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Digital photo printer RFID identifying

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Tomislav Koren

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Hello all,

I hope somenone reads this and can help.

I have digital photo printer, DNP RX-1. Printer uses thermal ribbons which are specifically tailored by number of
prints. This number is stored in RFID chip in ribbon axle, and every time printer drops a print, counter in ribbon drops another value.
Recently, I bought plenty of ribbons that were half used and their RFID axle is missing. So I thought that I can glue that leftover to used axle and continue my work. I was wrong because printer reads print count from RFID and adjusts angular velocity during print to maintain constant transfer speed. Used ribbon has larger diameter than unused ant therefor has to unwind slower.
However, when I attached half used ribbon to new axle with fresh RFID, everything worked fine.
Therefor I got a clue that somehow I must find my way to read RFID and rewrite it to full.

Since I cannot find nothing about that specific printer, I searched by RFID size, diameter and number of circles, and assumed that it can be 13,56 MHz RFID since 125kHz are usually read-only. I know my RFID is read and write version because every ribbon has different value and I don't believe printer has internal memory for counter that sorts by serial number of RFID.

I bought Mifare 13,56 MHz usb reader writer from ebay but it doesn't read my RFID. I does work because it reads my bank card (with security error, warning) but I know it works - at least.

So now I'm stuck and wondering whether someone can help me with that.

I'm attaching RFID scans so you can see and maybe identify it.

Rfid.jpgRfid_01.jpg
 

AG-1

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Mifare operate, with the ISO 14443 standard, at 13.56 MHz , other standard also operate at 13.56 MHz:
ISO 15693
Legic
FeliCa

Regards!

I bought Mifare 13,56 MHz usb reader writer from ebay but it doesn't read my RFID. I does work because it reads my bank card (with security error, warning) but I know it works - at least.
 

FvM

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To narrow down the used RFID protocol, you can pick up the reader signal with a wire loop connected to an oscilloscope.
 

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