Canon IR7105 Light Image using A4.

[tinnyjay]

Hello!
I am having light image in 1/3 of A4 in the feed direction.
This happens both in one sided and two sided pages,copying and printing.
In A4-R it works great and i dont have the smaller problem.
I think its Developer Bias problem,but i dont know what cause that.
I can enter SP Mode when i am printing a book in A4 and go to Display-HV-STS and see the current voltages that apply in coronas and developer bias.
BIAS there sometimes count 0 and in that moment if i see the printed pages,it is light.
In A4-R,BIAS never count 0,only when printing finishes.I removed developer unit and cleaned and espected and i didnt find a problem there.The toner was perfectly layered on the mag roller and the density was the same all over.
Maybe i am wrong,but that could help you.
I am uploading an image here(sorry for low quality) :
test.jpg

[teckat]

Re: Canon IR7105 Light Image using A4.

Hello!
I am having light image in 1/3 of A4 in the feed direction.
This happens both in one sided and two sided pages,copying and printing.
In A4-R it works great and i dont have the smaller problem.
I think its Developer Bias problem,but i dont know what cause that.
I can enter SP Mode when i am printing a book in A4 and go to Display-HV-STS and see the current voltages that apply in coronas and developer bias.
BIAS there sometimes count 0 and in that moment if i see the printed pages,it is light.
In A4-R,BIAS never count 0,only when printing finishes.I removed developer unit and cleaned and espected and i didnt find a problem there.The toner was perfectly layered on the mag roller and the density was the same all over.
Maybe i am wrong,but that could help you.
I am uploading an image here(sorry for low quality) :
[ATTACH=CONFIG]20147[/ATTACH]

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

u keep posting on same issue---------


Perform a panic stop and check the image on the drum
IF LIGHT/ on effected area> clean Laser Dust Proof Glass -then adjust the laser power



Check for a warp in the cover that actuates the laser shutter, the laser shutter will not open completely and cause uneven density. Replace the cover /FF6-2849-000/to corrected the uneven density.
To verify if the cover is causing the light image cheat the front door interlock and press on the cover. If image density is improved replacement of the cover is required.

Check to see if the Lower Transfer Guide is too low.
There are two adjusting posts that are slotted. These posts adjust the height of the Lower Transfer Guide. Check to see if the posts are at the mid-point. They may be all the way to the left (lowest setting). If they are, loosen the locking screw and move to the mid-point position. Take care when tightening the rear screw, over tightening will cause guide to move to the lowest position. If you move the post to far to the right, the blur may shift to the lead edge.


1-DRUM
2- Laser
3-Potential Control
4-DC Controller

[teckat]

Re: Canon IR7105 Light Image using A4.

Hello!
I am having light image in 1/3 of A4 in the feed direction.
This happens both in one sided and two sided pages,copying and printing.
In A4-R it works great and i dont have the smaller problem.
I think its Developer Bias problem,but i dont know what cause that.
I can enter SP Mode when i am printing a book in A4 and go to Display-HV-STS and see the current voltages that apply in coronas and developer bias.
BIAS there sometimes count 0 and in that moment if i see the printed pages,it is light.
In A4-R,BIAS never count 0,only when printing finishes.I removed developer unit and cleaned and espected and i didnt find a problem there.The toner was perfectly layered on the mag roller and the density was the same all over.
Maybe i am wrong,but that could help you.
I am uploading an image here(sorry for low quality) :
[ATTACH=CONFIG]20147[/ATTACH]

================================

another test //is to reduce the A4 DOCUMENT to 50% > check image on copy & drum

[tinnyjay]

Re: Canon IR7105 Light Image using A4.

================================

another test //is to reduce the A4 DOCUMENT to 50% > check image on copy & drum

Teckat,thank you for your replies.
I am wandering why BIAS set to 0 time after time when using A4 and dont do this when i am using A4-R.
I just take this picture when copier was printing a book using A4 and developer bias set to 0.
Photo0035.jpg

[teckat]

Re: Canon IR7105 Light Image using A4.

