12/6/2020 Epson Piezo Hack
So in order to emulate the ink cartridges, I need to know how they work first. https://linxintensive551.weebly.com/tvs-rp-3160-thermal-printer-driver-for-win7.html. Luckily the ink cartridges in my printer have simple EEPROMs that hold the ink usage and other important information about the ink cartridge such as the expiration date, colour, serial number and so on.
Inside the print head, there is a circuit board with pads mapped out that are an exact mirror of the pads on the ink cartridges and a ribbon cable that connects this board up to the main board on pins 1 to 6. A quick look at the schematic for the main board reveals that pins 1 – 6 are named CVDD, CSDA, CRST, GND, CSCK and COI. https://linxintensive551.weebly.com/hp-nc8430-fingerprint-software.html. With these signal names I decided it would be best to draw out a schematic of the connecting board as it was not present in the service manual. This revealed that CSDA, CSCK, CRST have 100KOhm Pull-Down resistors, a bit unusual in my opinion as it’s not like I2C (uses Pull-Up Resistors typically 1.8KOhms to 47KOhms). The COI signal connects serially to the ink cartridges but on the end is shorted to GND. Curiously I tested the continuity of the pads on the ink cartridges and found that they are shorted, this means that when COI is grounded, all ink cartridges are present. Epson Piezo Hackett
Install mysql module php windows xp. The company developed the Micro Piezo inkjet technology, which used a piezoelectric crystal in each nozzle and did not heat the ink at the print head while spraying the ink onto the page, and released Epson MJ-500 inkjet printer (Epson Stylus 800 cartridge) in March 1993. Shortly after in 1994, Epson released the first high resolution color. In the Epson Micro Piezo print head, microscopic piezoelectric elements (like crystals and ceramics) are built behind the print nozzles. When an electrical charge is applied to them, these elements bend backward, forcing precise amounts of ink onto the substrate (see Diagram 1). Canon eos 40d reviews.
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