Search found 31 matches

by math
Sat Apr 28, 2018 5:13 pm
Forum: 3DP printing
Topic: Info for Epson Precision core printhead
Replies: 11
Views: 53263

Re: Info for Epson Precision core printhead

Why not try with an inexpensive epson printhead used in home consumer printer ?
by math
Sun Feb 11, 2018 5:08 pm
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 749
Views: 2890859

Re: Hacking the HP45

I would like to share this document from HP that specifies cartridges that has and cartridges that don't have active electronics embedded.
http://h20195.www2.hp.com/v2/GetDocumen ... rica&lc=en
by math
Thu Jul 06, 2017 1:05 am
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 749
Views: 2890859

Re: Hacking the HP45

@davidk

Can you give me some information about this card in the picture?
by math
Sat May 20, 2017 8:43 pm
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 749
Views: 2890859

Re: Hacking the HP45

My hipotese is that L6452 is an 8-digit chip. We only have to discover the related pins. So, schematic diagram of C8855M is a great point of start. Are the 8 digit chips available at all and are there any datasheets available? I have yet to find anything about the chips. It is of little use consider...
by math
Sat May 20, 2017 7:56 pm
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 749
Views: 2890859

Re: Hacking the HP45

This is also an 100 pins chip. BTW, do you have the C8855M schematic diagram? I think that Vboost in L6452 is like fire voltage regulator in 1821-5613 (1826-4355, 1825--0057). I bet in this hipotese because are both from ST and directed to control related devices
david wrote: It is 1825-0057.
by math
Sat May 20, 2017 6:57 pm
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 749
Views: 2890859

Re: Hacking the HP45

1826-4353 has only 80 pins . Original chip number is 1821-5613 an has 100 pins. I have a card from an old printer (hp 930c) with two chips (1826-4353 and 1826-4355) and I checked the 1826-4355, with 100 pins, against schematic diagram of C88555M, that seems to be exactly same of the 1821-5613 can an...
by math
Wed Jun 15, 2016 11:32 pm
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 749
Views: 2890859

Re: Hacking the HP45

Examining the fig. 1 and the related explanation posted by DigitalShadow on page 5, seem to me that R10X is used only for determine the resistence of heater resistors. Resistence changes with temperature. It's measured the resistence of R10X that are under same temperature of heater resistors. For e...
by math
Sun Jun 12, 2016 8:00 pm
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 749
Views: 2890859

Re: Hacking the HP45

From the datasheet of L6452 seem to me that R10x is used to receive a external current to all nozzle resistors that is provided by the L6452 and is adjusted by an external resistor at pin 93 (Rext) of L6452. This would be used in conjunction with the Rterm of printhead to control the correct tempera...
by math
Wed May 25, 2016 12:13 am
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 749
Views: 2890859

Re: Hacking the HP45

dragonator, Your work is amazing! Thank you very much!. Turning to the L6452, I also have a printhead card from deskjet 930c that show a CI (named 1826-4353) like this. It has only 80 pins while L6452 has 100 pins. I didn't get any return information about it in ST or internet. I'm trying to relate ...
by math
Tue May 24, 2016 1:21 am
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 749
Views: 2890859

Re: Hacking the HP45