Teckat,thank you for your replies.
I am wandering why BIAS set to 0 time after time when using A4 and dont do this when i am using A4-R.
I just take this picture when copier was printing a book using A4 and developer bias set to 0.
[ATTACH=CONFIG]20150[/ATTACH]

==========================================
Grid bias==DC constant voltage control: determined by potential control--The grid bias is determined so that the drum surface potential will be identical to the target potential. (The primary charging bias is set to a fixed value.)

Developing bias DC==DC constant voltage control: determined by potential control

Developing bias AC==AC constant voltage control: switched over (frequencies) in service mode

Dust-collecting Bias roller==DC constant voltage control: on/off control only (+1000 V)

Transfer guide bias control== DC constant voltage control: switched over according to temperature/humidity
(high-humidity environment +200 V, low/normal environment +600 V)

Potential control==
[1] determines grid bias
[2] sets optimum laser output
[3] sets optimum developing bias (DC)


Density adjustment during printing (PDL input)
Purpose==To enable reproduction of fine lines suited to the needs of the user (PDF data from a PC).
Correction==Corrects the laser power/developing bias to suit the F value setting.

Density adjustment during printing (scanner input)
Purpose==To enable a specific level of density suited to the needs of the
user.
Correction==Corrects the laser power/developing bias to suit the F value setting

[teckat]

Re: Canon IR7105 Light Image using A4.

Teckat,thank you for your replies.
I am wandering why BIAS set to 0 time after time when using A4 and dont do this when i am using A4-R.
I just take this picture when copier was printing a book using A4 and developer bias set to 0.
[ATTACH=CONFIG]20150[/ATTACH]

==========================================
look at these settings under------
COPIER > DISPLAY > DPOT



Grid bias==DC constant voltage control: determined by potential control--The grid bias is determined so that the drum surface potential will be identical to the target potential. (The primary charging bias is set to a fixed value.)

Developing bias DC==DC constant voltage control: determined by potential control

Developing bias AC==AC constant voltage control: switched over (frequencies) in service mode

Dust-collecting Bias roller==DC constant voltage control: on/off control only (+1000 V)

Transfer guide bias control== DC constant voltage control: switched over according to temperature/humidity
(high-humidity environment +200 V, low/normal environment +600 V)

Potential control==
[1] determines grid bias
[2] sets optimum laser output
[3] sets optimum developing bias (DC)


Density adjustment during printing (PDL input)
Purpose==To enable reproduction of fine lines suited to the needs of the user (PDF data from a PC).
Correction==Corrects the laser power/developing bias to suit the F value setting.

Density adjustment during printing (scanner input)
Purpose==To enable a specific level of density suited to the needs of the
user.
Correction==Corrects the laser power/developing bias to suit the F value setting

[tinnyjay]

Re: Canon IR7105 Light Image using A4.

==========================================
look at these settings under------
COPIER > DISPLAY > DPOT



Grid bias==DC constant voltage control: determined by potential control--The grid bias is determined so that the drum surface potential will be identical to the target potential. (The primary charging bias is set to a fixed value.)

Developing bias DC==DC constant voltage control: determined by potential control

Developing bias AC==AC constant voltage control: switched over (frequencies) in service mode

Dust-collecting Bias roller==DC constant voltage control: on/off control only (+1000 V)

Transfer guide bias control== DC constant voltage control: switched over according to temperature/humidity
(high-humidity environment +200 V, low/normal environment +600 V)

Potential control==
[1] determines grid bias
[2] sets optimum laser output
[3] sets optimum developing bias (DC)


Density adjustment during printing (PDL input)
Purpose==To enable reproduction of fine lines suited to the needs of the user (PDF data from a PC).
Correction==Corrects the laser power/developing bias to suit the F value setting.

Density adjustment during printing (scanner input)
Purpose==To enable a specific level of density suited to the needs of the
user.
Correction==Corrects the laser power/developing bias to suit the F value setting

I found the problem
It was Transfer\Separation Corona Unit.Swapped from another machine and its ok.
But,Teckat,please can you explain a little more clearly the registration of transfer corona,because i didnt understand very well.
Thanks

[teckat]

Re: Canon IR7105 Light Image using A4.

