Hacking the HP45

Powder and inkjet printing
Wonko
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Joined: Sat Aug 15, 2015 8:13 pm

Re: Hacking the HP45

Post by Wonko »

Looking great! You managed to squeeze things close together very nicely. I hope it'll work.

It's a longer drive (Düsseldorf), but I can offer you to use my pick'n'place and my oven if you plan to make more than one PCB.
math
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Joined: Tue May 24, 2016 1:08 am

Re: Hacking the HP45

Post by math »

How about STMicroelectronics L6452. this seem to drive alone the hp45. Problem: minimum quantity at digikey are 396
math
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Re: Hacking the HP45

Post by math »

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dragonator
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Re: Hacking the HP45

Post by dragonator »

Mouser sells them per 1 and has them in stock.

This is the most curious chip I have ever seen. It really seems to be a full inkjet printhead driver chip. It has too few addresses for the HP45, but it is designed for 2 heads, so perhaps the remainder of the addresses can be taken from the other halve of the inkjet driver. It has check circuitry, it has thermal sense, it has different power levels, it runs on 12V. It seems to be really neat.

I will plow through the documentation the coming few days and see if it can work, but thus far it seems really interesting. Thank you very much for this chip.
EngieR
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Joined: Wed May 18, 2016 11:13 am

Re: Hacking the HP45

Post by EngieR »

I actually have an old printer that uses a HP45 cartridge and there a 1821-2207REV5.1 chip is used, might be helpful...
math
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Re: Hacking the HP45

Post by math »

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 pins from L6452 to 1826-4353.
If things come as expected, L6452 can simplify driving HP45.
Attachments
1826-4353 Pinout.PNG
1826-4353 Pinout.PNG (32.2 KiB) Viewed 16360 times
Deskjet 930c Placa Anotada Super Reduzida.png
Deskjet 930c Placa Anotada Super Reduzida.png (95.5 KiB) Viewed 16360 times
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dragonator
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Re: Hacking the HP45

Post by dragonator »

No pretty schematics today, but a plan for the foreseeable future.

I ordered parts today from several sources. I ordered:
  • L6452 chips
  • TLC59213 (SMD)
  • MIC5891 (SMD and DIP)
  • LM311 (SMD)
  • SIRA whatever mosfet (SMD)
  • parallel SRAM (DIP)
  • additional pogo pins
  • PQFP100 adapter (hard to find)
  • And somewhat unrelated, a 4x20 lcd, black background with green letters, for the Oasis printer, because it is pretty. Just look at it
Those who know all those chips will see that this gives a mixed message. Will I be using the PCB I have been designing until I found out about the L6452 or will I be using the L6452 itself. The answer for now is both. I admit that the L6452 is better if I can get it to work, but it also gives me slightly less control and I still need to test it. Also I need additional electronics to get it to work with parallel RAM memory, something I have been planning on using for quite a while now. With parallel RAM, the data can completely bypass the microcontroller during printing. I will most likely make a prototype board controller for the current design. This prototype board controller will drive the Oasis printer I am currently designing. I am not saying that a RAM buffer directly connected to a controller is the best idea, but it is an idea that I can do with my current skill. When I have the HP45 stable, I will worry about further improving electronics and firmware. As engineers say, first make it work, then make it better.

This does not mean I will not use the L6452. I will also try to get the HP45 working with the L6452. If it does, I will probably design the final Oasis controller with the L6452, and not with my current inkjet controller.

This all really depends on how things go. If the current PCB design gives me trouble, I will go with the L6452 and vice versa, but this is how I plan on running this project for the forseeable future.
Philipp
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Joined: Sat Mar 12, 2016 10:55 am

Re: Hacking the HP45

Post by Philipp »

Hello,
the L6452 could indeed significantly reduce the PCB. But you will probably need two L6452 to drive a HP45, right?
Philipp
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dragonator
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Re: Hacking the HP45

Post by dragonator »

Not at all, The L6452 has the electronics for 13x16 for 2 heads. This is 16 power lines and 2x13 address lines. By using address lines for both of the 'printheads', a single HP45 can be controlled with pins to spare.
Philipp
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Re: Hacking the HP45

Post by Philipp »

Hello,
are you sure? I understand that it can not operate at the same time the two printheads. Whatever that means.
It would be great if it works. I look forward to your results.

Philipp
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