Hacking cartridge HP 84/85

Powder and inkjet printing
MAsic12345
Posts: 115
Joined: Sat Aug 25, 2018 5:26 pm
Location: Poland

Re: Hacking cartridge HP 84/85

Post by MAsic12345 »

Looks cool don't forget when testing about load limitation 1 amp
if it is not possible, then the head will last 3 seconds then it will burn

MAsic12345
Posts: 115
Joined: Sat Aug 25, 2018 5:26 pm
Location: Poland

Re: Hacking cartridge HP 84/85

Post by MAsic12345 »

Pleasant viewing


myying
Posts: 12
Joined: Mon Dec 16, 2019 10:16 am
Location: Taipei

Re: Hacking cartridge HP 84/85

Post by myying »

Hi
A HP applied patent US 20050088473A1 mentioned the ink drop weight relation with temperature.
The fire duration and supplied voltage are “not” both fixed data for HP pen(HP like use it.)
HP has a named TTOE(thermal turn on energy) calibration technology which lists in US5418558、 US5428376、US5428376…and so on.

There is output pin TSR(thermal sensing resistor) in HP pen which measures pen temperature. and also there is a circumstance-temperature sensor at PCB, then a complicated calculation, maybe storing embedded chip or burned as ID at factory. Once the ink was replaced another HP owned, it would be a new setting.

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