Bizhub C7000 belt waste toner collection unit problem

[Aeg Print]

hello all and happy holidays!
i am having a strange issue with a c7000.
The belt became dirty with waste toner so i thought it was time to replace the Belt cleaning unit
when i replaced it i noticed that the old unit was full of solid toner pieces and the tube with the worm gear leading the toner out of the unit blocked with solid toner.
I checked and the pipe system that carries the waste toner, it looked fine (it wasn't blocked in any of the inlets) but i decided to take it apart and clean it.
Done that, reinstalled the waste toner tubes system, installed a new cleaning unit, replaced the waste tone collection box and checked that everything is working fine, i made 300 a3 prints, full color and checked that waste toner was dropping inside the box.
Everything look fine for around 1000 prints but the belt became dirty again, so i took out the new belt cleaning unit and it was again full of solid toner pieces and completely blocked.
So i dont know what to do next!!
please i need your advice on this.
(i am using original toner, only original parts)

[blackcat4866]

Re: Bizhub C7000 belt waste toner collection unit problem

It sounds like the machines internal temperature is too high. Are the fans running and filters unobstructed? =^..^=

[Aeg Print]

Re: Bizhub C7000 belt waste toner collection unit problem

It sounds like the machines internal temperature is too high. Are the fans running and filters unobstructed? =^..^=

Both filters on the side are clean (the ozone filter in relatively new 100.000 prints)
the fans are working i think. but if they wouldn't isn't there a sensor to check that?
is there a way to see the internal temp of the machine ?

[subaro]

Re: Bizhub C7000 belt waste toner collection unit problem

There are three sections for the toner removal. the upper toner collecting unit, the vertical unit and the lower toner exit unit. The toner is backing up i suspect due to the the gear not turning the augur unit , therefore no extraction of the toner in the upper unit, if you said there is no blockage in the other unit. If the gear is not turning in the upper unit, it would not extract toner from the unit. When new it will collect the toner but not extract it as the augur is not turning. After a while, it will compact in there and cause it to become hard.

Note , I do not work on this machine, but looked at the parts list and saw the toner extraction components and came to this conclusion.
Let us know the fix when you solve this.

The gear I am referring to is the one that drives number 12 in the toner collection parts list.
The service manual says the belt motor drives the belt collection unit gear, which is really the augur.

The vertical pipe still extracts toner to the lower collection unit from the drums, hence the reason the pipes there are not blocked and you are seeing toner on the waste toner box. So, check the gear or motor that turns that belt waste toner extraction unit. Put a mark on the gear that turns this unit and see if it is turning. This is my theory anyway.

Ok, I looked at the service manual and saw that the transfer belt cleaning unit is attached to the transfer belt and is one unit. So replace that unit or disassemble the cleaning unit and check the gears that turn the cleaning unit from the transfer belt. Your problem I think is from this unit. Just trying to use my troubleshooting mind to solve this problem from a tech point of view. So if i am out of wack, forgive my theories.

[blackcat4866]

Re: Bizhub C7000 belt waste toner collection unit problem

This is one way to measure the internal temperature:
Digital 2 Channels K-Type Thermometer w/ 4 Thermocouples (Wired & Stainless Steel), -50~1300degC (-58~2372degF) Handheld Desktop High Temperature Kelvin Scale Dual Measurement Meter Sensor: Amazon.com: Industrial & Scientific

You can view the outputs of TEM/HUMS1 & TEM/HUMS2 here:
02 Process Adjustment > 03 Sensor Output Confirm > 03 Humidity/Temperature Output

=^..^=

[Aeg Print]

Re: Bizhub C7000 belt waste toner collection unit problem

This is one way to measure the internal temperature:
Digital 2 Channels K-Type Thermometer w/ 4 Thermocouples (Wired & Stainless Steel), -50~1300degC (-58~2372degF) Handheld Desktop High Temperature Kelvin Scale Dual Measurement Meter Sensor: Amazon.com: Industrial & Scientific

You can view the outputs of TEM/HUMS1 & TEM/HUMS2 here:
02 Process Adjustment > 03 Sensor Output Confirm > 03 Humidity/Temperature Output

=^..^=

i think that there is no temp issue here i am attaching a photo of the results. everything looks normal.
IMG_20221228_112640.jpg

[blackcat4866]

Re: Bizhub C7000 belt waste toner collection unit problem

If the sensors are reading correctly, then yes. I would double-check it against some other measurement. =^..^=

[Aeg Print]

Re: Bizhub C7000 belt waste toner collection unit problem

i also measured with a thermometer inside the machine after 100 prints it was almost the same so with the temp we are ok.

is there a way to make the machine move only the belt cleaning unit to see if it will empty from waste toner?

