ADF of Minolta C450 is not working

If it physically doesn't go through, try to push a heavy stock card or decent thick laminated paper and try to feed it through. There maybe a mylar (plastic sheet) flipped backwards or a piece of debree stuck in paper path of your Document Feeder. This may resolve 80% of issue.
The rest could be broken sensor flag (actuator) or dirty sensor that is not reading the paper passage (or it the sensor is faulty all together)
The amount of staples, paper clips, Bluetag and other junk I pulled from ADF over the years..Bucket loads :)
Good luck.

Konica Questions answered here ' FixYourOwnPrinter

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Konica Minolta paper jam adf scanner Questions & Answers ...

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Konica Minolta bizhub document feeder not working ...

When you say the rear tray what do you mean, ON the document feeder tray or raising the document feeder up placing the document on the big glass. Never heard of a rear tray?????

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f

Then a sensor is dirty with paper dust, yes paper has dust! Check the cover that opens on ADF. and also check the under the ADF. along the white strip that covers the small glass area. Also check the acturator that hangs down and goes up when the paper is placed in the document feeder (ADF) normally it should be handing down

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f

try this

Paper jams - Kodak Printers

Try this fix. It is shown on a similar model Epson workforce 630. Best of luck to you!
Paper jam in printer:

Paper jam in Automatic Document feeder or ADF:

Hello, Brittany.

Give this a try (from HP Support):

Complete the following steps to check the condition of the paper, reload the original, and then open and close the Automatic Document Feeder cover.

The main reason for this issue is that the ADF rollers that pick up the papers might not grip the paper because dirt sticks to the rollers.

Step One: Check the paper and reload the original
The condition of the paper, or the amount of paper, might prevent the ADF from picking it up and feeding it through the product.

1. Make sure that the ADF tray contains fewer than 25 sheets of paper.
2. Make sure that the ADF tray contains no photo paper or carbon paper.
3. Make sure the paper in the ADF tray meets the following criteria:
* No curls, folds, creases, or tears
* No staples or clips attached
NOTE: Folded paper, torn paper, or paper with rough edges might not feed correctly. If your original is folded or damaged, either reprint the original or try to smooth out the damaged portions.
4. Reload your original, with the print side up, into the ADF tray. Place the pages so that the top edge of the document goes in first. Slide the paper into the ADF tray until you hear a beep or see a message on the display indicating that the loaded pages are detected.

* If still a problem, go to the next step.

Step Two: Open and close the ADF cover
NOTE: Remove all originals from the ADF tray before you open the ADF cover.

1. Open the ADF cover, and then close it again.
2. Press the OK button.

* If still a problem, go to the next step.

Follow these steps to turn the product off and then on again.

1. Press the Power button to turn off the product.
2. Wait 15 seconds.
3. Press the Power button to turn on the product.

Hope this helps.

You should be able to. It sounds like you've got a paper jam in the document feeder. Chances are there was a jam and part of the document (a small peice perhaps) is still lodged in the document feeder unit.

Open the adf and rotate the pick assembly till you hear a click and then take a coin and run it up and down against the separator pad and then see if the adf picks the paper or not.If this does not work try this *# 329 and scroll thru and select adf pick test if that fails its time for you to get the printer replaced or get an upgraded printer