Canon 7095 Light Prints on Damp Paper

[Berean]

Hello Everyone,

I have a Canon 7095 Image Runner that prints really well as long as I keep the paper extremely dry. If I leave paper out at all for much time, the 7095 will have very faint 1 1/2- 2 inch streaks that will barely print anything. Mostly only on one side of the paper. I have several other Canon Image Runners, 9065, 5185, 6570, 3200, and none of them have this issue. I live in a moderately humid area in Oklahoma, but it really is not bad. I don't understand why the 7095 has so much of an issue with semi-damp paper.

It is so bad, that I do not dare leave any paper in the machine over night. I remove it and store it in the original waxy paper cover that reams of paper come in. As long as I store them in the original paper sleeves, the printer works fine the next day. But if I leave a small stack of paper in the machine overnight, the next day that paper will not print properly in my 7095. The same paper will print fine in all of my other image runners. I am hoping someone might know of a setting that can be changed on the machine that will allow it to print slightly moist paper. Any help on this would be greatly appreciated.

Thank you so much.

Berean

[dan7777]

Re: Canon 7095 Light Prints on Damp Paper

Hello Everyone,

I have a Canon 7095 Image Runner that prints really well as long as I keep the paper extremely dry. If I leave paper out at all for much time, the 7095 will have very faint 1 1/2- 2 inch streaks that will barely print anything. Mostly only on one side of the paper. I have several other Canon Image Runners, 9065, 5185, 6570, 3200, and none of them have this issue. I live in a moderately humid area in Oklahoma, but it really is not bad. I don't understand why the 7095 has so much of an issue with semi-damp paper.

It is so bad, that I do not dare leave any paper in the machine over night. I remove it and store it in the original waxy paper cover that reams of paper come in. As long as I store them in the original paper sleeves, the printer works fine the next day. But if I leave a small stack of paper in the machine overnight, the next day that paper will not print properly in my 7095. The same paper will print fine in all of my other image runners. I am hoping someone might know of a setting that can be changed on the machine that will allow it to print slightly moist paper. Any help on this would be greatly appreciated.

Thank you so much.

Berean

If your transfer/sep assembly has not been replaced in a while try that. Or if there is a setting you can try increasing the voltage if there is a setting, I recommend replacing unit. I never had any of those machines but the other models the transfer wire gets old and the voltage is high there and what ever oxidation insulates the transfer charge. Water is an insulator and you have to over power that to transfer toner to the paper.

[Phil B.]

Re: Canon 7095 Light Prints on Damp Paper

if you have the old tube style computer screen you can take your paper and sit it on top for an hour or two.. that should rid the paper of moisture .. .I would also suggest storing the unused ream in a big ziplock baggie... maybe store a pac of desiccant or even an old part of pantyhose with whole uncooked rice in the bag with the paper.

[Berean]

Re: Canon 7095 Light Prints on Damp Paper

If your transfer/sep assembly has not been replaced in a while try that. Or if there is a setting you can try increasing the voltage if there is a setting, I recommend replacing unit. I never had any of those machines but the other models the transfer wire gets old and the voltage is high there and what ever oxidation insulates the transfer charge. Water is an insulator and you have to over power that to transfer toner to the paper.

Thank you for that. Are you talking about the Transfer Separation Corona Unit?

Canon FG6-8733-050 (FG6-8733-040) Transfer Separation Corona Unit, Genuine (A7986).

Thank you so much for your help.

[teckat]

Re: Canon 7095 Light Prints on Damp Paper

Thank you for that. Are you talking about the Transfer Separation Corona Unit?

Canon FG6-8733-050 (FG6-8733-040) Transfer Separation Corona Unit, Genuine (A7986).

Thank you so much for your help.

---

is issue on Prints and Copies
if only on Prints-------------------------go to Level 2 Service Mode > Copier > Option > User > PR-D-SEL > from 4 (default) to 6.

buy a large Rubbermaid locking handle container> keep paper inside -- tested and works in humid environments

why a 7095 reacts to this issue-- needs investigation

After the start of the copy job enter service mode under display select DPOT and check VLT and VLM. VLT (voltage light target) should be around 75 and VLM(voltage light measured) should also be near 75.

With this problem VLM may read around 200, this means there is not enough discharge of the drum.

[Berean]

Re: Canon 7095 Light Prints on Damp Paper

---

is issue on Prints and Copies
if only on Prints-------------------------go to Level 2 Service Mode > Copier > Option > User > PR-D-SEL > from 4 (default) to 6.

buy a large Rubbermaid locking handle container> keep paper inside -- tested and works in humid environments

why a 7095 reacts to this issue-- needs investigation

After the start of the copy job enter service mode under display select DPOT and check VLT and VLM. VLT (voltage light target) should be around 75 and VLM(voltage light measured) should also be near 75.

With this problem VLM may read around 200, this means there is not enough discharge of the drum.

Thank you so much for your help on this. I do not know if it does this on copies, because I never use it for copying. I only print. Thank you for the rubbermaid trick. I will check the info on the things you shared. I found this in the service manual. I have not tried it yet though.

SERVICE MODE:
- COPIER> OPTION> BODY> FUZZY (enabling/disabling fuzzy control)
0: enables fuzzy control (default)
1: low humidity environment mode (the transfer current is lower than standard)
2: normal humidity environment mode
3: humidity environment mode (the transfer current is higher than standard)
If set to '1' through '3', the control will be independent of the environment sensor.