[blackcat4866]

Re: Bizhub C7000 belt waste toner collection unit problem

If you're satisfied that the temperature is in the 20C ,I think I'd focus on the auger system:

[Aeg Print]

Re: Bizhub C7000 belt waste toner collection unit problem

The problem is that i don't know where else to look!
the cleaning unit is new, the pipe system works (waste toner drops in the box)
is there a way to diagnose from inside the service menu if everything works ok in the waste toner system ?

[subaro]

Re: Bizhub C7000 belt waste toner collection unit problem

The problem is that i don't know where else to look!
the cleaning unit is new, the pipe system works (waste toner drops in the box)
is there a way to diagnose from inside the service menu if everything works ok in the waste toner system ?

Go to section 9.2 of the service manual and see the Theory of operation for the TONER COLLECTION SYSTEM. It outlines the all the systems and parts involved in the extraction of the waste toner from BOTH the transfer belt AND the drums.
There is something called the belt collection cam, which I think is a mechanism that moves up and down that transport the toner from the belt collection screw[ augur ] to the lower horizontal screw. If that is not working, which I suspect, then the toner would not be extracted from the belt screw. number 8 on the part names

The toner you are seeing in the waste box is from the Drum waste which then goes into the vertical pipe system.

Edit. Just thought of this to do before you go to the pipes. Clean out the belt collection unit and turn the augur by hand and make sure its turning. when you attach it back to the belt, turn the belt by hand in the correct direction and see that the augur is turning at the waste toner end. This way you verify that the belt extraction toner collection system is working. The belt motor with its gear arrangement is turning the belt toner waste extraction or collection unit.
You have to verify this first.

I am done with this thread.....

You have to examine these parts and see how it is working.

2.2.16 Belt collection pipe, Vertical conveyance pipe, Horizontal conveyance pipe
(1) Procedure



see this section of the service manual for a good how to remove,examine and reinstall the waste pipes.

Did you actually look at the service manual. It explain this clearly. I got the manual online, and downloaded it to take a look at your problem. This should not be a so difficult problem to fix, just follow the instruction exactly.

Note Turn the transfer belt by hand in the right direction and make sure you see the augur where the toner exit is turning first before you examine the pipes
Done with this thread

[Aeg Print]

Re: Bizhub C7000 belt waste toner collection unit problem

if you see my 1rst post i explained that i took out the whole front pipe system, cleaned and reinstalled it, checked that waste toner travels to the box and that all inlets are clean (with the manual instructions of course!)
i suspect that the problem is on the gears that drive the cleaning unit on the belt but i cannot find a way to check that they are working correct.

Toner builds up only inside the belt cleaning unit. the other pipes are clean and the inlets also.

[subaro]

Re: Bizhub C7000 belt waste toner collection unit problem

if you see my 1rst post i explained that i took out the whole front pipe system, cleaned and reinstalled it, checked that waste toner travels to the box and that all inlets are clean (with the manual instructions of course!)
i suspect that the problem is on the gears that drive the cleaning unit on the belt but i cannot find a way to check that they are working correct.

Toner builds up only inside the belt cleaning unit. the other pipes are clean and the inlets also.

Ok then. You may have to remove the transfer belt itself to see the gears that drive the cleaning unit and turn them by hand. The motor that drive those gears may have to be removed for the g ear to turn freely. I never worked on those and have not seen that unit, but just going by theory anyway. First, must determine what drives the transfer toner collection gear and inspect that mechanism, otherwise it would be hard to tell.

remove the belt collection unit again, clean it again, or replace it. Reinstall it and use the belt power as it says in the service manual to prime the toner collection roller.
The bizhub guys out there would have to tell you how this works as to the practical workings.

[tulintron]

Re: Bizhub C7000 belt waste toner collection unit problem