It's all about the environment/ each printer has it's own/ even when two or more in same room


Transfer
The following items are associated with the machine's transfer charging control system:
[1] DC bias constant current control

[2] output control to suit the environment (fuzzy control)
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.

[3] output control at the trail edge of paper
When copy paper moves in contact with the transfer charging assembly, the resistance of the assembly drops abruptly as soon as the paper leaves, possibly permitting discharge current to flow momentarily, causing transfer faults or image smears along the trail edge of the image. The machine is designed to correct (decrease) the transfer current to prevent these faults.
SERVICE MODE:
- COPIER> OPTION> BODY> TRSW-P-B (enabling/disabling transfer current output correction control)
1: does not vary the transfer current value (default)
(transfer faults occurring along the trail edge of paper)
0: corrects the transfer current value along the trail edge of paper


The transfer current varies according to the potential of TRANSFER_CNTR
The transfer current output is optimized to suit the environment (data for the environment sensor).


The transfer guide bias is optimized to suit the environment (identified with reference to the data from the environment sensor).
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

Separation
[1] DC bias constant current control
[2] AC bias constant voltage control
[3] output correction to suit the environment and deposit of toner (fuzzy control)
[4] output correction after detection of leakage

The separation current output in optimized according to the environment (as identified based on the data from the environment sensor) and the deposit of toner (3 levels: low, standard, high).
In a low humidity environment, the paper tends to be dry, encouraging charges to collect (high resistance).
The machine decreases the output.

If the deposit of toner is limited, the machine increases the output to prevent separation faults.

SERVICE MODE:
- COPIER> OPTION> BODY> SP-MODE (enabling/disabling separation current output correction control)
0: standard mode (AC output is 10.0 kVpp, default)
1: low voltage mode (AC output is 9.0 kVpp; if error is frequent because of leakage)

[Henry]

Re: Canon IR7105 Light Image using A4.

Good day Teckat,

When replacing corona wires, do I need to replace the complete set in one time? And what are the basis of replacement?

Thanks

[teckat]

Re: Canon IR7105 Light Image using A4.

Good day Teckat,

When replacing corona wires, do I need to replace the complete set in one time? And what are the basis of replacement?

Thanks

=======================================

u never replaced corona wires before


the silicon gas (vapor of silicone oil from the fixing assembly) tends to soil the corona charging wire, reducing its life. This is particularly true of a low humidity environment.)

As many as 3 charging wires are found around the photosensitive drum (primary, pre-transfer, transfer/separation); these wires are 0.06 mm in diameter.
As a rule, the charging wire (except the grid wire) may be strung in the same way for all charging assemblies.

read--------iR7105_Corona Wire.pdf


use your brain on assembly's (if needed at 1,000,000)
Replace wire every 250,000 pages in a high temperature / humidity environment. If normal temperature with low
humidity environment then replace every 400,000 pages.


Primary Gird Wire/ FY1-0883-000
Post wire/ FB4-3687-000

[Henry]

Re: Canon IR7105 Light Image using A4.

=======================================

u never replaced corona wires before


the silicon gas (vapor of silicone oil from the fixing assembly) tends to soil the corona charging wire, reducing its life. This is particularly true of a low humidity environment.)

As many as 3 charging wires are found around the photosensitive drum (primary, pre-transfer, transfer/separation); these wires are 0.06 mm in diameter.
As a rule, the charging wire (except the grid wire) may be strung in the same way for all charging assemblies.

read--------[ATTACH]20235[/ATTACH]


use your brain on assembly's (if needed at 1,000,000)
Replace wire every 250,000 pages in a high temperature / humidity environment. If normal temperature with low
humidity environment then replace every 400,000 pages.


Primary Gird Wire/ FY1-0883-000
Post wire/ FB4-3687-000

very informative and detailed instructions, thanks for your help.