I found this also:

SERVICE MODE:
- COPIER> OPTION> BODY> TRNSG-SW (transfer guide bias control mode switchover)
0: switches to +200 V in a high-humidity environment (default)
1: fix the transfer guide bias to +600 V
2: fix the transfer guide bias to +200 V
3: switches to +200 V in a normal humidity condition
4: switches to +200 V in a low humidity condition
Set it to '2' through '4' if a transfer fault is noted.


I really appreciate all the help you guys have been giving. May the Lord bless you richly.

[dan7777]

Re: Canon 7095 Light Prints on Damp Paper

Thank you for that. Are you talking about the Transfer Separation Corona Unit?

Canon FG6-8733-050 (FG6-8733-040) Transfer Separation Corona Unit, Genuine (A7986).

Thank you so much for your help.

Yes, not saying it will fix it but that is what I would try and replace.

[zoraldinho]

Re: Canon 7095 Light Prints on Damp Paper

I remember tensioning new corona wires on a field....


A6562.wh.jpg

[charm5496]

Re: Canon 7095 Light Prints on Damp Paper

I still string those bad boys all the time. New hires have no idea

[spectraindo]

Re: Canon 7095 Light Prints on Damp Paper

I have met this problem before, use the service mode :

SERVICE MODE:
- COPIER> OPTION> BODY> TRNSG-SW (transfer guide bias control mode switchover)
0: switches to +200 V in a high-humidity environment (default)
1: fix the transfer guide bias to +600 V
2: fix the transfer guide bias to +200 V
3: switches to +200 V in a normal humidity condition
4: switches to +200 V in a low humidity condition
Set it to '2' through '4' if a transfer fault is noted.

Set it to "1'" because humid paper will leak the Transfer high voltage and cause transfer problems.
You can also check the Upper and Lower Pre Transfer Guides FF5-7878 and FF6-1053, they are covered with a protective sheet, if it is torn, replace them.

[Herrmann]

Re: Canon 7095 Light Prints on Damp Paper

First at all, after replacing the corona or the wires on a canon box, do not forget to reset the counters in service mode, otherwise the mashine wont use the correct corona currents.
second: turn the trans/sep corona 180 degrees and turn the transfer wire screws 1,5 turn counterclockwise, the two sep wires 1 turn clockwise. After that, reinstall. This will increase the transfer performance and reduce toner repulsion due to sep current

Hope this helps

[Berean]

Re: Canon 7095 Light Prints on Damp Paper

First at all, after replacing the corona or the wires on a canon box, do not forget to reset the counters in service mode, otherwise the mashine wont use the correct corona currents.
second: turn the trans/sep corona 180 degrees and turn the transfer wire screws 1,5 turn counterclockwise, the two sep wires 1 turn clockwise. After that, reinstall. This will increase the transfer performance and reduce toner repulsion due to sep current

Hope this helps

Thank you for this answer. I have turned up the transfer guide bias to +600 V according to these instructions:

SERVICE MODE:
- COPIER> OPTION> BODY> TRNSG-SW (transfer guide bias control mode switchover)
0: switches to +200 V in a high-humidity environment (default)
1: fix the transfer guide bias to +600 V
2: fix the transfer guide bias to +200 V
3: switches to +200 V in a normal humidity condition
4: switches to +200 V in a low humidity condition
Set it to '2' through '4' if a transfer fault is noted.

As of right now it seems to be working, but I have only tested it one day. I still got some faint prints today, but only on the first three sheets. I had left almost one full ream in the machine overnight, and it all printed good today except for the first three sheets.

Now, I have changed all of the corona wires on a 6570 I used to have. So far on this 7095 I have not changed any corona wires, but I am happy to give it a shot. I have a spool of wire. However, your instructions are confusing to me. I do not understand how to turn wires 180 degrees, nor turn the screws 1,5 turns clockwise. Is that 1/5th of a turn? Which screws are you talking about specifically? I was told by a technician who serviced my 6570 machine that the wires surrounding the Transfer Separation Corona Unit are not necessary, that all that matters are the long straight ones going from the operator side of the machine to the back. Is that correct? When you change the wires on this do you ignore the wire wrapping around the unit?

Thank you so much for your help. I am not a technician, but I do almost all of my own work on my machines. Diagnosing is the hardest part.

I appreciate you guys. You are very helpful.

[techandtrader]

Re: Canon 7095 Light Prints on Damp Paper

If the machine is run hard and quality is important....and the assemblies have around 500 -1 million clicks you should just buy a new assembly anyway. Age and meters around 1 million call for new ones anyway. Esp in a production environment. imo Has the drum ever been polished?

[Herrmann]

Re: Canon 7095 Light Prints on Damp Paper

I do not understand how to turn wires 180 degrees, nor turn the screws 1,5 turns clockwise. Is that 1/5th of a turn?

not the wires, turn the whole corona assy upside down, there you will see plastic screws, wich adjust the heigt of the corona wires. with 1.5 turns i meant one and a half turn.

[Berean]

Re: Canon 7095 Light Prints on Damp Paper

If your transfer/sep assembly has not been replaced in a while try that. Or if there is a setting you can try increasing the voltage if there is a setting, I recommend replacing unit. I never had any of those machines but the other models the transfer wire gets old and the voltage is high there and what ever oxidation insulates the transfer charge. Water is an insulator and you have to over power that to transfer toner to the paper.

That helped a lot. I replaced every corona assembly on the 7095, and now I can leave paper in there for weeks and it will print properly. You guys are such a help for this. Thank you so much.