the copies

[Guest]

I replaced the drum and the blade (new) but still the problem presists. When blank copy is taken a type of pattern appears on the blank sheets and when fully open (platen cover) copy is taken some dots appear, I have attached copies of it.
I want to know what could be the cause for it ??? and how to solve that problem.
Can any body help me in this regard.

thanks
Umer

[zoraldinho]

Re: Some patterns appearing on the copies

Copier model?!

[totoro]

Re: Some patterns appearing on the copies

Do these patterns appear on prints? Have you checked the developer mag roller?

[blackcat4866]

Re: Some patterns appearing on the copies

Model number please?

Just in general terms it looks like a charge related issue. Anything more specific will depend on the model. =^..^=

[teckat]

Re: Some patterns appearing on the copies

I replaced the drum and the blade (new) but still the problem presists. When blank copy is taken a type of pattern appears on the blank sheets and when fully open (platen cover) copy is taken some dots appear, I have attached copies of it.
I want to know what could be the cause for it ??? and how to solve that problem.
Can any body help me in this regard.

thanks
Umer

replace the Developer Unit

[Herrmann]

Re: Some patterns appearing on the copies

replace the Developer Unit

I have seen this on a ir5000, where the coil of the drum cleaning unit was broken so the waste toner could not hauled away. This lead to stuck waste toner in the cleaning unit and generates exactly this printout.
check this first.

If this is an older, maybe analog model, i am with teckat, replace the spacer rollers which generates the distance between developing cylinder and drum

[umer]

Re: Some patterns appearing on the copies

Dear Friends
Thank you for your replies

My Machine model is IR2018 Canon.

Developer unit I cleaned well and checked for any leaks, and the rollers I checked, It seems every thing is fine.
I am attaching a scanned copy of the sheet which is copied on this copier. You can see the patterns on the
sheet.

I have a doubt, Is it related to any memory (RAM) problem ????

Please friends do reply

[zoraldinho]

Re: Some patterns appearing on the copies

How many copies have machine? Swap developer.

[blackcat4866]

Re: Some patterns appearing on the copies

How many copies have machine? Swap developer.

... along the same lines: I've seen the same effect when the main charge is cranked all the way up, and the carrier is being pulled from the developing unit. Start with new developer, then look at charge settings. =^..^=

[Herrmann]

Re: Some patterns appearing on the copies

no Developer at all, Canon B/W Mashines use one component Toner. Replace the whole Drum unit, looks for me like a Charge Roller problem.

[mramlawi]

Re: Some patterns appearing on the copies

hello
try to change the drum unit .also try to stop the paper befor it enter the fixing unit .

waiting ur reply

[teckat]

Re: Some patterns appearing on the copies

Dear Friends
Thank you for your replies

My Machine model is IR2018 Canon.

Developer unit I cleaned well and checked for any leaks, and the rollers I checked, It seems every thing is fine.
I am attaching a scanned copy of the sheet which is copied on this copier. You can see the patterns on the
sheet.

I have a doubt, Is it related to any memory (RAM) problem ????

Please friends do reply

DID U REPLACE THE DEVELOPING UNIT

did u check the HVT ?????????????????
DC bias and an AC bias may be out of wack

DC.JPG
ASIC on the DC controller PCB outputs the developing AC bias drive signal (/DVACFOT), developing AC bias ON/OFF signal (/DVACON), developing DC bias drive signal (/DVDCFOT), and developing DC bias output level signal (/DVDCPWM) to apply the voltage generated by superimposing the developing AC bias over the developing DC bias to the developing cylinder



After installing or replacing the developing assembly, be sure to perform "Developer Idling mode" before inserting the toner cartridge.

1. Plug the power code and open the front cover. Then, turn the main power switch ON.
2. When a message is displayed on the LCD, make the following selections in sequence on the control panel to enter service mode: [Additional Functions key > the numeric key "2" > the numeric key "8" > Additional Functions key].
3. Display "#PRINT" on the LCD by pressing the "plus (+)" key or the "minus (-)" key > OK.
4. Display "#PRINT SW" on the LCD by pressing the "plus (+)" key or the "minus (-)" key > OK > make sure that the indication "#PRINT SW 001 00000000" is displayed on the LCD.
5. The "#" key > the numeric key "1" > the numeric key "1" > make sure that the indication "#PRINT SW 011 00000000" is displayed on the LCD.
6. Place the cursor under Bit1 (the second digit from the right) by using the "plus (+)" key or the "minus (-)" key > the numeric key "1" > make sure that the indication "#PRINT SW 011 00000010" is displayed on the LCD.
7. OK > make sure that the indication on the LCD is changed to "SW 012 00000000."
8. Press the Reset key to go out of service mode.
9. Once the front cover is closed, 1-minute idle rotation of the developing assembly is started automatically. Then, insert the toner cartridge

[bojans]

Re: Some patterns appearing on the copies

It could be charge corona.
I've seen this on ir 3300 when we were changing only drums and blades. After 3 drums changed (300K), charge corona was causing this mess.

[zoraldinho]

Re: Some patterns appearing on the copies

It could be charge corona.
I've seen this on ir 3300 when we were changing only drums and blades. After 3 drums changed (300K), charge corona was causing this mess.

This model don't have corona.

[blackcat4866]

Re: Some patterns appearing on the copies

Hmmm... no developer. This looks so much like high charge pulling developer. This used to happen all the time on the Mita DC313Z. the tech would try to stretch the developer life (it was only 30K). Often we could get 50K, but eventually if you keep cranking up the charge you'll get developer copies just like this. The first clue was the VR topped out or the stop broken off by turning past the limit.

It's got to be developing related. How many copies/prints on this machine? =^..^=