1 exposed track line
The most likely is no toner. Remove the toner cartridge, shake it slightly to the right, and then put it into the printer. If the printing effect is obviously improved, it means that there is not much toner in the cartridge. If you confirm that the toner is full, there will be a white track, and the problem will be serious. Replace the toner cartridge.
2. Lost content when printing consecutively
The front page of the file can be printed normally, but the back page will lose content or the text will appear black or even black or white, but the page print will be normal. This is because the amount of page description information in the file is relatively complex, resulting in insufficient printer memory. The resolution of the printer can be reduced by one step to implement printing. The best solution, of course, is to add printer memory.
3. Toner smears appear on the print surface
î—¥ î—¥ Wipe the paper path inside the printer with a dry, clean, soft cloth to remove any toner left in the paper path; print a three-page document with only one word per page to clean the internal parts of the printer; select high-quality printing paper; If there is still a problem, you may need to replace the toner cartridge or the toner cartridge.
4 print garbled
Printer self-test to determine whether the printer itself has a hardware failure; detect the printer's cable and connection (in the DOS command state, enter a directory with a few files, type "dir>prn" and enter); Print a test page below to determine if the printer driver is installed correctly; check the application itself for problems.
5 can not print after replacing the motherboard or computer
  May be the wrong type of parallel port settings, you need to switch between the standard print port and ECP print port. Can be changed in the BIOS settings, or in "Control Panel" → "System" → "Device Management" → "Port" → "Printer Port" → "Properties" → "Driver" → "Change Driver" → " "Display all devices", interchange "ECP Print Port" and "Printer Port".