How to Identify Epson DX7 Printhead is Locked or Unlocked

As one of the most popular Epson printheads, Epson DX7 is virtually an alternative for DX5. But It’s widely used by textile printers because most of them are water-based printhead. Unlike Epson DX5 mostly are oil-based printhead.

Locked Printhead (the same story as Epson DX5)
Epson DX7 printheads work pretty well on the digital printing market for a long time with affordable price and reliable performance. But things changed in 2014, Epson altered the DX7 printheads and introduced a secure algorithm that caused DX7 work wrong when removed from desktop printers, like poor printing performance with missing or additional lines ruining the print, even can’t print at all. And Epson DX7 printheads also have 1st encrypted and 2nd encrypted.


How to tell the difference?
With both locked and unlocked on the market, you need an unlocked DX7 head for large format use, and you need to know the difference between the two.

There is a simple way that is through the serial number of the board.
This is an 8-digit number and the first three are important. The first two numbers are the production year, the third is the month. For example, the first three of a serial number are 136, that would be manufactured in June 2013.


What you need is to find a serial number that starts with 144 or higher, which means produced in April 2014 or later. Any head with that serial number is second locked heads that cannot be unlocked at present.

Click here for more about how to identify Epson DX5 head is locked or unlocked.

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