Hai my printer epson lq 300 + printing issue zigzag kindly solve this issue

This is a feature provided by the manufacture to protect the print head overheat for small dot matrix printers. Here giving printer head connection diagram, the last two row have temperature sensing (thermister) connection pin 1 to 1. If the thermister is faulty in the print head the printer will auto pause abnormally. Check the printer with compatible / EPSON recommended print head. These kind of small printer only for POS printing not for continues printing.

Epson LQ 300 does not have Win7 latest driver. Please use your old PC (xp or visita) to continue with the Epson.

windows xp already has driver for that
go to start, setting-printer and faxes- click add a printer
add wizard printer box will apear
click next
set yo local printer uncheck automativaly detect
click next the use following port lpt1
next again
then search epson and the printer model
then click next and next set print test page then next and finnish..
the driver will install..

this is a case of mechanical error. check if something is blocking the movement of the printhead during initialization. try also to put a little lubricant oil on the carriage rail (stainless metal where the printhead is installed. you should see it when you lift up the top cover of the printer) also try to change the ribbon. if all these methods doesnt solve the problem then i suggest you bring your unit to an authorized service provider and have them take a look at the internal components.

change logic card

If the dot matrix printer does not have a built-in network card then it will not have a MAC address. Dot matrix printers are very old printers and I have not come accros any with built-in network card or print servers.
The dot matrix can be connected to a network print server and this will have a MAC address and a configurable IP address.

I recal a dipswitch story from long ago
Manual here:
http://www.retrevo.com/support/Epson-LQ-300-Printers-manual/id/259dj882/t/2/

Or try Epson itself.
It thin you can only switch from unidirectionalal to bidirectional
(last printing on cariage return also, doubling speed). If she is not already in this mode.

http://www.extraknowledge.org/forum/viewtopic.php?t=635&start=0&postdays=0&postorder=asc&highlight=

click the link.
if the link does not helps then go try this
More:
Go to www.linuxprinting.org

the Epson LQ-300 is in the list of supported
printers.

Links and discussion of all linux printing.

restart both system and printer will solve the problem.