I CLEANED THE TYPE WHEELS OFF,NOW IT ONLY PRINTS DASHES

That will be a driver problem I think. You need to check the drivers are installed and correct.

by dragging the black bar on the left with your mouse when
the cursor changes for resize

Will the wheels move (be driven) if they are off the ground? Will the bar engage if the engine is not running? .. What type mower, what brand, direct drive, chain drive,?? . try this, reply on here ..

If you type in the serial number and use the dashes (hyphens) and you get an error, try typing it in without the dashes.

heater unit roller. If roller became old or stitch toner on it, something small scratches. Check it for replacement.

First your white horizontal lines are due to you not printing in the best quality. Go into the printing preferences and change the quality to best/quality.

The dots printed vertically are possibly due to ink getting onto the star wheels on the doc exit rollers. Also its possible that the printing media is a bit on the thin side and may need to be supported when exiting the machine.

Those should solve your problem. A new printhead wont make any difference.

Good luck

Well it should do it by itself,but if not then when your typing in the number ,switch to symbol mode by using the star key..then you can add your dashes

dialtone should go on the green and red wires of the jack for 1 line service, yellow and black for a second line.
Depending on the type of wiring that your dealing with the color code can change. if your wiring has white wires with little dashes of color on them then the code is:
green = white/blue (mostly white with blue dashes)
red = blue/white (mostly blue with white dashes)
black= white/orange (mostly white with orange dashes)
yellow= orange/white (mostly orange with white dashes)

try aligning the print heads before cleaning them

Hi , good day , try to do head cleaning until the black print will appear perfect in color.