How do I reverse print on Toshiba Computer all in one

in your printer, Click the MENU Button, the INK- CLEANING then ALL then START. try this for 5 times cleaning or more, then try Test Print.

needs replacement the ink observer

Black is very difficult for an ink jet printer. If you are using the wrong paper, it even is more difficult. Please use paper made for ink jet printers, because the paper can absorb the fluid better so the pigment is more visible. There are also different ink's you can buy, but please if it really should be black, only use the brand own ink. Not a cheaper version. Professional printers even use different blacks for photo paper and for matte paper (and ink jet paper). Just to microbe how difficult it is to get real dark black on different media.

Check the green paper-size end guide inside the paper tray, it may be too far forward. There's a mark for letter-size paper (LTR) and I have my guide set right at the mark even though it seems it ought to be shorter. Be sure your paper is back up against the mark. You might also buy some different paper and see if that's the problem. Sometimes cheap paper will not feed right (I use Staples copy paper in my ink jet and laser printers).

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Print a "test" page, to prove that the RED ink-cartridge is not empty.

Run a few "print-head-cleaning" cycles, to make sure that the ink-jets that spray RED onto the paper are not clogged.

The problem is either:

* out of BLACK ink -- replace the ink-cartridge

* clogged ink-jets -- the ink is not spraying onto the paper, so run a few print-head-cleaning cycles

* dead electronics -- not triggering the jets to spray ink, so replace the printer

Run a "print-head-cleaning" cycle, because the ink-jets that shoot the black ink onto the paper are CLOGGED.

Your print-heads, which take the ink, and spray it onto the paper, have become "clogged". Run a "print-head-cleaning-cycle" to try to unclog those jets.

This might help. I did the same thing with my laserjet printer.
Staples has laserjet cleaning sheets. I ran several sheets through the printer after I pulled most of the transfer paper out.
The sheets are one use sheets so, you will need a few.They are impregnated with cleaning fluid on textured paper.
These sheets clean the entire paper travel path.