Canon C1 4 color dots across page

[Penvy]

Cant figure out these small dots Y-M-C-K left to Right , printing in color
in that order about 1/8" apart never in the same area but on same line
repeats on 11x17 same line as if it was on the drum rotation.

Replaced the Drum and ITB same thing!
Not Drum or ITB!
New drum
New Itb
Very clean inside
Dev units good
Laser?

print blank page and no dots!
Print B&W Just the Black dot same line
Print from server color ,same thing 4 dots
print from Scanner color, same thing 4 dots y-m-c-k

Print 12X18 and more dots same line and little bigger dot

Great color just the dots
HELP!

[zoraldinho]

HI Penvy.

My opinion is primary corona issue.First change corona grid,if no better replace corona assy.

[SCREWTAPE]

Do they look like this. The dots are created by pit marks on the Drum caused by contamination in the Developer Units. Or a bad drum. But you change the drum right.

[Penvy]

Yes this is it,
New drum
Dev units restarted, cleaned less that 100k
New ITB
And did the inst4 for the Dev units

these dots were exactly the same before the drum change
Everything was cleaned top to bottom.
I will inspect the New drum but the dots were there before and that same.

[Penvy]

This drum was brand new.
And i did find a pit mark
I did everything by the book.
You have to turn on the mach to get it started to reset.
Did what the manual said to reset

New Carona wire and Grid w/less that 5K

The contamination from the Dev units?
there not even 100k and have been cleaned and restarted I mean VERY clean!!!
good brush and color was great.
Pitting a brand new drum. or was the Drum defective?


This C1 is a real POS
But what great color when it works
This is where I really need some advice on this drum issue
And replacement

What did I do wrong?

[teckat]

This drum was brand new.
And i did find a pit mark
I did everything by the book.
You have to turn on the mach to get it started to reset.
Did what the manual said to reset

New Carona wire and Grid w/less that 5K

The contamination from the Dev units?
there not even 100k and have been cleaned and restarted I mean VERY clean!!!
good brush and color was great.
Pitting a brand new drum. or was the Drum defective?


This C1 is a real POS
But what great color when it works
This is where I really need some advice on this drum issue
And replacement

What did I do wrong?

Four Scratch Marks Caused by the Pre-Transfer Corona and Four Dots Caused by a Foreign Object

The Four Dot Marks reproduced on prints are a result of foreign object in the Developing Assembly, Drum
Cleaning Assembly and in some cases, the Image Scan Patch Sensor. This foreign object strikes the Drum
during the development process, damaging the Drum.

Four Scratch Marks:
The Four Scratch Marks reproduced on prints are as a result of the rear guide on the Pre-Transfer Corona
breaking, causing the Pre-Transfer Corona to drop down scratching the Drum.
The Scratch Marks look
similar to the Four Dot Markings and can be easily mistaken for the Four Dot issue.

The Four Dot Marks can be resolved by vacuuming the Developer Assemblies, Cleaning Assemblies and
opening and cleaning the Image Scan Patch Sensor.
READ PDF BELOW
C1-TP09-2.pdf

[Penvy]

All of that was done,
really cleaned the heck out of the Dev units and everything in the drum and dev areas

replaced the seals and cleaning blades

Patch sensors
Everything
And theres those friggin dots just like you showed in the PDF
at the bottom.

This is really heartbreaking to spend all this money and time just to see this fail from a fresh start by replacing almost everything
except the copier itself.

The Dev units dont even have 80K but have been cleaned very carefully and use the right starter and resetting the drum and inst-4 for the dev units
the prim wire is new and grid cleaned.

very careful on install.
but right from the start this pit in the drum first time.

how can you even repair this when its all new?

the Dev units are as clean as brand new.

The image patch sensor and everything top to bottom was vac cleaned spotless soon as you turn on this goes into the auto gradation even befor you can start to set up the new parts.
what gives here?

I did everything that tech memo said to do.
How do you replace a drum then??????

no foreign objects on a clean mach

where?
very frustrated with this

[teckat]

once the Drum is pitted that is it, no repair


REPLACE THE GUIDE/ IT IS WARPED
pre-transfer corona guide is the issue/ u need to replace the guide / it's the position of the guide when u slide in corona unit/

the end block hits drum when u push it in

[zoraldinho]

once the Drum is pitted that is it, no repair


REPLACE THE GUIDE/ IT IS WARPED
pre-transfer corona guide is the issue/ u need to replace the guide / it's the position of the guide when u slide in corona unit

the end block hits drum when u push it in

Nail on the head.95%.


images1.jpg

[Penvy]

I understand that guide,
No I am aware of that and its not warped and what it is pushed in very slow and deliberate.
Top and bottom .
This is a pit that looks as if it was an arc.
But just shoot me.
SHIT

[teckat]

I understand that guide,
No I am aware of that and its not warped and what it is pushed in very slow and deliberate.
Top and bottom .
This is a pit that looks as if it was an arc.
But just shoot me.
SHIT

even if u push in the corona very slow/ for some reason it rises up and hits drum/ & replaced guide over ten times already /

primary blocks can have ARC marks/ inspect

[Penvy]

This ones just kicking my ass I will inspect carefully top and bottom carona's
the old drum had them too
Brand new drum.SHHHHITTTT.

Been doing this a long time and by far this C1 just is the worst in overall design
Great color, slow but really beautiful color match
but just a real POS to keep running.

Canon really messed up with this one
Just too easy to break on its own.

the best I have seen is 60K before meltdown

The top guide is very secure and little movement
The bottom one just did not feel any contact.

[SCREWTAPE]

I hear ya on the C1.

Wait till work on the Advance models.

You will love it.

[Penvy]

Lets review this clusterF of a mach

New prim and grid 5K ago
New pre wire 5K
Dev restarted and very clean
Clean toner path tubes to the hopper
Even pulled the doctor blade inside Gap to 80Lb Business card paper for proper brush
Clean ATR and DEV assy

HV prim 999
Grid 464

Inst-4 for Dev
NewITB and cleaned rollers and cleaning rollers
new drum w/all new seals and cleaning blade

Reset Drum
printed full p5 color to get Dev dens
no errors
very careful on install of prim and pre

ITB reset
DFC
Dev inst-4
drum potential
very clean on inside pathway and frame
I just dont see how the carona slide very slow install even touched the drum
Just this little pin hole with the 4 dots on the print

Somewhere this drum got a spike from somewhere
What am i missing other that another new drum

[teckat]

if u work for an authorized dealer, call Canon tec. support>explain issue of pin hole in Drum, document your findings with copies & test prints & copy of service log. They will issue a new Drum, but they will recommend u replace all four developers.

I used to Call a friend in Canon Engineering, but he has since left. I will call them tomorrow to see if I can get some more info on this pin hole dilemma.


<High Primary corona output can cause a pinhole in Drum>