Bixolon srp-350 thermal printer is working properly but its is black printing. as I can say that nothing is printing on the reciept. blank paper is coming out on every transcation.

SOURCE: PROBLEMS PRINTING

Hi Anabel,
I've heard of this kinds of issue in cases where an adaptor cable (usb-serial, usb-parallel) causes this. But if this isnt you perhaps you can try reloading the printer's newest driver.

SOURCE: Linux drivers for Samsung SRP 350 Plus Thermal Printer

This was originally a Samsung printer, and they had plans to release a Linux driver. However after some corporate games it's now owned by Bixolon, and everything Linux has been axed.

SOURCE: how to replace toner cartridge in srp-350 thermal

If it's a thermal printer, it doesn't use toner, just thermal printer paper (Like fax paper), It's a paper that turns black on heat contact. It doesn't require any ink.

SOURCE: My Printer Bixolon SRP-270 USB/Parallel stop

I'm sure it is the converter cable that is casuing this issue. Definitely try to change the interface on the printer to the native communication type. So if you have a parallel printer and you dont have a parallel port, you'll want to change the interface on the printer to usb. Bixolon printers have this ability. it'll cost around 30-40 bucks probaably with shipping

SOURCE: how to install a bixolon srp-275 network printer?

each printer manufacturer has their own ethernet configuration option for their products. Look it up on their website's FAQ if not helpful contact their tech support.