blue/grey scans 2505AC

[doxtar88]

Good morning,
We have a 2505AC with an MR4000. When making a single-sided copy from the document feeder, the document appears blue from the middle up, with the last strip having a grey background.

We've checked to make sure no light is entering the scanner, replaced the feeder, and also cleaned the mirrors, all without success.

The odd thing is that if you make the copy from the glass, it comes out fine, but if you make it from the feeder, it comes out like i say, and theoretically they use the same glass as the optical one. The only difference is that when making it from the feeder, it uses the narrow mirror, which we also replaced.

Do you know what this could be, or have you encountered a similar case? I'm attaching an image of the scanned document

Thanks everyone!

DOC020425-02042025124343.pdf

[Vincent128]

I would say to re-do all the dimensional adjustments per the service manual. Looks like the height adjustment in particular.

[Rusty.Harris]

One other thing to check. Image position of the scanner. In the photo below, as the document feeds through the document feeder, the scanner mirrors need to be dead center under the contact position of the document. If the scanner is under the "gold" arrow, it's perfect. If it is too far to the left (red arrow) you can pick up shadows. If it is too far to the right (blue arrow) it can cause shadows. Before they added the black plastic strip to the scanner to prevent debris from causing lines on the copies, I would move the scanner position when using the ADF just a bit one way or the other so it would be out of the debris field. If you get it too far one way or the other, you will get a shadow.

Untitled-1.jpg

Another thing to check is the height of the DSDF. If the height adjustment is too far to the rear, it can cause the document to not be flat against the glass, resulting in shadows.

Screenshot 2025-04-02 182627.png

[doxtar88]

I think it's not the height since changing the feeder doesn't solve the problem. But i will check again.

What you're saying about the image sounds very interesting, Rusty, but I can't quite understand it. You're saying you're changing the position of the scanner's mirrors?

[blackcat4866]

If you did not do the height adjustment, you will not know if the height is correct. Switching DF's tells you nothing if you did not do the adjustment either time. Both could conceivably be out of adjustment.

[Rusty.Harris]

I think it's not the height since changing the feeder doesn't solve the problem. But i will check again.

What you're saying about the image sounds very interesting, Rusty, but I can't quite understand it. You're saying you're changing the position of the scanner's mirrors?

Changing the position of the mirrors where they stop under the slit glass. 05-3035, default is 133 I think.

[mojorolla]

"The odd thing is that if you make the copy from the glass, it comes out fine, but if you make it from the feeder, it comes out like i say, and theoretically they use the same glass as the optical one. The only difference is that when making it from the feeder, it uses the narrow mirror, which we also replaced"

Using the ADF uses only the slit glass, not the platen glass; just found this wording odd....
What happens when a 2-sided document is run from the ADF? Does the second side show the same defect? If not, what does the slit glass look like as side 2 is handled by the CIS slit glass inside the ADF.

Another thing I noticed is that the background is cyan and there is stretching in your example. The stretching is also fracturing the light into its 7 colors, indicating bad slit glass.
What happens when you scan in black and white?

[doxtar88]

Thanks everyone for the replies.
I'll try to go to the customer today to check the height and mirror adjustments and let you know.

Apparently, it works fine in black and white. i'll check that too.

[doxtar88]

"The odd thing is that if you make the copy from the glass, it comes out fine, but if you make it from the feeder, it comes out like i say, and theoretically they use the same glass as the optical one. The only difference is that when making it from the feeder, it uses the narrow mirror, which we also replaced"

Using the ADF uses only the slit glass, not the platen glass; just found this wording odd....
What happens when a 2-sided document is run from the ADF? Does the second side show the same defect? If not, what does the slit glass look like as side 2 is handled by the CIS slit glass inside the ADF.

Another thing I noticed is that the background is cyan and there is stretching in your example. The stretching is also fracturing the light into its 7 colors, indicating bad slit glass.
What happens when you scan in black and white?

Hi guys,

When i do 2 sided it works fine for the second side so the glass of the ADF its working fine, its just wrong when for the first side when you copy from the ADF but not from the machine without using the ADF.

About copying in black and white the result its the same with the black shadow, but the cyan part disappear.

Today I tried several settings. First, I played with the height, but it didn't seem to change.

Then I tried the 5-3035 setting, but that didn't help either.

The slit glass was also replaced.

I really don't know what to do, this thing has me confused.

[djbass]

I will repeat what most of the others are saying, you will want to check in the following order, Alignment of the DSDF (using the provided alignment pins attached to the plate covering the two hinges), adjust the height (using screw on the left hinge), adjust DSDF angle (using screw on the right hinge).

As a last resort, that kind of backgrounding can also be caused by misalignment of the scanner mirrors, there are adjustment screws on the front and back of the scanner mirrors, you only want to turn them in or out very slightly, once adjusted it can be very hard to get them perfectly aligned again, and overadjusting them tends to result in an all black image, it's really something you only want to do after you've tried everything else.

[doxtar88]

Good morning, guys.
Today I finally found the time to get back to the client with the problem.
After adjusting everything, I finally came to the conclusion that it could only be the mirror with the screw, so I dared to touch it.

After a long time counting the millimeters that the screw turned, I was able to adjust it with an almost imperceptible gray background, at least imperceptible to the customer's eyes.

It's not perfect, but it took me a long time and I think it would be really hard to achieve perfection.

Really thanks to all for the help i would never have touched that screw without your advice.
And Toshiba just told me to adjust the height whenever I asked.

Thanks again guys.

[Vincent128]

I personally have never had to mess with any of the optics mirrors on these..wonder if the machine took a tumble or was ham-fisted....
Good job man.

[jonwill]

Did you use calibration procedure for the document feeder using the printed test charts in 05 mode ?

[doxtar88]

Did you use calibration procedure for the document feeder using the printed test charts in 05 mode ?

I didn't think it was necessary since the image was well reproduced in size, it was simply a background problem.

[Rusty.Harris]

Hi guys,

When i do 2 sided it works fine for the second side so the glass of the ADF its working fine, its just wrong when for the first side when you copy from the ADF but not from the machine without using the ADF.

Ok, I'm going to default to my "this machine is doing something weird" fix.
I've seen some really screwball issues caused by the memory card. Off glass ok, through ADF bad. Off glass blank, through ADF bad and on and on.
pull the memory card from the system board, clean the contacts & blow some canned air up into the card slot. Clean as much dust from the board and
the fan. Reinstall the memory card. When powering on, hold down the energy saver key. See if that corrects it or makes any difference.
"Tin whiskers" or just a bad memory card can give you all sorts of whack-a-doodle problems.