Dotted spaces are visible everytime i

LX 300 first came out in the 90's. If the ribbon cartridge was changed, and if the ribbon has adequate ink, then sad to say your 9 pin printer head is worn out. will need replacing.

Here is how:
1. Printer should be turned on, but not printing
2. Hold down PAUSE button for 3 seconds. The pause light will flash and the 2 tear off (FONT) lights shows the current font selected
3. Press Tear off(FONT) button to cycle thru fonts till light indicate the font you want. When you select the font needed it stays in use as default till you change it.

Note: Some software can change the printer font selected.

If need more information about your printer check the manual

How many prints have been down on the unit?
the most common problem could be the rollers need replacing or a problem with the ribbon sensor. We do repairs and also repair under warranty, How old is your printer?

thanks

You have to call the service, because developer is broken. The Toner cartridge is ok. Don't buy another one. The service tecnician updates the Firmware and replace the black developer.

u change the printer software, then u check.

Set your print driver to "Do Nothing" on Head Close and Power Up. the next time you print will pass this information to the printer and the problem will not come back - actually the default for the driver is "Do Nothing" so it has probably been changed for some reason, you will need to change it back.

I changed the print head, and the issue was solved.

Try changing setup from thermal transfer to direct thermal

Is the ribbon tight or sticking, If ribbon can't turn, it delays entire carriage, you will notice that if you move carriage up and down by hand ribbon turns, I have seen sticky ribbon s cause problems as well as gearing that drives ribbon with wornout gears

If self test fails then all faults /i can think of on these is

• Dry rail/dirty bearing
• incorrectly manufactured ribbon
• Damaged dot head
• broken/breaking ribbon interface carriage cable
• worn ribbon drive gears
• worn/dirty ribbon drive rail
• main board

see may be it is your printer head problem see if you can remove the head and see may be ther is one or two pins are not working . bye