Blank paper comes out

No make/model, so here's a generic method:
[based on Samsung Multi-function]

Presuming printer is a MF unit:
Place paper-to-copy face down on the flatbed glass.
Close lid.
Ensure blank paper is correctly loaded in feeder tray.
For a once-off direct 'photocopy':
Press COPY on printer .

For copying (scanning) to a file:
Printer on, drivers installed, blank paper loaded, original on flatbed.
At computer, go to Start.
In search-box type in scan
Left-click magnifying glass to confirm search.
You should see Scan a document or picture appear in icon list.
Click this.
A scanning window should pop up:

Replace black cartridge., its clogged/dried.

Hello, try this:
Place a blank sheet of paper in the printer.
Turn on the printer, and you can see the alingning page.
Put that page in the scanner and press the key SCAN.
Although it has already done, some printers will lose the registration and request a new alignment.

old printer not really worth fixing

Instructions

1. Check the display for an error message. If the display reads "Clearing paper from printer," the engine has detected a jam and is attempting to eject the jammed pages automatically. These pages will often be blank.
   
2. Check the display for "Performing PRINT/STOP TEST" or "Performing SERVICE TEST." Either of these messages indicates that the printer is going through a test procedure that may eject blank pages.
   
3. Reduce the amount of paper in the input tray if the printer is feeding multiple blank sheets at a time. The printer will pull extra pages through if the input tray is overfilled.
   
4. Replace the paper in the input tray with the correct size if needed. If the 4600 printer detects the paper as an incorrect size for the print job, it may eject the paper without printing anything on it.
   
5. Replace the ink cartridges if certain colors are blank on the page. Replace the black cartridge if printing a black text document that is coming out blank. The printer may attempt to print even if the ink level is low or empty, but will unable to print anything on the page, causing it to come out blank.
   
6. Remove the sealing tape from newly installed cartridges. The tape covers the print heads and should be removed before installing the cartridges. If the tape is left on, it will prevent ink from getting on the pages as they print.
   
7. Press the "Check mark" button on the control panel to enter the printer menu. Run a diagnostic so the printer can attempt to determine the cause of the blank pages printing. Press the up or down arrow to select "Diagnostics." Press the "Check mark" button. Press the "Down" arrow to highlight "PQ Troubleshooting." Press the "Check mark" button. The printer runs a diagnostic and returns to a ready state when done.
   

1-There is a plastic knob that press the laser unit's shutter at the front door check and make sure that it is OK .
2-there are some earthing wire, at left side that connect with toner,some time these wires pressed down and not connected with toner and the print comes blank.

will

As a learner I forgot to click PRINT. I am 89. It takes time. Thanks anyway

by a different printer, it is the paper sensor and too expensive to fix

mac,

please press menu then start black copy (blue button) then fortimes arrow-up (tel.index). machine will switch to maintenance mode and all buttons will flash. press 8 then zero then severaltimes start black copy until error A1
will appear on the lcd. repeat pressing menu nine times and write down the error codes. Plz post them here again.
To leave the mode press stop then 9 then 9.